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Y adjustment (using the spectrum analyzer)
(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:
TP501/DM-89(F-4), AC 1 V/DIV, GND: E501/DM-89(E-3)
Trigger: CH-1, _ slope
(2) Playback the flat filed signal portion (24:00 to 26:00) 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: 1RV502/DM-89(E-3)
Specification:
Maximize the level difference A. (Minimize the fc.)
A
7.6 MHz
DNW-A22
(3) Stop the playback of the alignment tape CR5-1B/CR5-1B PS.
Y provisional adjustment (without using the spectrum analyzer)
n
This provisional adjustment explains how to adjust without using the spectrum analyzer.
When performed the above adjustment using the spectrum analyzer, this provisional adjustment is not
required.
Set RV502/DM-89 (E-3) as show below.
DNW-A22/A22P
2fc
fc
15.3 MHz
A
fc
8.9 MHz
DNW-A22P
A
B
C
D
RV704
RV703
OFF
D902
ON
E303
TP8
TP7
TP6
TP5
S501
S901
OFF
E702
E901
TP705
TP704
E701
TP703
TP702
RV501
TP701
RV507
RV702
TP305
TP700
TP306
RV701
TP208
RV401
RV301
RV302
RV303
RV304
RV402
S302
RV406
S301
TEST
NOR
RV407
E302
TEST
NOR
TP303
TP304
RV405
TP403
TP404
TP302
TP300
E301
DM-89 Board (Side A)
6-3. DM-89 Board Replacement
2fc
17.7 MHz
DM-89
E
F
G
ON
RV504
E105
TP3
TP2
TP1
RV503
A No.
LOTNO,
S NO,
1
TP4
2
TP505
TP503
TP504
E501
3
TP502
RV502
TP501
RV506
TP500
TP105
TP106
4
TP506
RV305
RV105
RV102
RV104
RV306
RV106
RV107
RV307
RV101
RV103
RV202
5
RV201
RV308
RV108
E104
E102
TP104
S102
TP103
NOR
TEST
S101
RV211
RV212
TP102
6
TEST
NOR
E103
TP202
RV205
TP204
TP100
TP203
E101
7
E902
6-47
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