51
DV-NC65H/S
DV-NC70H
11.
TR
OUBLESHOO
TING
(VCR)
FLOW CHART NO.1
NO
YES
NO
YES
NO
YES
NO
YES
NO
Are PC 40V, AT 27V, PC 13V, PC 5V lines
normal?
Is the fuse good?
Is the normal state restored when once unplugged
power cord is plugged again after several seconds?
Is "H" level applied at pin(1) of IC701?
The fuse blows out even when it is
replaced with new one.
See FLOW CHART NO.2 <Fuse blown out.>.
Check for leak or short-circuiting of primary circuit
part. (L901, D901~904, T901, Q901~902, etc.)
Check each rectifier circuits and short-circuit of
secondary circuit.
Check the power failure circuit. (Q706)
Are AT 5V voltage line normal?
No power
FLOW CHART NO.2
Check for leak or short-circuiting of primary
circuit part. (L901, D901~904, T901, C904, R907,
Q901~902, etc.)
Check for short-circuiting of rectifying diode and
circuit in each rectifying circuit of secondary circuit.
(D921~924, D926, D929)
Case (2)
Case (1)
Fuse blown out.
FLOW CHART NO.3
Is the voltage of AT 5V normal?
NO
YES
NO
Is 1~1.5V supplied to pins(3), (4) of IC901.
Check AT 5V rectifying circuit and secondary side.
Check PC 12V, R932.
NO
YES
YES
Are the pins(1) and (2) of IC901 turned on.
Check Q904, D913, D914 and R919.
Check the photo coupler (IC901).
Power cannot turn on from power off mode.
FLOW CHART NO.4
Is the position of mode SW (S704) and mecha
OK?
NO
YES
NO
YES
Is the pin(43) of IC701 changed from "H" to "L"
level?
Adjust the master cam.
Check VCR power line : PC 5V, PC 13V
Check DVD power line : 5V, 1.8V, 3.3V, 8V
Check serial data between video and DVD.
Turn off after power on.
FLOW CHART NO.5
Check for short-circuiting of circuit and rectifying diode of each rectifying circuit of secondary circuit
and check for failure of shunt regulator circuit. (D921~924, IC903, C927, C928)
When buzz is heard from the vicinity of power circuit.
FLOW CHART NO.6
Is the supply voltage of 5V fed up to pin(37) of IC8002?
Check STBY 5V line.
Is the supply voltage of 3.4V, 1.7V fed up to pin(38)
and pin(39) of IC8002?
Check pin(38) and pin(39) of IC8002.
Is it possible to confirm signals LCD RESET, LCD
CS, LCD DATA, LCD CLK on pins(36), (42), (43)
and (44) of IC8002?
Check signal line between IC701 and IC8002.
Is there OSC signal from pin(41) of IC8002?
Check pin(41) of IC8002.
Are common and segment signal from IC8002
supplied to LCD8002?
Replace IC8002.
Check that the fluorescent indication tube is free
from damages such as crack.
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
The VCR flourescent display tube fails light up.
Содержание DV-NC65H
Страница 63: ...63 DV NC65H S DV NC70H M E M O ...
Страница 78: ...92 DV NC65H S DV NC70H A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 13 10 DVD OPERATION CIRCUIT SCHEMATIC DIAGRAM ...
Страница 85: ...104 DV NC65H S DV NC70H A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 TERMINAL PWB SIDE A Symbol ...
Страница 87: ...106 DV NC65H S DV NC70H A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 DVD OPERATION PWB SIDE A Symbol SIDE B ...
Страница 91: ...112 DV NC65H S DV NC70H A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 M E M O ...
Страница 112: ...133 DV NC65H S DV NC70H Ref No Part No Description Code Ref No Part No Description Code ...
