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Pioneer SA-7800 Service Manual

Pioneer SA-7800
29 pages
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Pioneer SA-7800 Specifications

General IconGeneral
Power Output65 watts per channel into 8Ω (stereo)
Frequency Response5Hz to 100kHz
Input Sensitivity2.5mV (MM), 150mV (line)
Speaker Load Impedance4Ω to 16Ω
Dimensions420 x 150 x 376mm
Semiconductors4 x IC
Channel Separation60dB (line)

Summary

Specifications

Tone Control Specifications

Details on Bass, Treble, Subsonic Filter, Loudness, Hum, and Noise.

Front Panel Facilities

Power Switch and Indicator

Operation of the power switch and the power indicator lamp.

Loudness and Volume Controls

Controls for enhancing low frequencies at low volumes and overall sound level.

Bass and Treble Controls

Adjusts low and high frequency audio levels.

Circuit Descriptions

4.1 Phono Circuit

Covers RF interference filter and the equalizer amplifier stage.

4.2 Tone Controls

Details the 3-stage tone amplifier circuit.

4.3 Power Amplifier

Explains the power amplifier circuitry, including differential and pre-driver stages.

Drive Voltage Limiter

Describes the circuit preventing amplifier instability during overdriving.

NSA Circuit

Further explanation of the NSA circuit's operation to prevent power stage cut-off.

4.4 Indicator Circuit

Describes the fluorescent indicator tubes and their drive circuits.

4.5 Protection Circuit

Details the circuit protecting speakers from overload and DC voltage.

Muting Operation

Explains the muting function during power transitions.

Overload Detector

Describes the circuit that detects and responds to overload conditions.

DC Voltage Detector

Explains the detection of DC voltage in the output and its effect.

Adjustments

Idle Current Adjustment

Procedure for adjusting idle current in the power amplifier.

Output Indicator Adjustment

Steps to adjust the output power indicator levels.

Disassembly

Wooden Case Disassembly

Instructions for removing the wooden case.

Bottom Plate Removal

Steps for detaching the bottom plate.

Front Panel Disassembly

Instructions for removing the front panel components.

Parts Location

Front Panel Parts

Identifies parts on the front panel of the unit.

Exploded View

Component Exploded View

Detailed breakdown of unit components and their assembly.

Wooden Case Exploded View

Illustrates component assembly including the wooden case.

Schematic Diagrams, P.C. Board Patterns and Parts List

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