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Maintenance
Page 6-30
Service Manual
MT930B
Return Loss Check
Check Conditions:
•
Use an Advantest R3762A vector analyzer (or equivalent).
•
Check whether a DC block is inserted between the terminal to be measured
and the vector analyzer, and that any LNB is disconnected.
•
Input: J101, J102, J103, or J104, 950 to 1210 MHz, –10 dBm (75
Ω
)
•
RF AGC voltage: Check that all RF module circuits are operational.
•
MGC: At a position corresponding to –30 dBm at J402
Check Procedure:
Check that the return loss at J101, J102, J103, and J104 is 9 dB or more.
Check Specifications:
−−−−
Input return loss:
±
9 dB
IF Filter Adjustment
Adjustment Conditions:
•
Connect the equipment as in Figure 6-14.
10289
Figure 6-11. Equipment Setup for Filter Adjustments
•
Input level: 0 dBm
16, 18, 22, and 25 MHz Bandpass Frequency (BPF) Adjustment
Adjustment Procedure:
1. See Figures 6-15 and 6-16, and select IF BW 16 MHz. Call up the file
16MHz_BPF, and adjust the variable attenuator so the point of intersection
within the frame and marker
▼
1 (70 MHz point) match.
Содержание mt930b
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Страница 10: ...General Information Page 1 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 22: ...Controls and Connections Page 3 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 86: ...Options Maintenance Page 7 2 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 90: ...Drawings Page 9 2 Service Manual MT930B 10264 Figure 9 1 MT930B Block Diagram 1 ...
Страница 91: ...Drawings MT930B Service Manual Page 9 3 10265 Figure 9 2 MT930B Block Diagram 2 ...
Страница 92: ...Drawings Page 9 4 Service Manual MT930B 10266 Figure 9 3 MT930B Block Diagram 3 ...
Страница 93: ...Drawings MT930B Service Manual Page 9 5 10267 Figure 9 4 MT930B Block Diagram 4 ...
Страница 94: ...Drawings Page 9 6 Service Manual MT930B 10268 Figure 9 5 MT930B Head Phone Schematic ...
Страница 95: ...Drawings MT930B Service Manual Page 9 7 10269 Figure 9 6 MT930B RF PC Board Schematic ...
Страница 96: ...Drawings Page 9 8 Service Manual MT930B 10270 Figure 9 7 MT930B Converter Module Schematic ...
Страница 97: ...Drawings MT930B Service Manual Page 9 9 10271 Figure 9 8 MT930B Main PC Board Sheet 1 of 3 ...
Страница 98: ...Drawings Page 9 10 Service Manual MT930B Figure 9 9 MT930B Main PC Board Sheet 2 of 3 ...
Страница 99: ...Drawings MT930B Service Manual Page 9 11 10273 Figure 9 10 MT930B Main PC Board Sheet 3 of 3 ...
Страница 100: ...Drawings Page 9 12 Service Manual MT930B 10274 Figure 9 11 MT930B Power Supply Schematic ...
Страница 101: ...Drawings MT930B Service Manual Page 9 13 10275 Figure 9 12 MT930B IF Filter Block Schematic ...
Страница 102: ...Drawings Page9 14 Service Manual MT930B 10276 Figure 9 13 MT930B Audio IF PB01 Schematic ...
Страница 103: ...Drawings MT930B Service Manual Page 9 15 10277 Figure 9 14 MT930B Audio Out Schematic ...
Страница 104: ...Drawings Page 9 16 Service Manual MT930B 10278 Figure 9 15 MT930B Audio PW01 PC Board Schematic ...