Technics SUV 7 X Service Manual

Page 2

I VIDEO SECTION I GENERAL

(TV/AUX 1, VIDEO/AUX 2, TAPE ZNCR) »
Power consumption 670W

Output voltage (It 1V Input 15 ohms unbalanced) tiOJ Vp-p WW" WPPY
Mulmum InpuI voltage 1.5 VD-P For F.R. Germany AC 50Hz/eon, 220v
I
Input/output Impedance 75 ohms unba ancad Fm- others AC 5OHz/60Hz, iIOV/127VI220V/240V
Dllnenlions (WXHXD) 430 X 147 X 392 mm
Not": (16-15/16" X 5-25/32" X 15-13/32")
I Total harmonic distortion is measured by the digital spectrum M2 135 kg
analyzer (HP, 3045 system). (29.8 lb.)
' Specifications are subject to change without notice
Weight and dimensions shown are approximate,
I CONTENTS m
SAFETY PRECAUTION ............ TERMINAL GUIDE OF TRANSISTORS.
LOCATION OF CONTROLS ......... DIODES AND "3'5 . . . . . . . . . . . . . . . 12
AUDIO AND vmso SIGNAL TERMINAL. , _ HOW TO REPLACE IC'S (Small outline typo) . ............ 13
OPERATION .......... . . ..... . WIRING CONNECTION DIAGRAM . . , . . . . . .
RECORDING. . . ....... . .....

PRINTED CIRCUIT BOARDS . . . . . ...... . . .
MEASUREMENT AND ADJUSTMENTS , . . . . . . . . .

PROTECTION CIRCUITRV . . . . t . .

BEFORE REPAIR AND ADJUSTMENT ...... . . . . 7 BLOCK DIAGRAM . . . . ...... . . . ....... . .

DISASSEMBLY INSTRUCTIONS ......... . . . ..... 7~Io SCHEMATIC DIAGRAM . . . . ...... . . ...... . . zs~33
FUNCTION or TERMINAL IIC801:MN142IsTA) ...... 10,11 CIRCUITS To BE CHANGED AND THE AREAS .. .. ......34
FUNCTION OF TERMINAL (IC25I: Po7sosc043) ..... 11, 12 REPLACEMENT PARTS LIST ........... 35, 3s

EXPLODED VIEW .........

- SAFETY PRECAUTION Ithes "safety precaution " is applied only in USA.)

. Before servicing, unplug the power cord to prevent an EIBCIFlC shock.

. When replacing parts, use only manufacturers recommended Components for safety.

. Check the condition of the power cord. Replace if wear or damage Is evident.

. After servicing, be sure to restore the lead dress, insulation barriers, Insulation papers, shields, etc.

. Before returning the serviced equipment to the customer, be sure to make the following insulation resnstance test to
Dr9vent the customer from being exposed to a shock hazard

mtha

0 INSULATION RESISTANCE TEST

I. Unplug the power cord and short the two prongs of the plug With a jumper wire

2. Turn on the power switch.

,3, Measure the resistance value wnh ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. EqUIpment wrth antenna terminals should read between 3M9
and 5.2MS2 to all exposed parts. lFlg. Al Equipment Without antenna terminals should read approximately infinity to
all exposed parts. (Flgl B)

Note: Some exposed parts may be isolated from the chassis by desvgn. These will read infinity.

Antenna
terminal \

Exposed/ Exposed
metal metal
part part
Ohmmeter Ohmmeter
(Fig-Al (Fig. Bl
Resrstance=3MQ--5.2 M9 Resistance: Approx 00

4. If the measurement is outSIde the specified limits, there IS a possibility of a shock hazard. The equipment should be
repaired and rechecked before it ls returned to the customer.