Technics RSCH 950 Service Manual

Page 1

ORDER NO. AD9211384CB

Service Manual

Cassette Deck [mm

Cassette Deck

RS-Cll-l950

SB-CHQSO SB-CH950 Colour
; (K) .......... Black Type
SL-CH950 SH-CHSSO Area
Suffix for
Model No. Area Colour
Europe, Asia,
Latin America,
(E) Middle Near East, I (K)
Africa and Oceania
Remote Control RSvCH950 SA-CH95D System: SC-CH950
Transmitter
Because of unique interconnecting cables, when a component
requires service, send or bring in the entire system.
I RS-TR165 MECHANISM SERIES (AR300)
SPECIFICATIONS
Deck system Stereo cassette deck SIN (CrO: type tape)
Track system 4-track, 2channel Dolby NR off 56 dB (A-WTD)
Recordlng system AC bias Dolby B NR on 66 dB (CCIR)
Erasing system AC erase Dolby C NR on 74 dB (CCIR)
Tape speed 4.8 cm/sec. (17/3 ips)
Bias trequlncy 80 kHz I General
Heads Dimensions (WXHXD) 27ox1 19 x 262 mm
DECK 1 (playback) Permalloy head Welght 3.3 kg
DECK 2 (record/playback) Permalloy head
(erasure) Double gap territe head
Motors DC servo motor Notes:

Wow and flutter
Fast forward and rewind time

0.1 % (WRMS)
Approx. 1 10 seconds

with C-GO cassette tape

Frequency response (When Dolby NR OFF, CORT ON)

1 . Specifications are subject to change without notice.
2. Weight and dimensions shown are approximate.

NORMAL 20 Hz-17 kHz
30 Hz-1 5 kHz (DIN) Dolby noise reduction and HX Pro headroom extension
cm)2 20 Hz-18 kHz manufactured under license from Dolby Laboratories
so Hz-1 7 kHz (DIN) Licensing Corporation. HX Pro originated by Bang & Olufsen.
METAL 20 Hz_2o kHz DOLBY, the double-D symbol UL] and HX PRO are
30 Hz-1 9 kHz (DIN) trademarks of Dolby Laboratories Licensing Corporation.
System Sound processor Tuner amplifier Compact disc player Cassette deck Speakers
SC-CHQSO SH-CHQSO SAACHSSO SL-CH950 RS-CHQSO 'SB-CH950

Technics

Europe...Made in PAES

Page 2

RS-CH950

I CONTE NTS

. Page
ILOCATIONOF CONTROLS .................. , ......... 2, a
oDISAsssMaLv INSTRUCTIONS ........................ a~9
-MEASUREMENTS AND ADJUSTMENTS . . 10~12
ISCHEMATIC DIAGRAM .............. 13N19
.PRINTED CIRCUIT BOARD DIAGRAM. . . . 20~22
oWIRINe CONNECTION DIAGRAM ...................... 23
NOTE:

Page
OBLOCK DIAGRAM .................................... 24, 25
.FUNCTION OF IC TERMINALS ........................ 26,27
OREPLACEMENT PARTS LIST 28~31, 34, 35
.CABINET PARTS LOCATION ...... . . t 32, 33
OMECHANISM PARTS LOCATION ............ 36~39

Refer to the service manual for Model No. SA-CH950 (Order No. AD921138008) for information on
ACCESSORIES, STACKING THE COMPONENTS", CONNECTIONS" and PACKAGING.

II LOCATION OF CONTROLS

The functions indicated by the numbers with black background (for example 0) can also activated from the remote control.

0 Deck 1 tast-forward/rewind/tape program sen-
sor (TPS) buttons
[44 (TPS) DV]
' *Press to advance or rewind the tape, or to quickly search for
the beginning of a program while the tape isbeing played.

(9 Dolby noise reduction button

(DOLBY NR)
Press to reduce hissing noise on the tape. This system has
both the Dolby B-type and Dolby C-type noise reduction.

® Reverse mode select button and indicators
(REVERSE MODE)

Press to select the reverse mode (for playback and recording).

@ Deck 1 counter reset button

(COUNTER RESET 1)
Press to reset the tape counter indicator to 0000.

(5) Deck 2 counter reset button
(COUNTER RESET 2)

© One-touch tape edit buttons (NOR, HIGH)
Press to start the tape

0 Deck 2 fast-torward/rewind/tape program sen-
sor (TPS) buttons [<4 (TPS) Db]

CCRT (computer control record tuning) but-
ton (CCRT)
Press to adjust the recording level, equalizer and bias before
recording.

Record pause button ( )
Press to put deck 2 into the record standby mode.

Deck 1 reverse-side playback button (<1)
Press to start the playback in the reverse direction.

Deck 1 forward-side playback button (l>)
Press to start the playback in the fomard direction.

@999

Deck 1 stop/cassette holder open button
(I/A)
Press to stop the tape or open the cassette holder.

@

Deck 2 stop/cassette holder open button
(l/A)

6

Deck 2 reverse-side playback button ( Press to start the playback or recording in the forward di-
rection.

® Deck 2 forward-side playback button (I>)
Press to start the playback or recording in the reverse di-
rection.

Page 13

RS-CH950 RS-CH950 ns-cu-Isso
I MECHANISM PARTS LOCATION oDECK 1

1 I _3 I 3 I 4 I 5 I 6 I 7 I 8 I 9 I
Ref. No. Part No. Part Name & Description . . Part Name 8: Description
152A
ZA 2A ASS Y
087A ING
442A 1le mm A
102'1
8023 ZA
132 123
+6], 451A -
VJ WZA
121B
«88 1323
121A B
BZC
(7P) B51420
472A
ISA PARTS 52A
(RICA /P1AYBACK) '-
082A
ass Y(P. B) 7 10271
IS 18028
ASS Y 72 C
RING +EL
ASSY N
[NE
TABLE(R) ASS Y ' 83
TABLE(F) ASS"! _
D
INCH ROLLERW) A85!
1 m
INCH ROLLEMF) ASS'Y
4020
121) "'
ZD
N
422A
1052A E
441A
397A
312A ' Note:
UEUUIFIZA " _ When changing mechanism parts, apply ma
specliied grease to areas marked XX"as i ' .
W101»1 PLATE shown Inlhe drawmg. V . ¥
3611501420 SPAEEH Ref. I
R955 9277.6 GEAR No. Part Name Pan I40.
monam FLY VMEELG) ASS'Y F
RHWIRBZA 0 FLOIL AK-152 SZZOL18
lWUDBflZA FLY WEELH?) Ag Y FLOIL
mum G9 GP-501A RZZOL09
moonnam m Y "' (9 FLOIL 947P RzzoL 02