Demon PMA-1520AE Service Manual

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MODEL JP E3 E2 EK EA E1C E1K

PMA-1520AE

P P

INTEGRATED AMPLIFIER

Ver. 5

•

Please use this service manual with referring to the operating instructions without fail.

•

Some illustrations using in this service manual are slightly different from the actual set.

• For purposes of improvement, specications and design are subject to change without notice.

Please refer to the

MODIFICATION NOTICE.

e

SERVICE MANUAL

e

Questions and Answers:

C
Carolyn MedinaJul 27, 2025
How to troubleshoot a Demon PMA-1520AE that will not power on?
- J
  Jeremy AdamsJul 27, 2025
  If the Demon Amplifier power cannot be turned on, you should check the insertion of the 8U-110144-2 AC UNIT and the 8U-110145-1 ?-com UNIT. Also check whether power is being supplied to the coil of the standby transformer (T101), and inspect for a broken wire in the standby transformer (T101) or main transformer. A broken FUSE F-101, or malfunction of U301, U303, D313, Q318, S102 could also be the cause.
C
Crystal DiazAug 6, 2025
Why is the power indicator LED flashing red on my Demon PMA-1520AE Amplifier?
- V
  Victoria MartinezAug 6, 2025
  If your Demon Amplifier's power indicator LED is flashing red and the muting mode won't cancel, it could indicate damage to the power amplifier circuit or the temperature detection circuit.
A
Alejandro RodriguezAug 16, 2025
What to do if the Demon PMA-1520AE operates, but then power indicator LED flashes red?
- K
  katie68Aug 16, 2025
  If your Demon Amplifier operates, but then the power indicator LED flashes red, this could be due to a damaged power amplifier circuit or a damaged temperature detection circuit.

Demon PMA-1520AE Specifications

General

Type	Integrated Amplifier
Channels	2
Total Harmonic Distortion	0.05%
Frequency Response	10 Hz - 100 kHz
Weight	10 kg
Phono Input	Yes
Damping Factor	100
Input Impedance	47k ohms (Line)

Summary

Safety Precautions

General Servicing Cautions

Provides warnings and instructions for safe servicing and inspection of the unit.

Important Safety Parts

Highlights parts with special safety properties and the need for designated replacements.

Technical Notes and Handling

Semiconductor and Optical Unit Handling

Details precautions for handling sensitive components to prevent electrostatic discharge.

Technical Specifications

Performance Specifications

Lists detailed electrical and performance specifications for the amplifier.

Disassembly Procedures

Front Panel Assembly

Printed Wiring Board Removal

Covers removal of various PWBs like Power Amp, Input, U-COM, and REC Input.

Power Transformer and AC Unit

Adjustment Procedures

Idling Current Alignment

Explains how to perform and adjust the idling current for optimal performance.

Troubleshooting Guide

Power On Issues

Addresses problems where the unit does not power on or the indicator LED remains off.

No Sound Output

Covers troubleshooting steps for no sound or abnormal sound output when the unit is on.

Protection Mode Issues

Explains troubleshooting for protection mode activation indicated by LED flashing.

Schematic Diagrams

Part 1: Amplifier Power and Front

Presents the schematic for the amplifier power and front sections.

Part 2: Input and Tone Control

Part 3: U-COM Function

Printed Circuit Board Components

Power Amplifier PCB Components

Input UCOM PCB Components