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Aegis M-PA UHF Service Manual

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DESCRIPTION ................................................................................................................................................ 3
TEST EQUIPMENT......................................................................................................................................... 3
GENERAL. ................................................................................................................................................... 3
SPECIALIZED.............................................................................................................................................. 3
PROGRAMMING ......................................................................................................................................... 4
FRONT COVER TEST ACCESSORY KIT...................................................................................................... 4
DISASSEMBLY / REASSEMBLY................................................................................................................... 4
TOOLS REQUIRED...................................................................................................................................... 4
FRONT AND REAR COVER SEPARATION............................................................................................... 5
RF BOARD ACCESS.................................................................................................................................... 5
CONTROL BOARD ACCESS ...................................................................................................................... 6
SPEAKER, MICROPHONE AND FLEX CIRCUIT ACCESS....................................................................... 6
UDC flex/UDC/Monitor Button/HT Switch Assembly Removal................................................................ 7
Earlier Front Cover Assembly Keypad Flex Removal................................................................................ 7
Later Front Cover Assembly Keypad flex Removal................................................................................... 7
Speaker Flex Removal.............................................................................................................................. 7
LCD BOARD ACCESS................................................................................................................................. 7
ALIGNMENT PROCEDURES......................................................................................................................... 8
SET-UP PROCEDURE.................................................................................................................................. 8
TRANSMITTER ALIGNMENT.................................................................................................................... 8
Reference Oscillator ................................................................................................................................. 9
Modulation Adjustments........................................................................................................................... 9
Transmitter Distortion Test .................................................................................................................... 10
RECEIVER ALIGNMENT.......................................................................................................................... 10
2nd Local Oscillator ............................................................................................................................... 10
Quadrature Detector ............................................................................................................................... 10
12 dB SINAD and Distortion Tests......................................................................................................... 10
TRACKING AND CHANNEL DATA............................................................................................................ 11
TROUBLESHOOTING .................................................................................................................................. 11
REAR COVER ASSEMBLY....................................................................................................................... 12
ericssonz
MAINTENANCE MANUAL
AEGIS™ ™ M-PA™ ™ UHF
SERVICE SECTION

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LBI-33057
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  • Page 1: Table Of Contents

    LBI-33057 MAINTENANCE MANUAL AEGIS™ ™ M-PA™ ™ UHF SERVICE SECTION TABLE OF CONTENTS Page DESCRIPTION ..............................3 TEST EQUIPMENT............................3 GENERAL..............................3 SPECIALIZED.............................. 3 PROGRAMMING ............................4 FRONT COVER TEST ACCESSORY KIT...................... 4 DISASSEMBLY / REASSEMBLY........................4 TOOLS REQUIRED............................4 FRONT AND REAR COVER SEPARATION....................
  • Page 2 LBI-33057 TABLE OF CONTENTS (CONTINUED) PAGE Transmitter Troubleshooting........................12 Receiver Troubleshooting........................14 Synthesizer Troubleshooting ........................15 FRONT COVER ASSEMBLY........................15 COMPONENT REPLACEMENT ........................16 SURFACE MOUNTED COMPONENTS.....................16 SURFACE MOUNTED COMPONENT.......................16 SURFACE MOUNTED COMPONENT.......................16 SURFACE MOUNTED INTEGRATEDCIRCUIT REPLACEMENT............17 MODULE REPLACEMENT........................17 WEATHERPROOF INTEGRITY........................17 BATTERY PACKS............................17 CHARGING THE BATTERY PACKS......................19 REDUCED CAPACITY CONDITION ......................19 CONTROL KNOB STOP PLATE........................19 STOP PLATE REPOSITIONING ........................20...

  • Page 3: Description

    Regulated DC Power Supply, 5 - 9 Vdc adjustable, tional tests will require the appropriate test equipment and 5 amperes maximum a second Aegis portable or mobile radio. Also, radios will require access to a local trunked site and a second portable •...

  • Page 4: Programming

    LBI-33057 screws when reassembling the unit. Torque specifica- PROGRAMMING tions are listed in Table 1. • IBM PC Compatible Computer • CAUTION TQ-3364 EDACS Programming Manual and Software (includes 5 Always remove the battery pack before 1/4" and 3 1/2" disks) disassembling the unit to avoid blowing the fuse •...

