Technics SE-C01 Stereo DC Power Amplifier & SH-C01 Power Supply Unit Service Manual
Order No. SD7902-1512
Product Overview
This document is the service manual for the Technics SE-C01 Stereo DC Power Amplifier and the accompanying SH-C01 Power Supply Unit. It provides detailed technical specifications, operational descriptions, troubleshooting guides, alignment procedures, and parts lists for servicing and maintaining these audio components.
The SE-C01 is a stereo DC power amplifier, and the SH-C01 is its dedicated power supply unit. Various model suffixes (D, DG, X, XA, XAL, XSW, XGH, XGF, XE, EB) indicate regional availability and specific features.
Technical Specifications
Amplifier Section
| Specification | Value (8Ω Load) |
|---|---|
| 20 Hz~20 kHz continuous power output (both channels driven) | 2 × 50W |
| 40 Hz~16 kHz continuous power output (both channels driven) | 2 × 50W |
| 1 kHz continuous power output (both channels driven) | 2 × 52W |
| Total harmonic distortion (rated power at 20 Hz~20 kHz) | 0.03% |
| Total harmonic distortion (rated power at 40 Hz~16 kHz) | 0.03% |
| Total harmonic distortion (rated power at 1 kHz) | 0.03% |
| Total harmonic distortion (half power at 20 Hz~20 kHz) | 0.015% |
| Total harmonic distortion (half power at 1 kHz) | 0.005% |
| Total harmonic distortion (-26 dB power at 1 kHz) | 0.03% |
| Total harmonic distortion (50 mW power at 1 kHz) | 0.05% |
| Intermodulation distortion (rated power at 60 Hz: 7 kHz=4:1, SMPTE) | 0.03% |
| Power bandwidth (both channels driven, -3 dB) | 5 Hz~30 kHz |
| Residual hum and noise | 0.1 mV (0.03 mV, IHF, A) |
| Damping factor | 50 |
Input Sensitivity and Impedance
| Specification | Value |
|---|---|
| S/N | 105 dB (115 dB, IHF, A) |
| Frequency response | 0~100 kHz, -1 dB |
| Frequency response (20 Hz~20 kHz) | +0 dB, -0.1 dB |
| Channel balance (250 Hz~6,300 Hz) | ±0.1 dB |
| Channel separation (1 kHz) | 68 dB |
| Headphones output level and impedance | 470 mV / 330Ω |
| Load impedance | 8Ω~16Ω |
General
| Specification | Value |
|---|---|
| Power consumption | 360W |
| Power supply | AC 50 Hz/60 Hz, 110V/120V/220V/240V |
| Dimensions (W x H x D) SE-C01 | 297 x 49 x 262 mm (11.7" x 1.9" x 10.3") |
| Dimensions (W x H x D) SH-C01 | 297 x 49 x 220 mm (11.7" x 1.9" x 8.7") |
| Weight SE-C01 | 3.1 kg (6.8 lb.) |
| Weight SH-C01 | 3.6 kg (7.9 lb.) |
Product Identification and Features
The SE-C01 is a Stereo DC Power Amplifier, and the SH-C01 is its associated Power Supply Unit. The manual details various regional versions of these products, indicated by suffixes such as (D), (DG), (X), (XA), (XAL), (XSW), (XGH), (XGF), (XE), and (EB), each with specific market availability.
The SE-C01 features a peak power meter and a power source switch. The SH-C01 houses the pulse switching power supply, including components like transformers, relays, and filters.
Internal Structure and Components
The SE-C01 amplifier unit contains driver circuits, a power amplifier, a speaker protection relay, and a meter circuit. The SH-C01 power supply unit includes a pulse switching power supply (DC to DC converter), switching transformer, relays, and line filters.
Detailed exploded views and printed circuit board wiring diagrams are provided for both units, illustrating the placement of components such as integrated circuits, transistors, diodes, coils, transformers, resistors, capacitors, fuses, relays, and switches.
Operational Principles
The manual explains the operation of the pulse switching power supply, including the role of voltage doubler rectification and bridge rectification for different input voltages. It details the switching circuit's function, driven by transistors and coils, to convert and regulate voltages for the power amplifier.
A Power ON-OFF muting circuit and a DC detector protection circuit are described, designed to prevent audible noise during power transitions and protect speakers from DC current damage, respectively.
Troubleshooting Guide
A troubleshooting section addresses common problems such as the peak-power meter indicator always illuminating, no sound when power is on, incorrect stereo imaging, reversed left/right channels, low-pitched noise (hum/buzz), no sound from one speaker, differing volume levels for sources, and sudden loss of sound.
For each problem, probable causes are listed, along with suggested remedies, including checking power cord connections, fuse replacement, verifying input selector settings, ensuring headphones are disconnected, correcting speaker wire polarity, and adjusting balance controls.
Alignment Instructions
Detailed alignment procedures are provided in English, German, and French. These instructions cover adjustments for DC unbalance voltage, idle current (ICQ) of power transistors, and the peak power meter indicator.
Specific adjustment points (VR101-VR106, VR401-VR402) and connection requirements for DC voltmeters and oscilloscopes are outlined.
Installation Example
Recommended installation configurations for the SE-C01, SH-C01, SU-C01 (pre-amplifier), and ST-C01 (tuner) are illustrated. It also warns against specific installation arrangements that may cause hum or adverse sound effects.
Parts Lists
Comprehensive replacement parts lists are included for both electric parts and accessories/packing parts. These lists detail part numbers, descriptions, and reference numbers for ordering components.
