Technics SUZ 25 Service Manual

Page 1

ORDER NO. SD8203214008

Service Manual

Stereo Integrated Amplifier

SU- 225

E] [EG] EK], EH] ],[Ei],
[EB], [EF] ][]XA [XL]

SUE- 225(K)

],[,[EG] [,[EH] [Ei]

Areas

[E] is available in Switzerland and Scandinavia,

* [E6] is available in F. R. Germany.

* [EK] is available in United Kingdom.

[EH] is available in Holland.

* [Ei] is available in ltaly.

* [EB] is available in Belgium.

* [EF] is available in France.

* [XA] is available in Southeast Asia. Oceania, Africa, Middle
Near East and Central South America.

* [X L] is available in Australia. J

tvpes.

[' The cabinet and front panel are available in black color and silver
' The black type model is provided with (K) in the Service Manual.

Specifications

(Specifications are subject to change without notice for further improvement.)

(DIN 45 500)

I AMPLIFIER SECTION .. . .
Input senstttvtty and Impedance

20 Hz~20 kHz continuous power output PHONO 2~5 mV/47kQ
both channels driven 2 X 25W (40) TUNER, AUX 150 mV/22kQ
2 x 25w (3Q) TAPE 150 mV/22kQ
40 ZN; kHz continuous power 0mm PHONO maximum input voltage (1 kHz, RMS) 150 mV
both channels driven 2 X 25W (40) 5/ N
2 X 25W (80) rated power (40)
PHONO 73 dB (IHF, A: 78 dB)
1 kHz continuous power output .
both channe|s driven 2 X 30W (4Q) TUNER, AUX, TAPE 86 dB (IHF, A, 97 dB)
2 X 30W (SO) *26 dB power (40)
Total harmonic distortion PHONO 65 dB
rated power at 20 Hz~2o kHz 0.05% (40) TUNER, AUX, TAPE 65 dB
003% I80) 50 mW power (40)
rated power at 40 Hz~16 kHz 0.05% (40) PHONO 62 dB
TUNER, AUX, TAPE 62 dB

003% (an)
0.01% (40)
0.005% (30)
0.03% (30)
0.005% (30)
0,01% (40)

rated power at 1 kHz

halt power at 20 Hz~20 kHz
half power at 1 kHz
-26 dB power at 1 kHz

Frequency response
PHONO

TUNER. AUX, TAPE
Tone controls

RIAA standard curve
iOB dB (30 Hz~15 kHz)
5 Hz~80 kHz (-3 dB)

50 mw power at 1 kHz 0,01% (40) BASS 50 Hz, +10 dB~ *10 dB

lntermodulatlon distortion TREBLE 20 kHZ. +10 dB~ -10 (13

rated power at 250 Hz: 8 kHz=4:1, 40 0.05% L°ud"ess 00""01 (volume at -30 dB) 50 Hz, +9 dB
rated power al 60 Hz: 7 kHz:4:1, SMPTE, an 0.03% Output Voltage

Power bandwidth REC OUT 150 mv

both channels driven, -3 dB 10 Hz~25 kHz (40) Chame' 3'3; AUX 25° 6300 Hz :1 dB

10 Hz~25 kHz (80) channel separation, AUX 1 kHz 50 dB

Residual hum and noise 0.5 mV Headphones output level and impedance 340 mV/SSOQ

Damping factor 20 (4Q), 40 (80) Load impedance 4Q~16Q

Matsushita Electric Trading 00., Ltd.
PO. Box 288. Central Osaka Japan

Technics

Page 2

I GENERAL

Power consumption 260W
Power supply AC 50 H2160 Hz, 220V
(For continental Europe)

AC 50 HZ/GO HZ, 240V

(For United Kingdom and Australia)

AC 50 Hz/SO HZ, 110V/120V/220V/240V

(For others)

Dimensions (WXHXD) 430 X 86 X 252 mm
(16»15/16" X 3-3/8 X 9-15/16")
4.8 kg

(10.6 lb.)

Weight

Note:
Total harmonic distortion is measured by the digital spectrum
analyzer (HP. 3045 system).

I CONTENTS
Page
LOCATION OF CONTROLS . . . . . . . ........... 2,3
DISASSEMBLY INSTRUCTIONS . . . . . . . . . 3,4
BLOCKDIAGRAM..... ................ ....5
CIRCUIT BOARD AND WIRING CONNECTION
DIAGRAM . . . ............... 6 ~ 8

I LOCATION OF CONTROLS
Tone (treble)-
controls-Cum)-

Power switch/
indicator

Balance control

- Loudness switch
( 1 off, - on)

Page
SCHEMATIC DIAGRAM ....... 9 ~ 12
REPLACEMENT PARTS LIST. . . . . . . . . . . . . 13
EXPLODED VIEWS ........ . . . . . . . . 14,15
RESISTORS AND CAPACITORS ------------------ 15

drew

Volume
control
V3 v

Headphones4
jack ,
Tape-monitor selector

( 1 source, - tape)

Speaker switch
( l off,- on)

Phono input

Tuner input

Aux input

(Play back)
Tape deck
(Rec out)

Ground

Speaker terminals

L (phono)-

(tuner)

Input selectors

(aux)

(Unswitched)
(Switched)

AC outlets
(For [XAlarea only)

(Right)

Voltage selector
(on the bottom board)

(For [XA] area only)

O The power supply for this unit varies depending upon the areas. Also, the parts used for power supply are different.
80, refer to the circuit diagram and the replacement parts list.
* 220V (50/60Hz) for continental Europe.
* 240V (50/60Hz) for United Kingdom and Australia.
* 110V/120V/220V/240V (50/60Hz) for other areas.
- [XA area] for other areas is provided with voltage selector and AC outlets.
* Phono input capacitance is about lSOpF.