Electronics > Repair

Fluke 8506A , need help with repair

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GigaJoe:
purchase for fun nearby ... (it had a cal seal on a screw case, and that important ... )

Voltmeter works, boards Ohm and AC do not detect when reset, and  do "error -9" when button option pressed  but installed, and cal. seal on screw ...


so I started from Ohm board ...
It appears that the board match with 5502A schematics, so ....  I'm wonder if OHM board from 5502A not compatible with 5506A ; can anyone clarify if possible ?

Below a digital part of board, If I correct, digital 1 on input IC1 IC2 IC3 (and IC0 , IC4 - ignored) command bus on left side generating ACK - "1" on board, by Q1
see: digit ohm parts.png

here below, after "reset" diagram; the ohm board wasn't installed, and device didnt reach  full board detection in my understanding , as ID 00011 didnt respond it stops, and when go to off routine detection, finally switching to voltmeter

"111" as well match with second column , consider C0, C4 ignored by ohm board, so ohm board would be never ever detected.
but -  fluke 5506a service manual page 214,  table 602a-8  defining the same situation : IC1,2,3 - HIGH

i really dont get it how it may detect ohm board ....
see: reset bus.png

bdunham7:

--- Quote from: GigaJoe on December 06, 2022, 04:17:20 am ---It appears that the board match with 5502A schematics, so ....  I'm wonder if OHM board from 5502A not compatible with 5506A ; can anyone clarify if possible ?

--- End quote ---
I'm not 100% sure, but I can let you know in a few days.  I just happen to have examples of each torn to bits on my bench right now.  The 8506A is going back together and perhaps by the weekend I can get to the point where I can test that for you if nobody else has jumped in by then.

precaud:
This is testing the memory cells, but IIRC the Ohms boards are the same for 8502 and 8506. AC boards are not.

m k:
Boards have numbers, what are they?

Take it to the bare bones first, AC and ohms modules out.

First it should greet you with software version.
Then it shows the configuration.
Finally it starts measuring, blinking sample LED indicates that.

Next put AC module in, what it does?

Next replace AC module with Ohms module, use the same slot.
What it does?

GigaJoe:
thank everyone,

Def. I did look at the wrong sequence,  here is correct one:
see attachment
3 ID (boards) responding .    3 ID expecting , no ACK signal

guess the reason, why AC cards are different for 8506 and 05 ,  The 06 unit looking for ID 01101 for thermal AC, but regular AC ID, 10101
I may assume the rest identical for AC board, so technically possible change ID by resoldering traces on the board.


so installed ohm board still do not respond on ID signal ....

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