Technics SE-A909S Service Manual

Table Of Contents
COVER
1 Note
2 Location of Controls
3 To Supply Power Source
3.1 Power Supply to Main
Circuit
3.2 Operation Check
4 Operation Checks and
Component
ReplacementProcedures
5 Type Illustration of ICs,
Transistors and Diodes
6 Schematic Diagram
6.1 Schematic Diagram
Notes
6.2 Schematic Diagram
7 Printed Circuit Board
Diagram
8 Block Diagram
9 Wiring Connection
Diagram
10 Measurements and
Adjustments
10.1 Measurement
instruments and Special tools
10.2 Output Voltage
Adjustment
11 Terminal Function of
ICs
11.1 IC701
(M38503M2404F) : Micro
Computer
12 Replacement Parts List
13 Cabinet Parts Location
14 Packaging
Service Manual
TOP NEXT
AD9907176C2
Control Amplifier
● SU-C909U
Colour
(K)..........Black Type
Area
(E)..........Europe and Russia.
PV
PV

Technics SE-A909S Specifications

General

Input Impedance	47 kΩ
Damping factor	70 (8 Ohms)
Input sensitivity	1V
Speaker load impedance	4 - 16 Ω
Dimensions	430 x 150 x 390 mm
Frequency Response	5Hz-100kHz (+0, -3dB)
Signal-to-Noise Ratio	110dB

Summary

Specifications (DIN 45 500)

2 Location of Controls

Unit on/off button and remote standby indicator

Controls power and standby mode.

Input selector (SELECTOR)

Volume control (VOLUME)

3 To Supply Power Source

3.1 Power Supply to Main Circuit

Details how to supply power to the main circuit.

3.2 Operation Check

Outlines the procedure for checking the unit's operation.

4 Operation Checks and Component Replacement/Procedures

Checking for the operation of PCBs

Describes how to check the main and operation PCBs.

To remove each P.C.B.

6 Schematic Diagram

Schematic Diagram Notes

Explains symbols, notes, safety precautions, and modification notices for schematic diagrams.

Schematic Diagram

Displays the detailed circuit diagram for the unit.

7 Printed Circuit Board Diagram

8 Block Diagram

9 Wiring Connection Diagram

10 Measurements and Adjustments

Measurement instruments and Special tools

Lists required measurement tools and special equipment.

Output Voltage Adjustment

Details the procedure for adjusting output voltage.

11 Terminal Function of ICs

IC701 (M38503M2404F) : Micro Computer

Details the pin functions of the M38503M2404F microcomputer IC.

12 Replacement Parts List