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(POWER INDICATOR OFF)
CHECK J603
1
PIN5, PIN6 (5V)?
U202 PIN 32
1
VOLTAGE (5V) ?
CHECK KEY CONTROL
CONNECTOR ROUTINE
2
VOLTAGE REPEATED AS
PULSE SHAPE?
CHECK DATA LINE
CONNECTION(U201, U202)
Waveforms
1
J603-#5,6/U202-#32
TROUBLESHOOTING GUIDE
NO POWER
VOLTAGE
YES
CHECK
YES
IS U201
PIN 5 OR 7
YES
2
U201-#5,7
1. NO POWER
NO
NO
NO
- 14 -
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK 5VS LINE
(OPEN CHECK)
NO PROBLEM
CHECK U201 VCC
XTAL, RESET
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