Technics SUX 999 Service Manual

Page 2

l CONTENTS

Page Page
BEFORE REPAIR ........................................ 2 DESCRIPTION OF FL PANEL ............................ 13
PROTECTION CIRCUITRY ... .. .. ....... 2 PRINTED CIRCUIT BOARDS ........................ 21 ~25
ACCESSORY ............... .. . 2 TERMINAL GUIDE OF IC'S.
LOCATION OF CONTROLS . .. . . .. . a TRANSISTORS AND DIODES .......................... 25
CONECTIONS ...................... 4.5 WIRING CONNECTION DIAGRAM . ....
DISASSEMBLY INSTRUCTIONS . ..... 6~8 FUNCTIONSOF IC TERMINALS . . ,
BLOCK DIAGRAM ........... ... . 10~12 RESISTORS AND CAPACITORS .
SCHEMATIC DIAGRAM .............................. 13~20 REPLACEMENT PARTS LIST . . .

EXPLODEDVIEW ........... 3....

l BEFORE REPAIR

(Turn off the power supply. Using a mo. 5W resistor connect both ends of power supply
capacitorslcmt,C702,6800pF) in order to discharge the voltage.

(2)Belore turning the power supply on , atter completion oI repair . slowly apply the primary voltage by using
a power supply voltage controller to make sure that the consumed current at 50Hz/60Hz in NO SIGNAL mode
should be shown below with respect to supply voltage 220V/240V.

Power supply voltage ACZZOV ACZAOV
Consumed current 50Hz 165 - 495mA 152 ~ 456mA
Consumed current 60Hz 158 - 474mA 146 ~ 437mA

I PROTECTION CIRCUITRY

The protection circuitry may have operated It either of the following conditions is noticed:
* No sound is heard when the power is switched ON.
* Sound stops during a pertormance.

The lunction of this circuitry is to prevent circuitry damage it. tor example, the positive and negative speaker
connection wires are shorted . or it speaker systems with an impedance less than the indicated rated
Impedance of this unit are used.

It 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 tunctions, the unit will not operate unless the power is first switched OFF and then
ON again.

I ACCESSORY

- AC power supply cord ....................................... 1
Configuration ol Ac power supply cord dltlers accordlng to
area.
SJA188 .......... For (EB) area only.

SFDACOSEOS . . . .For Olhsrs.

Page 8

Ref. No. Ref. No. Removal of the power IC and
9 Removal of the power transformer 1 O regulator transistor
Procedure 1 . Remove the 4 screws (o~o). Procedure 1 . Uneoider the power IC or regulator transistor.
1-+6-> 8-)9 2. Remove the flat cable (J700). 1->8->1 0 2. Remove the 3 screws (o~e).
0
Regulator 7/
transistor 4""
W
a Power IC .
eW %
OWhen mountlng the power IC or regulator
transistor.
Apply silicone compond (SZZOL15) to the rear
side ol power to or regulator transistor.
Ref. No. Removal of the fan motor 3. Insert a screwdriver at the root oi the cooling fan. Force it
11 out of the motor shaft.

4. Remove the motor cover by used (-3 screwdriver.

5. Remove the motor from the tan casing.

6. When mounting the motor fan, align the tan casing's
projection with the hole of the fan motor.

Procedure 1. Pull out the 1 connector (J207).
1_>11 2. Release the 3 claws.

Cooling fon

r' i _.
". p 5! .
4 \ I - .
0 \--
Fan case

Projection
Fun motor