Technics SU-X911 - Page 2

m@ CONTENTS
Page Page
BEFORE:REPAIR... 2.00 ce deceive teeta se ed iy ged 2 PRINTED CIRCUIT BOARDS ..............0.0.00..0.. 17~21
PROTECTION CIRCUITRY ..... 0.0.00 c ccc ee eee 2 TERMINAL GUIDE OF IC’S,
ACCESSORIES. wesc cictcaged oda de eee be thie nde eee bse 2 TRANSISTORS AND DIODES ...........0.0.0..0..00... 21
LOCATION OF CONTROLS ......... 000 ccc eee 3 WIRING CONNECTION DIAGRAM .........0.00..0.0..000008 22
CONNECTIONS iid co cae cee edie edo eee aa dda ae wis 4,5 DESCRIPTION OFFLPANEL ............... 0.000000 eee 23
DISASSEMBLY INSTRUCTIONS ................22.-000005 6~8 FUNCTIONS OF IC TERMINALS ...........0..0.000.0004 23, 24
SCHEMATIC DIAGRAM ..........0 0.00. c eee ees 9~14 REPLACEMENT PARTSLIST ..............000 0. cee 25~33
BLOCK DIAGRAM .......... 00.0 cece eee 15,16 EXPLODED VIEW ........... 0.000 31, 32
m@ BEFORE REPAIR
(1) Turn off the power supply. Using a 10Q, 5 W resistor connect both ends of power supply capacitors (C711, C712, 3300 pF) 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 ACi27v | ac220v | ac24ov |
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 power supply Cord 2.26... eee eee 1 @Attachment AC plug
Configuration of AC power supply cord differs according to area.
SJA190 .......... For (GN) area only. SJP9215...For (GC) area only
SJA188 0.0.2 .20.. For (EB) area only.
RJAOOO4 ........ For (GC) area only.
SFDACO5E03 ....For others.