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RX-504VBK/RX-504VLBK
RX-505VTN/RX-SO5VLTN
Power Amplifier Adjustment Procedures
i idling Current
(1)
Set the volume control to minimum during this adjustment.
(2)
Turn R751 and R752 fully counterclockwise before the power switch on.
(3)
Always start from cold,and allow 5 minutes to warm up before adjustment.If the heatsink is already warm from
previous use the correct adjustment can not be made.
:
(5)
Connect a DC voltmeter to R787 resistor's leads for left channel, or to R788 for right channel.
(6)
Adjust R751 for left channel, or 752 for right channel, so that the DC voltmeter becomes 2mV ~ 7mV
Timing Chart
IC421
AC Plugin
Power on
Power off
AC Plug out
!
1
I
RESET (pin19)
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ee
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t
HOLD (pin 39) pee
!
/
\
/
\
MUTE (pin 37)
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1
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A
Wile pressing the
When prssing the
T
j
UNING key.
FM or AM key.
When pressing the
TUNING key.
1C401
RESET (pin 43)
\ /
INH (pin 45)
/
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1
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1
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1
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1
!
t
T.MUTE (pin56)
|
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While listening a source
except tuner.
1-36 (No.20220)
;
;
;
3
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