Products > Test Equipment

8116A Code 42

<< < (13/26) > >>

MarkL:
That yellow component is a resistor network.  The "59" next to it means R59, and 1810-0243 is the part number that you can also look up in the parts list.

I never noticed that the Option 001 parts locator was missing from my PDF service manual too.  I have a printed version of the service manual and scanned in that page, attached.

Mick B:
WOW!, thank you for the missing pages, I suspected that was R59 but wasn't sure where R61 was the way the chips jump around. Really helpful. 
  I'm supposed to have the MC10101P ICs by the 17th. I pulled U32 and took voltage readings
U32 EMPTY SOCKET.
U33 CHIP IS STILL IN.
U34 CHIP IS STILL IN.
U37 EMPTY SOCKIT.

U32 Pins
1 & 16 VCC =010.9mv

2(O)    -5.134
4(I)     -2.080
5(O)    -052.12mv

3.(O)     -5.315
6.(O)     -048.63mv
7. (I)     -021.93mv

9.(O)     -1.173
13.(I)    -1.806
15.(O)   -0

10.(I)    -023.44mv
11.(O)   -5.316
14.(O)   -4.515
12.Common Input -5.318


U33 pins
1 & 16 VCC= .014.59mv

4.(I)    -4.380
5.(I)    -5.310
2.(O)   -.752mv

6.(I)    -051.19mv
7.(O)   -4.378
3.(O)   -.772mv

10.(I)   -4.378
11.(I)   -4.517 
14.(O)  -1.771

12.(I)   -1.075
13.(I)   -1.771
  9.(O)  -4.378
15.(O)  -0
8. VEE  -5.314

Pins U34
1 &16. VCC -014.384mv

4.(I)   -4.376
5.(I)   -5.315
2.(O)   -.790mv

6.(I)    -0.475mv
7.(I)    -4.375
3.(O)   -.820mv

10.(I)   -4.375
11.(I)   -5.316
14.(O)  -1.807
 
12.(I)   -1.075
13.(I)   -.778mv
  9.(O)  -1.806
15.(O)  -0
8. VEE  -5.314

Pins U37
1 &16. VCC -013.72mv

4.(I)   -2.091
5.(I)   -2.071
2.(O)  -4.377

6.(I)   -.771mv
7.(I)   -.751mv
3.(O)   -5.311

12.(I)   -1.806
13.(I)   -1.431
15.(O)  -5.317
  9.(O)   -0

10.(I)    -5.315
11.(I)    -2.088
14.(O)   -1.172
8. VEE    -5.315
 
NOTE:   You asked check U39.7. It has +3.596v
And the temp on U33 is 70C Still.



 



Mick B:
Notice the voltage on U37.11 @-2.08 there is an intermittent problem also the BUR light. I don't know what the problem is YET but sometimes when turning on, the voltage is missing from pin 11 and not at the same time as the BUR light. I will poke around and see if I can't narrow this down oh ya I can get the voltage up on pin 11 by messing with the mode switch (EBUR)

OK, it seems turning it on when in EBUR mode after being off for a min or so there is no voltage on pin U37.11
Pushing lower left buttons. Pos slope trigger, MAN, 1 Cycle will turn on -2.08v @ pin11 on U37. as well as the EBUR mode button.
I can't get the BUR light to mess up again. :-//

Mick B:
Good afternoon, The MC10101P (U32) chips have arrived, I have a JBL amp on my bench. I will get back into the HP 8116A tomorrow for those following along. Looking forward to your input Mark.

MarkL:
I've been out traveling for the last week.  Will review your latest readings and post some suggestions for next steps in the next day or two...  sorry for the delay.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod