19
DVM-1845/745
FLOW CHART NO.2
The fuse blows out.
After servicing, replace the fuse.
Check the presence that the primary component
is leaking or shorted and service it if defective.
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
FLOW CHART NO.3
When the output voltage fluctuates.
Yes
No
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of AV circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side,
and service it if defective. (D1003, D1006, D1008, D1016, D1030, Q1002, Q1004, Q1011, Q1014, Q1020, Q1022)
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1001, D1012, D1024 and their periphery,
and service it if defective.
Check IC1001, IC1006 and their
periphery, and service it if defective.
FLOW CHART NO.5
-FL is not outputted.
Is -24V voltage supplied to the anode of D1003?
Check D1003 and periphery circuit, and service it
if defective.
Check if there is any leak or short-circuit
on the loaded circuit, and service it if defective.
Yes
No
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the CHG +3.3V line voltage normal?
Is each voltage of the secondary side normal?
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or shor-circuiting on the
primary circuit component, and service it if defective.
(Q1031, Q1003, T1001, D1001, D1002, D1004,
D1005, D1011, C1003, C1005)
Check each rectifying circuit of the secondary circuit
and service it if defective.
Yes
Yes
Yes
Is the voltage of 3.3V supplied to pin(1) of IC3001?
Yes
When pressing POWER button (SW2101), is the
voltage of 0V supplied to pin(42) of IC3001?
Yes
Replace IC3001.
Yes
No
No
No
No
Check POWER button (SW2101) and their
periphery, and service it if defective.
No
Check CHG+3.3V line and service it if defective.
See FLOW CHART No.2 <The fuse blows out.>
No
FLOW CHART NO.2
The fuse blows out.
After servicing, replace the fuse.
Check the presence that the primary component
is leaking or shorted and service it if defective.
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
FLOW CHART NO.3
When the output voltage fluctuates.
Yes
No
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of AV circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side,
and service it if defective. (D1003, D1006, D1008, D1016, D1030, Q1002, Q1004, Q1011, Q1014, Q1020, Q1022)
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1001, D1012, D1024 and their periphery,
and service it if defective.
Check IC1001, IC1006 and their
periphery, and service it if defective.
FLOW CHART NO.5
-FL is not outputted.
Is -24V voltage supplied to the anode of D1003?
Check D1003 and periphery circuit, and service it
if defective.
Check if there is any leak or short-circuit
on the loaded circuit, and service it if defective.
Yes
No
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the CHG +3.3V line voltage normal?
Is each voltage of the secondary side normal?
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or shor-circuiting on the
primary circuit component, and service it if defective.
(Q1031, Q1003, T1001, D1001, D1002, D1004,
D1005, D1011, C1003, C1005)
Check each rectifying circuit of the secondary circuit
and service it if defective.
Yes
Yes
Yes
Is the voltage of 3.3V supplied to pin(1) of IC3001?
Yes
When pressing POWER button (SW2101), is the
voltage of 0V supplied to pin(42) of IC3001?
Yes
Replace IC3001.
Yes
No
No
No
No
Check POWER button (SW2101) and their
periphery, and service it if defective.
No
Check CHG+3.3V line and service it if defective.
See FLOW CHART No.2 <The fuse blows out.>
No
TROUBLESHOOTING
Содержание DVM-1845/745
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Страница 35: ...35 DVM 1845 745 DVD Main 1 4 Schematic Diagram 1 NOTE Either IC461 or IC462 is used for DVD MAIN CBA UNIT...
Страница 36: ...36 DVM 1845 745 DVD Main 2 4 Schematic Diagram...
Страница 37: ...37 DVM 1845 745 DVD Main 3 4 Schematic Diagram...
Страница 38: ...38 DVM 1845 745 DVD Main 4 4 Schematic Diagram...
Страница 40: ...40 DVM 1845 745 AV 2 2 Schematic Diagram...
Страница 41: ...41 DVM 1845 745 Changer 1 2 Function Power Switch Switch Schematic Diagram...
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Страница 57: ...57 DVM 1845 745 Packing X10 X22 X21 X5 X2 X4 S2 S2 S3 S3 S1 A30 A30 A22 S10 X1 S4 Unit...
