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6-3. DM-89 Board Replacement
(25) Enter A34 : DM VR 3 of the maintenance mode.
(26) METAL C, Sub adjustment
For DNW-A22
Conform that the data value of A34 : DM VR 3 : SUB METAL-C-A and SUB METAL-C-B are 70.
If not, set them to 70.
For DNW-A22P
(i) Connect the oscilloscope's CH-2 to TP6/DM-89(D-1). GND : E702/DM-89(D-1)
(ii) Adjust the level difference at 8 MHz use 2 MHz as the reference.
Adjustment point: A34 : DM VR 3 : SUB METAL-C-A
Specification:
(iii) Set the data value of A34 : DM VR 3 : SUB METAL-C-B to the identical data value as SUB
METAL-C-A.
(27) Eject the alignment tape CR5-1B/CR5-1B PS.
(28) To exit A34 : DM VR 3, press the MENU button once.
OXIDE C adjustment [to step (41)]
(29) Insert the alignment tape CR5-2A or CR5-2A PS. (STANDBY OFF mode)
(DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
(30) Connect the output of network analyzer to TP303/DM-89(B-5). GND: E301/DM-89(B-7)
(31) Connect the oscilloscope's CH-2 to TP304/DM-89(B-5). GND: E302/DM-89(B-5)
(32) OXIDE C, Group delay adjustment
Adjust the delay time at 7 MHz use 2 MHz as the reference.
Adjustment point: 1RV303/DM-89(B-5) and 1RV304/DM-89(B-5)
A = 70 ± 5 ns
Specification:
[ns]
A
0
2
7
DNW-A22
6-34
B = +9.2 ± 1.0 dB
[dB]
B
0
2
8
[MHz]
A(*)MAG: 2 dB
[MHz]
[ns]
A
0
2
7
[MHz]
DNW-A22P
DNW-A22/A22P
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