HP LP2065

- 15 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK KEY CONTROL
CONNECTOR ROUTINE
CHECK U401
NO
NO
NO
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK 5VS LINE
(OPEN CHECK)
CHECK 2.5V AND 1.8V LINE
NO
CHECK X-TAL
YES
YES
YES
YES
CHECK J303 VOLTAGE
PIN5, PIN6 (5V)?
CHECK
U501 PIN 8
VOLTAGE (5V)?
IS U401
PIN102 (3.3V)
PIN102 (2.5V)
VOLTAGE ?
CHECK U401 PIN 202
PULSE
1
2
13
14
NO PROBLEM
Waveforms
1
J303-#5,6 (5V)
2
U401-#102(3.3V)
3
U401-#102(2.5V)
4
U401-#202