Zenith ZH-T202SF Series, Service Manual, Page: 32 / 57

3-5
C
Laser turns on when
reading disc?
Put disc in?
D
Check the laser power circuit on
ES8380 and connecting to
power transistor.(Q405, Q406).
Check the related circuit on laser
power transistor.
Check the related circuit on
ES8380 RF signal.
Check the SPINDLE related circuit
on ES8380.
Check the spindle control amp circuit
of motor driver.
Laser off.
Check the RF connection
between IP9009 and ES8380.
Check the cable connection
between spindle and main PCB.
Check cable connection
between transistor output and
pick-up head.
DVDLD or
CDLD output
property?
Disc ID is correct?
Does spindle rotate?
Collector
voltage of power
transistor is OK?
(Q405, Q406)
Proper
RF signal on ES8380.
Proper
SPINDLE signal on
ES8380.
SPNP
SPNN output
properly?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No No
No
No
No
No
No
No
No