Technics SUV 2 X Service Manual

Page 2

I CONTENTS
Page

PROTECTION CIRCUITRY . ...................... CIRCUIT BOARDS AND WIRING CONNECTION
BEFORE REPAIR AND ADJUSTMENT . . . DIAGRAM . . . . . . . 9,10
LOCATION OF CONTROLS ......... . . . . . . . PRINTED CIRCUIT BOARDS . . I1~13
DISASSEMBLY INSTRUCTIONS . . . . . ............. 4~6 BLOCK DIAGRAM , 14,15
TERMINAL GUIDE OF TRANSISTORS. DIODES AND IC'S. . . . 6 SCHEMATIC DIAGRAM , . 16~20
FUNCTION OF TERMINAL RESISTORS & CAPACITORS . _ 21

Ics01 (Ico control) ............ 7 REPLACEMENT PARTS LIST. . . . . . . . . . . .22

2401 (Analog function control) ..... 8 EXPLODED VIEW ...................... 23, 24
I PROTECTION CIRCUITRY

The protection circuitry may have operated if either of if this occurs, follow the procedure outlines below:

the following conditions is noticed: 1. Turn off the power.

0 No sound is heard when the power is turned on. 2. Determine the cause of the problem and correct its

0 Sound stops during a performance. 3. Turn on the power once again.

The function of this circuitry is to prevent circuitry

damage if, for example, the positive and negative speaker Note

connection wires are "shorted", or if speaker systems When the protection circuitry functions, the unit will not

with an impedance less than the indicated rated im» operate unless the power is first turned off and then on

pedance of this unit is used. again.

I BEFORE REPAIR AND ADJUSTMENT

1. Disconnect AC power, Discharge both Power Supply Capacitors C701 and C702 (8200I1Fl through a 109, 5W resistor
to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may distroy solid state devices,
2. After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at 50/60Hz in NO SIGNAL mode should be shown below with respect to supply voltage iIOV/

120V/220V/24OV,
Power supply volt-go AC110V ACIZOV ACZZOV A0240V
Consumed current I 50/60Hz 180 ~400mA 170 ~360mA 90 ~ ZOOmA 80 ~180mA

I LOCATION OF CONTROLS

Operation indicator Balance control

Computer drive automatic indicator Audio muting switch i off ~+-20dBI

Power switch Loudness switch ( I off, .- on)

Volume control

Recording output
signal indicator
Input signal
. indicator
Headphones Jack phonol
(main) 9
Speaker selectors-l: tun '
(remote) CD)
Selectors
(hassl- video/aux
Tone oontrols-l
ItrebIe)-- tape 2]
Tone switch I I. defeat, - on) (tape 1/DAtape)
Subsonic filter switch 1 I. oif, .- on) Recording mode switch
Recording mode indicator