Teac BX-550 User Manual

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TEAC.
SERVICE MANUAL
BX-550
High Speed DC Integrated Amplifier
BX-330
DC Integrated Amplifier
The BX-550B and the BX-330B have a black finish; otherwise, they are the same as the BX-550 and the BX-330.
CONTENTS
1. Specifications and service data... 1. 1 ee ce eee eee ee ee eee 2
2. Voltage conversion... we ce ee ee ee ee eee et ene 3
3: Main parts locations occ ice eee ee ee we ee eee eee eas 4
UO 0110030111 ae a ee Re ae 5
5. Block and level diagram 2... 1... ee ee ee ee nee 8
6. Parts location and parts list (BX-550) 2... . ee eee 10
7. Parts location and parts list (BX-330) . 2.0... 1 eee et ees 18
8. PC boards and parts list (BX-550) 2... ee eee eee 27
9. PC boards and parts list (BX-330) . 2... ee ee ee eee 34
CAUTION
AParts marked with this sign are safety critical components. They must always be replaced
with identical components - refer to the TEAC Parts List and ensure exact replacement.
Effective: October, 1980 5704007100
ol I

Teac BX-550 Specifications

General

Input Sensitivity	150mV (line)
Output	150mV (line)
Speaker Load Impedance	8Ω to 16Ω
Weight	9.3 kg
Power Output	50 W per channel into 8Ω (stereo)
Frequency Response	5Hz to 60kHz

Summary

Specifications and Service Data

Specifications

Detailed technical specifications for BX-550 and BX-330 models.

Service Data

Key performance parameters and test points for servicing.

Voltage Conversion

Voltage Conversion Procedure

Instructions for safely changing the unit's voltage setting.

Parts Location Overview

BX-550 Parts Location Diagrams

Visual guides identifying component locations on the BX-550.

BX-330 Parts Location Diagrams

Visual guides identifying component locations on the BX-330.

Adjustments

Before Adjustment Procedures

Initial settings required before performing calibration.

Mid-Point Potential Adjustment

Adjusting DC voltage at amplifier mid-points for optimal performance.

Idling Current Adjustment

Procedure for setting quiescent current in amplifier stages.

Power Output Meter Adjustment (BX-550)

Calibrating the power output meter on the BX-550 model.

LED Meter Adjustment (BX-330)

Calibrating the LED level meter on the BX-330 model.

Block and Level Diagrams

BX-550 Block and Level Diagram

Functional block diagram and signal flow for BX-550.

BX-330 Block and Level Diagram

Functional block diagram and signal flow for BX-330.

BX-550 Parts Location and List

Parts Location-1 (BX-550)

Visual guide for front panel component identification on BX-550.

Parts Location-2 (BX-550)

Visual guide for rear panel and internal component identification on BX-550.

Parts Location-3 (BX-550)

Visual guide for internal component identification on BX-550.

Parts Location-4 (BX-550)

Visual guide for internal component identification on BX-550.

Parts Location-5 (BX-550)

Visual guide for rear panel component identification on BX-550.

Parts Location-6 (BX-550)

Visual guide for internal component identification on BX-550.

Parts Location-7 (BX-550)

Visual guide for internal component identification on BX-550.

BX-330 Parts Location and List

Parts Location-1 (BX-330)

Visual guide for front panel component identification on BX-330.

Parts Location-2 (BX-330)

Visual guide for internal component identification on BX-330.

Parts Location-3 (BX-330)

Visual guide for internal component identification on BX-330.

Parts Location-4 (BX-330)

Visual guide for internal component identification on BX-330.

Parts Location-5 (BX-330)

Visual guide for internal component identification on BX-330.

Parts Location-6 (BX-330)

Visual guide for internal component identification on BX-330.

Assembling Hardware Coding List

Hardware Screw and Fastener Identification

Codes and types for screws, washers, and nuts used in assembly.

BX-550 PC Boards and Parts List

Main PCB-104 Assy (BX-550)

Component layout and parts for the BX-550 main board.

Tone Con Ampl PCB-105 Assy (BX-550)

Component layout and parts for BX-550 tone control amplifier board.

Tone Con Ampl PCB-106 Assy (BX-550)

Component layout and parts for BX-550 tone control amplifier board.

SW PCB-150 Assy (BX-550)

Component layout and parts for BX-550 switching PCB.

Meter Ampl PCB-111 Assy (BX-550)

Component layout and parts for BX-550 meter amplifier board.

Muting SW PCB Assy (BX-550)

Component layout and parts for BX-550 muting switch PCB.

In/Output PCB-118 Assy (BX-550)

Component layout and parts for BX-550 input/output PCB.

BX-330 PC Boards and Parts List

Main PCB-103 Assy (BX-330)

Component layout and parts for the BX-330 main board.

Tone Con Ampl PCB-104 Assy (BX-330)

Component layout and parts for BX-330 tone control amplifier board.

SW PCB-149 Assy (BX-330)

Component layout and parts for BX-330 switching PCB.

LED PCB-129 Assy (BX-330)

Component layout and parts for BX-330 LED display PCB.

LED PCB-130 Assy (BX-330)

Component layout and parts for BX-330 LED display PCB.

LED PCB-131 Assy (BX-330)

Component layout and parts for BX-330 LED display PCB.

VR PCB-122 Assy (BX-330)

Component layout and parts for BX-330 variable resistor PCB.

Semiconductor Electrodes

IC Pinouts and Transistor Diagrams

Visual representation of semiconductor pin configurations and connections.

Included Accessories

Owner's Manuals and Plugs

List of included accessories such as manuals and cables.

Schematic Diagrams

BX-330 Schematic Diagram

Detailed circuit schematic for the BX-330 amplifier.

BX-550 Schematic Diagram

Detailed circuit schematic for the BX-550 amplifier.