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STR-GX57ES /GX67ES
|
AM
SECTION
Procedure :
- AM Signal Adjustment
1. Feed-in 1kHz 300mV (-10.5dB)
Setting :
Signal to + side of capacitor C386 and C387.
2. Adjust RV301 so that the reading on the
voltmeter becomes 550mV (-5.2dB) at minus (-)
Reveal REE
side of capacitor C319 with the adjustment.
antenna
set
AMP SECTION
DC Bias Adjustment
loop antenna
AM rf
signal generator
Carrier frequency : 1,050kHz
- Perform
this
adjustment
after
replacement
of
Modulation : 400Hz, 30% modulation
power amp or drive circuit transistors.
Procedure
:
.
setting :
1. Set loop antenna
so that the LAYOUT-FREE
antenna input level becomes 0.2V (106dB)
2. Tune the set to 1,050kHz.
3. Adjust the RV23 so that the 8 point segment of
the signal meter goes on.
VOLUME
: 0
SPEAKERS. : OFF (no load)
Procedures :
1. Connect the digital voltmeter to Bias Test Point
(TP701 @,
@: LCH, @,
©: RCH)
+ SORROUND output level Adjustment
confirming that the voltmeter will not indicate an
Setting :
abnormal value.
FUNCTION
: CD
3. Confirm that the display is normal.
aa
D
2 SIMULATED
4, Adjust RV701 (L-ch) or RV751 (R-ch) so that the
reading on the voltmeter becomes 2.5mV within
30 seconds after the power turned on.
Input :
AF OSC
Note:
It is normal that the voltage will increase as
VTVM
time passes.
=)
attenuator
Ey]
5. Turn the power off and remove the digital volt-
ae
fore)
'
O
meter.
oO
O
oe
1kHz
oe
C386(Lch)
+ Side,
C387(Rch)
+ Side,
300mV
(- 10.5dB)
Output :
C319 — Side
550mV (-5.2dB)
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