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5. Trouble Shooting Guide
-. Front Circuit DV-115/125
Push power on.
1
Check if the POWER PART of the FRONT is OK.
No
LED ON Refer to POWER SUPPLY Yes Yes No Check if the REMOCON waveform of the IC904 PIN(8). No circuit.
STANDBY ON
Yes
Check if the IC905 PIN(13) is OK. Yes
No
LED OFF
No Yes Check if the CN906 is OK. No
Yes
Refer to MICOM circuit.
Replace IC905.
Check RMC circuit.
Re connect it. Does Initial work? No Yes
2 Karaoke option only
Check if the FRONT POWER is OK.
No
Check if the MIC is OK.
No
Yes
Refer to POWER SW PCB Refer to POWER SUPPLY circuit. CN904 PIN4: +5.6V PIN3: -30V
Yes
Check if the POWER PART of the MIC is OK.
No
Refer to POWER SUPPLY circuit. CN907 PIN1 : +5V , PIN2 : -30V PIN4 : +5.6V , PIN6 : 12V PIN8 : +12V
Check if the IC904 OSC PIN(40) waveform is OK.
No No Check if the IC904 PIN(44) is OK. No Yes Yes Replace X901.
Check if the MIC VOLUME is OK.
Yes
No
Check if the Check if the VR901 is OK. Yes CN905 is OK.
No
Yes Yes
Re-connect it. Yes
Check if the IC904 PIN (44) (45) is OK.
No Refer to POWER SUPPLY circuit. IC904 PIN44: +5V PIN45: -30V
Replace VR901.
Check PATTERN.
Check if the 904 PIN(6) is LOW.
No
Refer to JA901 MIC JACK. Check if the ECHO VOLUME is OK. No Yes
Yes
Check if the FL901 PINS are OK. No Yes Yes Check PATTERN and RESOLDING. No
Check if the 905(1)(3) waveform.
No
Yes Refer to IC901, IC902, IC903.
Refer to MICOM circuit. Check if ALL BUTTONS are OK.
Refer to IC ES56033.
Front PCB OK.
Refer to DSP PCB.
Yes
Check if POWER PART of the FRONT is OK.
No
Check if the VOLUME is OK.
No
Yes
Refer POWER SUPPLY circuit.
Yes
Check IC904 PIN(29) (30) (31) OK.
No
Check if the HEADPHONE is OK?
No
Yes
Refer to MICOM circuit. Yes Check if the POWER is OK. No
Refer to KEY-IN line.
Check if the REMOCON is OK. No Yes
Yes
Refer to Power Supply circuit.
Check if POWER PART of the FRONT is OK.
No
Check if the CN903 PIN(5) is High.
No
Yes
Refer to Power Supply circuit.
1
2
Yes
Check PH991 circuit.
Check if IC904 PIN(7) (24) waveform OK.
No
Check if HEADPHONE JACK is OK.
No Yes
Check VR904, R926, R927 OK. No Yes
Yes
Check MAIN PCB.
Replace H/P JACK.
Refer to MICOM circuit.
Replace VR904, R926, R927.
13
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