Technics SH 8046 Service manual

Page 2

I} CONTENTS
Page

SAFETY PRECAUTION ........................ 2
LOCATION OF CONTROLS .
OPERATION ............

DISPLAY . .. . .
EXAMPLES OF APPLICATIONS UTILIZING

THE SDI-3046 FUNCTIONS ............... 7
DISASSEMBLY INSTRUCTIONS . . . . t . . 8, 9
FUNCTION DE 2'5 ....................... ... 10 ~12
GRID AND SEGMENT OF FL DISPLAY TUBE ....... 12

I SAFETY PRE CAUTION

TERMINAL GUIDE OF IC'S, TRANSISTORS
AND DIODES . . . . . .
BLOCK DIAGRAM .....
SCHEMATIC DIAGRAM . . . . ..........
PRINTED CIRCUIT BOARDS AND
WIRING CONNECTION DIAGRAM. . . . . ...... .19 ~21
EXPLODED VIEW . . . .. ............. .
REPLACEMENT PARTS LIST ..... . . . ...........

(This "safety precaution" is applied only in U.S.A.)

1. Before servicing, unplug the power cord to prevent an electric shock. 'rrl
2. When replacing parts, use only manufacturers recommended components for safety.
3. Check the condition of the power cord. Replace if wear or damage is evident.

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

5. 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.

a 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 3M9
and 5.2Mfl to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to

all exposed parts. (Fig. B)
Note:

Antenna
terminal I

.

:
Expand 9
metal
part

Ohmmotar
(Fig.A)

Resistance = 3M9 -5.2 M9

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

Exposed
metal
part
Ohmmeter
(Fig. 8)

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 customer.