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6-3. DM-89 Board Replacement
11. Drop-out Compensation Equalizer Adjustment
Measuring equipment: Oscilloscope
(1) Connect and set the oscilloscope as follows:
CH-1:
TP203/DM-89(G-7), DC >200 mV/DIV, 2 ms/DIV, GND: E104/DM-89(G-5)
CH-2:
TP4/DM-89(E-1), DC 1 V/DIV, GND: E702/DM-89(D-1)
Trigger: CH-2, _ slope
(2) METAL Y adjustment
Playback the RF sweep signal portion (0:00 to 2:00) of the alignment tape CR5-1B or CR5-1B PS,
and perform the adjustment. (DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
Adjustment point: 1RV201/DM-89(G-5)
Specifications:
See the table below.
Observation freq.
Specification for DNW-A22
6 MHz
Reference: 100% {0 dB}
100 ± 20 % {0 ±2.0 dB}
8 MHz
+50
10 MHz
120
_20
100%
1
DNW-A22
6-56
+5.0
% {2.0
dB}
_2.0
6
8
10
[MHz]
Observation freq.
Specification for DNW-A22P
6 MHz
Reference: 100% {0 dB}
100 ± 20 % {0 ± 2.0 dB}
8 MHz
+40
10 MHz
110
% {1.0
_20
100%
1
4
6
DNW-A22P
A
B
C
RV704
RV703
D902
ON
TP8
TP7
TP6
E303
S901
OFF
TP5
E901
TP704
TP703
TP702
TP701
RV702
TP305
RV401
TP700
TP306
RV701
TP208
RV301
RV302
RV303
RV304
RV402
S302
RV406
S301
TEST
NOR
E302
RV407
TEST
NOR
TP303
TP304
RV405
TP403
TP404
TP302
TP300
E301
DM-89 Board (Side A)
+4.0
dB}
_2.0
8
10
[MHz]
D
DM-89
E
F
G
OFF
ON
RV504
E105
S501
TP3
TP2
TP1
RV503
A No.
LOTNO,
S NO,
TP4
E702
TP705
TP505
TP504
TP503
E701
TP502
E501
RV501
RV502
TP501
RV507
RV506
TP500
TP105
TP106
TP506
RV305
RV105
RV201
RV102
RV104
RV306
RV106
RV202
RV107
RV307
RV101
RV103
RV308
E104
RV108
E102
TP104
S102
TP103
TEST
NOR
S101
RV211
RV212
TP102
TEST
NOR
E103
TP202
RV205
TP204
TP100
TP203
E101
E902
DNW-A22/A22P
1
2
3
4
5
6
7
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