Technics SL-P999 Service Manual

SL-P999
Mi TROUBLESHOOTING GUIDE
SL-P999 Operation Sequence Check Sheet
Play Operation Sequence
Power on
(with no disc loaded)
Forced traverse return
Disc detection
Disc loading
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Disc tray closed.
Laser diode comes on.
Focus pulled in.
Spindle motor starts rotation.
Focus servo operation
Tracking servo operation
Traverse servo operation
DSL (data slice) operation
PLL operation
CLV servo operation
(11T mode)
CLV servo operation
(phase compare mode)
TOC data display
PLAY key pressed.
Laser diode comes on.
Spindle motor starts rotation.
Focus servo operation
Traverse servo operation
DSL (data slice) operation
=
4 PLL operation
CLV servo operation
(11T mode)
CLV servo operation
(phase compare mode)
Data demodulator circuit
operation
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Access control circuit
operation
STOP key pressed.
(Operation Sequence Just After Power On)
(no disc loaded)
@ Power supply failure:
¢ Voltage regulator
e 1011, 52, 104, Q12, 14, 51,
FL display came on?
@ Microprocessor failure:
@ Microprocessor failure:
@ Loading motor driver failure:
¢ 1C403, Q453, 454, motor
@ Close switch failure
@ Traverse control system
ickup move t
pickup
oward
¢1C102,
traverse
coil
© 1C103, potentiometer
Stops after making focus pull-
in operation for approx. 5 sec.
SL-P999 SL-P999
(TOC Read Operation-PLAY Operation)
Open/Close switch
pressed.
@ Microprocessor failure
(10401, 601)
@ Operation key switch failure
@ Tray open switch failure
Has the tray opened
and stopped?
Yes
Load a disc and press
the Open/Close switch.
@ Microprocessor failure
(IC401)
Has the tray closed
and stopped?
@ Operation key switch failure
@ Tray close switch failure
Yes
@® Pickup failure:
® Laser diode
No] @ Control system failure:
©1C101, Q101
@ Microprocessor failure:
Laser diode came on?
¢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.
Yes
@ Microprocessor failure:
¢1C401
@ Controt system faiture:
©1101, 102
Does focus lens
make vertical
movements? @ FO error amp. failure:
© 1C101, 102, 103
@ Pickup failure:
¢ Focus coil
Yes
@ Microprocessor failure:
e1C401
No] @ T.T. drive system failure:
© (C301, 403, Q451, 452
© Q404
Spindle motor
started rotation?
Spindle motor
Yes
Focus servo locked?
Yes
Tracking servo locked?
Yes
Traverse servo
operation normal?
Yes
Has DSL circuit
entered the
Normal mode?
Yes
RF signal
amplitude regulated
at the output of
AGC circuit?
Yes

Technics SL-P999 Specifications

General

Brand	Technics
Model	SL-P999
Category	CD Player
Language	English