PROEL HPX2800 - User Manual

1
ServiceManual
HPXSeries

ApplicableModels:
HPX900
HPX1200
HPX2400
HPX2800


Summary

Block Diagram

HPX900; HPX1200 Block Diagram

HPX2400; HPX2800 Block Diagram

HPX900 Power Supply Analysis

HPX900 Amplified Part Analysis

HPX1200;2400;2800 Aux Power Supply Analysis

Malfunction Analysis on Aux Power Supply

Troubleshooting guide for auxiliary power supply malfunctions.

HPX1200;2400;2800 SMPS Control Circuit Analysis

Malfunction Analysis on SMPS Control Module Circuit

HPX1200 SMPS Malfunction Analysis

HPX1200 Amplified Part Malfunction Analysis

Malfunction Analysis on Amplified Part

Troubleshooting guide for HPX1200 amplified part malfunctions.

HPX2400;2800 SMPS Malfunction Analysis

Malfunction Analysis on SMPS

Troubleshooting guide for HPX2400/2800 SMPS malfunctions.

HPX2400;2800 Amplified Part Malfunction Analysis

HPX2400;2800 Malfunction Analysis on Amplifier

HPX900;1200;2400;2800 Input Board Analysis

Malfunction Analysis on Input Board

Overview

1. Function Description
2. Important Technical Specifications
   1. HPX900
   2. HPX1200
   3. HPX2400
   4. HPX2800
3. Usage Features
4. Maintenance Features

This document is a service manual for the Proel HPX Series power amplifiers, covering models HPX900, HPX1200, HPX2400, and HPX2800. It provides detailed technical specifications, block diagrams, signal flowcharts, and malfunction analysis for various parts of the amplifiers, including the power supply, amplified sections, auxiliary power supply, driving and protection modules, and input board.

Function Description

The Proel HPX Series are professional power amplifiers designed for audio amplification. They feature multiple channels (stereo, bridge, or parallel modes) and incorporate various protection circuits to ensure reliable operation. The amplifiers are equipped with input level controls, input sensitivity adjustments, and indicators for power, protection, clip, limit, and signal presence. They are designed to deliver power to loudspeakers across a range of impedances (8, 4, and 2 ohms, as well as 8 and 4 ohms in bridge mode).

Important Technical Specifications

The HPX Series amplifiers offer varying power outputs and features across the models:

HPX900

• Power Output: 200W (8 ohm), 300W (4 ohm), 450W (2 ohm), 400W (BRIDGE 8 ohm), 900W (BRIDGE 4 ohm).
• Output Stage: Class AB.
• Frequency Response: 20 Hz - 20 KHz (+0/-0.5 dB).
• Input Sensitivity: +2.3 dBu (nominal), +8.3 dBu (fixed gain).
• GAIN: 32 dB (nominal), 26 dB (fixed).
• Input Connectors: XLR M, 1/4" JACK, RCA.
• Impedance: 20 Kohm (balanced), 10 Kohm (unbalanced).
• Output Connectors: SPEAKON and Binding Post.
• Damping Factor: > 100.
• Slew Rate: > 20 V/uS.
• S/N Ratio (unweighted): > 85 dB.
• THD+N: < 0.1%.
• Cooling: Variable speed DC fan.
• Protections: AC low power, DC, thermal, short circuit, VHF, CLIP limiter.
• Mains Supply Voltage: 230 VAC (±10%) 50/60 Hz or 120VAC (±10%) 50/60 Hz.
• Maximum Consumption: 1450 VA.
• Rated Consumption: 200 VA.
• Standby Consumption: 50 VA.
• Dimensions (W x H x D): 483 x 89 x 335 mm (19" x 3.5" x 13.2", 2U rack).
• Weight: 6 Kg (13.2 lb).

