Technics SUV 900 Service Manual

Page 2

SU-V900

Frequency response
PHONO MM RIAA standard curve
10.2 dB (20 Hz~20 kHz)
TUNER, CD, TAPE 1, TAPE 2, DAT
0.8 Hz~150 kHz (+0. -3 dB)
+0 dB. -0.2 dB (20 Hz~20 kHz)
0.8 Hz~150 kHz (+0, -3 dB)

+0 dB. -0.2 dB (20 HZ~20 kHz)

POWER AMP DIRECT

Tone controls

BASS 50 Hz, +10 dB, ~10 dB

TREBLE 20 kHz, + 10 dB, ~10 dB
Loudness control (volume at --30 d8) 50 Hz. +9 dB
Output voltage

TAPE 1, TAPE 2. DAT REC OUT 150 mV
Channel balance, CD 250 Hz~6,300 Hz :1 dB
Channel separation, CD 1 kHz 50 dB
I CONTENTS

Page

BEFORE REPAIR .......... . ............................................................. _ 2
PROTECTION CIRCUITRY ...... 2
ACCESSORY ................................................................... 2
FRONT PANEL CONTROLS AND FUNCTIONS ............. .......... 3
CONNECTIONS ...................................................................... 4~6
DISASSEMBLY INSTRUCTIONS........................................ 7_~13
MEASUREMENTS AND ADJUSTMENTS ........................... 13, 14
BLOCK DIAGRAM ..................................................................... 15

IBEFORE REPAIR

I GENERAL

Power consumption
Power supply

For Continental Europe and ER. Germany
AC 50 H2160 Hz, 220 V
AC 50 Hz/60 Hz. 240 V
430 x183 x 436 mm
(16-15116" X7-7/32" x 17-5132")
21 kg (46.2 lb.)

920 W

For Great Britain
Dimensions (W X_H x 0)

Weight

Notes:
1. Specifications are subject to change Without notice.
Weight and dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum

analyzer.

Page
TERMINAL GUIDE OF ICS, TRANSISTORS AND DIODES... 16
SCHEMATIC DIAGRAM ............................. . ................. 16~20
PRINTED CIRCUIT BOARDS ............................................ 21~26
WIRING CONNECTION DIAGRAM .......................................... 27
EXPLODED VIEW ..... ......... 28~30
REPLACEMENT PARTS LIST ..................... 31~34
PACKING ........................... . ................................... . .......... 3 2
la ESISTORS & CAPACITORS. ................................... 35, 36

(1) Turn off the power supply. Using a 100, SW resistor connect both ends of power supply capacitors
(0551A, 0552A, .12000uF) 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 controiier to make sure that the consumed current at 50Hz in NO SIGNAL mode

1 If AIXI

51-522mm be shown tie-low wish .ri;.«::.-;;>ec». to supply voltags \. rzuixx
Power supply voltage AC 220V {2. :17 review
Consumed current 50 Hz ; 110~430mA 'tOQA-vSQOmA
J

I PROTECTION C-IRCUITRY

The protection circuitry may have operated it either of the follow-
ing conditions is noticed:
0 No sound is heard when the power is switched ON
(The current drive indicator ol the operation indicator is not
illuminated.)
0 Sound stops during a performance
The function of this circuitry is to prevent circuitry damage it, for
example. the positive and negative speaker connection wires are

shorted". it speaker systems with an impedance less than the
0 AC power supply cord ................................. t
[ SF DACOSE03 ............................... (E). (56)]
8JA193 ..................................... (EB)

indicated rated impedance of this unit are used. or it DC
voltage appears in the output.

It this occurs, lollow the procedure outlined below:
t. Switch OFF the power.

,2. Determine the cause ol 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.

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