Technics SUA 600 Service Manual

Page 2

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I CC NTENTS

Page
OBEFORE REPAIR ...................................... 2
oPFtOTECTION CIRCUITRY 2
OACCESSORIES ............... * ........... 2
oCAUTION FOR AC MAINS LEAD . . .......... 3
CLOCATION OF CONTROLS 4
OCONNECTIONS .............. . 5~7
IDISASSEMBLY INSTRUCTIONS . . ...... 7~10
IHOW TO CHECK THE MAIN P.C.B. ............ 10
IHOW T0 REPLACE THE POWER IC .................... 11

I BEFORE REPAIR

' Page
'SCHEMATIC DIAGRAM .............. 12~18
OPRINTED CIRCUIT BOARD DIAGRAM 19~22
IWIRING CONNECTION DIAGRAM . . . . 23
OBLOCK DIAGRAM .............. 24
DFUNCTION OF [C TERMINALS ....... 25
OREPLACEMENT PARTS LIST . 26~23, 31 , 32
OCABINET PARTS LOCATION . . . . ......... 29, 30
OPACKAGING .,. .' ...................................... 32

(1) Turn off the power supply. Using a 100, 10 W resistor, oonnect both ends of power supply capacitois (C701 , 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 50/60 Hz in N0 SIGNAL mode is mode should be shown below With respectto supply voltage 230 V/240 V.

Power supply voltage AC 230 V AC 240 V

AC110~127V

AC 220~24o v

Consumed current 50 Hz

60~300 mA 50~290 mA

1oo~500 mA sd~290 mA

I PROTECTION CIRCUITRY

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

No sound is heard when the power is switched 0N.
Sound stops during a performance.

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

If this occurs, follow the procedure outlined below:
1. Switch OFF the power.
2 Determine 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 0N again.

I ACCESSORIES

.......................... 1

OAC power supply cord . . . .
(VJA0733) For (EB) area

I Power plug adaptor . .~ ................................ 1
(SJP5213-2) For ((30) area

(FtJA0036-K) For (GN) area

Check the packing carton for these acoessbrles.

(FlJA0019-2K)
For (E), (E6), (E0), (EP), ((30) areas

I