  • Page 5: Front And Rear Cover Separation

    LBI-33057 FRONT AND REAR COVER RF BOARD ACCESS SEPARATION Holes are located in the RF Board shield for align- Lay the radio face down and loosen the four (4) ment of the Reference Oscillator (U3), Modulation Bal- ® TORX screws (A) on the back of the radio; complete ance pot (R18), VCO Modulation pot (R19), 2nd Local screw removal is not necessary.

  • Page 6: Control Board Access

    LBI-33057 If necessary, the RF Board can be separated from the CAUTION: Installation of screws that are longer than eggcrate casting. Remove the two (2) Torx screws that the originals may damage the LCD Board, flex circuits or secure the Power Amplifier Module and remove the four the threads.

  • Page 7: Udc Flex/Udc/Monitor Button/Ht Switch Assembly Removal

    LBI-33057 UDC flex/UDC/Monitor Button/HT Switch Assembly LCD BOARD ACCESS Removal To remove the LCD Board, partial removal (actually If UDC Flex/UDC/Monitor Button/PTT Switch as- repositioning of the top areas) of the Keypad Flex is re- sembly removal is necessary, first unsolder the micro- quired.

  • Page 8: Alignment Procedures

    LBI-33057 switch in the OFF position to direct the speaker ALIGNMENT PROCEDURES audio to its speakers leads and to the distortion analyzer. Connect the PC Programmer to the This section outlines alignment procedures for the UDC. UHF RF Board located in the Rear Cover Assembly. Alignment procedures must be performed in the order 3.

  • Page 9: Reference Oscillator

    LBI-33057 Figure 6 - Test Setup 3. Monitor transmitter frequency and adjust Refer- Reference Oscillator ence Oscillator U3 to a frequency reading of NOTE within 50 Hz (a small trimmer hole is located on top of module). If the ±50 Hz maximum error (at Reference Oscillator U3 is factory adjusted and room temperature) cannot be established, Refer- should not normally need readjustment Use a...

  • Page 10: Transmitter Distortion Test

    LBI-33057 • alignment procedures will verify a near 100% operating Break the connection at TX MOD, J102/P2 pin synthesizer and receiver stages. • Bias TX MOD into the RF Board to 2.7 Vdc by 2nd Local Oscillator connecting the junction of the 10K resistors to J102 pin 1.

  • Page 11: Tracking And Channel Data

    Front Cover Assembly, the Control Board or aligning circuitry, or replacing modules or other compo- the Aegis Module for detailed troubleshooting procedures nents which obsolete the previously programmed values.

  • Page 12: Rear Cover Assembly

    LBI-33057 on these assemblies. The troubleshooting test setup 4. If low RF power is a symptom, check the opera- should be identical to the set-up used in the tion of Power Controller AI and Q1. PWR SET ALIGNMENT PROCEDURES section of this manual. on J101/PI pin 1 should be approximately 1.0 Table 5 lists common problems and most likely problem Vdc in low-power mode and 4.0 Vdc in high-...
  • Page 13 Aegis Mode Problems 1. Verify outside addresses and data polarity. 2. If optionally equipped for encryption, verify correct keys are loaded and selected. 3. Verify CUE codes. 4. Problem on Control Board with Aegis circuitry. 5. See "Trunked Mode Problems" above.

  • Page 14: Receiver Troubleshooting

    LBI-33057 this point should produce ±2.5 kHz deviation. If the 1 kHz audio is present, troubleshoot the audio circuits in the Front Cover Assembly. Noise Improper modulation from 300 - 3000 Hz points levels on RX DISC with no RF input should be to a VCO modulation problem.

  • Page 15: Synthesizer Troubleshooting

    LBI-33057 A5 pin II (input) for 7.5 Vdc. Replace A5 if the Squelch Problem inputs are good and the output is not. A squelch circuit problem (assuming good signal 4. Using a frequency counter with a high impedance and/or noise is present at 101/P1 pin 4) indicates a prob- probe or amp, check U1 pin 2 for the 13.2 MHz lem with Audio Processor U8 on the Control Board.

