Technics SU-X933 Service Manual

a CONTENTS
Page Page
SEFORE REPAIR 0.0.2.0 ccc c cece cence eee e teen en enees 2 PRINTED CIRCUITBOARDS ..................00000. 17~21
ROTECTION CIRCUITRY 0.0.2... 0 cc cece cece eee eens 2 TERMINAL GUIDE OF IC’S,
ICCESSORIES!. eA cetc korea etian ot Anette dite Aanad 2 TRANSISTORS AND DIODES .............0.00000 2000 24
OCATION OF CONTROLS .... 0.00... ccc cence een ence ees 3 WIRING CONNECTION DIAGRAM ..........0000 0000 eee e ee 22
SONNECTIONS 0.0... ccc cece eee eter cece eee e teens 4,5 DESCRIPTION OF FLPANEL ...............00. 000 eee e eee 23
ISASSEMBLY INSTRUCTIONS .............00 000: e eee ees 6~8 FUNCTIONS OF IC TERMINALS .............000.000000. 23, 24
SCHEMATIC DIAGRAM ......0 0.00.0 cece cece cece ee eee 9~14 REPLACEMENT PARTSLIST ..............000. 0000s 25~33
LOCK DIAGRAM 0.0... 0c ccc cc ccc eee ence eect eee e es 15,16 EXPLODED VIEW ...........0 ccc c cece cece cece cece 31,32
# BEFORE REPAIR
(1) Turn off the power supply. Using a 100, 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 110V 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
# 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.
ACCESSORIES
@AC power supply COP 2... eee cece renee e eens 1
Configuration of AC power supply cord differs according to area.
e@Attachment AC plug .......... 0. ccc eee ee eee eens 1
SJA190 .........- For (GN) area only. SJP9215...For (GC) area only
SJA188 .......... For (EB) area only.
RJAO004 ........ For (GC) area only.
SFDACO5E03_....For others.
m LOCATION OF CONTROLS
eFront panel
[1] Power switch (POWER)
[2] Voiume level/balance indicator
(BALANCE/VOLUME)
[3] Volume-level indicator
[4] Muting indicator (MUTING)
[5] Volume control (VOLUME)
[6] Input selectors/indicators
eRear panel
PLAY BACK
TAPE (REMOTE OUT)
TO DECK
REC ouT—
(REMOTE IN)
TO TUNER
EXT
LoutpuT —
TUNER GND
Audio muting switch (MUTING)
Balance controls (BALANCE)
[9] Tone controls (BASS/TREBLE)
Super bass control (SUPER BASS)
[11] Surround-sound switch (SURROUND)
[12] Headphones jack (PHONES)
COOLING FAN
[SURROUND - SOUND —
SPEAKERS
Co
~AC IN
TURNTABLE 4
SYNCHRO-REC
tei a
cD
SYNCHRO TAPE
VOLTAGE SELECTOR
(For (GC) area only)
TO DECK
(Except [EG] area)
*Phono input capacitance is about 270 pF for EG area
(about 100 pF for other areas).

Technics SU-X933 Specifications

General

Brand	Technics
Model	SU-X933
Category	Amplifier
Language	English