Technics SA-EH670 User manual

AD0105109C2

Tuner/Amplifier

SA-EH670

Colour

(S)...................Silver Type

Areas

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

(EG).................Germany, Italy, France, Netherlands and Denmark.

(EP).................East Europe.

SPECIFICATIONS

Unauthorized copying and distribution isaviolation of law.

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 V.

Powersupply

voltage AC 230 V

Consumedcurrent

50 Hz 70 ~ 300

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:

When the protection circuitryfunctions, the unitwill not operate

unless the power isfirst switched OFF and then ONagain.

3. Accessories

-AC power supplycord / (RJA0019-1X)................................1pc.

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

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

-Speaker cords / (REE1057)....................................2pcs.

-Remote control transmitter / (EUR7702170)..............................1pc.

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

Note: These are availableon sales route.

4. Location of Controls

5. 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

described onlywhen required.

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

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

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

-Follow the (Step 1) -(Step 3) of item 5.1.

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

5.3. Checking for the mainP.C.B.

-Follow the (Step 1) -(Step 3) of item 5.1.

-Follow the (Step 1) -(Step 6) of item 5.2.

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

5.4. Replacement for the regulator transistor

-Follow the (Step 1) -(Step 3) of item 5.1.

5.5. Replacement for the power IC

-Follow the (Step 1) -(Step 3) of item 5.1.

-Follow the (Step 1) -(Step 6) of item 5.2.

-Follow the (Step 1) -(Step 10) of item 5.3.

6. To Supply Power Source

This unit SA-EH670 is designedtooperate on powersuppliedfromsystemconnected. / For

systemconnection, referto Fig. 6-1.

Fig. 6-1.

Whenthe unit SA-EH670 has totest and service alone, use the following method tosupply

powersource.

1. Short the section between W902APin3and C740 (-) (GND). (Refer

to Fig. 6-2. )

2. Connect thisunitto an AC power supplycord. / (Thisunitcome to

stand-bymode.)

3. Turn the unitON.

Fig. 6-2.

Notes:

Use onlythismethod when checking the voltage.. / Incase of

checking the operations, use the system connections to supply

power source.

7. Self-Diagnostic Function

This unit is equippedwitha self-diagnostic function which, inthe event of a malfunction,

automaticallydisplays a code indicating the nature of the malfunction.

Use this self-diagnostic function whenservicing the unit.

7.1. To displaythe malfunction code

U70 CD:/ U70 DECK:

Automaticallydisplayson the tuner/amplifier when amalfunction

occurs. Refer to Fig. 7-1.

F61:

Automaticallydisplayson the tuner/amplifier when amalfunction

occurs. Refer to Fig. 7-1. Fig. 7-1.

7.2. To return to the normal display

1. For U70 CD/U70 DECK

-Press an anyoperation button on the tuner/amplifier.

-To re-displaythe code, switch the power off (POWER

STANDBYbutton), and then switch power back on again.

2. For F61

-IfF61 isdisplayed, the power will automaticallybe switched

off and the standbyindicator will light up.

-F61 will be displayed for 3seconds, and then the clock will be

displayed.

-To re-displaythe code, switch the power on. F61 will be re-

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