Astec Power Supply Service Manual [TOP]
Astec Power Supply Service Manual ->->->-> https://bltlly.com/2tb3mK
The MTR2000 has a 100 watt DC power jack on the back panel, with a 10 amp fuse that limits the maximum input current to 100 amps. AC can be powered from a 9 volt input if you are using an isolation transformer or a 12 volt input if you are using a 12 volt isolation transformer. For additional information on antenna relay selection see the 6881096E90-F manual linked below. If you do not have a 9 volt or 12 volt isolation transformer to power the station from a battery, you can buy a 12 volt DC to AC power supply with a suitable isolation transformer for around $40 - $50.
The MTR2000 can be powered from a 9 volt battery pack or from a 12 volt car battery, or an AC power supply using a simple AC to DC power supply. In the car battery mode the unit will not transmit on AM, only on the CW output. If the car battery is over about 12.5 volts it will trip the regulator, so you must use a 12.5 volt power supply with an isolation transformer (NEMA 6 or 13, your author doesn't know). The MTR2000 can be powered from different types of AC systems: 120 VAC, 208 VAC, 230 VAC, 208 VAC with a zapped filter capacitor, or 230 VAC with a zapped filter capacitor. Transmitter output power is limited to 100 watts CW and 10 watts SSB, and is controlled by the RF Gain control on the back panel.
If your MTR2000 is acting up, there is a good chance it is not functional and there is a good chance that it is a bad AC Power supply... The Power supply module for the unit is a Motorola part (3AC1-2190). It will be marked with the part number, MO24P, and the serial number. Motorola made the four power supply modules at the time; they are identical. The one in your unit has the code 96, which is for an MTR2000.
The MTR2000 manual was designed to be a typical self-service replacement manual. It is not very detailed, but does provide a lot of information on how to do field maintenance. There is no schematic for the unit and no instructions for removal of the control modules; just the instructions for performing the field swap and re-programming the RF board.
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