HP 8642A Operating Manual page 566

Servi ce Model 8642A/B
N o t e s :
1. Each module in the HP 6642 has a nine digit module identification code. The first four digits comprise the
nodule configuration code. Mhen servicing a module, note any changes that apply specifically to its nodule
configuration code.
2. XI and X2 are pads on the ciruit board. No connection between then is provided.
3. All circuit boards are Manufactured using a hot air leveled process. These boards require extra care Mhen
replacing components. Refer to General Service Information, paragraph 8-3.
CABLE PLUG
TO A6A2 J1
+5V GND
+ 15V
DIAGNOSTIC BUS
S c h e m a t i c General Information
8 K - 1 0 8