Maintenance
Page 6-40 Service Manual
MT930B
Video Filter Switching Operation Check
Check Conditions:
•
Video signal: Video sweep
•
Frequency Deviation: 27.6 MHz p-p
•
Pre-emphasis: 525
•
RF level: –30 dBm
•
C/N ratio: 30 dBm or less
•
IF BW: 36 MHz
•
De-emphasis: 525
•
Condition 1:
Video signal: NTSC
Pre-emphasis: 525
Frequency Deviation: 27.6 MHz p-p
•
Condition 2:
Video signal: NTSC
Pre-emphasis: 525
Frequency Deviation: 18.4 MHz p-p
Adjustment Procedure:
1. Using the conditions in Condition 1, connect a video analyzer to
COMPOSITE OUT, and check that the latest specifications for C/L gain,
delay, and multiburst are met. If they are not met, readjust C311, R311,
RV03, and RV06.
2. Set the video signal as in Condition 2, and set the de-emphasis to 625.
Connect a video analyzer to COMPOSITE OUT, and set the video filter to
4.2, and check that the latest specifications for C/L gain, delay, and
multiburst are met. If they are not met, readjust RV09, RV12, etc.
3. Connect a video analyzer to VIDEO #1, and set the video filter to 5.0. Check
that the latest specifications for C/L gain, delay, and multiburst are met. If
they are not met, readjust FV03.
4. Connect a video analyzer to VIDEO #1, and set the video filter to 5.5. Check
that the latest specifications for C/L gain, delay, and multiburst are met. If
they are not met, readjust FV02.
5. Connect a video analyzer to VIDEO #1, and set the video filter to 6.0. Check
that the latest specifications for C/L gain, delay, and multiburst are met. If
they are not met, readjust FV01.
Summary of Contents for mt930b
Page 3: ...MT930B Service Manual Page i ...
Page 10: ...General Information Page 1 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 22: ...Controls and Connections Page 3 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 86: ...Options Maintenance Page 7 2 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 90: ...Drawings Page 9 2 Service Manual MT930B 10264 Figure 9 1 MT930B Block Diagram 1 ...
Page 91: ...Drawings MT930B Service Manual Page 9 3 10265 Figure 9 2 MT930B Block Diagram 2 ...
Page 92: ...Drawings Page 9 4 Service Manual MT930B 10266 Figure 9 3 MT930B Block Diagram 3 ...
Page 93: ...Drawings MT930B Service Manual Page 9 5 10267 Figure 9 4 MT930B Block Diagram 4 ...
Page 94: ...Drawings Page 9 6 Service Manual MT930B 10268 Figure 9 5 MT930B Head Phone Schematic ...
Page 95: ...Drawings MT930B Service Manual Page 9 7 10269 Figure 9 6 MT930B RF PC Board Schematic ...
Page 96: ...Drawings Page 9 8 Service Manual MT930B 10270 Figure 9 7 MT930B Converter Module Schematic ...
Page 97: ...Drawings MT930B Service Manual Page 9 9 10271 Figure 9 8 MT930B Main PC Board Sheet 1 of 3 ...
Page 98: ...Drawings Page 9 10 Service Manual MT930B Figure 9 9 MT930B Main PC Board Sheet 2 of 3 ...
Page 99: ...Drawings MT930B Service Manual Page 9 11 10273 Figure 9 10 MT930B Main PC Board Sheet 3 of 3 ...
Page 100: ...Drawings Page 9 12 Service Manual MT930B 10274 Figure 9 11 MT930B Power Supply Schematic ...
Page 101: ...Drawings MT930B Service Manual Page 9 13 10275 Figure 9 12 MT930B IF Filter Block Schematic ...
Page 102: ...Drawings Page9 14 Service Manual MT930B 10276 Figure 9 13 MT930B Audio IF PB01 Schematic ...
Page 103: ...Drawings MT930B Service Manual Page 9 15 10277 Figure 9 14 MT930B Audio Out Schematic ...