Jvc RX 8020 RBK Service Manual

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JVD
SERVICE MANUAL

AUDIONIDEO CONTROL RECEIVER

RX-8020VBK

Area suffix
UJ - U.S.Military

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D I G I TA L - EX
Contents
Safety precautions ________________________________________________________ 1.2
Disassembly method _____________________________________________________ 1.3
Adjustment method ....................................................... 1-9
Self-diagnose function ------------------- 1-10
Description of major le _________________________________________________ 1.12~31
No.21161
COPYRIGHT $3 2002 VICTOR COMPANY OF JAPAN, LTD.

Oct. 2002

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RX-8020VBK

Adjustment method

I Tuner section

1.Tuner range
FM 87.5MH2~108.0MH2
AM(MW) 531 kHz to 1 602 kHz (at 9 kHz intervals)
530 kHz to 1 600 kHz (at 10 kHz intervals)

I Power amplifier section
Adjustment of idling current
Measurement location B2204-B2205(Lch) , B2213-2214(Rch)
Adjustment part VR787(Lch) , VR788(Rch)

Attention

This adjustment does not obtain a correct adjustment value immediately after the amplifier is
used (state that an internal temperature has risen).

Please adjust, after you turn off amplifier and internal temperature falls.

1.Set the volume control to minimum during this adjustment.(No signal & No load)

2.Set the surround mode OFF.

2.Turn VR787 and VR788 fully counterclockwise to warm up before adjustment.
If the heat sink is already warm from previous use the correct adjustment can not be made.

3.For L-ch,connect a DC voltmeter between 82204 and 82205 (Lch)
And,connect it between B2213 and 32214(Rch).

4.30 minutes later after power on, adjust VR787 for L-ch, or VR788 tor R-ch so that the DC voltmeter
value has 1mV~10mV.

" It is not abnormal though the idling current might not become OmA even it it is finished to turn variable
resistance (VR787,VR788) in the direction of counterclockwise.

Rch amp. board

VR788 (Rch)

B2213, 32214

Lch amp. board

VR787 (Lch)
32204, B2205

1-9