DAEWOO ELECTRONICS DV 115, Руководство по обслуживанию

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