Technics SA-EH780E User manual

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AD0202025C2

Tuner/Amplifier

SA-EH780E / SA-EH780EB / SA-EH780EE / SA-EH780EG / SA

-EH780EP

Colour

(N)...................GoldType

SPECIFICATIONS

2002 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.

Unauthorized copying and distribution isaviolation of law.

1

1. Before Repairs

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

both ends of power supplycapacitors (C701, C703 and C702,

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 100 - 350 mA

2. 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.

Note:

Whenthe protection circuitryfunctions, the unit will not operate unless the poweris first

switchedOFF and thenON again.

3. Accessories

2

-AC power supplycord for SA-EH780E, SA-EH780EE, / SA-

EH780EG, SA-EH780EP / (RJA0019-2X)................................1pc.

-AC power supplycord for SA-EH780EB/ (RJA0053-

3X)................................1pc.

-AMloop antenna set / (RSA0022-L)..................................1pc.

-FM indoor antenna / (RSA0007)......................................1pc.

-Speaker cords / (REE0853)....................................2pcs. /

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

-Remote control transmitter / (EUR7702050)..............................1pc.

3

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

Note: These are availableon sales route.

-Antenna plug adaptor for SA-EH780EBonly/

(SJP9009)......................................1pc.

4. Caution for AC Mains Lead

4

5. Location of Controls

6. 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.

6.1. Checking for the AC INP.C.B.

-Check the AC INP.C.B. as shownbelow.

6.2. Checking for the operation P.C.B.

-Follow the (Step 1) -(Step 3) of item 6.1.

6

-Check the operation P.C.B. as shownbelow.

6.3. Checking for the mainP.C.B.

-Follow the (Step 1) -(Step 3) of item 6.1.

-Follow the (Step 1) -(Step 6) of item 6.2.

7

8

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

6.4. Replacement for the regulator transistor

-Follow the (Step 1) -(Step 3) of item 6.1.

9

6.5. Replacement for the power IC

-Follow the (Step 1) -(Step 3) of item 6.1.

-Follow the (Step 1) -(Step 6) of item 6.2.

-Follow the (Step 1) -(Step 11) of item 6.3.

7. To Supply Power Source

This unit is designedtooperate on powersuppliedfromsystemconnected. / Forsystem

connection, referto Fig. 7-1.

Fig. 7-1.

10