Troubleshooting; No.ma041)1 - JVC KW-XC939 Service Manual

5.1 Flow of functional operation untill TOC read (CD)
When the pickup correctly moves
to the inner area of the disc
$83
Microprocessor
commands
FMO
TC94A14FA" 40"
FEED MOTOR
+TERMINAL
IC681"4"
REST SW
When correctly focused
FEO
TA2157" 15"
Focus Servo Loop ON o
SECTION 5

TROUBLESHOOTING

Set Function CD
v
$82 $81
3.3V
Hi-Z
0V
Pickup feed to the inner area
6V
4V
2V
OFF
ON
2.2V
RF signal eye-pattern n
remains closed
Tracking loop closed
RF signal eye-pattern
opens
Jump to the first track
Power ON
Disc inserted
YES
Laser emitted
"No disc"
Focus search
display
YES
Disc rotates
Microprocessor
commands
DMO
TC94A14FA"41"
TOC read out
Play
When the laser diode correctly
emits
$84
Microprocessor
commands
SEL
TC94A14FA"38"
LD
CN601"10"
When the disc correctly rotates
$84 $86 $ A200
Spindle
motor(-)
IC681"7"
Rough
Acceleration Servo CLV
Servo
0.5 Sec 0.5 Sec
Tracking Servo Loop ON
RF signal
Rough Servo Mode v
CLV Servo Mode
(Program Area)
CLV Servo Mode
(Lead-In Area;
Digital :0)
3.3V
0V
4V
0V
3.3V
2.2V
0V
6V
3.2
2V

(No.MA041)1-41