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Table of Contents
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Summary of Contents for Ericsson EF738
- Page 1 Service Instructions Ericsson Mobile Phone EF738...
- Page 2 Service Instructions...
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Page 3: Table Of Contents
Service Instructions Contents System Connector Signals ____________________________ 5 Disassembly________________________________________ 6 Reassembly ________________________________________ 7 Flip Mount Inspection______________________________________ 8 Warranty Seal ____________________________________________ 8 Exchanging the Circuit Board_________________________ 9 Fault Finding and Alignment ________________________ 10 Sequence of Adjustments __________________________________ 11 Item 1: VCTCXO ____________________________________________ 11 Item 2: RSSI Calibration ______________________________________ 12 Item 3: RF Output Power ______________________________________ 13 Item 4: Maximum Deviation ___________________________________ 14... - Page 4 Service Instructions...
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Page 5: System Connector Signals
Service Instructions System Connector Signals External units are connected to the Transceiver Board via the 12-pin System Con- nector. Signal In/Out Function AFMS Audio From Mobile Station ATMS Audio To Mobile Station EXTAUD External Analog Audio Accessory Sense AGND Audio Signal Ground, 0V reference PORTHF Portable Handsfree MUTE... -
Page 6: Disassembly
Service Instructions Disassembly 1. Remove the battery and the antenna Before opening the unit for further disassembly, make sure that the parts can be placed on a dust-free ESD-protected surface. NOTE! Do not touch the display with your fingers! 2. Place the phone on its front and remove four screws with the appropriate torx screwdrivers. -
Page 7: Reassembly
Service Instructions Reassembly 1. Place a front cover (2) on the workbench Assemble the keypad (4). 2. Carefully place the board (1) into the front cover with the shield can upwards. NOTE! Do not touch the display with your fingers 3. -
Page 8: Flip Mount Inspection
Service Instructions Flip Mount Inspection After mounting the flip; Hold the telephone upside down and check that the flip is not open. The flip must be closed as shown in fig. 1; not open as shown in fig. 2. Fig. 1: Flip Closed Fig. -
Page 9: Exchanging The Circuit Board
Service Instructions Exchanging the Circuit Board 1. Transfer the EEPROM contents of the phone to the PC as described in section 3, Test/Service Programs. 2. Disassemble as previously described in this section. 3. Exchange the board. 4. Reload the EEPROM customer data into the phone. 5. -
Page 10: Fault Finding And Alignment
Service Instructions Fault Finding and Alignment The table below shows information about test points and test data of the radio and logic/audio parts of the board. This information will become an aid in testing as well as fault finding. In general, the following procedure can be used: 1. -
Page 11: Sequence Of Adjustments
Service Instructions Sequence of Adjustments Item 1: VCTCXO Purpose: Checking and, if necessary, calibrating the reference frequency generator for the synthesizers Test method: Radio test set in TX mode, measured with a frequency counter Input signal: None Measurement point: Transmitter frequency at antenna connector Limit: 890.0125MHz ±200Hz Procedure:... -
Page 12: Item 2: Rssi Calibration
Service Instructions Item 2: RSSI Calibration Purpose: Calibration of the RSSI (received signal strength indicator) Test method: Radio test set in RX mode Input signal: Apply 935.0125MHz RF signal modulated with a 1kHz tone at 5.7kHz deviation at a level of -115dBm to the antenna connector Measurement point: None Limit:... -
Page 13: Item 3: Rf Output Power
Service Instructions Item 3: RF Output Power Purpose: Checking and, if necessary, calibrating the RF output power Test method: Radio test set in TX mode Input signal: None Measurement point: Output power at the antenna connector measured with an RF power meter Limit: Power level Output power... -
Page 14: Item 4: Maximum Deviation
Service Instructions Item 4: Maximum Deviation Purpose: Checking and, if necessary, calibrating the maximum deviation of the transmitter Test method: Radio test set in TX mode Input signal: 1kHz sine wave signal at 320mV to ATMS (system connector) Measurement point: At the antenna connector measured with a deviation meter Tolerance: ±7.2kHz -1dB (6.462 - 7.200 kHz) -
Page 15: Item 5: Nominal Deviation
Service Instructions Item 5: Nominal Deviation Purpose: Checking and, if necessary, calibrating the nominal deviation of the transmitter Test method: Radio test set in TX mode Input signal: 1kHz sine wave signal at 190mV to ATMS (system connector) Measurement point: At the antenna connector measured with a deviation meter Limit: ±5.7kHz ±0.5dB (5.38 - 6.02 kHz) -
Page 16: Item 6: Sat Deviation
Service Instructions Item 6: SAT Deviation Purpose: Checking and, if necessary, calibrating the SAT (Supervisor Audio Tone) deviation of the transmitter Test method: Radio test set in TX mode Input signal: None Measurement point: At the antenna connector measured with a deviation meter Limit: ±1.7kHz ±0.5dB (1.60 - 1.80 kHz) Procedure:... -
Page 17: Item 7: Tx Data Deviation
Service Instructions Item 7: TX Data Deviation Purpose: Checking and, if necessary, calibrating the TX data deviation of the transmitter Test method: Radio test set in TX mode Input signal: None Measurement point: At the antenna connector measured with a deviation meter Limit: ±6.4kHz ±0.5dB (6.021 - 6.780 kHz) Procedure:... -
Page 18: Item 8: Afms And Harmonic Distortion
Service Instructions Item 8: AFMS and Harmonic Distortion Purpose: Checking and, if necessary, calibrating the deviation of the receiver Test method: Radio test set in RX mode Input signal: Apply a -50dBm 935.0125MHz RF signal modulated with a 1kHz tone, ±2.3kHz deviation to the antenna input Measurement point: At the AFMS output from the system connector measured with an AC volt meter... -
Page 19: Item 9: Receiver Sensitivity
Service Instructions Item 9: Receiver Sensitivity Purpose: Checking the receiver sensitivity Test method: Radio test set in RX mode Input signal: Apply an RF signal at low, mid, and high channel modulated with a 1kHz tone at 5.7kHz deviation at a level of -113dBm to the antenna input Measurement point: At the AFMS output from the system connector measured with an AC volt meter Limit:... - Page 20 Service Instructions...