Read Sharp DV-700 (serv.man9) Service Manual online
DV-700S
DV-760S/H
DV-760S/H
10-1
10.
TR
OUBLESHOO
TING
FLOW CHART NO.1
The power cannot be turned on.(1)
Is the fuse normal?
See FLOW CHART No.3 <The fuse blows out.>
No
No
Is normal state restored when once unplugged
power cord is plugged again after several
seconds?
Replace the fuse.
Yes
Yes
No
Is the AT 5V line voltage normal?
Check for leak or short-circuiting of primary
circuit component?
(Q9008,Q9010,D9016,T9001,D9012-3,C9021-
2,etc)
Yes
Is the voltage of AT 12V, AT -30V and filament
normal?
No
Check each rectifying circuit of secondary circuit.
FLOW CHART NO.2
FLOW CHART NO.3
The fuse blows out.
Is there leaking or short-circuited primary
component?
No
The power cannot be turned on.(2)
Does the change from STANDBY LED indicate
turn-off?
No
Is the supply voltage of 5V fed to pins(15) and (16)
of IC8201?
Check the AT 5V line.
Yes
No
Yes
No
Is the supply voltage about 5V fed to pin(3) of
IC8201?
Check the IC8202.
Yes
No
Is there 4.0MHz oscillation at pins(1) and (2) of
IC8201?
Check the FL8201 and IC8201.
Yes
No
Does the "L" signal inputted at pin(14) of IC8201,
when the POWER button activated on the DVD.
Check the S8151 and POWER KEY line.
Yes
The STANDBY LED indicate it flashing after the
0.5sec.
No
Does the remote control "L" signal inputted at
pin(4) of IC8201, when the POWER button
activated on the remote control unit?
Check the line between the remote control
receiver and the pin(4) of IC8201.
Yes
Yes (below, confirmed operating at LED turn-off of 0.5sec interval.)
Check for short-circuiting of rectifying diode and
circuit in each rectifying circuit of secondary side.
Replace IC8201.
Yes
Replace IC8201.
No
Are the "P–CON(L)" pulse outputted from the
pin(7) of IC8201?
Replace IC8201.
Yes
No
Does the P–CON switch circuit is operate normally?
Check each component and if poor the replace.
Yes
No
Are the "H" pulse inputted into the pin(9) of IC8201?
Check or replace D9035-9.
FLOW CHART NO.6
The fluorescent display tube does not light.
No
Is the supply voltage of 5V fed to pin(18) of
IC5001?
Check the AT 5V line.
Yes
No
Is the supply voltage of -30V fed to pin(16) of
IC5001?
Check the AT -30V line and Q9025.
Yes
No
Is there 4.0 MHz oscillation at pins(19) and (20) of
IC5001?
Check FL5001, IC5001 and their periphery.
Yes
No
Check the signal lines of FIP DA, FIP CK, FIP CS
of IC5001 and IC504.
Check or replace IC5001 and IC504.
FLOW CHART NO.7
The key operation is disabled.
No
Is key switch contact and installation state?
Replace key switch.
Yes
Is the control voltage normally into the pins(95)
and (96) of IC504?
No
Check the power circuit,D5001 and Q9026.
No
Check that the fluorescent display tube is free from
damages such as crack.
Yes
Are the filament voltage applied between (1) and
(62) of the fluorescent display tube?
Also negative voltage applied between these pins
and GND.
Yes
Check the fluorescent display tube and its periphery.
FLOW CHART NO.4
When the output voltage fluctuates.
No
Does the secondary side photocoupler circuit
operate normally?
Check the circuit and replace the parts.
(D9020, D9041, D9046, Q9028, etc.)
Yes
No
Does the primary side photocoupler circuit
operate normally?
Check the circuit and replace the parts.
(D9020, D9023, D9040, etc.)
FLOW CHART NO.5
When buzz is heard from the vicinity of power circuit.
Check for short-circuiting of rectifying diode and circuit in each rectifying circuit of secondary side.
(D9005-8,D9025,IC9001-3,Q9020-27,etc.)
Yes
Replace D9020.
KEY-1/2 INPUT
5.0V
4.3V
3.8V
3.1V
2.4V
1.9V
1.3V
0.6V
0V
OFF
S8106
STOP
S8105
S8154
S8104
S8103
S8101
S8153
STILL/PAUSE GAMMA
SKIP(+)
SKIP(-)
S.PICTURE
PLAY
KEY–1
KEY–2
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