Would anyone with the secret code book know what comprises MOD WT on the 5440 mainframe?
Would anyone with access to the 'secret code book' know what comprises "MOD WT" on the 5440 mainframe (circa 1986)? I'm guessing one item might be the convenient IEC power entry.
Thanks in advance,
Don

trigger view did nothing.
but i had it on long enough that i noticed a smoking tantalum. and it was even moaning! ikyn it was making noise when it started to smoke. it was in a cluster of 3 tants on the large rightmost board (viewed from the front) towards the rear...i don't even know what board that is yet but i will as soon as i can get to look at the service manual.
phil

--- In TekScopes@..., "pdxareaid" <public_email@> wrote:

arggg...i fogot to poke the trigger view. one last trip out there right now.


--- In TekScopes@..., "Brad King" <cpgixxer@> wrote:

Trigger view as far as I know detaches the vertical pre from the circuit. The service manuals have block diagrams to help segregate the circuit to narrow it down.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: "pdxareaid" <public_email@>
Sender: TekScopes@...
Date: Sun, 23 Sep 2012 21:48:37
To: <TekScopes@...>
Reply-To: TekScopes@...
Subject: [TekScopes] Re: WooHoo! 465B

lol..i have not had time to do much of anything with it yet (only had it a couple of hours) but i can't resist dropping everything and running out to poke it with these tips rolling in...

when the screen is glowing, none of the controls seems to affect it and it generally lights up the whole screen.

using the beamfinder, i get a bright dot that jumps around and in and out of what looks like it might be trying to show me a reasonable beamfinder display, but severely shift off screen to the right.
the position controls seem to affect it but not in a consistent way...but there is some effect.
all of the beamfinder action appears to be on the right half of the screen.
phil

ps. i'm going to be in trouble if i don't finish some other stuff today...i'll leave poking it again til tomorrow but will check in to soak up the tips for when i do get out there.
thanks for all the help. keep em coming :-)




--- In TekScopes@..., "Brad King" <cpgixxer@> wrote:

The glow is because the trace isn't centered, could be a bad resistor or transistor in the vertical. Does it move h or v with the adjustment? Did you try pressing the trigger view button?
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: "pdxareaid" <public_email@>
Sender: TekScopes@...
Date: Sun, 23 Sep 2012 21:25:55
To: <TekScopes@...>
Reply-To: TekScopes@...
Subject: [TekScopes] Re: WooHoo! 465B


ah, the beamfinder...never was very fond of it. now maybe i see why it is there. thanks for the tip.

sweep rate does not seem to affect anything.

beamfinder:
I got the usual bright connected 2 (i assume) point display but severely shifted to the right such that only 1/2 of the expected display is on the screen.
curiously, when i tried that, and released the beamfinder, i got a bright point on the display rather than a full screen glow. then it went back to the glow.
i tried the beamfinder a few more times and it seemed to start bringing something back from the dead. i even saw it flash what looked like it might have been a reasonable trace...but it disappeared very quickly.
the burning smell was making me nervous so i shut it down.

are these useful clues?


--- In TekScopes@..., larrys@ wrote:

"pdxareaid" <public_email@> wrote:

Whole screen glows off and on, no trace to speak of.

Does the rate of the on / off vary with the sweep speed setting?
Sounds like you may have a trace, just offscreen. See if the
beamfinder shows it too you.

-ls-

"Now if only I could get the readout to reflect a 100x probe when doing tube
work!"

Is the 5000 series readout system different than the 7000?

On the 7000 series all you need to do is have 6.2K +- 5% of resistance
between the readout code ring around the BNC input and signal ground. I
have successfully made some BNC spring pin coded rings for my probes by
obtaining the outer ring part from a forum member here and then placing a
6.2K surface mount resistor on top of the spring for the pin. It works
great.

My struggle however has been to get a 1000x resistor value. Actually I can
get a 1000X with a 4.3K, 4.7K or so. However it will not add zeros so only
forces the readout to correct values for the mv range. So far I have not
figured out if either a "proper" resistance value is my problem or something
different s done for 1000x probes for the readout.

Anyway, try putting a 6.2K resistor from your scopes readout code ring to
ground and see if you get the 100X values showing. If you do than that
means the 5000 series readout is similar enough to the 7000 series that you
could build your own code collar like I did. Assuming that the 6.2K test
will be successful; a search in the old messages for "BNC collar" will lead
you to a discussion back around June 7th of this year that will help with
the rest.

If the 6.2K test fails..... well at least I tried to help * smile *.
Good luck
Rob

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
On Behalf Of Mike Czuhajewski
Sent: 24 September 2012 13:32
To: TekScopes@...
Subject: [TekScopes] Need specs for 015-0221-00 DC block

This is their BNC DC block. Finding any data on it is pretty much

tried lots of Google searches, old Tek catalogs, etc.
(It's listed under spectrum analyzer accessories.) About the only thing I

find is the voltage limit (50) and nothing more. They do give detailed

the type N block, though.

