Technics SA-EH770 User manual

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AD0104055C3

Tuner/Amplifier

SA-EH770

Colour

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

Areas

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

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

SPECIFICATIONS

1

1

1. BeforeRepairs

1. Turn off thepowersupply. Using a10 , 10 Wresistor, connect bothendsof

powersupplycapacitors(C701, C703 and C702, C704) inordertodischargethe

voltage.

2

2. Beforeturning thepowersupplyon, aftercompletion ofrepair, slowlyapplythe

primaryvoltagebyusing apowersupplyvoltagecontrollertomake surethat the

consumedcurrentat 50 HzinNOSIGNALmodeshouldbeshownbelowwith

respecttosupplyvoltage110/240 V.

Powersupply

voltage AC110 V AC240 V

Consumedcurrent

50 Hz 200 ~700

mA 100 ~350

mA

2. Protection Circuitry

Theprotection circuitrymay have operatedifeitherofthefollowing conditionsis

noticed:

- Nosound isheard whenthepowerisswitchedON.

- Sound stopsduring aperformance.

Thefunctionsofthiscircuitryistopreventcircuitrydamageif, for example, the

positive and negative speakerconnection wires areshorted, or ifspeakersystems

withanimpedance less thantheindicatedratedimpedance ofthisunitareused.

Ifthisoccurs, followtheprocedures outlinedbelow.

1. SwitchOFF thepower.

2. Determinethecause oftheproblemand correct it.

3. SwitchONthepoweronce again.

Note:

Whentheprotection circuitryfunctions, theunitwill notoperate unless thepower

isfirst switchedOFF and thenONagain.

3. Accessories

- AC powersupplycord for (GC) area

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

3

- AC powersupplycord for (GN) area

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

- AMloop antennaset

(RSA0022-L)..................................1pc.

- FMindoor antenna

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

4

- Speakercords

(REE0853).....................................2pcs.

(REE1057).....................................2pcs.

- Remote control transmitter

(EUR7702060)..............................1pc.

- Remote control batteries

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

Note:These areavailableon sales route.

5

- Powerplug adaptor for (GC) area only

(SJP5213-2)..................................1pc.

4. Location of Controls

5. Operation Checks and Component Replacement

Procedures

Note:

Thecontents ofthissection describes for Europe. Soplease use thissection as a

reference.

- Thissection describes procedures for checking theoperation ofthemajor

printedcircuitboardsand replacing themaincomponents.

6

- For reassemblyafteroperation checks or replacement, reverse therespective

procedures. Special reassemblyprocedures aredescribedonlywhenrequired.

5.1. Checking fortheACINP.C.B.

- Check theAC INP.C.B. as shownbelow.

7

5.2. Checking fortheoperation P.C.B.

- Followthe(Step1) -(Step3) ofitem5.1.

8

9

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

10