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6. OMC Carrier Balance Adjustment
Measuring equipments: Spectrum analyzer and Oscilloscope (Refer to next figure.)
DM-89
TP
TP
(1) Connect and set the oscilloscope as follows:
CH-1:
TP4/DM-89(E-1), DC 1 V/DIV, 5 ms/DIV, GND: E702/DM-89(D-1)
CH-2:
TP105/DM-89(G-4), AC 1 V/DIV, GND: E105/DM-89(G-1)
Trigger: CH-1, _ slope
(2) OXIDE Y adjustment
Playback the pulse and bar signal portion (9:00 to 11:00) of the alignment tape CR5-2A or CR5-2A
PS, and perform the adjustment. (DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
Adjustment point: 1RV107/DM-89(F-5) and 1RV108/DM-89(F-5)
A > 35 dB
Specification:
fc
5.5 MHz
11.0 MHz
DNW-A22
(3) Stop the playback of the alignment tape CR5-2A/CR5-2A PS.
DNW-A22/A22P
Oscilloscope
CH-1
AGATE
IN
OUT
CH-2
CH-2
IN
OUT
Connection and Setting of Spectrum Analyzer
A
2fc
Spectrum analyzer
CF :
EXIT TRIG
SPAN :
RBW :
VBW :
INPUT
SWP TIME :
fc
6.25 MHz
DNW-A22P
A
B
C
RV704
RV703
D902
ON
E303
TP8
TP7
S901
OFF
E901
TP704
TP702
TP701
RV702
TP305
TP700
TP306
RV701
RV401
TP208
RV301
RV302
RV303
RV304
RV402
S302
RV406
S301
TEST
NOR
RV407
E302
TEST
NOR
TP303
TP304
RV405
TP403
TP404
TP302
TP300
DM-89 Board (Side A)
6-3. DM-89 Board Replacement
10 MHz
20 MHz
100 kHz
10 kHz
100 ms
A
2fc
12.5 MHz
D
DM-89
E
F
G
OFF
ON
RV504
TP6
TP5
S501
TP3
TP2
TP1
RV503
A No.
LOTNO,
TP4
E702
TP705
TP505
TP503
TP504
E701
TP502
TP703
E501
RV501
RV502
TP501
RV507
RV506
TP500
TP105
TP106
TP506
RV305
RV105
RV102
RV104
RV306
RV106
RV107
RV307
RV101
RV103
RV202
RV201
RV308
RV108
E104
E102
TP104
S102
TP103
TEST
NOR
S101
RV211
TP102
TEST
NOR
E103
TP202
TP204
TP100
E105
S NO,
1
2
3
4
5
RV212
6
RV205
6-43
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