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Hi Kevin,

In XY mode a vertical signal is not really needed but it looks nicer. Simply defocus the spot and set it to a convenient brightness. The idea is that you can watch DC voltages now with your DMM while you slowly rotate Hor Pos from fully counter clockwise to fully clockwise and back. You might find for instance that the first stage (test points 85 and 86) follows the Hor Pos knob position smoothly over the whole range from 2.1 V to 4.1 V, while the second stage fails. It might be normal that the Hor Pos even goes slightly beyond these extremes of the sweep.

Albert

---In TekScopes@..., <kcrossett@...> wrote :

Hi Albert. Appreciate the advice. I have checked the XY mode, but only with
no signal. The dot near the middle does move slightly, but only about a
half-an-inch or so. I don't have any way locally to create a triangular
wave form, and I don't have, or know anyone, with a second scope to use for
testing. I hope I don't need to desolder any of the transistors to check
them out. That would require some extensive disassembly, as far as I can
tell from looking at the physical component locations.

Ah. I think I understand. Do I need to inject a signal, say from a small
signal generator that outputs a dirty square wave, or can I do it simply by
turning on the scope, defocusing the spot and manipulating the horz control
while measuring the voltage on the two test points?

On Fri, Dec 5, 2014 at 3:34 PM, aodiversen@... [TekScopes] <
TekScopes@...> wrote:

Hi Kevin,

In XY mode a vertical signal is not really needed but it looks nicer.
Simply defocus the spot and set it to a convenient brightness. The idea is
that you can watch DC voltages now with your DMM while you slowly rotate
Hor Pos from fully counter clockwise to fully clockwise and back. You might
find for instance that the first stage (test points 85 and 86) follows the
Hor Pos knob position smoothly over the whole range from 2.1 V to 4.1 V,
while the second stage fails. It might be normal that the Hor Pos even goes
slightly beyond these extremes of the sweep.

Albert

---In TekScopes@..., <kcrossett@...> wrote :

Hi Albert. Appreciate the advice. I have checked the XY mode, but only
with
no signal. The dot near the middle does move slightly, but only about a
half-an-inch or so. I don't have any way locally to create a triangular
wave form, and I don't have, or know anyone, with a second scope to use
for
testing. I hope I don't need to desolder any of the transistors to check
them out. That would require some extensive disassembly, as far as I can
tell from looking at the physical component locations.

[Non-text portions of this message have been removed]

Yes simply set both channels to GND and defocus the spot. That way you won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a small
signal generator that outputs a dirty square wave, or can I do it simply by
turning on the scope, defocusing the spot and manipulating the horz control
while measuring the voltage on the two test points?

Great I'll try that tonight. Thanks for the tip. I'll also check voltages
on the other test points and check the wires to the deflection plates and
check the wires and clips to the CRT.

I'll report back my results.

On Fri, Dec 5, 2014 at 4:11 PM, aodiversen@... [TekScopes] <
TekScopes@...> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a small
signal generator that outputs a dirty square wave, or can I do it simply
by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

OK. So I made the measurements on the test points as directed by Albert. I
have not checked the transistors because I'm still not sure the best way to
do so. I also checked the wires to the deflector plates, and they seem to
be secure.

Here are the measurements based on the following criteria. Scope in XY and
both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in the
manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and 90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... [TekScopes] <
TekScopes@...> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a small
signal generator that outputs a dirty square wave, or can I do it simply
by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Hi Kevin,
set up controls just as Albert suggested. gnd both channels, defocus, and low intensity.
now measure the voltage at TP 85 and adjust the horizontal position on the front panel until you read 3.1v as shown ins the schematic.

now WITHOUT moving the horz position any more…..remeasure the other TP’s.

post these readings.

thanks
jim

Done. Here are the results

TP VDC
85 3.1
86 3.18
87 -3.03
88 -2.81
89 36.33
90 36.11

On Fri, Dec 5, 2014 at 7:42 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

Hi Kevin,
set up controls just as Albert suggested. gnd both channels, defocus, and
low intensity.
now measure the voltage at TP 85 and adjust the horizontal position on the
front panel until you read 3.1v as shown ins the schematic.

now WITHOUT moving the horz position any more…..remeasure the other TP’s.

post these readings.

thanks
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by Albert.

I

have not checked the transistors because I'm still not sure the best way

to

do so. I also checked the wires to the deflector plates, and they seem to
be secure.

