Technics SL-PS740A - Page 15

SL-PS740A SL-PS740A |
(Operation Sequence Just After Power On) (TOC Read Operation-PLAY Operation)
PLAY key pressed. Power On Open/Close switch
(no disc loaded) pressed. @)
|
No] @ FO error amp. failure:
| 2 P
Focus servo locked? *1C6501,6504
| Focus pulls In. (1) Power supply fallure: () Microprocessor fallure
|
*
Voltage
regulator
(IC11,
Has
the
tray
opened
°
10401
| FL display came on? Q11~16, Q891~893) and stopped? @ Operation key switch failure
| Spindle motor starts rotation. °1C protector (ICP11, 12) @ Tray switch fallure
|
(2
Microprocessor
failure:
Yes
| 10401
|
| Pocus eervecperation Yes @® Microprocessor failure:
| °1C401
| Load a-discand @ Control system failure:
ial
s
i
press
No
| Racia) sone operavon the Open/Close switch. Radial servo locked? * 1C6501,6504 :
| \3) TR error amp. failure:
| _ °1C6501,6503,6504
|
DSL«(data
slice)
operation
@
Pickup
failure:
¢ Radial coil
So a 4
|
Play
operation
a
Yes
bes re 4 | PLL operation @ Microprocessor failure
Has the tray closed NO} « 1c401
| and stopped? @ Operation key switch fallure
| @ Tray switch failure
| CLV servo operation
(11T mode) HF (RF) Signal NO} 1, AGC circuit failure (RF Amp.)
| Yes present? *1C6501
| @ Microprocessor failure: — AGC circuit check method —
| CLV servo operation °1C401 Verify that HF signal amplitude at
| (phase compare mode) Tray closed? @ Loading motor driver failure: () Pickup failure: C305's lead is 1.0Vp-p~1.5Vp-p.
5 pl apest anh ¢ Laser diode Yes
(3)
Tray
switch
failure
Nol
¢
:
| Laser diode came on? @ Shee. opts
|
Data
demodulator
circuit
@®
Microprocessor
failure:
|
operation
°1C401
:
2
;
| ti DF/DAC circuit failure:
|
—
Laser
diode
turn-on
check
method
—
Audio
signal
*
10801
l Yes Riera seen close the tray, output present? 2 Pow Dees filter circuit
a Access control circuit and the sae diode will come on for failure: i
operation
Does
optical
@
Radial
control
system
BPP
ee
segues
failure: . @ Microprocessor failure:
ey pressed. :
* 1c401 Does focus lens No @ Control system failure: Yes
¢1C6501
@ FO error amp. failure:
* 1C6501, 1C6504
@ Pickup failure:
¢ Focus coil
make vertical
movements?
Play operation
Yes
Stops after making focus pull-
in operation for approx. 5 sec.
@ Microprocessor failure:
©1C401
@ T.T. drive system failure:
© 10301, 402, Q351,
Turntable motor
Spindle motor
started rotation?
Yes @)
-15- ; : -16-