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Summary of Contents for Ericsson MPI-II VHF
- Page 1 LBI-38557A Mobile Communications SERVICE SECTION MPI-II VHF PERSONAL RADIO Ericsson GE Mobile Communications Inc. Mountain View Road Lynchburg, Virginia 24502 Copyright January 1991, Ericsson GE Mobile Communications, Inc. Printed in U.S.A. Maintenance Manual...
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Page 2: Table Of Contents
1. Turn the radio OFF. 2. Place thumb on bottom of battery pack and press battery pack toward the top of the radio as shown in Figure 1. 3. While pressing the battery pack toward the top of the radio, push bottom of battery pack away from the radio. -
Page 3: Front Cover
The Transmitter is tuned at the high end of the band, with retuning recommended for optimum operation when another frequency is selected. This section provides procedures for aligning and testing the MPI-II VHF (136-174 MHz) Personal Radio. -
Page 4: Test Equipment
750 mA ( 10 mA) for 7.5V supplies. Check the output power. The output power should be equal watt radio, or 10 volts ( 0.1 volts) for a 4 watt radio. Connect the power supply to the dummy battery as shown in Figure to or greater than the minimum power as listed in the table above. -
Page 5: Figure 4 - Location Of Tuning Controls And Test Points
LBI-38557 LBI-38557 Figure 4 - Location of Tuning Controls and Test Points... -
Page 6: Receiver Alignment
The bench power should be set for 7.5 Vdc ( 0.1 Vdc) for a 2 watt radio, or 10.0 Vdc ( 0.1 Vdc) for a 4 watt radio. If a battery pack is used, it should be fully charged. Typical battery pack voltage should be within 20% of set voltage over its full discharge cycle. -
Page 7: Receiver
Check to see if Channel Guard is being gener- TEST input to the microprocessor to ground during ated at CG ENC output by microprocessor power-up. The radio can be taken out of test mode switching outputs U701 pins 34-37. by recycling the power without TEST grounded. -
Page 8: Component Replacement
0 dBm. Prescaler U202 Connect 4.3 Vdc to pin 3 to VCO U204. With the radio in receive, monitor the frequencies of the VCO at pin 5 through a 100 pF coupling capacitor. Short pin 6 to U202 to ground to cause divide by 65 to occur. -
Page 9: Surface Mount Component Replacement
1 volt per cell. For MPI-II radio batteries this equals 6 volts output for 2 watt radios and 8 volts output for 4 watt radio. Refer to the typical Ni-Cad cell discharge curve in Figure 9. -
Page 10: Modification Instructions
LBI-38557 2. A full charge cycle using an appropriate Ericsson GE charger. 3. This procedure should be repeated again. Performing the rated discharge and charge cycle at least twice b. If either crystal filter can does not have a dot on should sufficiently restore the battery.
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