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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...............................................................................................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

Summary of content (30 pages)

PAGE 1
LBI-33057 MAINTENANCE MANUAL AEGIS  M-PA  UHF SERVICE SECTION TABLE OF CONTENTS Page DESCRIPTION ................................................................................................................................................ 3 TEST EQUIPMENT......................................................................................................................................... 3 GENERAL. .....................................................................................................
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LBI-33057 TABLE OF CONTENTS (CONTINUED) PAGE Transmitter Troubleshooting...................................................................................................................12 Receiver Troubleshooting........................................................................................................................14 Synthesizer Troubleshooting ...................................................................................................................15 FRONT COVER ASSEMBLY.........
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LBI-33057 DESCRIPTION SPECIALIZED • K19/A4WX01542 RF Test Cable (UDC mount) • K19/A4WX01543 Battery Eliminator ("Dummy Battery") • K19/A4WX01544 RF/Logic Extender Cable • K19/A4WX01604 Discharge Analyzer (checks battery pack capacity and battery chargers) • LBI-38518 Front Cover Test Accessory Kit Manual • SPK9010 Front Cover Test Accessory Kit: See LBI-39157 for service information on the Control Board. See LBI-38834 for service information on the Front Cover Assembly.
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LBI-33057 screws when reassembling the unit. Torque specifications are listed in Table 1. PROGRAMMING • IBM PC Compatible Computer • TQ-3364 • • TQ-3370 TQ-3311 EDACS Programming Manual and Software (includes 5 1/4" and 3 1/2" disks) PC Programming Adapter (Serial Adapter Box and PCto-Adapter Box Interface Cable) CAUTION Always remove the battery pack before disassembling the unit to avoid blowing the fuse or causing other component damage.
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LBI-33057 FRONT AND REAR COVER SEPARATION Lay the radio face down and loosen the four (4) TORX screws (A) on the back of the radio; complete screw removal is not necessary. See Figure 1. Separate the covers by carefully lifting the Rear Cover Assembly straight-up to avoid bending the connector pins between the RF and Control Boards. When reassembling the unit, verify the rubber gasket surrounding the perimeter of the cover is in good condition and it is in the groove.
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LBI-33057 If necessary, the RF Board can be separated from the eggcrate casting. Remove the two (2) Torx screws that secure the Power Amplifier Module and remove the four (4) screws on the chip component side of the board that secure it to the casting. Reassemble the unit in reverse order. Observe screw lengths. CONTROL BOARD ACCESS To gain partial access to the Control Board, remove the five (5) screws (D) securing the shield and board.
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LBI-33057 UDC flex/UDC/Monitor Button/HT Switch Assembly Removal If UDC Flex/UDC/Monitor Button/PTT Switch assembly removal is necessary, first unsolder the microphone. With a spanner wrench, remove the UDC securing screw (the UDC ground pin). Remove the insulator (foam or plastic type) on the inside side-rail of the case. Lift the UDC/Monitor Button/PTT Switch assembly from the side of the case and slide the flex through the slot.
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LBI-33057 ALIGNMENT PROCEDURES This section outlines alignment procedures for the UHF RF Board located in the Rear Cover Assembly. Alignment procedures must be performed in the order presented to insure proper radio operation. Several test procedures are presented which will help isolate a problem if it exists. The circuits in the Front Cover Assembly contain no adjustments and therefore no alignment is necessary.
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LBI-33057 Figure 6 - Test Setup 3. Monitor transmitter frequency and adjust Reference Oscillator U3 to a frequency reading of within 50 Hz (a small trimmer hole is located on top of module). If the ±50 Hz maximum error (at room temperature) cannot be established, Reference Oscillator replacement may be necessary. Table 3 list maximum transmitter errors for the specified temperature range.
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LBI-33057 • Break the connection at TX MOD, J102/P2 pin 1. alignment procedures will verify a near 100% operating synthesizer and receiver stages. • Bias TX MOD into the RF Board to 2.7 Vdc by connecting the junction of the 10K resistors to J102 pin 1. 2nd Local Oscillator 2. Using a 100 µF (or greater) capacitor, couple a 1 kHz, 600 mV rms audio signal into TX MOD, J102 pin 1.
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LBI-33057 Table 3 - Maximum Transmitter Frequency Errors* And Typical VCO Tx Tuning Voltages CHANNEL (MHz) TOLERANCE*(Hz) LOWEST (MHz) HIGHEST(MHz) 485.012500 ±1213 485.011287 485.013713 1.5 Vdc 500.00000 ±1250 499.998750 500.001250 2.5 Vdc 504.987500 ±1263 504.986237 504.988763 3.5 Vdc VCO TUNING VOLTAGE (TX) * Based on specified ±2.5 ppm over the entire operating temperature range 5. Repeat the 12 dB SINAD sensitivity and distortion check for the LOW and HIGH-side test channels.
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LBI-33057 on these assemblies. The troubleshooting test setup should be identical to the set-up used in the ALIGNMENT PROCEDURES section of this manual. Table 5 lists common problems and most likely problem areas. REAR COVER ASSEMBLY The troubleshooting procedures that follow primarily assume a problem has been narrowed to a problem on the RF Board. Transmitter, receiver and synthesizer symptoms/causes are outlined.
