Pioneer SX-5 Service Manual

cDrJroNEEr{
Shot/,n tn thb
photo
b Model
SX-7.
ORDER
NO.
ARP-047-O
COMPUTER
CONTROLLED
STEREO
RECEIVER
sx-7
sx-6
SX-s.SiX-EiL
SX-,QISX-4L
.
The AM tuner of
SX-4L
wave-band tuner with MW
LW
(long
wave).
and
SX-SL is a two
(medium
wave) and
Model
SX-7
(and
SX-6, SX-5 and SX-4)
are new
types of receivers featuring microcomputers for
easier
operation. The AM/FM tuner stages incorpo-
rate
quartz
PLL
synthesizers for high stability,
while the
power
amplifier stage is a non-switching
amplifier which
achieves class A
quality
with class
B efficiency
(not
included in the
SX-4
model).
PIoNEEF| ELECTFICINTC CCtFtFCtFtATtCtN
1
chome. Mesu.o ku. rokyo 153.
J5p5n
U.a. tfcritlaF
alaC?Flo|llca CC'FFC,;|AY|C|N
a5 orro.d o. ve. Moonach e. New Je.sey
O7O74,
t)S A
FlONaaE
aL:ClFlC,l\IC
ll(rFC'PC' N.V. Lu thasen Haven
I
2O3O A..we.p
Berg'um
FroNaatl
an.actFctNlca aua?FAl-ra ETY.
LYo.
1 7a
1Ba
Bound ro. s 31
95.
aust.6r,€
F H
O
AUG.1981
Printed
in
lapan

Pioneer SX-5 Specifications

General

Brand	Pioneer
Model	SX-5
Category	Receiver
Language	English

Summary

CIRCUIT DESCRIPTIONS

Outline of Main Stage

General overview of the receiver's main operational stages and their composition.

Tuner Stage

Details the FM and AM tuning circuitry, including RF amplification and PLL synthesis.

AM/FM Synthesizer Stage

Explains the pulse-swallow PLL system for improved FM reception S/N ratio.

Amplifier Stage

Covers the equalizer amplifier, non-switching power amplifier, and output stages.

Display Stage

Describes the various LED displays for frequency, volume, and indicators.

Other Terminals

Explains the function of various control pins and indicators.

Memory Hold

Describes the auxiliary power circuit for preserving microcomputer memory contents.

Power Supply Sequence for Inhibit Mode

Details the sequence for switching to inhibit mode for power saving.

Control Stage

Synthesizer Control

Details the microcomputer-based control system for tuning.

Function Selector Control

Explains the key matrix for function selector operation.

Volume Control

Details the electronic volume and balance control functions.