Technics SUV 909 Service Manual

Page 2

I CONTENTS

PRINTED CIRCUIT BOARDS .
FUNCTION OF TERMINAL . .
BLOCK DIAGRAM . .......

SAFETV PRECAUTION . . . ...... . . g
.4

, 4 SCHEMATIC DIAGRAM . . . .

4

7

3

LOCATION OF CONTROLS . . .
PROTECTION CIRCUITRY . . . . . . . . .
BEFORE REPAIR AND ADJUSTMENT . . . .
DISASSEMBLY INSTRUCTION . . . . .....
MEASUREMENTS AND ADJUSTMENTS

~ 7 RESISTORS 8t CAPACITORS

REPLACEMENT PARTS LIST .

ADJUSTMENTPOINTS............:.::::..:: EXPLODEDVIEW .......... ......... 37,38
CIRCUIT BOARDS AND WIRING CONNECTION
DIAGRAM .......... .......... ......9,10

I SAFETY PRECAUTION

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. 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 resistance test to
prevent the customer from being exposed to a shock hazard.

WPWN.

o INSULATION RESISTANCE TEST

1. 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 5.2MS'Z 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 \

-----U
0-.

Exposed Exposed /
metal metal
part part
Ohmmeter Ohmmeter
(Fig.A) (Fig.8)
Resistance = aim-5.2 M9 Resistance 2 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 customer.