Technics RSTR 474 Service Manual

Page 1

ORDER NO. AD951025iS5

Service Manual

Cassette Deck

SteregO$t3gluEl|:*gg:;Zfi)t:dD eck R S 'T R 4 7 4

* Colour
Du DOLBY B-C NR HX PRO (K) Black Type
Area
Suffix for
at Dolby noise reduction and HX Pro headroom extension Model No. Area COIOUI

manufactured under license from Dolby Laboratories

Licensing Corporation. HX Pro originated by Bang and (P) U-S-A-

Olulsen. DOLBY, the double-D symbol and HX PRO" (PC) Canada.

are trademarks of Dolby Laboratories Licensing

Corporation. (E) Europe (K)
Q94) 4 M 3/0 (jMD 0/5 (EB) Great Britain.

' 4 (EG) Germany and Italy.

at 94 3 3 Fee . , V ' "
Lou-rum) , came : s/c ecu/(f
Please file and use this supplement manual together with the service manual for Model No.

RS-TR474, Order No. AD9401007G5.

Notes: I This supplement manual is intended to provided additlcnal Information or corrections to the existing service manual for
model No. RS-TR474. Be sure to update your service manual for future reference.
0 Use this supplement for those sets with suffix "N" onward. (Refer to the following drawing.)

Serial Number

L Suffix N" or later

(REAR PANEL)

(9
©

®
(D [.20]

Serial Number
Sticking Position

A WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It
does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

° ® © 1995 Matsushita Electric industrial 00., Ltd.
ec 11105 All rights reserved. Unauthorized copying and

distribution is a violation of law.

Page 2

RS-TR474

I OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT PROCEDURES

1. This section describes procedures for checking the operation of the major printed circuit
boards and replacing the main components.

2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.

3. Select items from the following index when checks or replacement are required.
4. Illustrated screws are equivalent to actual size.

5. Refer the parts No. on the page of Main Component Replacement Procedures,
if necessary.

0 Contents
-Checklng Procedure for each P.C.B. Page.
1. Checking for the mechanism control P.C.B., FL P.C.B. and main P.C.B. - - . - . . ~ - - - - - - - - - - - - - - - . - - - - - - - 23.

Main Component Replacement Procedures

1.Replacementfortheheadblockandpinchrollerassy.------------~-------~-~-~~-H----H-----'- 3~8.
2. Replacement for the belt, reel motor unit and capstan motor unit. - - - - - - - - - - - - ' ° - - ' ' 0 - - - - ' ' - ' - - - - - - 8~10.
3. Replacement for the parts mounted on mechanism P.C.B. and solenoid unlt. - . - . - - - - - - ' ~ - - ~ - - - ~ - ' - ~ - - 10.11.

I Checking Procedure for each P.C.B.

1. Checking for the mechanism control P.C.B.,
FL P.C.B. and main P.C.B.

Remove the cabinet.

e'"
9x4

- Check the mechanism control P.C.B. (DECK1,
- DECK2) and FL P.C.B. as shown below.

-

-

Mechanism control P.C.B.
(DECK1)

FL P.C.B.

ems!!! a (Black)
X

[RHDaOOSS-K1]

For [P.PC] areas. @mm 0,0 (Black)
[XTBS3+8JFZ1]

Mechanism control P.C.B.
(DECK2)