Technics SC-EH760 User manual

AD0004083C3

Tuner/Amplifier

SA-EH760

Colour

(S)....................SilverType

Areas

(GC)..................Asia, LatinAmerica, MiddleNearEast and Africa.

(GN)..................Oceania.

SPECIFICATIONS

1. BeforeRepairs

1. Turnoff thepowersupply. Using a10 , 10 Wresistor, connect

bothendsofpowersupplycapacitors(C701, C703 and C702,

C704) inordertodischargethevoltage.

2. Beforeturning thepowersupplyon, aftercompletion ofrepair,

slowlyapplytheprimaryvoltagebyusing apowersupplyvoltage

controllertomake surethat theconsumedcurrentat 50 HzinNO

SIGNALmodeshouldbeshownbelow.

For (GC) area

Powersupply

voltage AC110 V, 50 Hz AC240 V, 50 Hz

Consumed

current 200-700 mA 100-350 mA

For (GN) area

Powersupply

voltage AC240 V, 50 Hz

Consumed

current 100-350 mA

2. Protection Circuitry

Theprotection circuitrymay have operatedifeitherofthefollowing conditionsisnoticed:

-Nosound isheardwhenthepowerisswitchedON.

-Sound stopsduring aperformance.

Thefunctionsofthiscircuitryistopreventcircuitrydamageif, for example, thepositive and

negative speakerconnection wires areshorted, or ifspeakersystemswithanimpedance less

thantheindicatedratedimpedance ofthisunitareused.

Ifthisoccurs, followtheprocedures outlinedbelow.

1. SwitchOFF thepower.

2. Determinethecause oftheproblemand correct it.

3. SwitchONthepoweronce again.

Note:

Whentheprotection circuitryfunctions, theunitwill notoperate

unless thepowerisfirst switchedOFF and thenONagain.

3. Accessories

-ACpowersupplycordfor(GC)area / (RJA0019-X)...........................1

pc.

-ACpowersupplycordfor(GN)area / (RJA0035-X)...........................1

pc.

-AMloop antennaset / (RSA0022-J)...........................1pc.

-FMindoorantenna/ (RSA0006-J)............................1pc.

-Speakercords/ (REE0393)..............................2pcs. /

(REE0984)..............................2pcs. / (REE0985)..............................2

pcs.

-Remote control transmitter/ (RAK-EHA28WH)..................1pc.

-Remote control batteries / (R6/LR6, “AA”, UM-3)...........2pcs.

Note:These areavailableon sales route.

-Powerplug adaptorfor(GC)area only/ (SJP5213-

2)...........................1pc.

4. Location of Controls

5. Operation Checks and Component Replacement

Procedures

-Thissection describes procedures forchecking theoperation of

themajorprintedcircuitboardsand replacing themain

components.

-Forreassemblyafteroperation checks orreplacement, reverse the

respectiveprocedures. Special reassemblyprocedures are

describedonlywhenrequired.

5.1. Checking fortheACINP.C.B.

-Check theACINP.C.B. as shownbelow.

5.2. Checking fortheoperation P.C.B.

-Follow the(Step1) -(Step3) ofitem5.1.

-Check theoperation P.C.B. as shownbelow.

5.3. Checking forthemainP.C.B.

-Follow the(Step1) -(Step3) ofitem5.1.

-Follow the(Step1) -(Step7) ofitem5.2.

-Check themainP.C.B. as shownbelow.

5.4. Replacementfortheregulatortransistor

-Follow the(Step1) -(Step3) ofitem5.1.

5.5. ReplacementforthepowerIC

-Follow the(Step1) -(Step3) ofitem5.1.

-Follow the(Step1) -(Step7) ofitem5.2.

-Follow the(Step1) -(Step12) ofitem5.3.

6. ToSupplyPowerSource

ThisunitSA-EH760 isdesignedtooperateon powersuppliedform system connected. / For

system connections, referto Fig. 6-1.

Fig. 6-1.

WhentheunitSA-EH760 has totestand service alone, use thefollowing method tosupplypower

source.

1. Shortthesection betweenW902APin3and C740 (-) (GND). Refer

to Fig. 6-2.

2. Connect thisunittoanACpowersupplycord. / (Thisunitcometo

stand-bymode.)

3. TurntheunitON.

Fig. 6-2.

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