Teac BX-330 - 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

Summary

1 SPECIFICATIONS AND SERVICE DATA

1-1 Specifications

Technical performance parameters and operational data.

1-2 Service Data

Operational details and performance metrics.

2 VOLTAGE CONVERSION

2-1 Voltage Conversion Procedure

Steps for adjusting the unit's voltage settings.

3 PARTS LOCATION

3-1 BX-550 Component Identification

Visual guide to parts on the BX-550 unit.

3-2 BX-330 Component Identification

Visual guide to parts on the BX-330 unit.

4 ADJUSTMENTS

4-1 Pre-Adjustment Setup

Initial settings before performing calibration.

4-2 Mid-Point Potential Adjustment

DC offset calibration procedure.

4-3 Idling Current Adjustment

Setting bias current for amplifier stages.

4-4 Power Output Meter Adjustment

Calibration of output level indicators.

5 BLOCK AND LEVEL DIAGRAM

5-1 BX-550 Signal Flow Diagram

Schematic showing signal path and levels for BX-550.

5-2 BX-330 Signal Flow Diagram

Schematic showing signal path and levels for BX-330.

6 PARTS LOCATION AND PARTS LIST (BX-550)

6-1 Parts Location - Front View

Visual guide to front panel components.

6-2 Parts Location - Internal;Rear Views

Visual guide to internal and rear components.

7 PARTS LOCATION AND PARTS LIST (BX-330)

7-1 Parts Location - Front View

Visual guide to front panel components.

7-2 Parts Location - Internal;Rear Views

Visual guide to internal and rear components.

8 PC BOARDS AND PARTS LIST (BX-550)

8-1 Main PCB-104 Assy Parts

Detailed component list for the main PCB.

8-2 Tone Control & SW PCB Parts

Component lists for tone control and switch PCBs.

8-3 Other PCB Parts

Component lists for muting, input/output, and meter PCBs.

9 PC BOARDS AND PARTS LIST (BX-330)

9-1 Main PCB-103 Assy Parts

Detailed component list for the main PCB.

9-2 Tone Control & SW PCB Parts

Component lists for tone control and switch PCBs.

9-3 Other PCB Parts

Component lists for input/output and LED PCBs.

10 SEMICONDUCTOR ELECTRODES

10-1 Transistor and Diode Pinouts

Diagrams showing pin configurations for semiconductors.

11 INCLUDED ACCESSORIES

11-1 Owners Manuals

Information on included user manuals.

SCHEMATIC DIAGRAMS

12-1 BX-330 Schematic Diagram

Overall circuit schematic for the BX-330.

12-2 BX-550 Schematic Diagram

Overall circuit schematic for the BX-550.

Teac BX-330 Specifications

General

Type	Integrated Stereo Amplifier
Input Sensitivity	2.5mV (MM), 150mV (line)
Frequency Response	10Hz to 50kHz
Signal-to-Noise Ratio	85dB (line)
Speaker Load Impedance	8 ohms