Troubleshooting Guide - IBM 19K1902 Service Manual

TROUBLESHOOTING GUIDE

POWER INDICATOR OFF
CHECK
12V DC?
YES
CHECK
U5 OUTPUT
(5V) ?
YES
CHECK
Q1,Q2 ?
YES
TROUBLE IN LED1
1. AUDIO NO POWER
NO
NO
CHECK
VR1?
TROUBLE
IN U5
NO
- 9 -
TROUBLE BUILT
IN POWER
NO
YES
TROUBLE IN Q1, Q2
TROUBLE IN
VR1