Technics SEA 900 SM Mk2 Service Manual

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ORDER NO. A0970709902

Service Manual

Amplifier
s E-AQOOS M 2
su-ceooumz Colour
Remote Control (K) ------ B'aCk TYPE
Transmitter
Areas
(E) Europe.
(EB) Great Britain.

(EG) ...... Germany.

SE-ABOOSM2
System: SU-AQOODMZ
Because of unique lnterconnectlng cables, when a component Control amplifier SU-ceooUMz
requires service, send or bring in the entlre system. Power amplifier SE-Asoosmz
Specifications (ON 45 500)
20 Hz - 20 kHz continuoul power output I GENERAL
both channels driven 2 x 70 w (8 (2) Power supply
1 kHz continuous power out put For (E) and (EG) areas AC 50 Hz, 230 V
both channels driven (THD: 1 %) 2x85 W (8 Q) For (EB) area AC 50 Hz, 280 V - 240 V
2 x 120 W (4 9) Power consumption 285 W
63 Hz - 12.5 kHz continuous power ontput Dimensions (Wx H x D) 430 x 136 x 344 mm
both channels driven (THD: 0.7 36) 2x80 W (B Q) . Weight 9.8 kg
2 X 105 W (4 Q)
Total harmonic distortion (THD)
rated power at 20 Hz - 20 kHz 0.015 "/e (8 9) Notes:
intermodulation distortion 1. Specifications are subject to change without notice.
(50 Hz: 1 kHz = 4 z 1, SMPTE) 0.007 % (89) Weight and dimensions are approximate.
Reeldualhum and noise 0.3 mV 2. Total harmonic distortion is measured by the digital spectrum
Damping lactor 70 (8 n) analyzer.
35 (4 n)
Headphones output level/impedance 540 mV/330 (2
Load Impedance
A or B, Bi-WIFIING 4 S2 - 16 (Z
Aandaen-16t2
Input sensitivity/Impedance 1 V133 k9
SIN (rated power, 4 (2) 95 dB (110 dB. IHF '66)
Frequency response 5 Hz - 70 kHz (+0, -3 dB)

+0 dB, -o.5 dB (20 Hz - 20 kHz)

AWARNING
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.

©1997 Matsushita Electric Industrial Co. Ltd.

0
. All rights reserved. Unauthorized copying
e nlcs and distribution is a violation of law.

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SE-A9OOSM2

I Contents

Before Repair
Protection Circuitry
Accessories
Caution tor Ac Maine Lead
Connections .. .
Names at Paris
Operations
Operation Check and

Main Component Replacement Procedures
Measurements and Adjustments

I Before Repair

Schematic Diagram .............
Printed Circuit Board Diagram
Type Illustration of lC's, Trans:
Wiring Connection Diagram

Block Diagram . 23
Replacement Parts List (Electrical) 24, 25
Replacement Parts List (Resistors and Capacitors) 26. 27

Cabinet Parts Location
Replacement Parts List (Cabinet, Accessories and Packing)

(1)Turn oil the power supply. Using 5'10 9. 10 W resistor. connect both ends of power supply capacitors (0701, C702) in order to

discharge the voltage.

(2) Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage
controller to make sure that the consumed current at 50 Hz in N0 SIGNAL mode should be shown below with respect to supply

voltage 230 V1240 V.

Power supply voltage

ACZSOV, 50 Hz

AC 240 V, 50 Hz

Consumed current

160 mA - 320 mA

160-320

I Protection Circuitry

The protection circuitry may have operated if either at the following conditions is noticed:

I No sound is heard when the power is switched ON.
I Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, lor example, the positive and negative speaker connection wires are
shorted, or it speaker systems with an impedance less than the indicated rated impedance at this unit are used.

it this occurs, follow the procedure outlined below:
i . Switch OFF the power.

2. Determine the cause of the cause of the problem and correct it.

3. Switch ON the power once again.

Note:

When the protection circuitry functions, the unit will not operate unless the power is first switched OFF and then ON again.

I Accessories

I AC power supply cord
(E) and (EG) areas : (rumors-2K) 1

I Amplifier connection cable
(HJLSDOOt B10)

I Stereo connection cable
(SJP2276)

I Remote control transmitter
(FmK-SU225WH)

-l

I Batteries for remote control trarsmitter
1 (UM-4, AAA". F103) .
riots: These are ave a e on

CLIE-