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800 MHz TRUNKED MOBILE RADIO
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INITIAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRANSMITTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PREVENTATIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MECHANICAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ANTENNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE BOTTOM COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE TOP COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE DUPLEXER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE RF BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE AUDIO BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE FRONT CAP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE AUDIO AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE DUPLEXER/INTERFACE BOARD . . . . . . . . . . . . . . . . . .
TO REMOVE THE SYSTEM BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHIP COMPONENT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE CHIP COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REPLACE CHIP COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SELF DIAGNOSTICS/ERROR MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . .
SYMPTOMS AND CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST MODE COMMANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DEFAULT CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHANNEL FREQUENCY SELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST MODE COMMANDS AND FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . .
SINGLE KEY TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THREE KEY FUNCTION TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE MANUAL
SERVICE SECTION
TABLE OF CONTENTS
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Related Manuals for Ericsson LBI-38953
Summary of Contents for Ericsson LBI-38953
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Page 1: Table Of Contents
LBI-38953 MAINTENANCE MANUAL SERVICE SECTION 800 MHz TRUNKED MOBILE RADIO TABLE OF CONTENTS DESCRIPTION ......... . . - Page 2 CONTROL SIGNAL FLOW DIAGRAM ......POWER DISTRIBUTION DIAGRAM ......Copyright© June 1993, Ericsson GE Mobile Communications Inc.
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Page 3: Description
LBI-38953 tions to the power source will cause excessive voltage drops DESCRIPTION and faulty operation. When ground connections are not made directly to the battery, the connection from the battery to vehicle chassis must be checked for low resistance. A high... -
Page 4: To Remove The Bottom Cover
LBI-38953 board, and front cap assembly. Refer to the Assembly Dia- 2. Pry off the friction fit covers covering the RF board. grams located in LBI-38952 when assembling or disassem- bling the radio or replacing component boards. 3. Gently pry interconnect plug P702 from the logic and RF boards using a small standard screwdriver. -
Page 5: To Remove The Logic Board
LBI-38953 3. Disconnect interconnecting cables between the audio CHIP COMPONENT amplifier board and the system board. REPLACEMENT TO REMOVE THE LOGIC BOARD A1 The procedure for removing chip components is given below. Replacement procedures for other unique compo- 1. Remove the top and bottom covers, Front Cap Assem-... -
Page 6: Troubleshooting Procedures
LBI-38953 • 2. Place the "tinned" end of the component on the "tinned" Routes signals between the RF, Logic Board – pad on the board and simultaneously touch the compo- Audio, And Control Boards nent and the pad with a well "tinned" soldering iron Contains the EEPROM for the ra- –... -
Page 7: Symptoms And Checks
LBI-38953 SYMPTOMS AND CHECKS SYMPTOMS CHECKS Handset Blank On Power Refer to the Power Distribution Block Diagram. Check for filtered A+ to the handset at J701-3, 8 volts at J702-6 or switched A+ at J905-5 (system board). Radio Will Not Go Into The radio must be PC programmed to enable the test mode. - Page 8 LBI-38953 SYMPTOMS AND CHECKS (CONTINUED) SYMPTOMS CHECKS Distorted TX Audio Check grounding between all Boards and the casting. Check the TX MOD input to the RF Board. If distorted, a faulty Audio Board is likely. Check the mute commands. If incorrect a faulty Logic Board is likely.
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Page 9: Test Preparation
LBI-38953 CHANNEL FREQUENCY SELECT TEST PREPARATION To select a channel other than the frequencies in the To test the MDR radio, a test mode must be entered to current trunked set, press CLR followed by a 2 to 4 digit disable the normal channel scanning mode for GE-MARC channel number (10-1208) followed by "CLR". -
Page 10: Single Key Tests
LBI-38953 Reset to default conditions Mode (STO) Invoke a new function STO returns the radio to the power-up state. I.e. [PASSED] appears in the display and the radio returns to the Exit test mode normal mode of operation. VOLUP Ramp volume up... - Page 11 LBI-38953 Reset to Frequency 1(7) GE-MARC TONE TABLE The (7) command resets the radio to frequency 1 of the All GE-MARC tones numbers and their respective fre- selected frequency set. quencies are provided in Table 1 below. Tone Select (#)
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Page 12: Three Key Function Tests
LBI-38953 Push-To-Push (PTT) Microphone Audio Off (FCN 0 5) When the Push-To-Talk button on the side of the handset The FCN 0 5 function displays [MICAUDOF] and is pressed a serial character is sent to the radio. The handset disables the mic audio path during transmit. - Page 13 LBI-38953 will then return to looking for the busy tone, PTT or another function to be selected. Mic audio will not be present if NOTE transmitting. Any key causes the radio to reset to default condi- tions. NOTE Pressing any key causes the test to abort.
- Page 14 LBI-38953 Relay Switch (FCN 1 8) CAUTION The FCN 1 8 function displays [RELYTOGL] and is used to toggle the relay (ext. alarm) line at a 1000 Hz rate for The radio must be equipped with the Talk-Around board level testing.
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Page 15: Radio Alignment Procedure
LBI-38953 Figure 1- Location of Adjustment Controls • PC Programming Adapter - includes TQ3310 Tone Channel Guard Decode (FCN 2 6) 19D438367G1 Programming Inter- face Box w /LBI-31986, ca ble TQ3370 When the FCN 2 6 function is selected the radio displays... -
Page 16: Transmitter Alignment
LBI-38953 • Pin Extractor Tool (11-03-0038) - Al- 3. Select a talk-around channel 4249 (CLR 4249 CLR) at ST3712 lows removal of contacts from con- 859.000 MHz. Turn on the TX audio (FCN 0 4). Turn nector shell that mates with option on the Tone Channel Guard (FCN 2 5) which also keys cable CC01. -
Page 17: Transmitter Verification
LBI-38953 than -18 dB down from the 6.3 Vrms reference taken Quadrature Detector Adjustment above. Push END to unkey the transmitter. 1. Inject a strong on-channel signal at the antenna jack modulated with a 1 kHz tone at 3 kHz deviation. -
Page 18: Receiver Verification
LBI-38953 Figure 2 - Audio Output Test Set-up Diagram 2. Set the volume at 10. Monitor the external outputs at RECEIVER VERIFICATION J905-2,9. The output level should be approximately 6.3 Vrms with less than 5% distortion. SINAD Duplex Receive Sensitivity 1. -
Page 19: Audio Signal Flow Diagram
AUDIO SIGNAL FLOW DIAGRAM LBI-38953... -
Page 20: Control Signal Flow Diagram
LBI-38953 CONTROL SIGNAL FLOW DIAGRAM... -
Page 21: Power Distribution Diagram
POWER DISTRIBUTION DIAGRAM LBI-38953...