Technics SU-V300M2 User manual

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
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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.
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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
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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
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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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