DV-620 (serv.man3). - Section 2 - Test mode, Troubleshooting - page 13-19 - Sharp DVD Service Manual (repair manual). Page 6

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DV-620H
DV-620S
18
Is the signal from the pins(70) and (69) of IC504
input into the pins(1) and (28) of IC702?
Is the loading motor drive voltage applied to the 
terminal of loading motor?
Replace IC702.
Check PC 8V line.
FLOW CHART NO.16
Check the LD-RVS/FWD signal line between IC702 
and the IC504.
Is loading motor drive voltage output from the 
pins(9) and (10) of IC702?
Check for mechanism and gear engagement and breakage.
Is 8V  voltage applied to the pin(8) of IC702?
Check the line between the IC702 and the 
loading motor.
Does the optical pickup move up and down after 
the disc is removed?(Checking of symptom.)
Is FE signal output to the pin(21) of IC302 when 
the disc is set?
No
FLOW CHART NO.17
See FLOW CHART NO.18<The [No Disc] indication.
(In case focus servo does not function.)>
Is there input signal on the pins(50,55) and (49,54) 
of IC302?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
Replace IC302.
Is FE signal inputted into the pin(8) of IC401.
Check or replace IC401.
Check the line between the IC302 and IC401.
See FLOW CHART NO.16<The disc tray cannot be opened and closed.>
Are the "L" pulse outputted from the pin(10) of
IC8201?
Are the "L" pulse inputted into the pin(11) of
IC8201?
Replace IC8201.
Check the S8102 and OPEN/CLOSE KEY line.
FLOW CHART NO.15
Check the line between the pin(106) of IC504 and the 
pin(11) of IC8201. (Check the TRAY ACK line and Q8202.)
Dose the "L" pulse inputted into the pin(13) of 
IC8201, when the OPEN/CLOSE button is 
activated on the DVD? 
FLOW CHART NO.14
Is 5V voltage supplied at pin(1) of IC9004?
Check the secondary circuit, AT 5V line.
Is voltage of 2.5V sent out from the pin(2) of
IC9004?
Check for load circuit short-circuiting or leak.
Check the IC9004 periphery circuit.
Replace IC9004.
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
No
PC 2.5V is not output.(PC 3.3V(1), (2) is possib
le
The disc tr
a
y
 cannot be opened and closed.
(F
or remote control is possib
le
.)
The disc tr
a
y
 cannot be opened and closed.
The [No Disc] indication.
 (In case of f
ocus error)
FLOW CHART NO.18
Is the focus control signal output to the pin(14) of
IC401?
Check the IC401 DAC power source periphery 
circuit. If it is normal, replace IC401.
Check the focus control signal (DA0) line between 
the IC702 and IC401.
Is 8V voltage applied to the pin(8) of IC702?
Check the line between the IC702 and the focus
actuator.
Check PC 8V line.
Is the focus control signal from the pin(14) of IC401
input into the pin(23) of IC702?
Is the focus control drive voltage output from the 
pins (17) and (18) of IC702?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
Is the focus control drive voltage applied to the
terminal of focus actuator?
Replace IC702.
Is the Q301(LD POWER ON) drive signal
(VOSCON) output to the pin(150) of IC401?
Is the Q307(LD POWER CTL) drive output to the
pin(45) of IC302? (Checking of symptom.)
Is 5V voltage applied to the emitter of Q301 and
Q307?
Check the line between the pin(150) of IC401 and 
the base of Q301 through Q304.
Check the line between the pin(45) of IC302 and 
the base of Q307.
Check the A_5V line.
Are the 5V and 2.3V voltage supplied to the pins
(11) and (9) of pickup terminal.
Check the line between the Q301, Q307 and 
pickup terminal.
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
Is it possible to hold normally the disc with the
check?
FLOW CHART NO.19
Set the disc on the disc tray.
Replace the main PWB unit.
Check the video amplifier unit and the audio amplifier unit.(Q209, Q210, Q211, IC6001)
Check the loading switch.
Check for contamination of objective lens of 
optical pickup.
Replace the optical pickup unit.
Is the level of RF signal which is output from
pin(28) of IC302, normal?
FLOW CHART NO.20
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
The [No Disc] indication.
 (In case f
ocus ser
v
o
 does
not function.)
The [No Disc] indication.
 (When the laser beam 
does not light.)
Both picture and sound do not oper
ate nor
mally
.
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