HPX1200

• Power Output: 300W (8 ohm), 450W (4 ohm), 600W (2 ohm), 600W (BRIDGE 8 ohm), 1200W (BRIDGE 4 ohm).
• Output Stage: Class AB.
• Frequency Response: 20 Hz - 20 KHz (+0/-0.5 dB).
• Input Sensitivity: +1.0 dBu (nominal), +4.0 dBu (fixed gain).
• GAIN: 35 dB (nominal), 32 dB (fixed).
• Input Connectors: XLR M, 1/4" JACK, RCA.
• Impedance: 20 Kohm (balanced), 10 Kohm (unbalanced).
• Output Connectors: SPEAKON and Binding Post.
• Damping Factor: > 100.
• Slew Rate: > 20 V/uS.
• S/N Ratio (unweighted): > 86 dB.
• THD+N: < 0.1%.
• Cooling: Variable speed DC fan.
• Protections: AC low power, DC, thermal, short circuit, VHF, CLIP limiter.
• Mains Supply Voltage: 230 VAC (±10%) 50/60 Hz or 120VAC (±10%) 50/60 Hz.
• Maximum Consumption: 1850 VA.
• Rated Consumption: 250 VA.
• Standby Consumption: 65 VA.
• Dimensions (W x H x D): 483 x 89 x 395 mm (19" x 3.5" x 15.6", 2U rack).
• Weight: 6.9 Kg (15.2 lb).

HPX2400

• Power Output: 450W (8 ohm), 800W (4 ohm), 1200W (2 ohm), 900W (BRIDGE 8 ohm), 2400W (BRIDGE 4 ohm).
• Output Stage: Class H.
• Frequency Response: 20 Hz - 20 KHz (+0/-0.5 dB).
• Input Sensitivity: +0.8 dBu (nominal), +5.8 dBu (fixed gain).
• GAIN: 37 dB (nominal), 32 dB (fixed).
• Input Connectors: XLR M, 1/4" JACK, RCA.
• Impedance: 20 Kohm (balanced), 10 Kohm (unbalanced).
• Output Connectors: SPEAKON and Binding Post.
• Damping Factor: > 200.
• Slew Rate: > 20 V/uS.
• S/N Ratio (unweighted): > 90 dB.
• THD+N: < 0.1%.
• Cooling: Variable speed DC fan.
• Protections: AC low power, DC, thermal, short circuit, VHF, CLIP limiter.
• Mains Supply Voltage: 230 VAC (±10%) 50/60 Hz or 120VAC (±10%) 50/60 Hz.
• Maximum Consumption: 3550 VA.
• Rated Consumption: 450 VA.
• Standby Consumption: 65 VA.
• Dimensions (W x H x D): 483 x 89 x 395 mm (19" x 3.5" x 15.6", 2U rack).
• Weight: 9.2 Kg (20.3 lb).

HPX2800

• Power Output: 600W (8 ohm), 1000W (4 ohm), 1400W (2 ohm), 1200W (BRIDGE 8 ohm), 2800W (BRIDGE 4 ohm).
• Output Stage: Class H.
• Frequency Response: 20 Hz - 20 KHz (+0/-0.5 dB).
• Input Sensitivity: 0 dBu (nominal), +7.0 dBu (fixed gain).
• GAIN: 39 dB (nominal), 32 dB (fixed).
• Input Connectors: XLR M, 1/4" JACK, RCA.
• Impedance: 20 Kohm (balanced), 10 Kohm (unbalanced).
• Output Connectors: SPEAKON and Binding Post.
• Damping Factor: > 200.
• Slew Rate: > 20 V/uS.
• S/N Ratio (unweighted): > 91 dB.
• THD+N: < 0.1%.
• Cooling: Variable speed DC fan.
• Protections: AC low power, DC, thermal, short circuit, VHF, CLIP limiter.
• Mains Supply Voltage: 230 VAC (±10%) 50/60 Hz or 120VAC (±10%) 50/60 Hz.
• Maximum Consumption: 4120 VA.
• Rated Consumption: 600 VA.
• Standby Consumption: 65 VA.
• Dimensions (W x H x D): 483 x 89 x 395 mm (19" x 3.5" x 15.6", 2U rack).
• Weight: 9.2 Kg (20.3 lb).

