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DANIELS

ELECTRONICS LTD.

TN100 System Installation and Troubleshooting

Operational Troubleshooting

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 require +9.5 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 (select +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).

43 Erie Street

Victoria, B.C.

Canada V8V 1P8

Page 6 of 9

Toll Free

Canada & U.S.A.

Phone:

1-800-664-4066

Fax:

1-877-750-0004

TECHNICAL NOTES

MT-3 Radio Systems

International

Phone:

250-382-8268

Fax:

250-382-6139

Internet

e-mail:

[email protected]

web:

www.danelec.com

TN100 Rev 3-0-0 Sep 08