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OXIDE Y adjustment [to step (56)]
(42) Turn RV103/DM-89(E-5) counterclockwise fully when exist it.
n
RV103 is not equipped on the DM-89 board of the LOT Nos. 407 and higher.
(43) Short-circuits TP4/DM-89(E-1) and E702/DM-89(D-1) with a shorting clip.
(44) Connect the output of network analyzer to TP103/DM-89(E-6). GND: E103/DM-89(F-6)
(45) Connect the oscilloscope's CH-2 to TP104/DM-89(F-5). GND: E104/DM-89(G-5)
(46) OXIDE Y, Group delay adjustment
Adjust the delay time at 8 MHz use 4 MHz as the reference.
Adjustment point: 1RV104/DM-89(E-5)
Specification: DNW-A22: A = 40 ± 5 ns
DNW-A22P: A = 40 ± 3 ns
[ns]
A
0
4
DNW-A22
(47) Enter A33 : DM VR 2 of the maintenance mode.
(48) Connect the oscilloscope's CH-2 to TP3/DM-89(E-1). GND: E702/DM-89(D-1)
(49) OXIDE Y, Main adjustment
(i) Adjust the level difference at 8 MHz use 2 MHz as the reference.
Adjustment point: A33 : DM VR 2 : MAIN OXIDE-Y-A
Specification:
[dB]
B
0
2
DNW-A22
(ii) Set the data value of A33 : DM VR 2 : MAIN OXIDE-Y-B to the identical data value as MAIN
OXIDE-Y-A.
(50) To exit A33 : DM VR 2, press the MENU button once.
DNW-A22/A22P
8
[MHz]
DNW-A22:
DNW-A22P:
A(*)MAG: 1 dB
8
[MHz]
[ns]
A
0
B = +2.0 ± 0.5 dB
B = +2.5 ± 0.5 dB
[dB]
B
0
2
6-3. DM-89 Board Replacement
4
8
[MHz]
DNW-A22P
A(*)MAG: 1 dB
8
[MHz]
DNW-A22P
6-37
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