Usage Features

The HPX Series amplifiers offer flexible control and monitoring options:

• Controls: INPUT LEVEL, INPUT SENSITIVITY, STEREO/BRIDGE/PARALLEL mode selection, LOW PASS NOTCH (LPN), and GND lift.
• LED Indicators: POWER, ON, PARALLEL, BRIDGE, PROTECT, CLIP, LIMIT, and SIGNAL. These indicators provide visual feedback on the amplifier's operational status and potential issues.
• Input/Output Flexibility: Multiple input connector types (XLR, 1/4" Jack, RCA) and output connectors (SPEAKON, Binding Post) allow for integration into various audio setups.
• Cooling: Variable speed DC fans ensure optimal operating temperatures and prevent overheating.
• Protection Circuits: Comprehensive protection features safeguard the amplifier and connected equipment from AC low power, DC faults, thermal overload, short circuits, VHF (Very High Frequency) oscillations, and signal clipping.

Maintenance Features

The service manual provides detailed guidance for troubleshooting and repairing common malfunctions:

• Safety Instructions: Emphasizes caution due to high internal voltages, the importance of reading manuals, and restricting maintenance to qualified personnel authorized by PROEL. It also warns against replacing key devices or adjusting potentiometers without authorization, as this can alter equipment parameters. Power must be cut off during repairs.
• Malfunction Analysis Tables: These tables systematically list common malfunctions for different amplifier sections (Power Supply, Amplified Part, Aux Power Supply Board, Driving & Protection Module Circuit, Input Board), their probable causes, and suggested repair actions.
  • Power Supply (SMPS) Malfunctions: Covers issues like burnt AC fuses (due to varistor or line filter short circuits), relay failure (NPTR1 thermistor burnt), output-stage circuit damage, and problems with the self-excited circuit (power switch transistors, zener diodes). It also addresses fan speed control issues, rectifier output problems (no ±15V or +24V output), and power supply protection activation.
  • Amplified Part Malfunctions: Details issues such as power supply protection (short circuits in output transistors, abnormal ±15V supply), amplifier protection (DC output), clip limit circuit failures, amplifier self-excitation, crossover distortion, and IC/5532 damage. It also covers overload/short-circuit protection, over-temperature protection, and DC protect circuit issues (relay not pulling in, shock sound on/off).
  • Aux Power Supply Board Malfunctions: Addresses issues where the STY LED is off, indicating the equipment is unavailable to start, and problems with the self-activated switch providing standby power.
  • SMPS CONTROL Circuit Malfunctions: Focuses on issues like the equipment being unavailable to start, protection function activation due to low impedance output, cyclic protection of the switch power, and delay start/over-voltage/low-voltage/over-current protection.
  • Input Board Malfunctions: Covers problems with the Stereo/Parallel/Bridge Switch Circuit (poor connection leading to no output or unbalanced output), Bass Boost Circuit (sound distortion), Sensitivity Switch Circuit (unbalanced output), Clip Limit Circuit (damage to photoelectrical coupler, incorrect VR1/VR2 values), and ±15V power supply imbalance (distortion, protection activation).
• Repairing Guides: Provides general repair guidelines, such as using a 100W-200W lamp in series with the DC/300V fuse when repairing SMPS boards to prevent further damage. It also advises disconnecting +VCC, -VCC when SMPS cannot start to isolate faults to the amplified part or SMPS itself. For amplifier repairs, it suggests using a lamp in series and notes that CH1 and CH2 circuits are identical for testing purposes.
• Special Notes: Includes warnings about potential changes to models without prior notice, encouraging users to contact PROEL for unresolved issues, and reiterating the importance of not replacing key devices that affect performance.

PROEL HPX2800 Specifications