TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
BOARD, AND FINDCHECK J709NO
VOLTAGE OUT A SHORT POINT
PIN5, PIN6 (5V)?AS OPENING
EACH POWER LINE
YES
CHECK
U803 PIN 3NO
CHECK U803.
VOLTAGE
(5V) ?
YES
CHECK
NOCHECK 5VS LINE
U804 PIN 3 Voltage
(OPEN CHECK)
(5V) ?
NO PROBLEM
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
IS U201
PIN114 (3.3V) NO
VOLTAGE REPEATED
AS PULSE
SHAPE ?
YES
CHECK IIC LINE
CHECK U201 VCC,
CONNECTION
XTAL, RESET
(U501, U502)
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