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Ericsson MDX series Service Manual
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Ericsson MDX series Service Manual

800 mhz
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Download this manual See also: Installation Manual
SERVICE SECTION
FOR
MDX SERIES, 800 MHz
TABLE OF CONTENTS
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INITIAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRANSMITTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MECHANICAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ANTENNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STATIC HANDLING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE BOTTOM COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE TOP COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE RF BOARD A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE FRONT CAP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE AUDIO AMPLIFIER BOARD A3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE AUDIO/LOGIC BOARD A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE SYSTEM BOARD A5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PA BOARD REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TO REMOVE THE DISPLAY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPONENT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SURFACE MOUNTED COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Remove Surface Mounted Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Replace Surface Mounted Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Replace Surface Mounted Integrated Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ERROR MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SYMPTOMS AND CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST MODE COMMANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key/Unkey Transmitter (XMIT CON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mute/Unmute Receiver Audio (AUDI CON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mute/Umute Mic Audio (PHON CON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generate Dotting (4800 CPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generate Pseudo Random HS Data (9600 PRD) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Encode Channel Guard Tone (150 CPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Report Receiver Carrier Sense (CAS TEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Across Band Switching (BAND SWT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generate Alert Tone (ALERT TN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External RAM Test (RAM TEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Version Number (UPR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checksum Test (PROG TS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LBI-38851A
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Summary of Contents for Ericsson MDX series

  • Page 1 LBI-38851A SERVICE SECTION MDX SERIES, 800 MHz TABLE OF CONTENTS Page DESCRIPTION ........... .
  • Page 2 A high resistance may ground straps can not be used, touch a grounded item cause excessive voltage drops and alternator noise problems. prior to handling an open radio. Copyright © December 1992, Ericsson GE Mobile Communications Inc.

  • Page 3: Disassembly Procedures

    LBI-38851 LBI-38851 Avoid touching any electrically conductive parts of cir- • TO REMOVE TOP COVER PA BOARD REMOVAL NOTE cuit modules with your hands. When you must handle 1. Remove the bottom cover and slide the top cover up out of l.

  • Page 4: To Remove Surface Mounted Components

    LBI-38851 LBI-38851 apply heat for an excessive length of time and do not use RF Board A2: Synthesizer: generates all transmit and Front Cap Control Panel. • • CAUTION excessive solder. receive frequencies. Assembly Display Board includes microprocessor Avoid applying heat to the body of any chip component With a hot-air system, apply hot air until all "tinned"...

  • Page 5: Test Preparation

    LBI-38851 LBI-38851 No RX Alert Check the signalling tone output from the Radio will not Verify radio is getting turned "on" by pro- External RAM Test (RAM TEST) TEST PREPARATION • Tone audio/logic board. Operate the volume program when grammer. •...

  • Page 6: Generate Pseudo Random Hs Data (9600 Prd)

    LBI-38851 LBI-38851 Select the "TONE SEL" command from the menu. Press Generate Pseudo Random HS Data (9600 PRD) External RAM Test (RAM TEST) 11 Hertz Test (11 HERTZ) the MNU button to display the tone set. Pressing the GROUP UP/DOWN button scrolls through the tone set selections. This command causes the radio to begin generating pseudo This test causes the radio to conduct a test of its 8K RAM This command generates an 11 Hz square wave on the low...

  • Page 7: Test Procedure

    Programming cable - interface to Dual For- • measured deviation on the two channels should be 3.5 kHz mat MDX Series radios ±0.2 kHz. 3. Key the transmitter on a channel near the center of the frequency band in the direct mode and adjust R226 for 4.25 •...

  • Page 8: Low Speed Data And Channel Guard Check

    LBI-38851 LBI-38851 ALIGNMENT PROCEDURE Low Speed Data and Channel Guard Check Squelch Adjust 1. Turn on the 11 Hz signal (low speed data). Verify TX 1. Select any channel. Apply a signal modulated with a 1 kHz To align the radio, test mode operation should be used as described in the Test Preparation section. Refer to the assembly diagrams modulation is 0.75 kHz ±0.25 kHz.

  • Page 9: Regulated Voltages

    LBI-38851 LBI-38851 SW A+ Front Cap Assembly (Display Board) APPENDIX A. GE-MARC TONES Switched A+ (13.6 volts nominal) originates from the A 5-volt regulator on the audio amplifier board powers the NUMBER FREQUENCY NUMBER FREQUENCY MOSFET switch on the system board. The Ignition Sense lead microprocessor logic display, icon LED’s.
  • Page 10 ASSEMBLY DIAGRAM LBI-38851 LBI-38851 19D904183, Sh. 1 Rev 1...
  • Page 11 ASSEMBLY DIAGRAM LBI-38851 LBI-38851 19D904183, Sh. 2, Rev. 2 Sh. 5, Rev. 3...
  • Page 12 LBI-38851 LBI-38851 Figure 4 - Power Distribution Diagram...
  • Page 13 LBI-38851 LBI-38851 Figure 5 - Audio Signal Flow Diagram...
  • Page 14 LBI-38851 LBI-38851 Figure 6 - Data Control Diagram...