  • Page 16: Component Replacement

    LBI-33057 Troubleshooting details on the other assemblies lo- air system is used, direct the heat to the terminals cated in the Front Cover Assembly can be found LBI- of the component. Use extreme care with the sol- 38834. These assemblies include the LCD Board and the dering equipment to prevent damage to the various flex circuits used in the radio.

  • Page 17: Surface Mounted Integratedcircuit Replacement

    LBI-33057 pins. If a hot-air system is employed, use an appropriate SURFACE MOUNTED INTEGRATED tip that will localize the heat on the pins and not on sur- CIRCUIT REPLACEMENT rounding chip components. Solderwick® or a vacuum de-soldering iron will also remove the solder if a hot-air Surface mounted IC soldering and de-soldering station is not available.
  • Page 18 LBI-33057 Figure 8 - Battery Packs...

  • Page 19: Charging The Battery Packs

    LBI-33057 2. Complete a full charge cycle using an Ericsson CHARGING THE BATTERY PACKS charger. After receiving a new battery pack from the factory, 3. Repeat steps 1 and 2. Performing this deep cycle it should be fully charged before it is placed into service. at least twice should be sufficient to restore bat- This also applies to batteries that have been stored for tery pack capacity.

  • Page 20: Stop Plate Repositioning

    LBI-33057 4. Replace the Control Knob and torque the set STOP PLATE REPOSITIONING screw per Table 1. The set screw must align on 1. Remove the Control Knob using an M15 hex the flat area of the switch shaft Rotate the knob to wrench.

  • Page 21: Set-Up Procedure

    LBI-33057 from the RF Board with a dc coupled oscillo- SET-UP PROCEDURE scope. The monitoring point is J101 pin 4. 1. Program the radio with the low, middle and high- 9. Apply a 110 mV rms, 1 kHz tone to the TQ- side re tune channels in the desired operating fre- 3370's modulation input.

  • Page 22: Network Analyzer Method

    LBI-33057 A less desirable alternative using the same tuning Network Analyzer Method sequence can be achieved by varying the signal genera- 1. Remove the solder mask on the solder side of the tor's level and tuning for best quieting (SINAD). No coax RF Board at the thin run between the output of cable connections are required using this procedure.

  • Page 23: Ic Data

    LBI-33057 RF BOARD - MODULE AND IC DATA (19C337063, Rev. 1) (19C337315, Rev. 1) POWER CONTROLLER 19C337063 (19C337062, Rev. 2) (19C336876, Rev. 0) IF AMPLIFIER 19C336876G1...
  • Page 24 LBI-33057 RF BOARD - MODULE AND IC DATA (19D438605, Sh. 1, Rev. 2) (19D438604, Sh. 1, Rev. 4) (19D438604, Sh. 2, Rev. 3) 19A438605...
  • Page 25 LBI-33057 RF BOARD - MODULE AND IC DATA (19C852056, Sh. 1, Rev. 0) (19C852057, Sh. 1, Rev. 1) PLL LOW PASS FILTER/REGULATOR 19C852056G1...
  • Page 26 LBI-33057 RF BOARD - MODULE AND IC DATA (19B235081, Sh. 1, Rev. 2) (19C337073, Rev. 1) UHF RF AMPLIFIER 19B235081 SYNTHESIZER 19B800902P4...
  • Page 27 LBI-33057 RF BOARD - MODULE AND IC DATA PRESCALER 19A704287P2 13.2 MHz REFERENCE OSCILLATOR 19B801351P15...
  • Page 28 LBI-33057 RF BOARD - MODULE AND IC DATA RF POWER AMPLIFIER 19A705419 MIXER 19A705706P2 RECEIVER BACKEND 19A704619P1...
  • Page 29 LBI-33057 RF BOARD - MODULE AND IC DATA (This page left intentionally blank)
  • Page 30 Ericsson Inc. Private Radio Systems Mountain View Road Lynchburg, Virginia 24502 1-800-528-7711 (Outside USA, 804-528-7711) Printed in U.S.A.

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