Here are the measurements based on the following criteria. Scope in XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in the
manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and 90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

one other thought…. push in the X10 mag button and see if your original symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by Albert. I
have not checked the transistors because I'm still not sure the best way to
do so. I also checked the wires to the deflector plates, and they seem to
be secure.

Here are the measurements based on the following criteria. Scope in XY and
both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in the
manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and 90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:aodiversen@...> [TekScopes] <
TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a small
signal generator that outputs a dirty square wave, or can I do it simply
by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by Albert.

I

have not checked the transistors because I'm still not sure the best way

to

do so. I also checked the wires to the deflector plates, and they seem to
be secure.

Here are the measurements based on the following criteria. Scope in XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in the
manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and 90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

find vr4341, a zener diode. measure both sides of it please

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...> [TekScopes] <
TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by Albert.

I

have not checked the transistors because I'm still not sure the best way

to

do so. I also checked the wires to the deflector plates, and they seem to
be secure.

Here are the measurements based on the following criteria. Scope in XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in the
manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and 90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

when you press the BEAM FINDER button ….does it have any effect on the display, if so what???

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...> [TekScopes] <
TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by Albert.

I

have not checked the transistors because I'm still not sure the best way

to

do so. I also checked the wires to the deflector plates, and they seem to
be secure.

Here are the measurements based on the following criteria. Scope in XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in the
manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and 90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way you
won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Interesting VR4341 has some blackened materials on each of the leads. Not
sure if that is normal, but to the untrained eye, it looks like it might
have been toasted.

VR 4341 measurements
Cathode 110.6
Anode 108.6

On Fri, Dec 5, 2014 at 8:01 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

find vr4341, a zener diode. measure both sides of it please

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope in

XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way

you

won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

It just shifts the display slightly. Does in XY and in normal mode.

On Fri, Dec 5, 2014 at 8:08 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

when you press the BEAM FINDER button ….does it have any effect on the
display, if so what???

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope in

XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way

you

won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

there should be 6.2v difference across VR4341…. measure both sides of R4344…. on side should be 55v the other 103.8.

the blackish coating on the leads is silver oxide, not burned stuff…. a lot of zeners from these years have it…. usually diodes from Motorola and 贵补颈谤肠丑颈濒诲…..


jim

locate u4269 a dual in line pkg right next to the 85,86,87,88 test points….if it’s in a socket wiggle it…..

On Dec 5, 2014, at 8:11 PM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:

It just shifts the display slightly. Does in XY and in normal mode.

On Fri, Dec 5, 2014 at 8:08 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...> [TekScopes] <
TekScopes@... <mailto:TekScopes@...>> wrote:

when you press the BEAM FINDER button ….does it have any effect on the
display, if so what???

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope in

XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way

you

won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Oh. Thanks for the education...

On R4344
54.85 vdc
108.5vdc

On Fri, Dec 5, 2014 at 8:14 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

there should be 6.2v difference across VR4341…. measure both sides of
R4344…. on side should be 55v the other 103.8.

the blackish coating on the leads is silver oxide, not burned stuff…. a
lot of zeners from these years have it…. usually diodes from Motorola and
贵补颈谤肠丑颈濒诲…..

jim

On Dec 5, 2014, at 8:09 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Interesting VR4341 has some blackened materials on each of the leads. Not
sure if that is normal, but to the untrained eye, it looks like it might
have been toasted.

VR 4341 measurements
Cathode 110.6
Anode 108.6

On Fri, Dec 5, 2014 at 8:01 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

find vr4341, a zener diode. measure both sides of it please

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

<mailto:kcrossett@...>

[TekScopes] <TekScopes@... <mailto:

TekScopes@...>> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@...

