Products > Test Equipment
8116A Code 42
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.
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