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Maintenance
Page 6-48
Service Manual
MT930B
AUX Input Check
Check procedure:
1. Turn the MENU knob to #3
ALARM SET UP
.
2. Turn the SELECT knob to page 2 of 2.
3. Press the EDIT pushbutton.
4. Press the RIGHT or LEFT pushbutton to move the cursor below
AUX IN
(near the center).
5. Turn the SELECT knob, and set the right side of line 3 to
ON LO TRIGGR
.
6. Verify that the ALARM display lights when both of the AUX terminals are
shorted and go out when the short is removed.
Video Presence Check
Check Procedure:
1. Turn the MENU knob to #3
ALARM SET UP
.
2. Verify that the page number is 1 of 2, and press the EDIT pushbutton.
3. Press the RIGHT or LEFT pushbutton to move the cursor below
VIDEO
.
4. Turn the SELECT knob, and set the right side of line 3 to
NO VID
.
5. Press the SAVE pushbutton.
6. Receive a good RF modulated signal.
7. Turn the MENU knob to Menu #1
ACTIVE CHANNEL
.
8. Turn the SELECT knob to page 2 of 12.
9. Verify
that
NO VID
does not appear at the right side of line 3.
10. Turn off the video modulation, and verify that
NO VID
is displayed at the
right side of line 3.
LNB Power Check
Check Procedure:
1. Connect a DC voltmeter to RF #1, and observe the LNB voltage.
2. Set the LNB to 0 V, and check that the voltage is within 0
±
0.01 V.
3. Set the LNB to 13 V, and check that the voltage is within 12.8 to 13.9 V.
4. Set the LNB to 18 V, and check that the voltage is within 18.1 to 19.9 V.
5. Set the LNB to 18 V, connect a load with a current flow of 300
±
3 mA, and
check that the voltage is within 12.8 to 13.9 V.
6. Set the LNB to 18 V, connect a load with a current flow of 500
±
5 mA, and
check that the voltage is within 18.1 to 19.9 V.
Содержание mt930b
Страница 3: ...MT930B Service Manual Page i ...
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 ...