Pioneer A-509R Servis Kılavuzu - Sayfa 24

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A-509R

6. ADJUSTMENTS

6.1 IDLE CURRENT ADJUSTMENT

¶ CAUTION : Heatsinks' (Q323–Q326) DC level is equal to +B or -B.

Don't touch them or you will be electricary chocked.

1. Connect the measuring instrument as Fig.6-1. (R415 or R416)

2. Set the VOLUME CONTROL to minimum, BASS TONE CONTROL to center, TREBLE TONE CONTROL to center and BALANCE CONTROL

to center. Set VR301 and VR302 to minimum.

3. Set the POWER switch to ON.

4. Adjust VR301 (VR302) so that the voltage between both sides of R415 (R416) becomes 16mV±1mV. (Within 10 seconds from when the relay

is turned ON)

5. Ages for 7 minutes.

6. Adjust VR301 (VR302) so that the voltage between both sides of R415 (R416) becomes 11mV±1mV.

DC Voltmeter

R415

R413

W150

W212

Heat Sink

VR301

R417

Heat Sink

Fig.6-1 Adjustment Method

AF ASSY

SIDE A

Heat Sink

R416

R414

VR302

Heat Sink

CN204