Read Sharp DV-620 (serv.man3) Service Manual online
DV-620H
DV-620S
DV-620S
16
9.
TR
OUBLESHOO
TING
Is the fuse normal?
See FLOW CHART No.3 <The fuse blows out.>
Is normal state restored when once unplugged
power cord is plugged again after several
seconds?
Replace the fuse.
Is the AT 5V line voltage normal?
Check for leak or short-circuiting of primary
circuit component?
(Q9007, Q9010, D9016, T9001, D9013, C9021-2,
etc.)
Is the voltage of AT 12V, AT -30V and filament
voltage normal?
Check each rectifying circuit of secondary circuit.
No
Does the change from STANDBY LED indicate
turn-off?
Is the supply voltage of 5V fed to pins(15) and (16)
of IC8201?
Check the AT 5V line.
Yes
Is the supply voltage about 5V fed to pin(3) of
IC8201?
Check the IC8202.
Is there 4.0MHz oscillation at pins(1) and (2) of
IC8201?
Check the FL8201 and IC8201.
Does the "L" signal inputted at pin(14) of IC8201,
when the POWER button activated on the DVD?
Check the S8101 and POWER KEY line.
The STANDBY LED indicate it flashing after 0.5sec.
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.
Replace IC8201.
Are the "P–CON(L)" pulse outputted from the
pin(7) of IC8201?
Replace IC8201.
Does the P–CON switch circuit is operate normally?
(Q9020-1, Q9023, Q9025-7, IC9003-4, D9030,
D9042-3, D9046)
Check each component and if poor the replace.
Is there leaking or short-circuited primary
component?
Check for short-circuiting of rectifying diode and
circuit in each rectifying circuit of secondary side.
Replace IC8201.
Are the "H" pulse inputted into the pin(9) of IC8201?
Check or replace D9035-9, D9044-5.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes (below, confirmed operating at LED turn-off of 0.5sec interval.)
No
No
Yes
The power cannot be turned on.(1)
No
No
No
No
No
No
No
No
No
No
No
The power cannot be turned on.(2)
FLOW CHART NO.1
FLOW CHART NO.2
FLOW CHART NO.3
The fuse blows out.
FLOW CHART NO.6
Is the supply voltage of 5V fed to pin(14) and pin
(38) of IC5001?
Check the PC 5V line.
Is the supply voltage of -19V fed to pin(27) of
IC5001?
Check the PC -19V line and Q9025.
Check R5014-5, IC5001 and their periphery.
Is there 500kHz oscillation at pin(44) of IC5001?
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
No
Is key switch contact and installation state normal?
Replace key switch.
Is the control voltage normally into the pins(95)
and (96) of IC504?
Check the power circuit, D5004 and Q9026.
Check that the fluorescent display tube is free from
damages such as crack.
Are the filament voltage applied between (1), (2)
and (31), (32) of the fluorescent display tube?
Also negative voltage applied between these pins
and GND.
Check the fluorescent display tube and its periphery?
FLOW CHART NO.4
Does the secondary side photocoupler circuit
operate normally?
Check the circuit and replace the parts.
(D9020, D9041, D9046, Q9028, etc.)
Does the primary side photocoupler circuit
operate normally?
Check the circuit and replace the parts.
(D9020, D9023, D9040, etc.)
FLOW CHART NO.5
Check for short-circuiting of rectifying diode and circuit in each rectifying circuit of secondary side.
(D9005-8, D9025, IC9001-4, Q9020-1, Q9023, Q9025-7, etc.)
Replace D9020.
No
No
No
No
No
No
No
No
When the output voltage fluctuates.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
When buzz is heard from the vicinity of power circuit.
The fluorescent display tube does not light.
The key operation is disabled.
KEY-1/2
3.3V
2.5V
1.8V
0.9V
0V
KEY–2
KEY–1
OFF
S8104
STILL/PAUSE
S8103
STOP
S8105
PLAY
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