Read Sharp DV-L70 (serv.man3) Service Manual online
17
DV-L70S
DV-L70BL
DV-L70W
YES
NO
YES
In case of DVD:Is the input signal supplied to the
pins (58, 63), (59, 64), (60, 3) and (61, 2)of IC303?
In case of CD: Is the input signal supplied to the pins
(49, 55), (50, 54), (52, 53), 46 and 47 of IC303?
NO
Is the FE signal output to the pin 21 of IC303?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup cable.
Refer to "The disc is not recognized. (When the
focus servo does not function)".
NO
When the playback button is pressed while both
tray switch(S1001) and LD switch(S502) are held
down with a disc loaded, the disc rotates but stops
immediately.
YES
The disc is not recognized.
(In case of focus error)
FLOW CHART NO.8
NO
NO
The disc is not recognized.
(When the focus servo does not function)
FLOW CHART NO.9
NO
NO
NO
YES
Is the focus control signal being output to the pin
43 of IC707?
Check the line between pin 21 of IC303 and pin
38 of IC707.
Is the FE signal being input to the pin 38 of IC707?
(Check item for the symptom)
YES
Check the connection of optical pickup cable.
If it is normal, replace the pickup.
YES
YES
Check the power supply peripheral circuit.
If it is normal, replace the IC707.
NO
Is the focus control drive voltage being applied to
the pins 4 and 2 of CN301?
Check the line between IC707 and IC702.
Is the voltage of 4.8V being applied to the pins 5
and 20 of IC702?
NO
Check the M_4.8V line.
Replace the IC702.
Check the line between IC702 and connector CN301.
Is the focus control voltage being output from the
pins 24 and 25 of IC702?
Is the focus control voltage being input to the pin
17 of IC702?
YES
NO
Is the drive signal (SEL) of Q301 (LD POWER
ON) being output from the pin 52 of IC707?
Is the drive signal (LDO1) of Q307 (LD POWER
CTL) being output to the pin 45 of IC303?
When S502 is pressed, is the base of Q309 0.8V?
NO
NO
NO
Is the voltage of 3.4V being applied to the emitter
of Q308?
NO
Is the drive signal (LDO2) of Q308 (LD POWER
CTL) being output to the pin 4 of IC303?
When S502 is pressed, is the base of Q309 0.8V?
YES
The CD disc is not recognized.
(When the laser beam does not go on)
FLOW CHART NO.11
The DVD disc is not recognized.
(When the laser beam does not go on)
FLOW CHART NO.10
NO
NO
Is the voltage of 3.1V being applied to the emitter
of Q301? And, is the voltage of 3.4V being applied
to the emitter of Q307?
YES
Is the voltage of 3.1V and 2.3V being applied to
the pins 14 and 23 of CN301, respectively?
Check the line between the pin 4 of IC303 and
base of Q308.
Check the line between S502 and R397.
YES
Check the D_3.1V line and A_4.8V line. (Q309)
Check the A_4.8V line. (Q309)
YES
Check the connection of optical pickup cable.
If it is normal, replace the pickup.
Check the Q301 and line between Q307 and
CN301.
NO
Is the voltage of 2.3V being applied to the pin 9
of CN301?
YES
Check the line between Q308 and CN301.
Check the connection of optical pickup cable.
If it is normal, replace the pickup
YES
Check the line from the pin 52 of IC707, through
Q304, to the base of Q301.
Check the line between the pin 45 of IC303 and
base of Q307.
Check the line between S502 and R397.
NO
YES
NO
NO
Is it possible to hold normally the disc with the
check?
Set the disc on the disc tray.
YES
Replace the main pwb unit.
YES
YES
Check the loading switch (S502).
Replace the optical pickup unit.
It is laundered by the disk cleaner.
Is the level of RF signal which is output from the
pin 28 of IC303, normal?
Check for contamination of objective lens of optical
pickup.
YES
Does a signal come out in the following, each
output terminal of the integrated circuit?
Picture signal
IC201 4pin Y-SIG.
IC201 7pin C-SIG.
Sound signal
IC801 16pin AUDIO(L-CH)-SIG.
IC801 13pin AUDIO(R-CH)-SIG.
Both picture and sound do not oper
ate nor
mally
.
FLOW CHART NO.12
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