On Fri, 10/9/15, bunge@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: [hp_agilent_equipment] HP 83592B hangs 8350B sweeper
To: hp_agilent_equipment@...
Date: Friday, October 9, 2015, 9:36 PM






























My 8350B with 83592B plug-in turns on?with
flickering displays that go blank?and hangs the 8350B
with no error message,?and no response to any switches
on either the plug-in or mainframe. While flickering for a
few seconds the 8350B displays show -310 MHz start and 20
GHz stop.
It does the same to a second known
working 8350B. All data and address lines are active when
hung so I don't understand why the 8350B does not
respond.
If I press CW while the displays are
flickering it responds. I may have to power down and up
again to then enter a CW frequency, it comes up showing CW.
Once in this state I can run tests and all front panel
entries work. I ran all the A3 tests which show the ROMs and
address decoders are OK.
The frequency in CW is high by 13 to 47
MHz going from?50 MHz to 18 GHz (it covers 0.01 to 20
GHz).
The power is way off. The display shows
-2 to +23 dBm. Is this normal? (no opt 002
attenuator).?-2 is actually -17
dbM?and power does not increase until about +2.5 dBm.
At +10 dbM?it is actually +9.5
dBm.
Tomorrow I will start a full
calibration. Suggestions and tips would be appreciated.
Is there a battery backed memory in the
8350B? It seems to remember the setup for quite?a while
after being turned off. Is the save-n
non-volatile?
Does anyone have a spare cover for the
PCBs for sale? The plate that goes on top of the 83592B and
has many screws. it also holds the big heat sink in place.
It is obvious that someone else's fingers have been
inside this plug-in.

On Oct 16, 2015, at 10:47 AM, 'Peter' bunge@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

?

Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model?

My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x.

?

I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board.

?

On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in?

I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in.

?

I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc.

?

?

On Sun, 10/18/15, 'Bill Lauchlan' bill.lauchlan@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Subject: RE: [hp_agilent_equipment] HP 83592B hangs 8350B sweeper
To: hp_agilent_equipment@...
Date: Sunday, October 18, 2015, 3:03 AM


?









I think A vs B means
like an X-Y Plotter. You probably connect a Sweep Output
Ramp to “B” and then some other Test Point to “A”.
Rgds Bill Lauchlan ?From:
hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]
Sent: Saturday, October 17, 2015 7:48
PM
To:
hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] HP
83592B hangs 8350B sweeper ?? Has anyone done a
calibration on one of these plug-ins?Step 20 in
adjustments: What does A vs B mode on an oscilloscope mean?
I think HP means trigger on B and look at A ??(A + B or A
– B will not work. The waveforms are completely different
time/div and shapes)A6-TP8 does not have
positive sweeps as shown. They go negative from 0 to -10v.
Step 22: A6R37 will
not affect TP8 an far as I can see.Am I missing
something??From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]

Sent: October-17-15 5:54 PM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] HP
83592B hangs 8350B sweeper?? GREAT PROGRESS!Thanks Steve, you are
quite correct. My A7 board is marked 83595 and works in this
83592 plug-in.However I suspected that
the A6 board that was causing all the trouble was actually
from an 83595 not an 83592. I removed the 4L and 4H pots,
installed the R63 pot, moved the Band jumper, ?and
concentrated on the Sweep Control and Bandswitch
circuits.The A3 SW1
forces the signals to go through the variable gain amplifier
for troubleshooting. Using this setting I could sweep band 0
but was finding that the TP7 signal was going positive by
2.4 volts. It should start at 0v and go negative to -10v
max. There was an offset in the variable gain amplifier! I
had also noticed that the gain seemed high. The schematics
showed the gain resistors to be the same as the ones on the
bad A6 board but they were different from the ones on the
good A6 board. The parts list agreed with the resistors on
the good A6 board so I assumed them to be correct. This was
not the first error on the schematics I had found.Troubleshooting: Set sweep
from 1 MHz to 1.1 MHz so TP5 is essentially at 0v. Check TP1
(BandSw DAC O/P) is 1.195v on good A6 and 1.194 on bad A6.
So far so good. Check U5-6 is -10.05v on good A6 but is?
-12.73v on bad board. TP7 is 0v on the good A6 but is +2.4v
on the bad board. Conclusion: the gain is too high and is
tripping U14 in the Bandswitch Comparator.Change all 4 gain
resistors:R29????????
B0?????????? was 109.73k??????? change to
82.541k (TP7 is now 0v with the above test)R27????????
B1?????????? was 57.014k??????? change to
42.884kR25????????
B2?????????? was 40.423k??????? change to
30.423kR23????????
B3????????? was 40.423k??????? change to
30.423kNow the
plug-in sweeps from 0.01 to 20 GHz and the INSTR PRESET no
longer hangs the 8350B.Conclusion: The A6 board
was from an HP 83595. I can now proceed with the calibration
bu expect some problems because the resistors I used were
1%, not 0.1%, and are not the exact values. I may not have
enough range of adjustment. I may also run into problems in
the SRD and PIN diode bias circuits because of component
values.Some of the
analog switches are normally closed (PMI SW06) but are shown
open on the schematic. U2A pins 1 & 2 are switched,
U2A-2 goes to U13-11.Peter.??From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]

Sent: October-16-15 12:10 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] HP
83592B hangs 8350B sweeper?? Peter,?I have an 83594A and an
83595A wth boards that have mismatched part numbers so it
may not have been anything nefarious but if so its
contagious! There are a couple of boards that don't
match any of the manuals I've been able to find, and
there are switches that open parts of loops, and pots for
adjustments, and none are mentioned in any manual. The
"joys" of working on older gear!

SteveWB0DBS??
On Oct 16,
2015, at 10:47 AM, 'Peter' bunge@...
[hp_agilent_equipment] <hp_agilent_equipment@...>
wrote:? Has anyone noticed that boards in HP
8350 plug-ins have part numbers different from the plug-in
model?My 83592 has two boards, A6 and A7,
that have part numbers starting with 83595-x. The others
start 83592-x.?I know that replacing the A6 board
(83595-60106) with a good one (83592-60106) gets the plug-in
working, even with the 83595-x A7 board.?On the bad A6 board I have found that
a pot (R63, SRD bias) was missing and the Band 0 jumper was
in the B1 position. The board also has two extra pots which
are not shown on the schematic or component location. There
are seven single turn pots on the top left, viewed from
component side. They are shown in the 83595 manual. Did
someone try to get it running with the board from a 83595
(0.01 to 26.5 GHz) plug-in? I need to look carefully at every
component. The 60106 in the number is the same (83592-60106)
and the boards look identical but I’m sure there are
component differences as I have found. I do not believe that
this is the original board for the plug-in.?I have seen instruments put together
with odd parts before. I have an HP8656A chassis that is
part 8656A and part 8657A inside. I gave up troubleshooting
when I discovered this. This is a very dishonest practice to
do this and sell the items as-is, for parts,
etc.??










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