Technics SUVX 600 Service Manual

Page 2

SU-VX600

I CONTENTS

BEFORE REPAIR AND ADJUSTMENT

PROTECTION CIRCUITRY 2
ACCESSORY ............ 2
LOCATION OF CONTROLS 3
CONNECTIONS ....................................... 4~6
DISASSEMBLY INSTRUCTIONS . 7~10

SCHEMATIC DIAGRAM .............................. 11~14

Page
PFIINTED CIRCUIT BOARDS ........................ 15~18
WIRING CONNECTION DIAGRAM . , . 19
BLOCK DIAGRAM .................... 20
MEASUREMENTS AND ADJUSTMENTS ... 21
REPLACEMENT PARTS LIST .................. . 22~24. 27
CABINET PARTS LOCATION . 25, 26
PACKAGING ...................................... 28

I BEFORE REPAIR AND ADJUSTMENT

(t) Turn off the power supply. Using a100,10 W resistor, shortcircuit both ends of power supply capacitors (0001 , C002, C705

and C706 ) in order to discharge the voltage.
(2) Before turning on the power switch of the unit.
A. Connect the voltage controller to the primary side.

B. Connect the AC ampere meter to the primary side or connect the DC voltage meter to the i8" circuit at the secondary

side.

C. Turn the VR of ICQ (VR451, VR452. VRSOt and VR502) to minimum (counterclockwise).
D. After setting the output to zero of the voltage controller, turn on the power switch of the unit.

And increase the output of voltage controller gradually.

Then, check carefully whetherthe current value of primary side become more than following value or whether the DC

voltage of secondary side is increasing slowly.

E. if the value of current is increasing unusually or the DC voltage is not increasing, lower the output level of voltage

controller immediately.

oThe current value of the primary side at no signal. (Confirm the power supply voltage of each area and provided voltage of

the unit.)

Power supply voltage AC 220 V

AC 230 V AC 240 V

50 Hz

Consumed current

90~370 mA

BONSBO mA 70~350 mA I

I PROTECTION CIRCUITRY

The protection circuitry of the amplifier may have operated il eitherof

the following conditions is noticed:

0N0 sound is heard when the power is turned on.

cSound stops during a performance.

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

I ACCESSORY

OAC power supply cords ..........

If this occurs, follow the procedure outlined below:

1. Turn off the power.

2. Determine the cause of the problem and correct it.
3. Turn on the power once again.

Note:
When the protection circuitry functions, the unit will not operate
unless the power is first turned off and then on again.

For (E), (EG) areas.
For (EB) area only.