Teac BX-500 Service Manual

TEAC
SERVICE MANUAL
BX-300
High Speed DC Integrated Amplifier
BX-300
DC Integrated Amplifier
CONTENTS
1. Specifications and service data... 2.2... ee ee es 2
2. Parts WOCAtiON = 650 oS S0e Be aca Se ce ee a ee Stee ap ale a ae eS ee eae a ee 3
3. Adjustments and voltage conversion... 2.2... ee ee es 4
4. Block and level diagram 2... ee ee ee 6
5. Parts location and parts list (BX-500) 2.2... es 8
6. Parts location and parts list (BX-300) .. 2... 2. ee ee ee 14
7. PC boards and parts list (BX-500). 2... ee ee 20
8. PC boards and parts list (BX-300).. 2... ee ee 26
CAUTION
A. Parts 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: August, 1979 C-90019 5704001500

Teac BX-500 Specifications

General

Type	Integrated Stereo Amplifier
Input Sensitivity	2.5mV (MM), 150mV (line)
Output	150mV (line)
Tone Controls	Bass, Treble
Loudness Control	Yes
Frequency Response	10Hz to 50kHz
Total Harmonic Distortion	0.05%
Signal-to-Noise Ratio	76dB (MM), 90dB (line)
Speaker load impedance	4Ω to 16Ω
Inputs	Phono MM, Tuner, AUX, Tape
Outputs	Tape1, Tape2
Power Supply	AC 120V, 60Hz

Summary

Specifications and Service Data

Parts Location

Parts Location Diagram 1

Diagram showing component locations on the front panel.

Adjustments and Voltage Conversion

Before Adjustment Procedures

Initial setup steps before performing adjustments.

Mid-Point Potential Adjustment

Adjusting the DC voltmeter reading to zero.

Idling Current Adjustment

Adjusting the amplifier's bias current.

Power Output Meter Adjustment (BX-500)

Calibrating the power output meters on the BX-500 model.

Voltage Conversion (General Export)

Instructions for changing voltage settings on export models.

Block and Level Diagrams

Parts Location and Parts List (BX-500)

BX-500 Parts Location Diagram 1

Component identification on the front panel for BX-500.

BX-500 Parts Location Diagram 2

Component identification on the rear panel for BX-500.

BX-500 Parts Location Diagram 3

Component identification on the internal chassis for BX-500.

BX-500 Parts Location Diagram 4

Component identification on internal PCBs for BX-500.

BX-500 Parts Location Diagram 5

Component identification on rear connectors for BX-500.

Parts Location and Parts List (BX-300)

BX-300 Parts Location Diagram 1

Component identification on the front panel for BX-300.

BX-300 Parts Location Diagram 2

Component identification on the rear panel for BX-300.

BX-300 Parts Location Diagram 3

Component identification on the internal chassis for BX-300.

BX-300 Parts Location Diagram 4

Component identification on internal PCBs for BX-300.

BX-300 Parts Location Diagram 5

Component identification on rear connectors for BX-300.

PC Boards and Parts List (BX-500)

BX-500 Main PCB Assembly

Component listing and diagram for the main PCB.

BX-500 Tone Control Amplifier PCB

Component listing and diagram for the tone control amp PCB.

BX-500 Switch PCB Assembly

Component listing and diagram for the switch PCB.

BX-500 Volume PCB Assembly

Component listing and diagram for the volume control PCB.

BX-500 Input/Output PCB Assembly

Component listing and diagram for the I/O PCB.

BX-500 Meter Amplifier PCB Assembly

Component listing and diagram for the meter amplifier PCB.

PC Boards and Parts List (BX-300)

BX-300 Main PCB Assembly

Component listing and diagram for the main PCB.

BX-300 Tone Control Amplifier PCB

Component listing and diagram for the tone control amp PCB.

BX-300 Switch PCB Assembly

Component listing and diagram for the switch PCB.

BX-300 Input/Output PCB Assembly

Component listing and diagram for the I/O PCB.

Included Accessories

Assembling Hardware Coding List

Schematic Diagrams

BX-300 Schematic Diagram

Electrical circuit diagram for the BX-300 amplifier.

BX-500 Schematic Diagram

Electrical circuit diagram for the BX-500 amplifier.