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TROUBLESHOOTING GUIDE
1. NO POWER
CHECK U803.
CHECK
U802 PIN 1
VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK J705
VOLTAGE
PIN5, PIN6 (5V)?
NO
CHECK 5VS LINE
(OPEN CHECK)
CHECK
U805 PIN 1 Voltage
(5V) ?
NO
CHECK IIC LINE
CONNECTION
(U501, U502)
CHECK U201 VCC,
XTAL, RESET
IS U201
PIN12 (3.3V)
VOLTAGE REPEATED
AS PULSE
SHAPE ?
NO
YES
YES
YES
NO PROBLEM
NO
CHECK KEY CONTROL
CONNECTOR ROUTINE
Содержание LB501K-GL
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