<mailto:jpopwell@...> <mailto:

jpopwell@... <mailto:jpopwell@...>> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>

<mailto:TekScopes@... <mailto:TekScopes@...>>>
wrote:

one other thought…. push in the X10 mag button and see if your

original

symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

<mailto:kcrossett@...>

[TekScopes] <TekScopes@... <mailto:

TekScopes@...>> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the

best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope

in

XY

and

both channels set to GND. Defocused the beam and manipulated the

horz

control while reading voltages on the test points as identified

in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89

and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> <mailto:

aodiversen@... <mailto:aodiversen@...>>

[TekScopes] <

TekScopes@... <mailto:TekScopes@...>

<mailto:TekScopes@... <mailto:TekScopes@...>>>
wrote:

Yes simply set both channels to GND and defocus the spot. That

way

you

won't burn-in the screen.
Albert


---In TekScopes@... <mailto:

TekScopes@...>, <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say

from a

small

signal generator that outputs a dirty square wave, or can I do

it

simply

by
turning on the scope, defocusing the spot and manipulating the

horz

control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

back to the beam finder button a minute…..you said it just slightly shifts the display??? it should shrink it a good bit….. work this button in and out about 20 times……

any change?

On Dec 5, 2014, at 8:11 PM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:

It just shifts the display slightly. Does in XY and in normal mode.

On Fri, Dec 5, 2014 at 8:08 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...> [TekScopes] <
TekScopes@... <mailto:TekScopes@...>> wrote:

when you press the BEAM FINDER button ….does it have any effect on the
display, if so what???

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your original
symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope in

XY

and

both channels set to GND. Defocused the beam and manipulated the horz
control while reading voltages on the test points as identified in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89 and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

Yes simply set both channels to GND and defocus the spot. That way

you

won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say from a

small

signal generator that outputs a dirty square wave, or can I do it

simply

by
turning on the scope, defocusing the spot and manipulating the horz
control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Sorry, misunderstood the original email. When I hit the beam finder (after
working the button about 20 times) the beam grows from two divisions to
three divisions.

On Fri, Dec 5, 2014 at 8:20 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

back to the beam finder button a minute…..you said it just slightly shifts
the display??? it should shrink it a good bit….. work this button in and
out about 20 times……

any change?

On Dec 5, 2014, at 8:11 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

It just shifts the display slightly. Does in XY and in normal mode.

On Fri, Dec 5, 2014 at 8:08 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

when you press the BEAM FINDER button ….does it have any effect on the
display, if so what???

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@...

<mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your

original

symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the

best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope

in

XY

and

both channels set to GND. Defocused the beam and manipulated the

horz

control while reading voltages on the test points as identified

in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89

and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>>

wrote:

Yes simply set both channels to GND and defocus the spot. That

way

you

won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say

from a

small

signal generator that outputs a dirty square wave, or can I do

it

simply

by
turning on the scope, defocusing the spot and manipulating the

horz

control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

do you have any 6.2v zener diodes….or any spare npn 2n2222 2n3904….transistors…..

you can make a zener out of a spare NPN transistor emitter to base junction…..the base should be connected to the cathode point and the emitter connected where the anode is of the original zener…. this will give a “zener of about 6 to 7v to see if it affects the amps gain…..

jim

On Dec 5, 2014, at 8:19 PM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:

Oh. Thanks for the education...

On R4344
54.85 vdc
108.5vdc

On Fri, Dec 5, 2014 at 8:14 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...> [TekScopes] <
TekScopes@... <mailto:TekScopes@...>> wrote:

there should be 6.2v difference across VR4341…. measure both sides of
R4344…. on side should be 55v the other 103.8.

the blackish coating on the leads is silver oxide, not burned stuff…. a
lot of zeners from these years have it…. usually diodes from Motorola and
贵补颈谤肠丑颈濒诲…..

jim

On Dec 5, 2014, at 8:09 PM, Kevin Crossett kcrossett@... <mailto:kcrossett@...>

[TekScopes] <TekScopes@... <mailto:TekScopes@...>> wrote:

Interesting VR4341 has some blackened materials on each of the leads. Not
sure if that is normal, but to the untrained eye, it looks like it might
have been toasted.

VR 4341 measurements
Cathode 110.6
Anode 108.6

On Fri, Dec 5, 2014 at 8:01 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...> <mailto:

jpopwell@... <mailto:jpopwell@...>> [TekScopes] <

TekScopes@... <mailto:TekScopes@...> <mailto:TekScopes@... <mailto:TekScopes@...>>> wrote:

find vr4341, a zener diode. measure both sides of it please

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@... <mailto:kcrossett@...>

<mailto:kcrossett@... <mailto:kcrossett@...>>

[TekScopes] <TekScopes@... <mailto:TekScopes@...> <mailto:

TekScopes@... <mailto:TekScopes@...>>> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@... <mailto:jpopwell@...>

