Pioneer sx 770 service manual

Page 1

PIONEER (U2

SOLID STATE
AM-FM STEREO RECEIVER

MODELSX-77O

CAUTION Before connecting the line cord to the wall socket, arefully read and
follow the instructions described below, to assure the safety of your
Unlt.
I This receiver is set for 240V operation when shippedt
If this unit is used in a different line-voltage area, read and follow
"LINE VOLTAGE SELECTION AND FUSE" on pagelt
Be sure that the line voltage setting on your unit agrees with the
line voltage in your area and that the fuse installed in yourunit
is a proper one.

INSTALLATION,
OPERATING AND SERVICE MANUAL

Including PARTS LIST, CIRCUIT DIAGRAMS AND MOUNTING TEMPLATE.

f fvw

PIONEER ELECTRONIC CORPORATION

Page 2

-PIONEER_

FEATURES

0 LOWNOISE FET IN FM SECTION

Coupled with the use of a low~noise FET, the FM section ls designed for a high sensitivity to obtain a sufficient signal-to-noise ratio.

o EXCELLENT SELECTIVITY

The IF amplifier stage uses a combination of e low-noise silicon transistor and e monolithic IC to attain an otcellent selectivity
characteristic.

0 MONOLITHIC IC FOR MPX SECTION
The MPX section is an IC for a stdale, wide frequency band and a sharp channel separation. A sufficient measure is taken against SCA
beat.

0 HIGHLY SENSITIVE AM TUNER

Due to the silicon transistor and ferrite antenna, the AM tuner hes a high and stmle sensitivity.

0 MICROPHONE TERMINAL FOR A VERSATILITY OF USE

input terminals include a magnetic-cartridge record player terminal and a microphone terminal. Output terminals include a center channel
terminal and a preamplifier terminal. Thus Model $X~770 can be used in various ways.

0 WELL DAMPED, CLEAR SOUND

. The output stage is e quasi-complementary SEPP circuit using silicon transistors Model SX-770 reproduces well-damped. clear stereo
l sound over a wide frequency range Itom has to trnble.

o VARIETY OF ACCESSORY CIRCUITS

Accessory circuits include an FM AFC circuit. muting circuit, high-cut filter. tape monitor, loudness contour Mitch, etc.

0 MOVE L APPEARANCE

In addition to the black panel, the numeral indication is enbossed on the dial plate according to the selected position. Also, the dial
pointer glows.

LINE VOLTAGE SELECTION AND FUSE

SWITCHING LINE VOLTAGE SETTING AND
FUSE

ln order to remove the fuse, turn the fuse cap located on the line
voltage selector switch in the direction indicated by an arrow.
Then remove the fuse plug from the unit. Put the fuse plug back
so that the proper line voltage markingean be seen through the

I
1 SOCKET
FUSE PLUG

cut in the edge of the plug. Whenever the set position of the

selector switch is changed, check the retlng of the fuse. A l FUSE

l-ampere fuse is to be used for either 220V or 240V operation FUSE

and a 2empere fuse for arty of 110V, 117v, or 130V operation. CAP Fig. 1

If the rating 01 the fuse is proper, install the fuse in the lose cap,
Take off the fuse cap by turning it wlth a coin, etc. in the
direction indicated by the arrow mark.

REPLACING OF FUSE

when the fuse is blown, remove the fuse rap and replace the fuse
with a new one.