Read Sharp DV-700 (serv.man3) Service Manual online
DV-700S
DV-760S/H
DV-760S/H
10-3
Yes
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
No
No
Is the Q301 (LD POWER ON) drive signal (SEL)
output to the pin(52) of IC707?
Is the Q307 (LD POWER CTL) drive signal (LDO1)
output to the pin(45) of IC303?
(Checking of symptom.)
Is 3.3V voltage applied to the emitter of Q301 and,
5V voltage applied to the emitter of Q307?
Yes
Yes
Are the 3.3V and 2.3V voltage supplied to the
pins(11) and (9) of AB connector, respectively?
Check the D_3.3V (1) line and the A_5V line.
No
FLOW CHART NO.15
The disc is ejected.
(When the laser beam does not light.)
Check the line between the pin(52) of IC707 and the
base of Q301 through Q304.
Ceck the line between the pin(45) of IC303 and the
base of Q307.
No
Check the line between the Q301, Q307 and AB connector.
Yes
Replace the main PWB unit.
No
No
Set the disc on the disc tray.
Is it possible to hold normally the disc with the check?
Yes
Yes
Is the level of RF signal which is output from the
pin(28) of IC303, normal?
Yes
Check the video amplifier unit and the audio amplifier unit. (IC2004-4, IC801-3)
Check for contamination of objective lens of optical pickup.
FLOW CHART NO.16
Both picture and sound do not oper
ate nor
mally
.
Check the loading switch.
No
Replace the optical pickup unit.
No
No
Are the video signals outputted to the pins of
main unit connector CN801?
CN801 25Pin CVBS
CN801 27Pin C
CN801 29Pin Y
Yes
Check the line between the pins of main unit connector
CN801 and the pins of IC2007.
CN801 25Pin
→
IC2007 5Pin CVBS
CN801 27Pin
→
IC2007 2Pin C
CN801 29Pin
→
IC2007 12Pin Y
FLOW CHART NO.17 (For DV-700S)
Picture do not oper
ate nor
mally
.
Check the main unit.
(IC201, Q202-7 peripheral circuit.)
No
Check the peripheral circuit of Cb/V DRIVE circuit
IC2003 from the pin(4) of IC2007.
No
No
Set the disc on the disc tray.
Yes
Are the video signals shown above input into the
pins of IC2007?
IC2007 5Pin CVBS
IC2007 2Pin C
IC2007 29Pin Y
Yes
Are the video signals outputted to the specific
output terminal?
Are the composite video signals outputted to
the VIDEO OUT terminal (J2001)?
Are the luminance signals outputted to the
S–OUT terminal (J2002)?
Are the chroma signals outputted to the
S–OUT terminal (J2002)?
Check the peripheral circuit of S–YC DRIVE circuit
IC2002 from the pin(14) of IC2007.
Check the peripheral circuit of S–YC DRIVE circuit
IC2002 from the pin(15) of IC2007.
No
Yes
Are the video signal outputted to each pins of
IC2007?
IC2007 4Pin CVBS
IC2007 15Pin S–C
IC2007 14Pin S–Y
Make sure that the level of pins(9), (10) and (11) of
IC2007 is "L" level.
Check or replace IC2007.
Check the V-MUTE line.
Yes
No
Check the main unit.(IC801)
Are the audio signals outputted to the pins of main unit connector CN801?
CN801 1Pin FRONT-L
CN801 3Pin FRONT-R
Yes
Are the audio signals output to the specific
outputted terminals?
No
Are the audio signals outputted to the FRONT–L/R
OUT terminal (J2001)?
No
Check the peripheral circuit of AUDIO AMP. circuit
IC6001 from the pin(1) and (3) of CN801.
FLOW CHART NO.18 (For DV-700S)
Sound do not oper
ate nor
mally
.
Set the disc on the disc tray.
Yes
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