<mailto:jpopwell@... <mailto:jpopwell@...>> <mailto:

jpopwell@... <mailto:jpopwell@...> <mailto:jpopwell@... <mailto:jpopwell@...>>> [TekScopes] <

TekScopes@... <mailto:TekScopes@...> <mailto:TekScopes@... <mailto:TekScopes@...>>

<mailto:TekScopes@... <mailto:TekScopes@...> <mailto:TekScopes@... <mailto:TekScopes@...>>>>
wrote:

one other thought…. push in the X10 mag button and see if your

original

symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@... <mailto:kcrossett@...>

<mailto:kcrossett@... <mailto:kcrossett@...>>

[TekScopes] <TekScopes@... <mailto:TekScopes@...> <mailto:

TekScopes@... <mailto:TekScopes@...>>> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the

best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope

in

XY

and

both channels set to GND. Defocused the beam and manipulated the

horz

control while reading voltages on the test points as identified

in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89

and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:aodiversen@...> <mailto:

aodiversen@... <mailto:aodiversen@...>> <mailto:

aodiversen@... <mailto:aodiversen@...> <mailto:aodiversen@... <mailto:aodiversen@...>>>

[TekScopes] <

TekScopes@... <mailto:TekScopes@...> <mailto:TekScopes@... <mailto:TekScopes@...>>

<mailto:TekScopes@... <mailto:TekScopes@...> <mailto:TekScopes@... <mailto:TekScopes@...>>>>
wrote:

Yes simply set both channels to GND and defocus the spot. That

way

you

won't burn-in the screen.
Albert


---In TekScopes@... <mailto:TekScopes@...> <mailto:

TekScopes@... <mailto:TekScopes@...>>, <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say

from a

small

signal generator that outputs a dirty square wave, or can I do

it

simply

by
turning on the scope, defocusing the spot and manipulating the

horz

control
while measuring the voltage on the two test points?




[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Nope no sockets anywhere on this unit. I checked the u4269 and no luck.
Good news is that it isn't loose;)

On Fri, Dec 5, 2014 at 8:18 PM, Jim Popwell jpopwell@... [TekScopes] <
TekScopes@...> wrote:

locate u4269 a dual in line pkg right next to the 85,86,87,88 test
points….if it’s in a socket wiggle it…..

On Dec 5, 2014, at 8:11 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

It just shifts the display slightly. Does in XY and in normal mode.

On Fri, Dec 5, 2014 at 8:08 PM, Jim Popwell jpopwell@... <mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

when you press the BEAM FINDER button ….does it have any effect on the
display, if so what???

On Dec 5, 2014, at 7:58 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

Hi Jim. The symptoms do still exist when I press the 10x mag button.

On Fri, Dec 5, 2014 at 7:56 PM, Jim Popwell jpopwell@...

<mailto:

jpopwell@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>> wrote:

one other thought…. push in the X10 mag button and see if your

original

symptoms still exist…..
jim

On Dec 5, 2014, at 6:46 PM, Kevin Crossett kcrossett@...

[TekScopes] <TekScopes@...> wrote:

OK. So I made the measurements on the test points as directed by

Albert.

I

have not checked the transistors because I'm still not sure the

best

way

to

do so. I also checked the wires to the deflector plates, and they

seem to

be secure.

Here are the measurements based on the following criteria. Scope

in

XY

and

both channels set to GND. Defocused the beam and manipulated the

horz

control while reading voltages on the test points as identified

in

the

manual figure 9-7.

TP VDC
85 1.42 to 3.90
86 2.35 to 4.90
87 -1.46 to -4.19
88 -2.10 to -3.34
89 36.25 to 36.80
90 35.60 to 37.07

These seem a little wonky to me, especially test points 86, 89

and

90.

Any thoughts?

On Fri, Dec 5, 2014 at 1:11 PM, aodiversen@... <mailto:

aodiversen@...> [TekScopes] <

TekScopes@... <mailto:TekScopes@...>>

wrote:

Yes simply set both channels to GND and defocus the spot. That

way

you

won't burn-in the screen.
Albert


---In TekScopes@..., <kcrossett@...> wrote :

Ah. I think I understand. Do I need to inject a signal, say

from a

small

signal generator that outputs a dirty square wave, or can I do

it

simply

by
turning on the scope, defocusing the spot and manipulating the

horz

control
while measuring the voltage on the two test points?

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]