Technics SUX 930 Service Manual

Page 2

I CONTENTS

BEFORE REPAIR ............................................
LOCATION OF CONTROLS AND FUNCTIONS
CONNECTIONS ............................
DISASSEMBLY INSTRUCTIONS
SCHEMATIC DIAGRAM ............
PRINTER CIRCUIT BOAR S .......................
TERMINAL GUIDE OF ICS,

TRANSISTORS AND DIODES .........................

I BEFORE REPAIR

............... 21

MEASUREMENTS AND ADJUSTMENTS
FUNCTIONS OF IC TERMINALS
EXPLODED VIEW ........
REPLACEMENT PARTS LIST ......
RESISTORS AND CAPACITORS.

Page
WIRING CONNECTION DIAGRAM ................................. 22,23
BLOCK DIAGRAM ...24,25

(1)Turn off the power supply. Using a 100, SW resistor connect both ends of power supply Capacitors
(C701,C702.3300uF) in order to discharge the voltage.
(2)8efore 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 SOHz/GOHZ in NO SIGNAL mode
should be shown below with respect to supply voltage 220V/240Vt

Power supply voltage AC220V ACZ40V
Consumed current 50Hz 105 ~ 215mA 100 ~ 210mA
Consumed current 60Hz 105 ~ 215mA 100 - 210mA

I LOCATION OF CONTROLS AND FUNCTIONS

Emplifier section

Power switch Tone controls

Volume/balance level indicators (VOLUMEIBALANCE)

(POWER) (BASS/TREBLE) These indicators usually show the volume level; when the balance
The bass control is for the low- control is pressed, however, the position ol balance level is displayed for
frequency sound range and the five seconds. after which the display returns again to indication of the
treble control is for the high- volume level.
frequency sound range. . _ _

Mutlng Indicator (MUTING)

(636%

--Vo|ume control
(VOLUME)

Super bass switch ._J
(SUPER BASS)

Low frequency sounds are reinforced
when this button is pressed,

Headphones jack (PHONES)

Input selectors/indicators
(INPUT SELECTOR)

These selectors are used to select the
sound source to be heard, such as a
disc, radio broadcasts, etc. The
corresponding input selector indicator
illuminates during operation to indicate
the selected sound source.

Muting switch (MUTING)
Press this swrtch when a disc is
being changed or to temporarily
reduce the volume level (approx.
1/t0).

Balance controls (BALANCE)

Page 5

I DISASSEMBLY INSTRUCTIONS

How to remove the power IC

Ref. No. How to remove the volume Ret. No.
6 P.C.B. 8 and regulator transrstor
Procedure 1. Remove the 2 knobs «I 9). Procedure 1. Unsolder the power IC or regulator
1->2~>5~>6 2. Remove the 2 nuts (9. 0). 1->2->5->8 transistor,

Ref. No. How to remove the power
3 supply P.C.B.
Procedure 1. Remove the1 screw (0).
14>24>3 2. Remove the power supply P.C.B. in the

direction of the arrow.
3. Remove the1 screw (9).
4. Remove the1 rivet (9).

Power supply P.C.B.

Flet. No. . Ref. No. How to remove the power
1 How to remove the cabinet 4 transformer
Procedure 1. Remove the 8 screws (o~e). Procedure 1. Remove the 4 screws (0'43)-
1 2. Remove the cabinet in the direction of 1a2->3->4
the arrow,
1
0 .
0
0K_
R f. N . .
e 5 ° How to remove the main P.C.B.
Ref. No. Procedure 1. Remove the 4 connectors (J301, J302,
2 How to remove the rear panel 1-.295 J30? J601).
2. Remove the flat cables (J502. J701,J901)
Procedure ORemove the 8 screws (o~0). 3_ Remove the 3 screws (0~9)-
1*2 4. Remove the rivet (o).
5

. Remove the main P.C.B. in the direction
of the arrow.

3. Remove the volume P.C.B. in the
direction of the arrow.

2. Remove the 4 screws (0~0).

Regulator
transistor

oWhen mounting the power It: or regulator transistor.
Apply silicone compond (SZZOL15) to the rear side of
power IC or regulator transistor.

Ref. No. How to remove the dolby NR
9 switch P.C.B.

How to remove the flat cable

4%

oPull out the flat cable while Flat
pressing the connector. / cable

Connector

3. Remove the 5 screws (6~0).
4. Remove the flat cable (J806, J807. J951
J971).

Procedure 1. Remove the 2 screws (0. 6).
1->9 2. Remove the1 connector (J601).

3. Remove the flat cable (J901).

Volume P.C.B.
Ref. No. How to remove the input Ref. No.
H wt remove the front anel
7 selector/volume P.C.B. 10 o o P
Procedure 1- Remove "91 knob (0) Procedure 1. Remove theascrews (o~e).
1->2-+5a6->7 2. Remove the1 nut (9). 1->2->5->10 2. Remove the front panel in the direction of

the arrow.