Maintenance
MT930B
Service Manual
Page 6-47
21. Change the FM signal generator modulation frequency to 10 kHz. The
reading should be –17
±
2 dB.
22. Change the FM signal generator frequency deviation to
±
50 kHz p-p.
23. Change the FM signal generator modulation frequency to 100 Hz.
24. Change de-emphasis to EXPAND.
25. Adjust R964 so the output level of rear panel AUDIO #2 is 19
±
0.1 dBm.
26. Repeat step 25 for AUDIO #3, but adjust R994 to get the same result.
RELAY 1 CHECK
Check Procedure:
1. Turn the MENU knob to Menu #5
Receiver Config
.
2. Turn the SELECT knob to page 3 of 6.
3. Press the EDIT pushbutton.
4. Turn the SELECT knob while the cursor is flashing under the left item on
line 3, and turn the display ON and OFF. At this time, verify that the continu-
ity between the C terminal and
NC
or
NO
terminal for
RLY #1
switches
ON
and
OFF
.
Alarm Relay 2 Check
Check Procedure:
1. Turn the MENU knob to Menu #5
RECEIVER CONFIG
.
2. Turn the SELECT knob to page 4 of 6.
3. Press the EDIT pushbutton.
4. Turn the SELECT knob and set the display at the bottom to
ANTENNA
POLARITY
.
5. Press the SAVE pushbutton.
6. Turn the MENU knob to Menu #1
ACTIVE CHANNEL
.
7. Turn the SELECT knob to page 4 of 12.
8. Press the EDIT pushbutton.
9. Press the RIGHT or LEFT pushbutton to move the cursor below
VER
or
HOR
.
10. Turn the SELECT knob, and verify that the continuity between the C termi-
nal and NC or NO terminal for RLY #2 switches ON and OFF.
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 ...