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5.1.3 SYSTEM TEST FLOW
Check the AC
Voltage power PCBA (110V or
Switch on the power PCBA
voltage outputs OK?
(5V, 3.3V, 12V, 5.6V
Make sure the main PCBA don't
short on VCC and switch it on.
Is 3.3V and 1.8V DC
outputs normal on main
Connect to PC RS232 cable and
update the FLASH memory code.
Update FLASH
successfully?
TEST
220V)
YES
Is the DC
MOTOR)
YES
YES
PCBA?
YES
YES
A
NO
Replace power PCBA or AC transformer.
NO
Repair or replace power PCBA
NO
Check the regulators or related diodes.
1. Check 27MHz system clock.
2. Check system reset circuit.
NO
3. Check FLASH R/W enable signal PRD,
RWR.
4. Check RS232 SIGNALS.
5. Check FLASH memory related circuit.
(No.YD118)1-15
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