Zenith ZDA311 Service Manual - Page 14

Test & debug flow - code

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3. Test & debug flow TEST Check the AC Voltage Power PCBA(110V or 220V) YES NO Replace power PCBA or AC transformer. Switch on the Power PCBA YES Are the DC Voltage outputs OK? (5V, 3.3V, 12V, 5.6V MOTOR) NO Repair or Replace Power PCBA YES Make sure the main PCBA don't short on VCCs and switch it on. YES Are 3.3V and 1.8V DC outputs normal on NO main PCBA? YES Check the regulators or related diodes. Connect to PC RS232 Cable and update the FLASH memory code. YES Update FLASH successfully? YES A NO 1. Check 27MHz system clock. 2. Check system reset circuit. 3. Check FLASH R/W enable signal PRD,RWR. 4. Check RS232 SIGNALS. 5. Check FLASH Memory related circuit. 3-4

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3-4
3. Test & debug flow
TEST
Check the AC Voltage
Power PCBA(110V or 220V)
YES
Switch on the Power PCBA
YES
Are
the DC Voltage outputs OK?
(5V,
3.3V, 12V, 5.6V MOTOR)
YES
Make sure the main PCBA don't short on
VCCs and switch it on.
YES
Are
3.3V and 1.8V DC outputs normal on
main PCBA?
YES
Connect to PC RS232 Cable and update
the FLASH memory code.
YES
Update FLASH successfully?
YES
A
Replace power PCBA or AC transformer.
NO
Repair or Replace Power PCBA
NO
Check the regulators or related diodes.
NO
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal
PRD,RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
NO