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SERVICE MANUAL

®

Index

2
PROCON 400 Test Procedure
2
PROCON 750 Test Procedure
3
PROCON 950 Test Procedure
3
PROCON 1100 Test Procedure
4
PROCON 1250 Test Procedure
4
PROCON 1500 Test Procedure
5
PROCON 400 Schematic
6
PROCON 750 Schematic
7
PROCON 950 Schematic
8
PROCON 1100 Schematic
9
PROCON 1250 Schematic
10
PROCON 1500 Schematic
11

Notice

Service must be carried out by qualified personnel only. Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8W unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
Soldering point.
Male connector.
Female connector.
ATTENTION
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12
code 270266
¤
Phone +39(0)541/959511 - Fax +39(0)541/957404 - Internet: www.generalmusic.com
) omega symbol of resistance value is substituted by E.
Supply voltage.
Test point.
Flag joined with one or more flags
M/F faston connector.
with the same signal name inscribed.
Observe precautions when handling electrostatic sensitive devices.
Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
1 1 1 1 1

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Summarization of Contents

PROCON400 Test Procedures and Adjustments
Precautions and Safety
Safety guidelines and precautions before performing tests, including Earth insulation and capacitor discharge.
Visual Inspection Guidelines
Steps for visually inspecting the amplifier chassis, internal assembly, and wiring for damage or shorts.
Required Testing Equipment
List of essential equipment required for testing procedures, including audio generator and oscilloscope.
Test Setup Instructions
Instructions for connecting test equipment, setting potentiometers, and connecting input signals.
Power Supply Voltage Verification
Procedures to verify AC and DC supply voltages using a multimeter for proper operation.
Amplifier Channel Performance Check
Steps to test amplifier channels for signal integrity, distortion, and output levels.
Clip LED Calibration
Guide for adjusting clip indicator LEDs for proper signal clipping detection on the display board.
DC Offset Voltage Adjustment
Method for setting and verifying the DC offset voltage of amplifier channels within specified limits.
Bias Adjustment Information
Information stating no bias adjustment is necessary for this amplifier circuitry.
Troubleshooting Advices
General troubleshooting tips and recommendations for amplifier repair and component checking.
PROCON750 Test Procedures and Adjustments
Precautions and Safety
Safety guidelines and precautions before performing tests, including Earth insulation and capacitor discharge.
Visual Inspection Guidelines
Steps for visually inspecting the amplifier chassis, internal assembly, and wiring for damage or shorts.
Required Testing Equipment
List of essential equipment required for testing procedures, including audio generator and oscilloscope.
Test Setup Instructions
Instructions for connecting test equipment, setting potentiometers, and connecting input signals.
Power Supply Voltage Verification
Procedures to verify AC and DC supply voltages using a multimeter for proper operation.
Amplifier Channel Performance Check
Steps to test amplifier channels for signal integrity, distortion, and output levels.
Clip LED Calibration
Guide for adjusting clip indicator LEDs for proper signal clipping detection on the display board.
DC Offset Voltage Adjustment
Method for setting and verifying the DC offset voltage of amplifier channels within specified limits.
Bias Adjustment Information
Information stating no bias adjustment is necessary for this amplifier circuitry.
Troubleshooting Advices
General troubleshooting tips and recommendations for amplifier repair and component checking.
PROCON950 Test Procedures and Adjustments
Precautions and Safety
Safety guidelines and precautions before performing tests, including Earth insulation and capacitor discharge.
Visual Inspection Guidelines
Steps for visually inspecting the amplifier chassis, internal assembly, and wiring for damage or shorts.
Required Testing Equipment
List of essential equipment required for testing procedures, including audio generator and oscilloscope.
Test Setup Instructions
Instructions for connecting test equipment, setting potentiometers, and connecting input signals.
Power Supply Voltage Verification
Procedures to verify AC and DC supply voltages using a multimeter for proper operation.
Amplifier Channel Performance Check
Steps to test amplifier channels for signal integrity, distortion, and output levels.
Clip LED Calibration
Guide for adjusting clip indicator LEDs for proper signal clipping detection on the display board.
DC Offset Voltage Adjustment
Method for setting and verifying the DC offset voltage of amplifier channels within specified limits.
Bias Adjustment Information
Information regarding the possibility and procedure for bias adjustment if necessary.
Troubleshooting Advices
General troubleshooting tips and recommendations for amplifier repair and component checking.
PROCON1100 Test Procedures and Adjustments