Does anyone have any actual data on this? I'm looking for the frequency
range, especially the low end. I've seen it mentioned a few times but with
different sets of frequencies; nothing agrees. Does anyone know the actual
Tek spec on these?

Thanks.



------------------------------------

Yahoo! Groups Links

Hi,
Voltage U460 pin3 and 9 is -8.6V, R456 is ok.
pin 1 and 8 are 3.5V not 2.2
pin 4 and 11 check out ok, 2 and 2.4V dependent on the slope setting.

u460 is unfortunately not on a socket.

To access u460 and area, i see i have to remove some components. I will start on that a.s.a.p. but a question: some loose contact in the timebase switch. sometimes it generates only half screen image when i move with that knob. is that the pot-meter in the middle?

T.



--- In TekScopes@..., David <davidwhess@> wrote:

U460 is not necessarily bad but if it is, the CA3102 transistor array
is not expensive or difficult to acquire. If U480 is bad, the 10102
ECL Quad 2-input NOR gate is readily available.

4 volts at both pin 10 of U480C and pin 7 of U480B is consistent with
a logical high for a 10102 when operated at PECL levels but one pin of
that pair should be low.

Check the voltage at pin 3 or 9 of U460. R456 might be open so check
its resistance.

Check pin 8 or 1 of U460 which should be 2.2 volts.

Check pin 11 or 4 of U460. It should be either 2.4 volts or 2.0 volts
depending on the trigger slope setting.

If U460 is socketted, then you could pull it and check the transistor
junctions with the diode test function on your multimeter.

On Mon, 24 Sep 2012 02:58:59 -0000, "tjeenz" <tjeenz@> wrote:

Hi David,

no square wave on the pins 10 and 7, both slopes.... it just measures a +4V dc, at both pins. Does it mean my U460 has died?

T.

--- In TekScopes@..., David <davidwhess@> wrote:

That narrows the problem down to some point at or after transistor
array U460. The good news is that the 2213 does not use a custom
trigger IC so if the problem can be found, it should be relatively
easy to fix.

With the trigger set to LINE and AUTO, adjust the LEVEL to midway and
measure pin 10 of U480C and pin 7 of U480B. With both SLOPE settings,
there should be at least a 300mV to 400mV square wave on each pin.

If there is, then check pin 2 of U480A. It should have a 300mV to
400mV square wave.

On Sun, 23 Sep 2012 10:51:11 -0000, "tjeenz" <tjeenz@> wrote:

Hi David, still out there?

back from trip...
I checked tp444:
with trig on "line" i have a sinus with about 0.5V tt

if i connect a 4V top-top sinus at ch1 with trig on "int" i have 150mV sinus on tp444 (very small)

U460B, pin 2:
norm: there is indeed a +0.65 - -0.65V which can be controlled by the trig-lev. pot.
auto: sinus 50 mV (again with 4V tt at ch1). which seems very small...

in all situations the display does not show a "still" image.

tjeenz


--- In TekScopes@..., "tjeenz" <tjeenz@> wrote:

hi David,
thx for the tip! i will check this as soon as possible (couple days out of town). i check tp444 before with ext. trigger and that was very small compared to the input signal. don't know the exact amplitude but much lower.
probably back on saturday. tjeenz.

--- In TekScopes@..., David <davidwhess@> wrote:

I would start by looking at TP444 (middle of schematic 4) which should
be a duplicate of the trigger input signal as selected by the source
and coupling controls. At the very least, there should be a 60Hz sine
wave at that point when the trigger source is set to line.

Then I would check pin 2 of U460B which should be a duplicate of the
tri.gger level voltage as set by the trigger level control. In Auto
mode this voltage will be between the peak levels of the trigger
signal but in normal mode, it should be between +0.65V and -0.65V.

It would be nice to have a nicer scan of the service manual. I
extracted and cleaned up schematic 4 from the one available online:



On Tue, 18 Sep 2012 11:00:41 -0000, "tjeenz" <tjeenz@> wrote:

Hi,
Have a trigger problem with a 2213 tektronix.

In auto and line trigger i have a baseline. In norm not. Also ext. trigger fails (signal from function generator 4v pp and ch1 on 1v/div)

cannot get still image to see frequency, amplitude is ok. with signal on one of the channels, trig in auto i can almost get still image if freq is low enough with var hold-off. trig-level does nothing. Also the trigger led never blinks.

