Troubleshooting - Jvc Xl-V440Bk Service Manual

Troubleshooting
Shows the condition of each circuit from when the power
is switched on to when play can be started.
Is
TRACK
a
{at power ON)—>
TRACK
000.00
(after 8 sec.)
shown in the
L.C.D. display?
ts the disc platter
moved out by
pressing the
OPEN/CLOSE
button?
Can TOC be read
when a disc is load-
ed by pressing the
OPEN/CLOSE
button?
Is the first tune
played by pressing
the PLAY/PAUSE
button?
YES
Does sound come
out?
YES
Check general
operation.
Dose each opera-
tion button of the
front pane! function
correctly?
Is the L.C.D.
display normal?
YES
OK
Compiete
Is +5V output to YES
IC101 (ENN 044)?
Does the L.C.D.
display light
momentarily and
then go out?
To power supply
circuit section
Is nothing light?
Is part of the display
lit, is the display
abnormal or are the
commands from other
buttons ignored?
Check the L.C.D.
display on its own.
To reset circuit
section
To front circuit
section and loading
circuit section
To feed servo
section and focus
servo section
To tracking servo,
feed servo, spindle
servo, loading cir-
cuit and tracking
servo, PLL, auto
slicer circuits
To signal processing
section
Is the micro-
computer IC201
normal?
NO
{C201 defective
L.C.D. display
defective
(No.2930} 1-27
XL-V440BK