Technics SUV 650 Service Manual

Page 2

I CONTENTS

SAFETY PRECAUTION
BEFORE REPAIR...
PROTECTION CIRC .
ACCESSORIES ...............
LOCATION OF CONTROLS
CONNECTIONS ..................
DISASSEMBLY INSTRUCTION
CIRCUIT BOARDS AND
WIRING CONECTION DIAGRAM

Page

SCHEMATIC DIAGRAM ............................................... 13 ~ 16
TERMINAL GUIDE OF ICS. '
TRANSISTORS AND DIODES ................
MEASUREMENTS AND ADJUSTMENTS.
BLOCK DIAGRAM.
EXPLODED V|EW..
REPLACEMENT PARTS LIST
RESISTORS AND CAPACITORS.

I SAFETY PRECAUTION (This safety precaution" ls applied only in U.S.A.)

monitor:

9 INSULATION RESISTANCE TEST

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

When replacing parts, use only manufacturer's recommended components for safety.

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

. After servicing, he 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 resistance test to
prevent the customer from being exposed to a shock ha'zard.

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 with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between SM]
and 5.2Msl to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to

all exposed parts. (Fig, B)

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

Antenna
terminal \

Exposed
metal
part

Ohmmeter

(FigA)

Resistance :3MQ--5.2M§2

Exposed 9
metal
part
Ohmmeter
(Fig. B)

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 is returned to the customers

I BEFORE REPAIR

(1) Turn off the power supply. Using a 10!), 10W resistor, connect both ends of power supply capcitors(C705,C706) in order to

discharg e 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 120V, 60Hz in N0 SIGNAL mode is 250mA ~ 500mA.