Technics SUX 101 SUX 301 Service Manual

Page 2

X101/SU-X301

I CONTENTS
Page
BEFORE REPAIR PRINTED CIRCUIT BOARDS ........................ 17~21
PROTECTION CIRCUITRY .. . . 2 TERMINAL GUIDE OF ICS,
ACCESSORIES ........... . 2 TRANSISTORS AND DIODES ..... 21
LOCATION OF CONTROLS .. l . . 3 WIRING CONNECTION DIAGRAM .
CONNECTIONS ............... . 4. 5 DESCRIPTION OF FL PANEL . .
DISASSEMBLY INSTRUCTIONS . . .6~8 FUNCTIONS OF IC TERMINALS . . .
SCHEMATIC DIAGRAM .......... REPLACEMENT PARTS LIST
BLOCK DIAGRAM (for SU-X101) 25, 26, 29~31
EXPLODED VIEW ........... 27, 28
REPLACEMENT PARTS LIST (for - 301) ........... 32~36

I BEFORE REPAIR

(1) Turn off the power supply. Using a 100, 5 W resistor connect both ends of power supply capacitors (C71 1, C712, 3300 uF) 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 Hfl60 Hz in NO SIGNAL mode should be shown below with
respect to supply voltage 110 V/127 V/220 V/24o v.

Power supply voltage AC 110 V AC 127 V AC 220 V AC 240 V
Consumed current 50 Hz 100~500 mA 70~470 mA 50~250 mA 40~240 mA
Consumed current 60 Hz 97~476 mA 68~457 mA 49~244 mA 39~236 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 ON.
Sound 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 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 ON again.

I ACCESSORIES

OAC power supply cord
Configuration of AC power supply cord differs according to area.

1 OAttachment AC plug .................................... 1

SJAi 73 .......... For (GN) area only. SJP9215...For (GO) area only
SJAiBB .......... For (EB) area only.

RJA0004 ........ For (60) area only.

SFDACOSE03 . . . .For others.