Technics RSCH 404 Service Manual

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ORDER NO. AD930721708

Service Manual

Cassette Deck

ST-CH505
or

Remote Control
Transmitter

SB-CH404

RS-CH404 SE-CH404

SB-CH4D4

Cassette Deck

RS-CH404

Colour
(K) BlackType

Because of unique interconnecting cables,
when a component requires service, send or

bring in the entire system.

Area
Suffix for
Model No. A'ea 00"
Europe, Asia,
Latin America,
(E) Middle Near East, (K)
Africa and Oceania .

I NEW MECHANISM (AR-1)

Specifications

Deck system Stereo cassette deck
Track system 4-track, 2-channel
Recording system AC bias
Erasing system AC erase
Tape speed 4.8 cm/sec.
Bias frequency 80 kHz
Heads

DECK 1 (playback head)
DECK 2 (recording/playback) Permalloy head
(erasure) Double gap ferrite head
Motors (capstan/reel table drive) DC servo motor
(reel table drive) DC motor
Wow and flutter 0.1% (WRMS)
Fast forward and rewind times Approx. 45 seconds
with 060 cassette tape

Frequency response (Dolby NR off, CCRT on)

Permalloy head

System: SC-CH404

S/N (CrOz) Signal level MOL
Dolby NR off 56 dB (A weighted)
Dolby B NR on 66 dB (CCIR)

Input sensitivity and impedance
LINE IN 126 mV/17.6 k0

Output voltage and impedance
LINE OUT 400 mV/ZZOQ

I General

Dimensions (WXHXD) 270x118.5><263 mm

Weight 2.85 kg

Notes:

1. Weights and dimensions shown are approximate.
2. Design and specifications are subject to change
without notice.

Dolby noise reduction manufactured under

NORMAL 20 H247 kHz license from Dolb Laboratories Licensin
30 HZ-15 kHZ (+0 dB, -7 dB, DIN) - Corporation y g

CrO; 20 Hz-t 8 kHz Dolby and the double-D symbol are trade
30 H24 7 kHZ (+0 dB, 7 dB, DIN) marks of Dolby Laboratories Licensing

METAL 20 HZ*20 kHz Corporation.
30 Hz-19 kHz (+0 dB, -7 dB, DIN)

System Tuner Compact disc player Amplifier Cassette deck Speakers
sc-crwm $32333: SL

Notes: For Europe and Oceania
For Asia, Latin America. Middle Near East and Africa
For Europe. ..Made in PAES

For Asia, Latin America, Middle Near East and Africa and 0ceania...Made in NABEL

Technics

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RS-CH404

I Contents
Page

ILOCATION OF CONTROLS ........................... 2
oDISASSEMBLY INSTRUCTIONS . .2~7
ISCHEMATIC DIAGRAM .............. . 8~14
OPRINTED CIRCUIT BOARD DIAGRAM ................ 15~18
oTERMINAL GUIDE OF IC'S, TRANSISTORS AND

DIODES .........................
OWIRING CONNECTION DIAGRAM .
NOTE:

Page
IMEASUREMENTS AND ADJUSTMENTS ............ 20~22
IBLOCK DIAGRAM ....................... . .t . 23, 24
oFUNCTION OF IC TERMINALS . ......... 25, 26
OREPLACEMENT PARTS LIST . . 27~30, 32, 33
oCABINET PARTS LOCATION ................. 31
OMECHANISM PARTS LOCATION . . . . . 34~37

Refer to the service manual for Model No. SE-CH404 (Order No. AD9307218C8) for information on
ACCESSORIES, STACKING THE COMPONENTS", CONNECTIONS and PACKAGING.

l Location of Controls

The functions indicated by the numbers with black background (for example 9) can also be activated from the remote control.

1 34 '6 a

No. Name

® Deck 1 cassette holder

(a) Deck 1 cassette holder open button
(5 OPEN)

@ Dolby noise reduction button and
indicators (DOLBY NR)

@ Reverse mode button and indicators
(REVERSE MODE)

No. Name

6 Deck 1/deck 2 select button and
indicators (DECK 1/2)

© Deck 1 cassette holder close button
(CLOSE)

0 Fast forwardlrewindltape program
sensor buttons [44 (T PS), (T PS) Db]

Deck 2 cassette holder close button
(CLOSE)

9 Record pause button and indicator
(REC PAUSE)

One-touch tape edit buttons
(NORMAL, HIGH)

® Deck 2 cassette holder open button
(A OPEN)

Q Playback buttons and indicators (<1, I>)
® Stop button (III)

CCRT button and indicator (CCRT)

69 Deck 2 cassette holder

l Disassembly Instructions

ATTENTION SERVICER

Some chassis components may have sharp edges Be careful when disassembling and servicing.

- Replacement of the Foot

1. Remove the 4 heat melted posts on the Bottom board
ass'y with a pair of nippers or similar tool.

2 To replace the foot (RKA0011A-2) on the Bottom board
assy melt the 4 posts with a soldering iron.

Heat melted posts

Foot

Bottom board ass'y Soldering iron

Foot
(RKA001 1 A2)

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