Technics SUC-909-S 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
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AD9907176C2
Control Amplifier
● SU-C909U
Colour
(K)..........Black Type
Area
(E)..........Europe and Russia.
PV
PV
© 1999 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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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
PV
PV
13 Cabinet Parts Location
14 Packaging
Service Manual
TOP NEXT
AD9907176C2
Control Amplifier
● SU-C909U
Colour
(K)..........Black Type
Area
(E)..........Europe and Russia.
© 1999 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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1 Note
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Refer to the servise manual for Model No. SE-A909S (ORDER No. AD9907177C2) for information
on Accessories, Connections, Operations and Packaging.
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2 Location of Controls
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3 To Supply Power Source
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This unit SU-C909U is designed to operate on power supplied from the Power Amplifier SE-A909S.
When operating the unit SU-C909U alone for testing and servicing, without having power supplied
from the Power Amplifier SE-A909S, use the following method.
3.1 Power Supply to Main Circuit
3.2 Operation Check
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3.1 Power Supply to Main Circuit
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1. Apply 10 V AC power to the section between the point TP1 and the point TP2 . Shown in
Fig.1
2. Connect the DC+12 V to+15 V (more than 0.1 A) to the point TP5 , and the GND terminal to
the point TP4 using the DC power supply. Shown in Fig.1
3. Connect the DC -12 V to -15 V (more than 0.1 A) to the point TP3 , and the GND terminal to
the point TP4 using the DC power supply. Shown in Fig.1
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3.2 Operation Check
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1. Input a signal (1 kHz, 100 mV) to the each line-in terminal.
2. Connect the oscilloscope or the speaker with the built-in amplifier to the PRE OUT terminals and
check if the signals are outputting from this unit.
Fig.1
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4 Operation Checks and Component
Replacement/Procedures
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5 Type Illustration of ICs, Transistors and
Diodes
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6 Schematic Diagram
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6.1 Schematic Diagram Notes
6.2 Schematic Diagram
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6.1 Schematic Diagram Notes
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● This schematic diagram may be modified at any time with the development of new
technology.
Notes:
❍ S801:
VGCA switch (
)
❍ S802:
Tape monitor switch (TAPE MONITOR)
❍ S804:
Input select switch (SELECTOR)
❍ S805:
Unit on/off switch (
/I)
❍ VR301:
Volume control VR (VOLUME)
❍ VR311:
Output voltage adjustment VR (L ch)
❍ VR312:
Output voltage adjustment VR (R ch)
❍ VR401:
Balance control VR (BALANCE)
❍ VR402:
Tone control VR (BASS)
❍ VR403:
Tone control VR (TREBLE)
● Indicated voltage values are the standard values for the unit measured by the DC electronic
circuit tester (high-impedance) with the chassis taken as standard. Therefore, there may exist
some errors in the voltage values, depending on theinternal impedance of the DC circuit tester.
No mark : Power ON
● Important safety notice:
Components identified by
mark have special characteristics important for safety.
Furthermore, special parts which have purposes of fire-retardant (resistors), high-quality
sound (capacitors), low-noise (resistors), etc. are used.
When replacing any of components, be sure to use only manufacturers specified parts shown
in the parts list.
● Caution!
IC and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during repair.
Cover the parts boxes made of plastics with aluminum foil.
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