Technics SU-X301 Service Manual

SU-X101/SU-X301
m@ CONTENTS
Page Page
BEFORE:REPAIRE cc icce aco tnatrcacie cerita se susan sete aieesioeye 2 PRINTED: CIRCUIT BOARDS) 2068.52 323.h00c5 05 seamen 17~21
PROTECTION CIRCUITRY, cco dass enue coe careers 2 TERMINAL GUIDE OF IC’S,
ACCESSORIES: bas cotenpun acc ren ieee oct mete ince teaie 2 TRANSISTORS AND DIODES ..................0000c eee 21
LOCATION OF: CONTIROLS acy einen rae ecoee aen eae 3 WIRING CONNECTION DIAGRAM ................0000000e 22
CONNECTIONS cee so icccrsang re ee acisie mreiste gene ee aes ereuetere 4,5 DESGRIPTION'OF: FL. PANEL ican ote eens 23
DISASSEMBLY INSTRUCTIONS) 5.5.5¢ csc cee costs mois cacecne 6~8 FUNCTIONS OF IC TERMINALS ........... 00.0000 e ees 23, 24
SCHEMATIC DIAGRAM icc cionn scenic cemcawaaun 9~14 REPLACEMENT PARTS LIST
BLOCK DIAGRAM) aaiveitoncnen vere erence comes wei cinemas 15,16 (for SU-XTOM) Ma Saaese eer ne eres ae 25, 26, 29~31
EXPLODED VIEW! 2iesc tanta ie ein on ee eal etceoae 27, 28
@ BEFORE REPAIR
(1) Turn off the power supply. Using a 10Q, 5 W resistor connect both ends of power supply capacitors (C711, 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 Hz/60 Hz in NO SIGNAL mode should be shown below with
respect to supply voltage 110 V/127 V/220 V/240 V.
Power supply voltage AC 110 V AC 127V 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
m@ 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.
m ACCESSORIES
@AC powersupply cord! essiinns canes aceneeccusse enon 1 @Attachment AC plug) seis acim cinvaed sve ecewtern oaersaiee Steen ate 1
Configuration of AC power supply cord differs according to area.
SIAN ZS crys encerrs For (GN) area only. SJP9215...For (GC) area only
SJA18B skies aan For (EB) area only.
RJAO004 ........ For (GC) area only.
SFDACO5E03 ....For others.

Technics SU-X301 Specifications

General

Brand	Technics
Model	SU-X301
Category	Amplifier
Language	English