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Ericsson MDX SERIES, Service Manual, Page: 13 / 14

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Ericsson MDX SERIES Service Manual Download Page 13

Figure 5 - Audio Signal Flow Diagram

LBI-38851

LBI-38851

12

Summary of Contents for MDX SERIES

Page 1: ...EM BOARD A5 2 PA BOARD REMOVAL 2 TO REMOVE THE DISPLAY BOARD 2 COMPONENT REPLACEMENT 2 SURFACE MOUNTED COMPONENTS 2 To Remove Surface Mounted Components 3 To Replace Surface Mounted Components 3 To Re...

Page 2: ...nothing is working loose ANTENNA The antenna antenna base and all contacts should be kept clean and free from dirt or corrosion If the antenna or its base should become coated or poorly grounded loss...

Page 3: ...cap assembly and the audio board from the radio Refer to the disassembly procedures for each 2 Remove interconnect plug P702 from the RF and audio logic board on the bottom of the radio 3 Remove the f...

Page 4: ...are located at the back of this manual Refer to the appropriate LBI on the suspect board for additional circuit information The Dual Format MDX 800 MHz mobile radio is divided into 6 boards for assem...

Page 5: ...User Testmode that is employed by the Dual Format MDX radio It is recommended that the users test frequency set include at least 4 conventional channels with one of the channels being a talk around ch...

Page 6: ...are wave on the low speed data Channel Guard output To modulate the transmit ter with this data the transmitter must have been keyed using the key transmitter command Select the 11HERTZ test from the...

Page 7: ...cal Eye Pattern is shown in Figure 2 TEST EQUIPMENT AND SERVICE AIDS The following list of test equipment and service aids are available to facilitate servicing TQ3370 PC Programming Adapter includes...

Page 8: ...nna jack 2 Press and hold the SCAN button on the radio and use the Volume Up Down to open close the squelch 3 While monitoring SPKR HI J725 3 adjust the signal gen erator for 8 dB SINAD 4 While holdin...

Page 9: ...wer the audio circuits Front Cap Assembly Display Board A5 volt regulator on the audio amplifier board powers the microprocessor logic display icon LED s Audio Amplifier Board A 5 volt regulator U727...

Page 10: ...ASSEMBLY DIAGRAM 19D904183 Sh 1 Rev 1 LBI 38851 LBI 38851 9...

Page 11: ...ASSEMBLY DIAGRAM 19D904183 Sh 2 Rev 2 Sh 5 Rev 3 LBI 38851 LBI 38851 10...

Page 12: ...Figure 4 Power Distribution Diagram LBI 38851 LBI 38851 11...

Page 13: ...Figure 5 Audio Signal Flow Diagram LBI 38851 LBI 38851 12...

Page 14: ...Figure 6 Data Control Diagram LBI 38851 LBI 38851 13...

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