Teac EQA-220 - Service Manual

TEAC
EQA-220
Graphic
Equalizer
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SERVICE
MANUAL
EQA-220/EQA-110
Graphic Equalizer
NOTES
@ PC boards shown are viewed from parts side.
@ Parts marked with * require longer delivery time.
@ The parts with no reference number or no parts number in the
exploded views are not supplied.
@ As regards the resistors and capacitors, refer to the circuit
diagrams contained in this manual.
@ A\ Parts marked with this sign are safety critical components.
They must be replaced with identical components - refer to
the appropriate parts list and ensure exact replacement.
@ Parts of [ ] mark can be used only with the version designated.
[EX/T]: U.S.A. and GENERAL EXPORT [C]: CANADA
[GE]: GENERAL EXPORT [E]: EUROPE
Effective
:
March,
1993
570464300
$02

Summary

Product Specifications

EQA-220 Specifications

Detailed technical specifications for the TEAC EQA-220 graphic equalizer.

EQA-110 Specifications

Detailed technical specifications for the TEAC EQA-110 graphic equalizer.

PC Board Layouts and Parts

Main PCB Diagram

Diagram showing component layout for the Main Printed Circuit Board.

LED PCB Diagram (EQA-110)

Diagram showing component layout for the EQA-110 LED Printed Circuit Board.

Display PCB Diagram (EQA-220)

Diagram showing component layout for the EQA-220 Display Printed Circuit Board.

VR PCB L Diagram

Diagram showing component layout for the Left Volume/Rotary Potentiometer PCB.

VR PCB R Diagram

Diagram showing component layout for the Right Volume/Rotary Potentiometer PCB.

Exploded Assembly View

Circuit Diagrams and Block Functions

IC Block Diagram (BA6124)

Internal circuit structure and pinout for the BA6124 integrated circuit.

EQA-220 Functional Block Diagram

Overview of signal paths and operational modules within the EQA-220 unit.

EQA-110 Functional Block Diagram

Overview of signal paths and operational modules within the EQA-110 unit.

Detailed Schematics

EQA-220 Main PCB Schematic

Complete circuit diagram for the EQA-220 Main Printed Circuit Board.

EQA-110 Schematics (Main & LED PCBs)

Complete circuit diagrams for the EQA-110 Main and LED Printed Circuit Boards.

Teac EQA-220 Specifications

General

Type	Stereo Graphic Equalizer
Channels	2
Frequency Bands	10 per channel
Power Supply	120V AC, 60Hz
Total Harmonic Distortion	0.05%
Signal to Noise Ratio	90 dB
Input Sensitivity	150 mV
Input Impedance	50 kOhms
Output Impedance	1 kOhm
Gain	±12 dB
Frequency Bands (Specific)	1 kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz
Frequency Range	10 Hz to 50 kHz