Checked all p.s. voltages. Are ok (no ripples), but according to service manual there should be some specific resistance on the voltages. These are way too low in my scope:
8.6v 114 ohm at tp500= 58 ohm
+8.6v 95 ohm at W975 = 16 ohm
+5v 330 ohm at W985 = 16 ohm
+30v 905 ohm at W965 = 16 ohm
+100v 12.5 kohm at W966 = 16 ohm

so i guess something is wrong somewhere. checked the big capacitors in the p.s, for 30V and +8.6V, both were in spec.

Are these resistance values in the manual a good reference for finding the faulty area?

regards, tjeenz

U460 is not necessarily bad but if it is, the CA3102 transistor array
is not expensive or difficult to acquire. If U480 is bad, the 10102
ECL Quad 2-input NOR gate is readily available.

4 volts at both pin 10 of U480C and pin 7 of U480B is consistent with
a logical high for a 10102 when operated at PECL levels but one pin of
that pair should be low.

Check the voltage at pin 3 or 9 of U460. R456 might be open so check
its resistance.

Check pin 8 or 1 of U460 which should be 2.2 volts.

Check pin 11 or 4 of U460. It should be either 2.4 volts or 2.0 volts
depending on the trigger slope setting.

If U460 is socketted, then you could pull it and check the transistor
junctions with the diode test function on your multimeter.

On Mon, 24 Sep 2012 02:58:59 -0000, "tjeenz" <tjeenz@...> wrote:

Hi David,

no square wave on the pins 10 and 7, both slopes.... it just measures a +4V dc, at both pins. Does it mean my U460 has died?

T.

--- In TekScopes@..., David <davidwhess@> wrote:

That narrows the problem down to some point at or after transistor
array U460. The good news is that the 2213 does not use a custom
trigger IC so if the problem can be found, it should be relatively
easy to fix.

With the trigger set to LINE and AUTO, adjust the LEVEL to midway and
measure pin 10 of U480C and pin 7 of U480B. With both SLOPE settings,
there should be at least a 300mV to 400mV square wave on each pin.

If there is, then check pin 2 of U480A. It should have a 300mV to
400mV square wave.

On Sun, 23 Sep 2012 10:51:11 -0000, "tjeenz" <tjeenz@> wrote:

Hi David, still out there?

back from trip...
I checked tp444:
with trig on "line" i have a sinus with about 0.5V tt

if i connect a 4V top-top sinus at ch1 with trig on "int" i have 150mV sinus on tp444 (very small)

U460B, pin 2:
norm: there is indeed a +0.65 - -0.65V which can be controlled by the trig-lev. pot.
auto: sinus 50 mV (again with 4V tt at ch1). which seems very small...

in all situations the display does not show a "still" image.

tjeenz


--- In TekScopes@..., "tjeenz" <tjeenz@> wrote:

hi David,
thx for the tip! i will check this as soon as possible (couple days out of town). i check tp444 before with ext. trigger and that was very small compared to the input signal. don't know the exact amplitude but much lower.
probably back on saturday. tjeenz.

--- In TekScopes@..., David <davidwhess@> wrote:

I would start by looking at TP444 (middle of schematic 4) which should
be a duplicate of the trigger input signal as selected by the source
and coupling controls. At the very least, there should be a 60Hz sine
wave at that point when the trigger source is set to line.

Then I would check pin 2 of U460B which should be a duplicate of the
tri.gger level voltage as set by the trigger level control. In Auto
mode this voltage will be between the peak levels of the trigger
signal but in normal mode, it should be between +0.65V and -0.65V.

It would be nice to have a nicer scan of the service manual. I
extracted and cleaned up schematic 4 from the one available online:



On Tue, 18 Sep 2012 11:00:41 -0000, "tjeenz" <tjeenz@> wrote:

Hi,
Have a trigger problem with a 2213 tektronix.

In auto and line trigger i have a baseline. In norm not. Also ext. trigger fails (signal from function generator 4v pp and ch1 on 1v/div)

cannot get still image to see frequency, amplitude is ok. with signal on one of the channels, trig in auto i can almost get still image if freq is low enough with var hold-off. trig-level does nothing. Also the trigger led never blinks.

Checked all p.s. voltages. Are ok (no ripples), but according to service manual there should be some specific resistance on the voltages. These are way too low in my scope:
8.6v 114 ohm at tp500= 58 ohm
+8.6v 95 ohm at W975 = 16 ohm
+5v 330 ohm at W985 = 16 ohm
+30v 905 ohm at W965 = 16 ohm
+100v 12.5 kohm at W966 = 16 ohm

so i guess something is wrong somewhere. checked the big capacitors in the p.s, for 30V and +8.6V, both were in spec.

Are these resistance values in the manual a good reference for finding the faulty area?

regards, tjeenz

I think my biggest hurdle is going to be getting the proper Semi Rigid cables that are needed I
have no clue where to buy these........