DVF-3080-S/8100
13
ELECTRICAL TROUBLESHOOTING GUIDE
Laser turns on when
reading disc?)
C
Yes
LD01 or LD02 output
properly?
Check the laser power circuit
on M3355 and connecting to
power transistor. (Q201, Q202)
Collector
voltage of power
transistor is OK?
( Q201, Q202)
Check the related circuit on
laser power TR
D
No
Yes
Check cable connection between
transistor output and pick-up head.
Check the RF connection
between MD and M3355.
Put disc in?
Proper RF signal?
Laser off
Check the related circuit
on M3355 RF signal
Does spindle rotate?
Disc ID is correct?
Proper
Spindle signal on
M3355
Check spindle related
circuit on M3355
Proper RF signal?
Check the related circuit
on M3355 RF signal
Check the RF connection
between MD and M3355.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Does
the SLED move
to inner side when it is at
outer position
on?
B
Yes
Motor
Driver DRVSB
Pin is High?
Check the connection line of
DRVSB signal
Motor
Driver DRVSB
Pin is High?
Check the related circuit of
FOCUS.
SLED+
and SLED- output
properly ?
Check the amp circuit on
motor driver.
C
No
Check the cable connection
with MECHA.
Optical
Lens has movements
for searching
Focus?
Proper Focus outputs
to motor driver?
Check Focus connection on
M3355 and motor driver.
Proper F+
& F- outputs?
Check the amp circuit on
motor driver.
Check cable connect on with
pick-up head.
yes
No
Do not put in disc and tray
close.
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
