EasyManua.ls Logo

Pioneer SX-1250 Service Manual

Pioneer SX-1250
48 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image
AM
/FM
STEREO RECEIVER
sx-l?50
<ART,158-0>
77i
<,
"
- ^-C r
lif
f
'
rl
(v)proNEER

Other manuals for Pioneer SX-1250

Question and Answer IconNeed help?

Do you have a question about the Pioneer SX-1250 and is the answer not in the manual?

Pioneer SX-1250 Specifications

General IconGeneral
Total Harmonic Distortion0.1%
Tuning RangeFM, MW
Input Sensitivity2.5mV (MM), 150mV (line)
Speaker Load Impedance4Ω to 16Ω
TypeStereo Receiver
Year Introduced1976
Power Output160 W per channel into 8Ω (stereo)
Signal to Noise Ratio90dB (line)
Semiconductors45 x diodes

Summary

1. SPECIFICATIONS

Performance Specifications

Covers power output, distortion, sensitivity, frequency response, S/N ratio, etc.

2. FRONT PANEL FACILITIES

Input Source and Audio Controls

Controls for AM, FM, PHONO, AUX, tape, Volume, Muting, Loudness.

Front Panel Controls

Speaker, Headphone, Tone, and Filter Controls

Speaker selection, headphone jack, tone, filter, bass/treble controls.

Tuning and Operation Controls

Tuning, Muting, and Audio Adjustments

Tuning knob, FM Muting, Multipath, Volume, Balance controls.

3. CONNECTION DIAGRAM

Antenna and Audio Connections

Diagrams for connecting antennas, turntables, tape players, and speakers.

4. CIRCUIT DESCRIPTIONS

FM Tuner Circuitry

Description of FM Front End and IF Section circuitry.

Multiplex Decoder Circuitry

Multiplex Decoder Operation

Explanation of PLL, stereo detector, and demodulator circuits.

4.2 AUDIO SECTION

Equalizer Amplifier and Tape Circuits

Description of equalizer amp and tape monitor/duplicate circuits.

Filter and Power Amplifier Circuits

Filter and Power Amplifier Stages

Description of active filters and the power amplifier section.

4.3 PROTECTION CIRCUIT

Relay Driver and Detector Circuits

Circuits for relay drive, overload, and center point detection.

4.4 POWER SUPPLY CIRCUIT

Power Supply and Inrush Suppression

Regulated power supply and inrush current suppressor circuit.

6. BLOCK DIAGRAM

Tuner and EQ Amplifier Block Diagrams

Block diagrams for tuner and equalizer amplifier sections.

7. DISASSEMBLY

Top and Bottom Plate Removal

Instructions for removing the top and bottom plates.

Front Panel Disassembly

Front Panel Component Removal

Steps to remove the front panel and its knobs.

8. PARTS LOCATION

Front Panel Parts Identification

Identification of knobs and switches on the front panel.

8.2 REAR PANEL VIEW

Rear Panel Terminal Identification

Identification of rear panel input/output terminals and holders.

9. ADJUSTMENTS

AM Tuner Alignment Procedure

Step-by-step procedure for tuning the AM section.

FM Tuner and Multiplex Adjustments

FM Tuner Alignment Steps

Procedures for aligning the FM front end and tuner assembly.

Power Amplifier and Stabilizer Adjustments

Power Amplifier Bias and Voltage Adjustments

Procedures for adjusting bias and voltage in the power amplifier.

10. DIAL CORD STRINGING

Dial Cord Installation Procedure

Step-by-step guide for stringing the dial cord.

11. EXPLODED VIEWS

Fastener Nomenclature

List and shapes of screws, washers, and nuts used.

Exploded View: Front Assembly

Front Panel Parts Layout

Exploded view of the front panel, knobs, and associated parts.

Related product manuals