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LBI-33057 Table 5 - General Troubleshooting SYMPTOM Completely inoperative (no audio and no LCD indication) At power up, radio beeps: a. twice (once in addition to power up beep) b. continuously at a 2 Hz rate c. continuously at a 2 Hz rate and "NO LOCK" is displayed At power up, display: a. flashes "PERS ERR" b. flashes all segments and the radio beeps. Receiver inoperative or weak(clear mode). Transmitter inoperative or low range.
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LBI-33057 this point should produce ±2.5 kHz deviation. Improper modulation from 300 - 3000 Hz points to a VCO modulation problem. Check the VCO pin 4 for the TX MOD signal. Suspect the VCO if the signal is present and incorrect modulation exists. 2. If improper low-frequency modulation exists (trunked mode low-speed data), first check J102 pin 1 for the proper tone. Next check U3 pin 4 for the tone; suspect C30 if the tone is not present.
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LBI-33057 Squelch Problem A squelch circuit problem (assuming good signal and/or noise is present at 101/P1 pin 4) indicates a problem with Audio Processor U8 on the Control Board. Troubleshooting should begin at the discriminator output Signal trace through the discriminator amp to the Audio Processor. Check the operation of the noise rectifier to verify the noise is being converted into the proper dc voltage. See LBI-39157 for details.
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LBI-33057 Troubleshooting details on the other assemblies located in the Front Cover Assembly can be found LBI38834. These assemblies include the LCD Board and the various flex circuits used in the radio. COMPONENT REPLACEMENT SURFACE MOUNTED COMPONENTS Surface mounted "chip" components should always be replaced using a temperature-controlled soldering system. The solderingtools may be either a temperaturecontrolled soldering iron or a temperature-controlled hotair soldering station.
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LBI-33057 SURFACE MOUNTED INTEGRATED CIRCUIT REPLACEMENT Surface mounted IC soldering and de-soldering techniques are similar to the above outlined procedures for the surface mounted chip components. Use extreme care and observe static precautions when removing or replacing a defective (or suspect) IC. This will prevent any damage to the printed wire board or the surrounding circuitry. Replacement of a surface mounted IC is best completed using a hot-air soldering system.
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LBI-33057 Figure 8 - Battery Packs 18
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LBI-33057 CHARGING THE BATTERY PACKS 2. Complete a full charge cycle using an Ericsson charger. After receiving a new battery pack from the factory, it should be fully charged before it is placed into service. This also applies to batteries that have been stored for long periods. 3. Repeat steps 1 and 2. Performing this deep cycle at least twice should be sufficient to restore battery pack capacity. Chargers are available with nominal charge times of 1 hour (rapid) and 14 (standard) hours.
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LBI-33057 STOP PLATE REPOSITIONING 1. Remove the Control Knob using an M15 hex wrench. 4. Replace the Control Knob and torque the set screw per Table 1. The set screw must align on the flat area of the switch shaft Rotate the knob to test for proper operation. 2. Lift the stop plate using small needle-nose pliers. 3. Reposition the stop plate by aligning the raised bar to the channel marking one (1) number higher than the number of positions required.
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LBI-33057 SET-UP PROCEDURE 1. Program the radio with the low, middle and highside re tune channels in the desired operating frequency band. The low and high-side channels should be 20 MHz apart and the middle channel should be centered between the two. Do not exceed the frequency range limits for the RF Board. 2. Separate the Front and Rear Cover Assemblies and connect the RF/Logic Extender cable between the RF Board and the Control Board. SYNTHESIZER RETUNING 1. Set the radio to the middle retune channel.
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LBI-33057 Network Analyzer Method 1. Remove the solder mask on the solder side of the RF Board at the thin run between the output of FL4 and the input of A6 (A6 pin 1). Cut this run. 2. Solder the center conductor of a small 50-ohm coax cable to FL4's output at the cut run. Solder the coax shield near FL4. 3. Terminate the radio's antenna with a 50-ohm load. 4.
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LBI-33057 RF BOARD - MODULE AND IC DATA A1 (19C337063, Rev. 1) (19C337315, Rev. 1) POWER CONTROLLER 19C337063 A2 (19C337062, Rev. 2) (19C336876, Rev.
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LBI-33057 RF BOARD - MODULE AND IC DATA A4 (19D438605, Sh. 1, Rev. 2) (19D438604, Sh. 1, Rev. 4) (19D438604, Sh. 2, Rev.
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LBI-33057 RF BOARD - MODULE AND IC DATA A5 (19C852056, Sh. 1, Rev. 0) (19C852057, Sh. 1, Rev.
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LBI-33057 RF BOARD - MODULE AND IC DATA A6 (19B235081, Sh. 1, Rev. 2) (19C337073, Rev.
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LBI-33057 RF BOARD - MODULE AND IC DATA U2 PRESCALER 19A704287P2 U3 13.
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LBI-33057 RF BOARD - MODULE AND IC DATA U4 RF POWER AMPLIFIER 19A705419 U5 MIXER 19A705706P2 U6 RECEIVER BACKEND 19A704619P1 28
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LBI-33057 RF BOARD - MODULE AND IC DATA (This page left intentionally blank) 29
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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.