Daewoo DQR-1000D, Service Manual

Page: 46 / 106

46
TROUBLESHOOTING
1. No output voltage of Power Circuit
Output voltage of D821, D822,
D823, D826?
YES
NO
NO
NO
YES
Output Voltage of D821, D822,
D823, D826?
Check other parts.
Check ON/OFF Control.
Replace bad parts
When Power is ON, Pin 8 of P821
is +5 voltage?
Check IC804, IC805, IC806
Check POWER CODE
(+) Voltage of C805.
YES
NO
NO
NO
YES
Switching Waveform on Drain of
Q801?
Replace POWER CORD.
Check F801, L801, L802, D801,
R802.
Check D805, IC802, Q801
NO
1. POWER CIRCUIT
** DVM Voltage Measure **
On 110 Voltage input, DC 80–10 Voltage
On 220 Voltage input, DC 190–20 Voltage