Akai AT-S55/L User Manual

FM/AM QUARTZ SYNTHESIZER TUNER
mov. AT=-$55/L
STEREO INTEGRATED AMPLIFIER
mopLAM=U55/J

Akai AT-S55/L Specifications

General

Model	AT-S55/L
Polyphony	8 voices
MIDI	MIDI In/Out/Thru
Type	Synthesizer
LFO	1 LFO
Memory	64

Summary

I. Specifications

FM Tuner Section Specifications

Technical specifications for the FM tuner.

AM Tuner Section Specifications

Technical specifications for the AM tuner.

LW Tuner Section Specifications

Technical specifications for the LW tuner.

Output, Power, and Dimensions

Output levels, power, dimensions, and weight specs.

II. Dismantling of Unit

Dismantling Procedure

Step-by-step instructions for disassembling the unit.

III. Controls

Front Panel Controls Overview

Identification and description of front panel controls.

IV. Principal Parts Location

Internal Component Layout Diagrams

Diagrams showing the placement of major internal components.

V. Voltage Conversion

Voltage Setting Adjustment Procedure

Instructions for changing the unit's voltage settings.

VI. Adjustments

AM Section Adjustments

Step-by-step procedures for AM tuner adjustments.

LW Section Adjustments

Procedures for adjusting the LW tuner section (AT-S55L only).

FM Section Adjustments

Procedures for adjusting the FM tuner section.

VII. Classification of Various P.C. Boards

P.C. Board Titles and Identification Numbers

Lists P.C. board titles and their corresponding part numbers.

AT-S55 P.C. Board Composition

Component layout for AT-S55 P.C. boards.

AT-S55L P.C. Board Composition

Component layout for AT-S55L P.C. boards.

I. Specifications (AM-U55/J)

Power Amplifier Section Specifications

Technical specs for the power amplifier section.

Pre-Amplifier Section Specifications

Technical specs for the pre-amplifier section.

Miscellaneous Specifications

Power requirements, dimensions, and weight.

II. Dismantling of Unit (AM-U55/J)

Dismantling Procedure (AM-U55/J)

Step-by-step instructions for disassembling the unit.

III. Controls (AM-U55/J)

Model AM-U55 Controls

Identification of controls on the AM-U55 model.

Model AM-U55J Controls

Identification of controls on the AM-U55J model.

IV. Principal Parts Location (AM-U55/J)

AM-U55 Component Layout

Diagrams showing component placement for AM-U55.

AM-U55J Component Layout

Diagrams showing component placement for AM-U55J.

V. Voltage Conversion (AM-U55/J)

Voltage Setting Adjustment Procedure

Instructions for changing the unit's voltage settings.

VI. Adjustments (AM-U55/J)

Pre Amp P.C. Board Adjustments

Adjustment points on the pre-amplifier circuit board.

Main Amp P.C. Board Adjustments

Adjustment points on the main amplifier circuit board.

Power Meter Sensitivity Adjustment

Procedure to adjust the power meter sensitivity.

Center Off-Set Voltage Adjustment

Procedure to adjust the speaker output DC offset voltage.

VII. Classification of Various P.C. Boards (AM-U55/J)

P.C. Board Titles and Identification Numbers

Lists P.C. board titles and their corresponding part numbers.

AM-U55 P.C. Board Composition

Component layout for AM-U55 P.C. boards.

AM-U55J P.C. Board Composition

Component layout for AM-U55J P.C. boards.

I. Model AT-S55/L Parts List

Recommended Spare Parts (AT-S55/L)

List of recommended spare parts for the AT-S55/L model.

Tuner P.C. Board Block (AT-S55)

List of tuner P.C. board components for AT-S55.

Synthesizer P.C. Board Block

List of synthesizer P.C. board components.

Power Supply P.C. Board Block

List of power supply P.C. board components.

Assembly Block

Lists components for assembly stages.

Final Assembly Block

Lists components for the final assembly stage.

II. Model AM-U55/J Parts List

Recommended Spare Parts (AM-U55/J)

List of recommended spare parts for the AM-U55/J model.

Main Amp P.C. Board Block

List of main amplifier P.C. board components.

Group (1) P.C. Board Block

List of components for P.C. board group 1.

Group (2) P.C. Board Block (JPN Model Only)

List of components for P.C. board group 2 (JPN models).

Assembly Block

Lists components for assembly stages.

Final Assembly Block

Lists components for the final assembly stage.

Schematic Diagrams of ICs

LA1231N IC Schematic

Block diagram and pinout for the LA1231N IC.

LA1245 IC Schematic

Block diagram and pinout for the LA1245 IC.

LA3380(B) IC Schematic

Block diagram and pinout for the LA3380(B) IC.

LB1260 IC Schematic

Transistor array diagram for LB1260.

LB1269 IC Schematic

Transistor array diagram for LB1269.

LB1405S IC Schematic

Block diagram and pinout for the LB1405S IC.

LB1409 IC Schematic

Block diagram and pinout for the LB1409 IC.

M5213L IC Schematic

Transistor schematic for M5213L.

M5214L IC Schematic

Transistor schematic for M5214L.

STK-2155 IC Schematic

Transistor schematic for STK-2155.

STK-3042 IC Schematic

Transistor schematic for STK-3042.

TA7317 IC Schematic

Block diagram for TA7317.

TA7324P IC Schematic

Block diagram for TA7324P.

TA75558S IC Schematic

Block diagram for TA75558S.

TC4069UBP IC Schematic

Logic gate diagram for TC4069UBP.

TC9125P IC Schematic

Block diagram for TC9125P.

TD6102P IC Schematic

Block diagram for TD6102P.

TD62506P IC Schematic

Transistor schematic for TD62506P.

AT-S55 Tuner & Power Schematic Diagram

AT-S55 Synthesizer Schematic Diagram

Schematic diagram for the AT-S55 synthesizer section.

AM-U55 Schematic Diagram

AM-U55J Schematic Diagram

Schematic diagram for the AM-U55J model.