Technics SL-PJ27 - Page 30

SL-PJ27
SL-PJ27
Mi TROUBLESHOOTING GUIDE
SL-PJ27 Operation Sequence Check Sheet
Play Operation Sequence
Power on
(with no disc loaded)
PLAY key pressed.
Forced traverse return r Laser diode comes on.
|
|
Disc detection Focus pulls in.
I
|
| Stop { Spindle motor starts rotation.
|
p : I
Disc
loading
|
.
|
i Disc tray closed.
| | Traverse servo operation
| |
! |
| DSL (data slice) operation
NO, aetna = rea ee ce 40)
|
Focus
pulled
in.
1
Play
operation
-|
! ---—-—-—— 4 | PLL operation
| |
| Spindle motor starts rotation. |
| CLV servo operation
| (11T mode)
| Focus servo operation ;
I
I I
| Tracking servo operation | CLV servo operation
| | (phase compare mode)
! !
eee
|
!
1 TOC reading he | Data demodulator circuit
bo ie ee ee J | | operation
[ DSL (data slice) operation |
I |
|
F be Access control circuit
PLL operation operation
|
! CLV servo operation STOP key pressed.
| (11T mode)
|
|
|
| CLV servo operation
| (phase compare mode)
|
|
l
TOC data display
|
|
a.
(Operation Sequence Just After Power On)
Power On
(no disc loaded)
(TOC Read Operation-PLAY Operation)
Open/Close switch
pressed.
@ Microprocessor failure
(1C401)
@ Operation key switch failure
@ Tray open switch failure
@ Power supply failure:
¢ Voltage regulator (IC11,
Q11)
@ Microprocessor failure:
© 1C401
Has the tray opened
and stopped?
FL display came on?
Yes
Load a disc and press
the Open/Close switch.
@ Microprocessor failure
Has the tray closed (IC401)
and stopped?
@ Operation key switch failure
@ Tray close switch failure
Yes
@ Microprocessor failure:
© 10401
@ Loading motor driver failure:
© 1C403, Q401, 402, motor
@ Close switch failure
Tray closed?
@ Pickup failure:
e Laser diode
NO! @ Control system failure:
©1C101, Q101
® Microprocessor failure:
¢1C401
— Laser diode turn-on check method —
Remove the disc then close the tray,
and the laser diode will come on for
approx. 5 sec.
Laser diode came on?
Yes
@® Traverse control system
failure:
© 10102, traverse coil
*1C103, potentiometer
Does optical
pickup move toward
inner track?
@ Microprocessor failure:
¢1C401
@ Control system failure:
©1C101, 102
@ FO error amp. failure:
©1C101, 102, 103
@ Pickup failure:
¢ Focus coil
Does focus lens
make vertical
movements?
No
Yes
Stops after making focus pull-
in operation for approx. 5 sec.
@ Microprocessor failure:
© 1C401
NO} @ T.T. drive system failure:
© 10301, 403, Q353
© Q351, 352
Spindle motor
Spindle motor
Started rotation?
Yes®
‘liam oD aie es eh ke