Precautions and Safety
Safety guidelines and precautions before performing tests, including Earth insulation and capacitor discharge.
Visual Inspection Guidelines
Steps for visually inspecting the amplifier chassis, internal assembly, and wiring for damage or shorts.
Required Testing Equipment
List of essential equipment required for testing procedures, including audio generator and oscilloscope.
Test Setup Instructions
Instructions for connecting test equipment, setting potentiometers, and connecting input signals.
Power Supply Voltage Verification
Procedures to verify AC and DC supply voltages using a multimeter for proper operation.
Amplifier Channel Performance Check
Steps to test amplifier channels for signal integrity, distortion, and output levels.
Clip LED Calibration
Guide for adjusting clip indicator LEDs for proper signal clipping detection on the display board.
DC Offset Voltage Adjustment
Method for setting and verifying the DC offset voltage of amplifier channels within specified limits.
Bias Adjustment Information
Information regarding the possibility and procedure for bias adjustment if necessary.
Troubleshooting Advices
General troubleshooting tips and recommendations for amplifier repair and component checking.
PROCON1250 Test Procedures and Adjustments
Precautions and Safety
Safety guidelines and precautions before performing tests, including Earth insulation and capacitor discharge.
Visual Inspection Guidelines
Steps for visually inspecting the amplifier chassis, internal assembly, and wiring for damage or shorts.
Required Testing Equipment
List of essential equipment required for testing procedures, including audio generator and oscilloscope.
Test Setup Instructions
Instructions for connecting test equipment, setting potentiometers, and connecting input signals.
Power Supply Voltage Verification
Procedures to verify AC and DC supply voltages using a multimeter for proper operation.
Amplifier Channel Performance Check
Steps to test amplifier channels for signal integrity, distortion, and output levels.
Clip LED Calibration
Guide for adjusting clip indicator LEDs for proper signal clipping detection on the display board.
DC Offset Voltage Adjustment
Method for setting and verifying the DC offset voltage of amplifier channels within specified limits.
Bias Adjustment Information
Information regarding the possibility and procedure for bias adjustment if necessary.
Troubleshooting Advices
General troubleshooting tips and recommendations for amplifier repair and component checking.
PROCON1500 Test Procedures and Adjustments
Precautions and Safety
Safety guidelines and precautions before performing tests, including Earth insulation and capacitor discharge.
Visual Inspection Guidelines
Steps for visually inspecting the amplifier chassis, internal assembly, and wiring for damage or shorts.
Required Testing Equipment
List of essential equipment required for testing procedures, including audio generator and oscilloscope.
Test Setup Instructions
Instructions for connecting test equipment, setting potentiometers, and connecting input signals.
Power Supply Voltage Verification
Procedures to verify AC and DC supply voltages using a multimeter for proper operation.
Amplifier Channel Performance Check
Steps to test amplifier channels for signal integrity, distortion, and output levels.
Clip LED Calibration
Guide for adjusting clip indicator LEDs for proper signal clipping detection on the display board.
DC Offset Voltage Adjustment
Method for setting and verifying the DC offset voltage of amplifier channels within specified limits.
Bias Adjustment Information
Information regarding the possibility and procedure for bias adjustment if necessary.
Troubleshooting Advices
General troubleshooting tips and recommendations for amplifier repair and component checking.
Spare Part List
PROCON 400/750 Assembly Components
List of assembly components for PROCON 400 and 750 models, including mains cable and power switch.
PROCON 400/750 Input/Supply Board Components
Components for the input, protection, and supply board of PROCON 400/750, identified by board code.
PROCON 400/750 Amplifier Module Components
Components for the amplifier modules (HGB768013, HGB768014) of PROCON 400/750 models.
PROCON 950-1500 Assembly Components
List of assembly components for PROCON 950 to 1500 models, including transformers and fuses.
PROCON 950-1500 Volume Board Components
Components for the volume control board (HGB768001) of PROCON 950-1500 models.
PROCON 950-1500 Display Board Components
Components for the display board (HGB768002) of PROCON 950-1500 models.
PROCON 950-1500 Input/Supply Board Components
Components for the input, protection, and supply board (HGB768000) of PROCON 950-1500.
PROCON 950-1500 Amplifier Module Components
Components for the power amplifier modules (HGB768003-HGB768010) of PROCON 950-1500.
PROCON 950-1500 Soft Start Board Components
Components for the soft start board (768272) of PROCON 950-1500 models.

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