Pioneer GM-222 User Manual

6
GM-222
A
1
234
B
C
D
12
34
10/50
10/50
ISOLATOR PCB
MOTHER PCB
A
B
UC model only
SPEAKER INPUT LEVEL
+15 REGULATOR
-15
REGULATOR
SWITCHING REGULATOR
MUTE
C851, 852
UC : 100P
ES, EW : 470P
THERMO-DETECTION
L
R
R
L
AMP UNIT
Consists of
MOTHER PCB
ISOLATOR PCB
: AUDIO SIGNAL
SIGNAL ROUTE
3. SCHEMATIC DIAGRAM
Note: When ordering service parts, be sure to refer to "EXPLODED VIEWS AND PARTS LIST" or "ELECTRICAL PARTS
LIST".
A
B

Pioneer GM-222 Specifications

General

Channels	2
Impedance	4 Ohms
Frequency Response	20 Hz - 20 kHz
Signal-to-Noise Ratio	100 dB
THD at Rated Power	0.08%
Crossover Frequency	80 Hz

Summary

Safety Information and Precautions

UC Model Safety Notes

Safety guidelines specifically for the UC model amplifier.

General Safety Cautions

Important warnings and cautions for qualified technicians during repair.

Lead Solder Warning

Warning regarding lead in solder and necessary handling precautions.

Exploded Views and Parts Identification

Packing Section Parts List

List of parts associated with the product's packaging.

Exterior Component Identification

Diagram and identification of external components and their assembly.

Exterior Parts List

Detailed list of external parts with their corresponding part numbers.

Schematic Diagrams

Mother PCB Schematic

Schematic diagram for the main control board (Mother PCB).

Isolator PCB Schematic

Schematic diagram for the isolator board.

Signal Route Explanation

Explanation of audio signal routing within the amplifier.

PCB Connection Diagrams

Mother PCB Component Layout

Connection diagram showing component layout on the Mother PCB.

Isolator PCB Component Layout

Connection diagram showing component layout on the Isolator PCB.

Electrical Parts List

Chip Resistor and Capacitor Details

Details on chip resistors and chip capacitors used in the unit.

Miscellaneous Components List

List of miscellaneous electronic components and their part numbers.

Resistor Part Numbers

List of resistors with their circuit symbols and part numbers.

Capacitor Part Numbers

List of capacitors with their circuit symbols and part numbers.

Adjustment Procedures

No Adjustment Information

Notification that no adjustment information is available in this chapter.

General Information and Disassembly

Unit Disassembly Steps

Step-by-step instructions for disassembling the unit for servicing.

Removing Case and Panel

Procedure for removing the outer case and front panel of the amplifier.

Amp Unit Removal from Heat Sink

Procedure for detaching the amplifier unit from the heat sink.

Operation and Settings

Setting the Unit

Instructions for setting up and operating the amplifier unit.

Gain Control Adjustment

Explanation of how to adjust the gain control for optimal sound output.

Power Indicator Light

Description of the power indicator light and its function.

BFC Switch Operation

Explanation of the BFC switch for controlling beat frequency.

Connection Diagrams and Procedures

UC Model Connection Diagram

Connection diagram specific to the UC model amplifier.

ES and EW Models Connection Diagram

Connection diagram specific to the ES and EW models amplifier.

Remote Control Wire Connection

Instructions for connecting the blue remote control wire.

Power Terminal Connection

Procedure for connecting the power supply wires to the amplifier.

Speaker Terminal Connection

Guide for connecting speaker wires to the amplifier's output terminals.

Speaker Wire Connection Modes

Explains different speaker connection modes: stereo, mono, 3-channel.

Detailed Performance Specifications

Power Source and Grounding Details

Details about the required power source voltage and grounding system type.

Current Consumption and Fuse Rating

Specifies current consumption, average draw, and fuse rating.

Physical Dimensions and Weight

Physical dimensions and weight of the amplifier unit.

Power Output Ratings

Maximum and continuous power output ratings for different models.

Load Impedance and Frequency Response

Specifies allowable load impedance and frequency response range.

Signal-to-Noise Ratio and Distortion

Signal-to-noise ratio and total harmonic distortion specifications.

Channel Separation and Input Specs

Channel separation and input level/impedance requirements.