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SECTION
3
MX-P 21
MX-P 21
ADJUSTMENTS
+5 V VOLTAGE
ADJUSTMENT
When components in the DC-DC converter are re-
placed, perform the following adjustment.
Set Up:
DC-DC converter is properly connected to the rest,
ie., properly loaded.
Use adequate line (mains)
voltage.
Procedure:
Adjust R18
so that the test-point (output line of
+5 V) voltage becomes in +5.00 V.
Adjustment Location:
— DC-DC converter board —
test point
LEVEL
METER
ADJUSTMENT
Set Up:
PAN control:
_C (center click)
EQ switch:
OFF
LCF switch:
OFF
MIC
LEVEL control:
—60
LINE/MIC/PHONO switch: MIC
Procedure:
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attenuator
O
MIC INPUT 1
1 kHz, —60 dB (0.77 mV)
LINE OUT (balanced):
+3.6 dB m (1.16 V)
AUX OUT: —5.4 aB (0.42 V)
. Adjust
MASTER
control so that balanced
LINE
OUT level becomes in 3.6 dBm (1.16 V).
. Adjust RV302 (L-CH) and RV304 (R-CH) so that
MASTER level meter reads ''0"' indication.
LINE OUT
MAXIMUM
GAIN
ADJUSTMENT
Procedure:
AUX
1 MAXIMUM
GAIN
ADJUSTMENT
Set Up:
Set Up:
PAN control:
C (center click)
EQ switch:
OFF
LCF switch:
OFF
MIC
LEVEL control:
—60
LINE/MIC/PHONO switch:
MIC
PRE/(post) switch:
post (not depressed)
PAN control:
C (center click)
EQ switch:
OFF
LCF switch:
OFF
MIC
LEVEL control:
—60
LINE/MIC/PHONO switch: MIC
Procedure:
af osc
af osc
ae,
attenuator
O
VTVM
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attenuator
6002
6002
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O
Oo——O
Oo
©
scood
= Rt
MIC INPUT 1
LINE OUT (balanced)
MIC INPUT 1
AUX 1 (OUTPUT)
1kHz,—-70dB(0.25mV)
+14dB8 (3.9 V)
1 kHz, —70dB (0.25 mV)
+15 dB (4.4 V)
Adjust RV301
(L-CH) and RV303 (R-CH) so that
the gain from
MIC
INPUT
1 to balanced
LINE
OUT becomes in 84 dB.
Adjust RV305
so that the gain from MIC INPUT
1 to AUX
1 output becomes in 85 dB.
. Adjust AUX OUT
1 and AUX OUT 2 controls so
that AUX
OUT
1 and AUX OUT 2 output levels
become in —5.4 dB (0.42 V).
. Adjust RV306
(AUX
1) and RV308 (AUX 2) so
that AUX level meters indicate ''0"'.
Adjustment Location:
— PGA board —
Adjustment Location
— PGA board —
Adjustment Location:
— PGA board —
ay
Bik:
RV304
RV306
RV308
(R-CH)
(AUX 1)
(AUX 2)
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