HP 8642A Operating Manual page 413

Model 3642A/B
Service
CHANGES
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On the schematic:
* I I - At the right side of the schematic, change Jl pin 4 to pin
7.
On the Component Locator:
* C41, C42 - Note location of added components shown on page
8G-104.2
In Component Coordinates:
* C41,.C42 - Add (C41 B,l), and (C42 B,2),
On the schematic:
* In the upper left portion of the schematic, change the A 4 part
number to 08642-60225.
* C41. C42 - In OUT-OF-LOCK DETECT, add a capacitor
from U43A pin 13, to ground. Designate it C41, and give it a
value of 0-lu (Farads). Add a capacitor from U43A pin 5, to
ground. Designate it C42, and give it a value of O.lu (Farads),
rev.ISOCT85
SS9
3G-104.1