6-46
DNW-A22/A22P
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.)
Connection and Setting of Spectrum Analyzer
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.
RV704
A
D902
B
C
D
E
F
G
S901
DM-89
RV503
E303
1
2
3
4
5
6
7
A
1-648-541-
MADE IN JAPAN
E901
RV703
TP8
TP7
TP6
TP5
TP4
TP3
TP2
TP1
RV504
E105
LOTNO,
S NO,
S501
E702
TP505
TP705
TP704
E701
TP703
TP702
TP701
TP305
TP700
TP306
TP208
RV301
RV302
RV303
RV304
RV401
RV701
RV702
RV402
RV406
RV407
TEST
S301
TP304
E302
TP303
TP302
E301
TP300
TP404
TP403
RV405
TP503
E501
TP504
TP502
RV502
RV501
RV506
RV507
TP500
TP506
TP501
TP106
TP105
RV102
RV104
RV101
RV103
RV305
RV306
RV307
RV308
RV105
RV106
RV107
RV108
RV201
RV202
E104
E102
TP102
TP103
S101
E103
E101
TP100
S102
RV211
RV212
RV205
TP202
TP204
E902
TP203
A No.
ON
OFF
S302
TEST
TEST
TEST
ON
OFF
NOR
NOR
NOR
NOR
DM-89 Board (Side A)
RV105 (F-4)
RV106 (F-5)
RV107 (F-5)
RV108 (F-5)
RV305 (F-4)
RV306 (F-5)
RV307 (F-5)
RV308 (F-5)
6-3. DM-89 Board Replacement
Oscilloscope
AGATE
OUT
CH-2
OUT
CF :
SPAN :
RBW :
VBW :
SWP TIME :
CH-1
IN
CH-2
IN
Spectrum analyzer
EXIT TRIG
10 MHz
20 MHz
100 kHz
10 kHz
100 ms
INPUT
DM-89
TP4
TP501