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On Wed, 10/11/17, 'Paul Bicknell' paul@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: RE: [hp_agilent_equipment] HP AN/USM 281A Oscilliscope needs repair (San Antonio TX)
To: hp_agilent_equipment@...
Date: Wednesday, October 11, 2017, 1:00 PM


?

















Hi
Andrew


?

You
seam to be going in circles as you say
I don't have a signal generator I
posted text below on Sunday 8 oct

Basically
you do have a signal
generator on the scope it is called the calibrator and if
working produces a 10
volt square wave

From you posting
to date it appears the vertical amps are working


But you say the
horizontal control has no effect if so then the text
below will help narrow down the fault


?

There are a
number of different plug ins so it might help if you posted
the plug in numbers there should be one for the left
vertical and one for the
right time base

we can explain
about x time base triggering after you have proved the
simple test below


?

Hi re
fixing 180 from memory

Before
removing the transistors a simple
test

Have
you tested all the power supply rails
on the pcb for the main frame for this test I would remove
the plugging just in
case they are causing any problems ?


?

Display
switch on right hand side 3rd
one down turn it clock wise this puts the X amplifier into
external with the
intensity turned up you should have a spot


turning
the pot fully clock wise gives
maximum sensitivity ?( right hand side 2rd one
down magnifier
should be set to 1 )

now
connect a signal into the external
?BNC input below ?I just held a length of wire and put
into the bnc
socket ?you should see a horizontal line if not it is
probably the drive
transistors

if
you have movement connect the BNC input
below ?to the calibration terminal you should see 2 dots
one on left one
on right if one hasten moved then it is that pare of
transistors that has a
fault


?

this
was my first HP scope to repair
?Paul B


?









From:
hp_agilent_equipment@...
[mailto: hp_agilent_equipment@... ]


Sent: 11
October 2017 02:11

To:
hp_agilent_equipment@...

Subject: RE:
[hp_agilent_equipment] HP AN/USM 281A Oscilliscope needs
repair ( San Antonio TX )




?

?










Thanks for the
help. What can I use for a signal? I
don't have a signal generator. I tried testing it with a
3v 800ma wall wart
using the EXT INPUT and didn't get a dot or anything.



I tried using a 1.5v battery on the lower left input probe
and, while holding
the test button down I could see the dot jump up and down
1.5 square up each
time I contacted the battery terminal. I can't get a dot
to appear without
holding the test button, so I feel like the knobs and
switches probably aren't
adjusted correctly.

It worked the same way with the lower left INPUT when I
tried the wall wart.
The dot jumped up 3 squares, but only when holding the test
beam button.



Do you think I'm doing the test correctly, or are there
other switches and
knobs I need to try different settings with?



Thank again!



Andrew

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

On Sun, 10/8/17, ' Paul
Bicknell ' paul@...
[hp_agilent_equipment] <
hp_agilent_equipment@... >
wrote:



Subject: RE: [hp_agilent_equipment] HP AN/USM 281A
Oscilliscope needs repair ( San Antonio TX )

To: hp_agilent_equipment@...

Date: Sunday, October 8, 2017, 1:05 PM





?



































Hi re

fixing 180 from memory



Before

removing the transistors a simple

test



Have

you tested all the power supply rails

on the pcb for the main frame for this test I would
remove

the plugging just in

case they are causing any problems ?





?



Display

switch on right hand side 3rd

one down turn it clock wise this puts the X amplifier
into

external with the intensity

turned up you should have a spot



turning

the pot fully clock wise gives

maximum sensitivity ?( right hand side 2rd one

down magnifier

should be set to 1 )



now

connect a signal into the external ?BNC

input below ?I just held a length of wire and put into
the

bnc socket ?you

should see a horizontal line if not it is probably the
drive

transistors



if

you have movement connect the BNC input

below ?to the calibration terminal you should see 2 dots

one on left one

on right if one hasten moved then it is that pare of

transistors that has a

fault





?



this

was my first HP scope to repair ?Paul

B



















From:

hp_agilent_equipment@...


[mailto: hp_agilent_equipment@...
]





Sent: 08

October 2017 18:02



To:

hp_agilent_equipment@...



Subject: RE:

[hp_agilent_equipment] HP AN/USM 281A Oscilliscope needs

repair ( San Antonio TX )









?



?





















I have a fluke

digital multimeter, a weller soldering

station, and not much else. I'm slowly building up
what

I can when I have a

specific need or find a good deal.







I bought a set of probes for it off ebay











There's no rush for me to fix it, so I can take the
next

10 years if need be. Should

I de-solder the transistors for testing?







I heard that with very high voltages, the thickness of
the

gloves are what's

important. That's why lineman's gloves and spark

plug boots are so thick.



I have a thick pair of rubber gloves that I'll
probably

be wearing for safety

after leaving it unplugged for a while.







I also need to make a high resistance capacitor discharge

tool. I believe I

have some high capacity resistors I've salvaged from

some equipment.







Thanks for the tips. Any further help is appreciated.



Andrew



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



On Sun, 10/8/17, Reginald Beardsley pulaskite@...

[hp_agilent_equipment]

< hp_agilent_equipment@...
>

wrote:







Subject: RE: [hp_agilent_equipment] HP AN/USM 281A

Oscilliscope needs repair ( San
Antonio TX )



To: hp_agilent_equipment@...



Date: Sunday, October 8, 2017, 11:30 AM











?







































What test gear do you have? That will help people



advise you. Did it come with a probe?















The manual suggests approaches appropriate to a

commercial



environment where labor is expensive and parts are

readily



obtained. In your case labor is actually what you're



after. Except you'll call it "experience"



after you're done. Being able to say you have

repaired



a 100 MHz analog scope is non-trivial. That's a good



scope, though old age will make it a bit cranky. It will



serve you well even when you get newer gear.















You can make a limited test of the transistors by

measuring



the forward resistance of the B-E and B-C junctions with

an



ohmmeter. The B-C resistance will be smaller than the B-E



resistance because the larger area of the collector

trumps



the higher doping level of the emitter. Use the highest



resistance ranges. You may encounter problems with DMMs



that don't supply sufficient voltage to turn on the



transistor. I learned this trick using an analog VOM. It



doesn't work with the Harbor Freight cheapy DMMs.















If you've got one of the Harbor Freight DMMs that

they



give away, measure hFE with it. That should suffice for



testing the two transistors, But beware of the crappy



transistor sockets, You should probably solder some leads



with grabbers or alligator clips. I just tried two red



ones. One worked, the other didn't, but both were



intermittent. An old yellow HF DMM had a better socket

and



worked just fine (once I plugged it in correctly ;-)















Connect to the probe compensation signal for testing.

Make



sure you know where the high voltages are and stay away

from



them. I've heard it's rather painful at best and



lethal at worst. If you do need to work near it, keep

your



left hand in your pocket and wear rubber sole shoes. HF



nitrile gloves might not be a bad idea, though I

don't



know how good they'd be. Not quite sure what is



recommended for southpaws. Be aware that the HV

capacitors



and the CRT can hold a charge for quite a while. Before

you



EVER touch anything in the HV section, ground it with a



screwdriver first with the unit unplugged.















Whenever you get tired or confused, stop. It took me over

a



week to fix the horizontal section in my Dumont


working a



couple of hours each evening.















Most important....















Have Fun!







Reg















































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