HP 8642A Operating Manual page 372

Service
rxcr^F-tD^sl&s-tftr
N o t e s :
1. Each module in the HP 8642 has a nine digit module indentification code. The first four digits comprise the
module configuration code. Khen servicing a module, note any changes that apply specifically to its module
configuration code.
2. All circuit boards are manufactured using a hot air leveled process. These boards require extra care when
replacing components. Refer to General Service Information, paragraph 8-3.
3. W3 is a single contact blue post connector. It connects Jl pin 1 to J2 pin 1 in normal operation.
To disconnect runaway reset, move W3 over to connect Ji pin i to Jl pin 2. Ji pin 2 is a TTL High.
S c h e m a t i c General I n f o r m a t i o n
8 F - 1 0 6
Model 8 6 4 2 A / B