Technics SL-P250 - Page 30

SL-P250 SL-P250
|
|
No
:
IS
ARF
SIGNAL
CONVERTED
BY
|
———=»
|
@.
Data
Slice
Circuit
————>
|
HOW
TO
CHECK
SRF
CIROUIT=
IS
FOCUS
LENS
MOVED
VERTI-
@.
Microprocessor
Circuit
:
DSL
CIRCUIT
TO
SRF
SIGNAL?
[C-501
(AN8371S)
oe.
oF
Signal)
at
Pin
CALLY
FOR
SERACH
OPERATION?
IC~401
_O4N1SSAPED)
.
["
. Servo Control Circuit
IC-101_(AN8370S)
Yes @. Focus Error Amplifier
1C-104, 106, (SVIBA4SS8FTD) No ——
Q141 (2901862) IS SRF SIGNAL SYNCHRONIZED | ———e | (@. Phase Loop Circuit R
Q142 (2881240) WITH PCK SIGNAL? IC-301 ON6617) @To check [C-501 pin 5 by
IC-501 «AN8371S) oscilloscope in triggered
Yes
. Optical Pick-up (SOAD70S) 0 n
oes ae ss mode with RF signal 7J301)
lone Repairable
No
DOES SPINDLE MOTOR ——— | ©. Microprocessor Circuit
START TO ROTATE? IC~601 4N152611)
[C401 (NISS4PEP)
Yes @. Turntable Drive Circuit No
IC-301 (4N6617) IS CLV SERVO CHANGED TO THE | ————=> | ©. CLV Circuit ————=) | =HOW TO CHECK PHASE COMPARISON
[C-402 (BA4558) PHASE-COMPARISON MODE? [C-301 (4N6617) @To epece ae tole at [c-301
pin signa
Q351 (UN4112)
Q403 (2SD1862) ["
0404 (2881240)
No
ARE
BOTH
EFM
AND
PCK
CLOCK
|
———=>]
@.
Phase
Loop
Lock
Circuit
———
|
=HOW
TO
CHECK
EFM
AND
PCK=
{
SIGNAL
APPEARED?
1C-501
(AN8371S)
Sie
nec
et
pin
3
for
.
waveform
@). DC Spindle Motor
@To check IC-501 pin 5 for
and if output wave from at
IC-501 pin 5 can be synch-
nized phasetically, the
peer IC-301 pin 78 become
<(SICDRF310T-2)
@. Focus Error Anplifier
IC-101 (AN8370S)
IC-104 (SVIBA4558FTID
Q141 (2801862)
Q142 (2881240)
PCK waveform .
[S AUDIO SIGNAL APPEARED?
IC-801 (N66Z3)
@. LPF Circuit
[C~803, 804 (LM833)
@. Microprocessor Circuit
401 O4N1554PEP)
1C-805 (SVIH8DN2175)
IC-806 (SVIH80N2175)
@. Servo Control Circuit
[C-101 (AN8370S)
©. Tracking Error Amplifier
IC-105 <SVIBA4558)
{C-106 (SVIBA4558FTI)
Q161 (2SD1862)
Q162 (2SB1240)
(4). Optical Pick-up (SOAD70S)
(5). Tracking Coil
Wone Repairable)
No
NOES
TRAVERSE
SERVO
OPERATE
|
———=?
|
©.
Microprocessor
Circuit
————=>
|
=HOW
TO
CHECK
THE
TRAVERSE=
CORRECTOLY? IC-401 QMN1SS4PEP) @The sound skip every few
;
@.
teatetee
be
hes
Creat
second
in
play
mode.
es = 16636 tical pick t
1o-168 on ; @Optical pick-up move to
O18] CoSp16eD outward of inward alter-
[NORMAL
OPERATION]
OPERATION
nately.
@Optical pick-up stick at
inner or outer position.
Q182 (2881240)
@. Traverse Coil (SORD38-)
Yes
No
TS DSL CIRCUIT IN NORMAL ———> | ©. Microprocessor Circuit —-> | HOW TO CHECK DSL CIRCUIT=
MODE? IC-401 NLSS4PEP) eshte crag tie pin 22
| ecome low
No
[S RF SIGNAL CONVERTED BY | ——-—-> | (@. Auto Gain Control Circuit | ————=* | =HOW TO CHECK ACC CIRCUIT=
THE
ACC
CIRCUIT
TO
ON
ARF
[C-501
(AN8371S)
@ihe
level
of
[C-501
pin
16
'
SIGNAL WITH A CONSTANT (ARF Signal) becom 0. 8Vp-p
AMPLITUDE?
ia
;
5
3
F
F
3
;
Pritted in Japan
—
53
—
:
54
H8930
7150AM/TK