Troubleshooting Guide - IBM 9493-AW1 Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK J1'S
VOLTAGE
(24V) ?
YES
CHECK
U4 PIN5 VOLTAGE
(5V) ?
YES
CHECK
U19, U20, U23, U24
Voltage (3.3V) ?
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE

TROUBLESHOOTING GUIDE

1. NO POWER
NO
NO
NO
- 14 -
CHECK ADAPTER,
AND FIND OUT
A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK U13, U22, L8,
C47, C144 (ARE C2, C4
SHORTED?)
CHECK U15, L9