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METAL C adjustment [to step (28)]
(17) Short-circuits TP5/DM-89(D-1) and E702/DM-89(D-1) with a shorting clip.
(18) Connect the output of network analyzer to TP303/DM-89(B-5). GND: E301/DM-89(B-7)
(19) Connect the oscilloscope's CH-2 to TP304/DM-89(B-5). GND: E302/DM-89(B-5)
(20) METAL C, Group delay time adjustment
Adjust the group delay in 3 MHz through 9 MHz.
Adjustment point: 1RV301/DM-89(A-5) and 1RV302/DM-89(A-5)
0 ± 20 ns
Specification:
[ns]
+20
0
_20
3
DNW-A22
(21) Connect the oscilloscope's CH-2 to TP7/DM-89(C-1). GND: E702/DM-89(D-1)
(22) Enter A33 : DM VR 2 of the maintenance mode.
(23) METAL C, Main adjustment
(i) Adjust the level difference at 8 MHz use 2 MHz as the reference.
Adjustment point: A33 : DM VR 2 : MAIN METAL-C-A
Specification:
[dB]
A
0
2
8
DNW-A22
(ii) Set the data value of A33 : DM VR 2 : MAIN METAL-C-B to the identical data value as
MAIN METAL-C-A.
(24) To exit A33 : DM VR 2, press the MENU button once.
DNW-A22/A22P
9
[MHz]
A = +0.5 ± 0.5 dB
A(*)MAG: 1 dB
[MHz]
[ns]
+20
0
_20
3
9
DNW-A22P
[dB]
A
0
2
8
DNW-A22P
6-3. DM-89 Board Replacement
[MHz]
A(*)MAG: 1 dB
[MHz]
6-33
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