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6-3. DM-89 Board Replacement
7. OMC Carrier Balance Provisional Adjustment
m
. This provisional adjustment explains how to adjust without using the spectrum analyzer.
When performed "6. OMC Carrier Balance Adjustment" using the spectrum analyzer, this provisional
adjustment is not required.
. Perform this provisional adjustment only the spectrum analyzer is not available for an urgent mainte-
nance. At a later date, be sure to perform "6. OMC Carrier Balance Adjustment" using the spectrum
analyzer.
Set the following RVs on DM-89 board to each specified position respecitively as show below.
8. Demodulator Limiter Balance Adjustment
Measuring equipment: Spectrum analyzer and Oscilloscope (Refer to next figure.)
DM-89
TP4
TP501
n
Perform the provisional adjustment only when the spectrum analyzer is not available for an urgent
maintenance. At a later date, be sure to perform the adjustment using the specturm analyzer.
6-46
RV105 (F-4)
RV106 (F-5)
RV107 (F-5)
RV108 (F-5)
RV305 (F-4)
RV306 (F-5)
RV307 (F-5)
RV308 (F-5)
Oscilloscope
CH-1
AGATE
IN
OUT
CH-2
CH-2
IN
OUT
Connection and Setting of Spectrum Analyzer
A
B
C
RV704
RV703
D902
ON
E303
TP8
TP7
S901
OFF
E901
TP704
TP702
TP701
RV702
TP305
RV701
TP700
RV401
RV301
RV302
RV303
RV304
RV402
S302
RV406
S301
TEST
NOR
RV407
E302
TEST
NOR
TP303
TP304
RV405
TP404
TP302
TP300
E301
DM-89 Board (Side A)
Spectrum analyzer
CF :
EXIT TRIG
SPAN :
RBW :
VBW :
INPUT
SWP TIME :
D
DM-89
E
F
G
OFF
ON
RV504
E105
TP6
TP5
S501
TP4
TP3
TP2
TP1
RV503
A No.
LOTNO,
E702
TP705
TP505
TP503
TP504
E701
TP502
TP703
E501
RV501
RV502
TP501
RV507
RV506
TP500
RV305
TP105
TP106
TP306
RV306
TP506
TP208
RV105
RV102
RV104
RV106
RV107
RV101
RV103
RV201
RV307
E102
RV308
S102
TP103
RV108
TEST
NOR
S101
RV211
TP102
TEST
NOR
TP403
E103
TP202
TP204
TP100
E101
E902
10 MHz
20 MHz
100 kHz
10 kHz
100 ms
DNW-A22/A22P
S NO,
1
2
3
4
RV202
5
E104
RV212
6
RV205
TP203
7
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