Read Sharp DV-L88 (serv.man8) Service Manual online
DV-L88S/S(H)
DV-L88W/W(A)
DV-L88W/W(A)
21
FLOW CHART NO.4
Is the tray lid open?
When S802 is pressed, are the pins 3 and 4
short-circuited?
Check the connection between pins 2 or 4 of S802
and pin 27 of IC502.
Does the pickup move in the direction of inner
periphery?
No
No
No
No
Check the cable connecting to the CN7302.
(Check the CN7302 and line of pins 2 and 4 of IC705.)
Check the cable connecting to the CN7303.
Replace the S802.
Yes
No
Yes
After moving in the direction of inner periphery,
does the pickup move in the direction of outer
periphery?
Yes
Check the M_4.8V line.
Is 4.8V being applied to the pins 16 and 17 of
IC7701?
Yes
Replace the IC7701.
Yes
The disc does not rotate.
No
Is FE signal inputted into the pin 150 of IC701.
Check or replace IC701.
Check the line between the IC301 and IC701.
FLOW CHART NO.5
When removing disc and applying load to spin
motor (by stopping with hand, etc.), objective lends
moves up and down? (Checking item to symptom)
Note) If load is not applied to spin, lens does not
move and becomes NO DISC immediately.
See FLOW CHART NO.6<The [No Disc] indication.
(In case focus servo does not function.)>
Replace IC301.
Is there input signal on the pins(50,55) and (49,54)
of IC301?
Is FE signal output to the pin 21 of IC301 when
the disc is set?
No
No
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
Yes
No
Yes
Yes
Yes
The [No Disc] indication.
(In case of f
ocus error)
In case of CD For DVD, 58, 59, 63, and 64
FLOW CHART NO.6
Is the focus control signal output to the pin 14 of
IC701?
Check the IC701 DAC power source periphery
circuit. If it is normal, replace IC701.
Check M_5V line.
Is 8V voltage applied to the pins 8 and 27 and
25 and 24 of IC705?
Replace IC705.
Is the focus control signal from the pin 158 of
IC701 input into the pin 20 of IC705?
Check the focus control signal (DA0) line between
the IC705 and IC701.
Is the focus control drive voltage output from the
pins 29 and 30 of IC705?
No
No
No
Yes
Yes
Yes
No
Yes
The [No Disc] indication.
(In case f
ocus ser
v
o
does not function.)
Check the line between the IC705 and the focus
actuator.
Focus control drive voltage applied to 27, 29 pin
of CN7301 (focus actuator terminal)?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
FLOW CHART NO.7
Check the D_3.1V line and A_5V line.
Is the drive signal (SEL) of Q301 (LD POWER
ON) being output to the pin 37 of IC701?
Is the drive signal (LDO1) of Q302 (LD POWER
CTL) being output to the pin 45 of IC301?
When S801 is pressed, is the base of Q303 0.8V?
Is the voltage of 3.3V being applied to the emitter
of Q301? And, is the voltage of 3.4V being applied
to the emitter of Q302?
Is the voltage of 3.1V and 2.3V being applied to
the pins 14 and 23 of CN7301, respectively?
Check the connection of optical pickup cable.
If it is normal, replace the pickup.
Check the Q301 and line between Q302 and
CN301.
Check the line from the pin 37 of IC701 to the base
of Q301.
Check the line between the pin 45 of IC301 and
base of Q302.
Check the line between S801 and R323.
No
No
No
No
No
No
Yes
Yes
Yes
Yes
The DVD disc is not recognized.
(When the laser beam does not go on)
FLOW CHART NO.8
Check the A_5V line.
Is the drive signal (LDO2) of Q304 (LD POWER
CTL) being output to the pin 4 of IC301?
When S801 is pressed, is the base of Q304 0.8V?
Is the voltage of 3.4V being applied to the emitter
of Q303?
Is the voltage of 2.3V being applied to the pin 9
of CN7301?
Check the connection of optical pickup cable.
If it is normal, replace the pickup
Check the line between Q304 and CN7301.
Check the line between the pin 4 of IC301 and
base of Q303.
Check the line between S801 and R323.
No
No
No
No
Yes
Yes
Yes
The CD disc is not recognized.
(When the laser beam does not go on)
FLOW CHART NO.9
Check tray switch. S801, 802
No
Check for contamination of objective lens of
optical pickup.
Replace the optical pickup unit.
When cover is closed, disc starts rotating?
Check the main PWB unit.
Set disc to mechanism.
Replace the main PWB unit.
Is the level of RF signal which is output from
pin 28 of IC301, normal?
No
No
No
Yes
Yes
Yes
Yes
Both picture and sound do not oper
ate nor
mally
.(1)
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