Daniels Electronics MT-3 Series, Инструкция по установке и устранению неисправностей

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DANIELS DANIELS
ELECTRONICS LTD. ELECTRONICS LTD.
TM TM
TN100 System Installation and Troubleshooting
MT-3 Radio Systems
9. The system monitor has either a fuse (optional) or a fuse bypass jumper. Check the fuse if it is
installed (rear panel). If no fuse is installed, remove the system monitor and test pins B2 and B4 on the
rear of the monitor for continuity. There should be a connection between these pins to provide the power
link.
10. Most modules r9.5 Vdc power (internally regulated at the system monitor) as well as +13.8
Vdc (nominal supply voltage). If the system monitor is not functioning properly, this voltage may not be
present. Check for +9.5 volts at the system monitor test jacks (9.5 Volts regulated). If +9.5 Vdc
is not present, the system monitor fuse is good and +13.8 Vdc is present then a problem with the system
monitor exists. Refer to the system monitor instruction manual for further information on troubleshoot-
ing.
1.3 M-3 Motherboard Fuse Keeps Blowing
1. If lightning has been reported in the area, check the transient protection diodes TRZ1 and TRZ2 on
the motherboard. Replace if they are shorted or damaged.
2. Check the supply voltage for reversed connections. If the supply voltage was reversed, correct the sit-
uation and replace the fuse.
3. If a power amplifier is part of the system check that its output is at 30 watts maximum. It is possible
to drive these units to an output of 50 watts. Under these conditions the fuse rating may be exceeded.
2.0 Transmitters
2.1 Low or No RF Output
1. Confirm all RF connectors are securely fastened.
2. Ensure the transmitter module(s) are fully plugged in to the subrack and the quick release fasteners
are in the locked position.
3. Check power supplies by measuring them at the system monitor (section 1.2, step 6). Ensure there is
no voltage drop across the DC power supply cables to the subrack when all transmitters are keyed (max-
imum current). Install heavier gauge wire if required.
4. If a power amplifier is installed, confirm the exciter level and the primary power are set for 30 watts
power out (nominal supply voltage at +13.8 Vdc).
Operational Troubleshooting
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TECHNICAL NOTES
TN100 Rev 3-0-0 Sep 08 © Copyright 2008 Daniels Electronics Ltd. All rights reserved.
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