EIP
8114A
Service Guide
RISK OF EXPLOSION!
DO
NOT
allow Lithium batteries to become short-circuited
DO
NOT
use excessive heat when unsoldering/soldering Lithium
batteries.
DO
dispose of batteries in an approved manner.
RPG Unit
This unit sends an interrupt to the Microprocessor, and
a directional signal. These signals are buffered by
and
Check
that when the knob is rotated signals
are present at the input, pin and at the output, pin 8
of
and at the input, pin 12 and at the output, pin
11 of
Reset
At switch-on U13 pin 16 goes high. It then goes low
after approximately
ms, and remains low until a
subsequent reset.
If
Microprocessor Board passes all the above
checks
and still
does
not function, its repair is outside the scope of this Troubleshooting
guide, and it is recommended that the PC Board be returned to a
Hewlett-Packard Service Center.
Troubleshooting
1
