3-6
4. SYSTEM TEST FLOW
TEST
Replace power PCBA or AC transformer.
YES
NO
Switch on the power PCBA
Repair or Replace power PCBA
YES
NO
Make sure the main PCBA don't
short on VCCs and switch it on.
YES
Check the regulators or related diodes.
YES
NO
Connect to PC RS232 cable and
update the FLASH memory code.
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
A
YES
Check the AC
Voltage Power PCBA (110V
or 220V)
Update FLASH
successfully?
Is the DC
voltage outputs OK?
(5V, 3.3V, 12V, 5.6V
MOTOR)
Is 3.3V
and 1.8V DC outputs normal
on main PCBA?
ELECTRICAL TROUBLESHOOTING GUIDE
Summary of Contents for T517AH
Page 9: ...1 8 MEMO ...
Page 30: ...3 17 FIG 7 2 DVD F FE RFL FIG 7 3 CD F FE RFL ...
Page 35: ...3 22 13 AUDIO OUTPUT FROM MT1389S FIG 13 1 ...
Page 36: ...3 23 CONNECTOR PICTURE 1 ALL CONNECTOR PICTURE ...
Page 37: ...3 24 2 MAIN BOARD CONNECTOR PICTURE ...
Page 38: ...3 25 CN201 MD 23PIN 3 CN201 CONNECTOR PICTURE CN202 MD 9PIN 4 CN202 CONNECTOR PICTURE ...
Page 39: ...3 26 CN602 POWER 10PIN 6 CN602 CONNECTOR PICTURE CN601 Front 12PIN 5 CN601 CONNECTOR PICTURE ...
Page 40: ...3 27 CN604 USB 4PIN 7 CN604 CONNECTOR PICTURE CN605 KARAOKE 4PIN 8 CN605 CONNECTOR PICTURE ...
Page 41: ...3 28 CN705 5 1ch 12PIN 9 CN705 CONNECTOR PICTURE ...
Page 49: ...3 37 3 38 2 MPEG CIRCUIT DIAGRAM ...
Page 50: ...3 39 3 40 3 SERVO CIRCUIT DIAGRAM ...
Page 51: ...3 41 3 42 4 JACK CIRCUIT DIAGRAM ...
Page 52: ...3 43 3 44 5 SCART CIRCUIT DIAGRAM OPTION ...
Page 53: ...3 45 3 46 6 USB CIRCUIT DIAGRAM 7 KEY CIRCUIT DIAGRAM ...
Page 54: ...3 47 3 48 8 TIMER CIRCUIT DIAGRAM ...
Page 57: ...3 53 3 54 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...
Page 59: ...3 57 3 58 5 SCART P C BOARD OPTION TOP VIEW BOTTOM VIEW 6 USB P C BOARD TOP VIEW BOTTOM VIEW ...
Page 65: ...4 6 MEMO ...
Page 67: ...4 9 4 10 MEMO MEMO ...