Technics SUA 909 Service Manual

Page 1

AD9907175A2

Service Manual

Stereo Control I Power Amplifier

SU-A909

Please file and use this manual together with the service manuals for
Model No. SU-C909U, Order No. AD990717GCZ and Model No.
SE-A909S, Order No. AD9907177CZ.

Colour

(K) .......... Black Type

Areas

(E) .......... Europe and Russia.

(EB) ........ Great Britain.

(EG) ........ Germany, France and Italy.
System: SU-A909

Control Amplifier ........... SU-C909U
Power Amplifier ............ SE-A909S

SU-CQOSU

Remote Control
Transmitter

SE-A9098

1

A WARNING

This service iniormation 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 prolessional 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.

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Technics®

1. Notes

- The SU-A909 consists of a Control Amplifier SU-C909U and a Power Amplifier

SE-A9098 contained in one and the same packing case.

So the new parts are those packed in and named below.

For information of others than those packed in, refer to both the SU-C909U
Service Manual and the SE-A9095 Service Manual.

- All parts are supplied by MESA.

2. Replacement Parts List

Rev. No. Part No. Part Name & Description Pcs. Remarks
P1 RPGS14 PACKING CASE 1 (E)

P1 RPG515 PACKING CASE 1 (EB.EG)

P2 RPQOSTB PAD 1

p3 RPQOSTI PAD 1 7

3. Packaging

Printed in Japan
F990704500HHIY I

1© 1999 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.

Page 10

VR403:
Tone control VR (TREBLE)

- Indicated voltage values are the standard values for the unit measured by the

DC electronic circuit tester (high-impedance) with the chassis taken as
standard. Therefore, there may exist some errors in the voltage values,
depending on the internal impedance of the DC circuit tester.

No mark : Power ON

- Important safety notice:

Components identified by A mark have special characteristics important for
safety.

Furthermore, special parts which have purposes of fire-retardant (resistors),
high-quality sound (capacitors), low-noise (resistors), etc. are used.

When replacing any of components, be sure to use only manufacturers
specified parts shown in the parts list.

- Caution!

IC and LSI are sensitive to static electricity.

Secondary trouble can be prevented by taking care during repair.
Cover the parts boxes made of plastics with aluminum foil.
Ground the soldering iron.

Put a conductive mat on the work table.

Do not touch the legs of IC or LSI with the fingers directly.

- Voltage and signal line

*

: Positive voltage line

II*II

: Negative voltage line

:>

: Phono signal line

->

: Tape rec signal line

6.2. Schematic Diagram

Page 56

SEASOSS

- Check the main ROB. as shown below.

Connect the lead wire,

N It
90"

Hook Hook
/ Remove the hooks

Power
transformer

Rear panel

Main P.C.Bt

I Main Component Replacement
Procedures

1. Replacement for the meter ass'y
- Follow the ~ of the item 1 in checking
@x 13 prooedurefor each P.C.B..
Claw
a th 5 t r Connector
Release the 2 claws, and than emove e connec o s. (CN704)
remove the rear panel. Connector

(0mm)

Release the hook.

Connector

(CNgog) Connector

Connector (CNSOG)
(CN801A/CN801 8)

Remove the meter assy.

Ste 4 Rem the an I
Raise the mam P.C.B.. n \ and $5,) 90396
a x 2
Step 2

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