Technics SUV 460 Service Manual

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I CONTENTS
Page

BEFORE REPAIR AND ADJUSTMENT ....................
PROTECTION CIRCUITRY ..............................
ACCESSORIES ........................................
LOCATION OF CONTROLS ,,,,,
DISASSEMBLY INSTRUCTIONS .
SCHEMATIC DIAGRAM ................. . . .
WIRING CONNECTION DIAGRAM ....................... 1

2
2
2
3
4
7
D

Page
PRINTED CIRCUIT BOARDS ............................ 11
TERMINAL GUIDE OF ICS,

TRANSISTORS AND DIODES .......................... 15
BLOCK DIAGRAM ................... 15
MEASUREMENTS AND ADJUSTMENTS . . 17
REPLACEMENT PARTS LIST ............ . . . 18
EXPLODED VIEW ...................................... 22

I BEFORE REPAIR AND ADJUSTMENT

(1) Turn off the power supply. Using a ton, 10W resistor. shortcircuit both ends of power supply capacitors

(C705,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 :B" circuit

of the secondary side.

0. Turn the VR of ICQ (VFl451 and VR452) to minimum (counterclockwise).

D. After setting the output to zero of the voltage contoller,turn on the power switch of the unit.

And increase the output of voltage controller gradually.

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

whether the DC voltage of secondary side is increasing slowly.

E. lithe value of current is increasing unusually or the DC voltage is not increasingJower the output

level of voltage contoller immediately.

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

voltage of the unit.)

I Power supply voltage Ac 110 V AC 120 V Ac 220 V AC 240 V
Consumed current 50 HZ 120~480 mA 110~441 mA SO~240 mA 55N220 mA
60 H2 114~456 mA 104~417 n'lA 56~227 mA 52~208 rnA

I PROTECTION CIRCUITRY

The protection circuitry of the amplifier may have
operated it either of the following conditions is noticed:
0 No sound is heard when the power is turned on.

0 Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage

if. for example, the positive and negative speaker

If this occurs, follow the procedure outlined below
1.Turn off the power.

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

Note:

connection wires are shorted , or If speaker systems with When the protection circuitry functions, the unit will not

an impedance less than the indicated rated impedance
of the amplifier are used.

I ACCESSORIES

0AC power supply cord ............................ 1
(SFDACO5EO3) .......... For (E), (E5) and (EG) areas.
(SJA193) .. For (EB) area only.
(RJA0004) . . , . . For (60) area only.

(SJA1 73) .............. For (G N) area only.

operate unless the power is first turned off and than
on again.

OAC plug adaptor .................................. 1
(SJP9215) .............. For (60) area mly-