HP 8642A Operating Manual page 473

Model 8642A/E
Service
CHANGES
All Serial Prefixes *
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On the Component Coordinates Table
-
«
Change the second "CU8" listed to "C139".
On the schematic:
* R184, 1S 5 - In OSCILLATOR, change the value of R184 and
R185 to 1.7 SK.
On the
*
*
Component Locator:
C141 - In grid location B,3 add C141 to the area between U16
and Rl 1.
C142 - In grid location B,3 add C142 to the area between R10
and R l l .
♦ R189 - In grid location C,2 add R1 89 to the area between U43
and R7.
In Component Coordinates:
*
On the
*
*
C141, C142, R189
h
- Add components and grid coordinates
shown above.
s^pmatic:
CI41, C142, R189, - Replace appropriate portion of the
schematic with the partial on page SJ-104-3-
In the upper left portion of the schematic, change the A 2
number to 08642-60223.
On the schematic partial:
*
On page 8J-104.3, above UNITY GAIN INVERTING AM­
PLIFIER, change the value of R184 to 1780ohms.
rev.I5JULY85
SS14
8J-1Q4.1