Electronics > Repair
Agilent 53132A Counter Repair (FIXED and Upgraded)
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f14:
Im checked . all rail stable and AC ripple ~<300mV for 4 rails 5V/12V/-12V and -9V. I measured on power input connector  (A1 mainboard)
I just remove some E-cap from A4 power suppy to check value with LCR meter and it still within specs
HighVoltage:
If I look at an older manual, it says:

INTERP FAIL
Interpolator calibration failed on the last measurement; therefore, no valid measurement was taken.


So, I would start at the signal input and work my way through signal path until you find something that makes no sense. Sometimes this can be tedious.
f14:

--- Quote from: HighVoltage on April 02, 2022, 02:52:08 pm ---If I look at an older manual, it says:

INTERP FAIL
Interpolator calibration failed on the last measurement; therefore, no valid measurement was taken.


So, I would start at the signal input and work my way through signal path until you find something that makes no sense. Sometimes this can be tedious.

--- End quote ---
I use a Printer ON via RS232 to see more details about this error and I have 4 line:
-Interpolator : A , MRC mode Fail
-Interpolator : B , MRC mode Fail
-Interpolator : B , CC mode Fail
-QSPI : HEX DAC Fail
Because I have only one 53131a so I can't check a good 53131a signal to compare :(

 
HighVoltage:
It is not easy to give advise at this stage.
All I know from experience is that you start looking at signals and suddenly you come to find one culprit.

Maybe you can borrow the same counter and compare signals.
Clemgill:
Hi,

I took me 3 days to successfully repair my HP53132a PSU that failed recently (relay clicking frantically)
1 resistor was open loop, 1 resistor was shortened, 1 capacitor was shortened (on the -12V output). 

The image of the schematics (found on this site) was very helpful.
I found the drawing accurate regarding the identification and placement of components,
but however there were errors or misplacement on labels.
If someone could send me a copy of the electronic file I could update it.

A bit long-lasting and tedious experience, but rich (and finally successful !)
Lessons learned :
- It takes time, don't give-up...
- Good to be retired => time is life (and not money...)
- Please short-circuit the pins of the main cap (C1 with 150ohm resistor) before touching the board (300 Volts looming !...)
-> It never happened to me..... :)
- Start with the outputs : If there are still talking a bit, but one is full zero Volt => focus on this one
- Focus on the larger, power dissipating resistors... and the electrolytic caps naturally
- Thanks to the good old times board design : through hole components and everything labeled !
 
Gilles. 
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