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Maintenance
MT930B
Service Manual
Page 6-21
TUNING MEASUREMENTS
Set up the equipment as in Figure 6-8.
10295
Figure 6-5. Tuning Measurement Equipment Setup
AFC Range Measurement
Measurement Conditions:
•
Frequency: 1210 MHz, –30 dBm
•
AFC: ON
Measurement Procedure:
1. Confirm that the output frequency at 70 MHz TEST OUT is 70 MHz
±
100 kHz.
2. Change the input signal to 1212 MHz.
3. Confirm that the output frequency at J041 is 70 MHz
±
100 kHz.
4. Change the input signal to 1208 MHz.
5. Confirm that the output frequency at J041 is 70 MHz
±
100 kHz.
6. Set AFC to OFF.
7. Repeat steps 1 through 5, but confirm that the output frequency at J041 is
70
±
2 MHz.
Measurement Specification:
AFC Range:
±
2.0 MHz
Fine Tuning Range Measurement
Measurement Procedure:
1. Perform all steps with the AFC switch in both ON and OFF positions.
2. Measure the output frequency at 70 MHz TEST OUT.
3. Rotate the FINE TUNE control fully CCW, measure the output frequency at
J041, and calculate this figure minus the frequency in step 2.
4. Rotate the FINE TUNE control fully CW, measure the output frequency at
J041, and calculate this figure minus the frequency in step 2.
Measurement Specification:
Fine Tuning Range:
±
2.0 MHz
Содержание mt930b
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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 ...