Technics SL-PC25

M@ TROUBLESHOOTING FLOW CHART
PLAYBACK FLOW CHART
( Power switch ON }
Yes
Traverse servo circuit
1C-102
IC-103
Traverse coil
Speed position sensor
Power
switch
ON
®
Compulsory traverse return
operation
Does PU move
toward the inner
circumference?
FO (focus) lead-in operation
Spindle motor rotation mode
All display light-up e
FO (focus) loop servo operation
Mechanism reset operation ( ) P P
Power circuit
Q1, D6, IC1
System CPU
1C-401
TR (tracking) servo operation
Stop
“STANDBY”
illuminate
Does
“FL”
illuminate?
Open the dust cover TRV (traverse) servo operation
and place the disc
OSL (data slice) operation
“STANDBY”
illuminate
System
CPU
1C-401
Motor
M451
Switch
$451
Sensor
D451, D452
Is mechanism
reset operation
functioned?
PLL (phase loop lock) operation
Press the play key
CLV (11T mode) operation
The disc tray turns clockwise.
CLV (fine servo mode) operation
Disc ‘'1” clamp
DATA demodulation
Stop position, and
“STANDBY” is illuminate
Read the TOC and start “PLAY”
Access control circuit
Laser diode (LD ON) turned ON QReLeHON
ti
Press the stop key
Release the clamp
(The disc tray does not rotate.)
Stop “STANDBY?” illuminate
— 51 —
+S) Hd OF42)
Press the play key or DISC KEY
Play operation key
System CPU
1C-401
Does indicator
illuminate?
System CPU
1C-401
Drive IC
1C-404
Motor
M451
Switch
$451
Sensor
0451, D452
Is mechanism
activated?
Read the TOC, and play
operation start