Technics SU-V300M2 Manual de usuario

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AD0104089C2

Stereo Integrated Amplifier

SU-V300M2

Colour

(K)...........Black Type

Areas

(E)...........Europe.

(EB).........Great Britain.

(EG).........Germany.

SPECIFICATIONS

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1. Note

-The contents changed from Model No. SU-V300M2 (Order No.

AD99003072C2)

Thismodel [SU-V300M2 (Order No. AD0104089C2)] ischanged

from Model No. SU-V300M2 (Order No. AD9903072C2) about

Printed CircuitBoard. So you need to use the service manual

2

properlywith distinguishing the unitissoldon and after April

2001 ornot.

When the unitisrepaired, refer to the tableas shownbelow and

confirm IC601 and Part No. of operation P.C.B.

SU-V300M2 /

(AD903072C2) SU-V300M2 /

(AD0104089C2)

IC601 RSN3502A RSN3502C

Operation

P.C.B. RJB1273BB-2 RJB1273BB-3

The time of

sales Before April 2001 Onand after

April 2001

2. Before Repairs

1. Turn off the power supply. Using a10 , 10 Wresistor, connect

both ends of power supplycapacitors (C703, C704) inorder to

discharge the voltage.

2. Before turning the power supplyon, after completion of repair,

slowlyapplythe primaryvoltage byusing apower supplyvoltage

controller to make sure that the consumed current at 50 HzinNO

SIGNALmode shouldbe shownbelow with respectto supply

voltage 230/240 V.

Powersupply

voltage AC 230 V AC 240 V

Consumedcurrent

50 Hz 47 ~ 157

mA 45 ~ 150

mA

3. Protection Circuitry

The protection circuitrymayhave operatedif eitherof the following conditions is noticed:

-Nosound isheard when the power isswitched ON.

-Sound stops during aperformance.

The functions of this circuitryis toprevent circuitrydamage if, forexample, the positive and

negative speakerconnection wires are shorted, orif speakersystems withanimpedance less

thanthe indicatedratedimpedance of this unit are used.

If this occurs, followthe procedures outlinedbelow.

1. Switch OFF the power.

2. Determine the cause of the problem and correct it.

3. Switch ONthe power once again.

3

Note:

When the protection circuitryfunctions, the unitwill not operate

unless the power isfirst switched OFF and then ONagain.

4. Accessories

-AC power supplycord for (E) and (EG)areas

(RJA0019-1X)................................1pc.

-AC power supplycord for (EB)area

(RJA0035-2X)................................1pc.

5. Caution for AC Mains Lead

4

6. Location of Controls

7. Operation Checks and Component Replacement /

Procedures

-Thissection describes procedures for checking the operation of

the major printed circuitboards and replacing the main

components.

-For reassemblyafter operation checks or replacement, reverse the

respective procedures. Special reassemblyprocedures are

5

described onlywhen required.

7.1. Checking for the operation P.C.B. and tone amp P.C.B.

-Check the operation P.C.B. and tone amp P.C.B. as shownabove.

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7.2. Checking for the mainP.C.B.

-Follow the (Step 1) -(Step 5) of item 7.1.

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-Check the mainP.C.B. as shownbelow.

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7.3. Replacement for the power IC

-Follow the (Step 1) -(Step 3) of item 7.1.

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8. Type Illustration of ICs, Transistors and Diodes

9. Schematic Diagram Notes

-Thisschematicdiagram maybe modified at anytime with the

development of new technology.

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