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Service Instructions Ericsson Mobile Phone EF738 Service Instructions 2 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 Item 5: Nominal Deviation _____________________________________ 15 Item 6: SAT Deviation ________________________________________ 16 Item 7: TX Data Deviation _____________________________________ 17 Item 8: AFMS and Harmonic Distortion __________________________ 18 Item 9: Receiver Sensitivity ____________________________________ 19 3 Service Instructions 4 Service Instructions System Connector Signals External units are connected to the Transceiver Board via the 12-pin System Con- nector. 1 2 3 11 12 Pin Signal In/Out Function 1 AFMS Out Audio From Mobile Station 2 ATMS In Audio To Mobile Station 3 EXTAUD In External Analog Audio Accessory Sense 4 AGND Audio Signal Ground, 0V reference 5 PORTHF In Portable Handsfree 6 MUTE Out Music Mute 7 VPPFLASH In Flash Memory Voltage and Service Voltage 8 VDD Out Logic Reference, Status ON 9 DFMS Out Data From Mobile Station 10 GND Digital Ground and DC Return 11 DTMS In Data To Mobile Station 12 DCIO In/Out DC positive pole for phone battery charging and external accessory powering 5 Service Instructions Disassembly 1. Remove the battery and the antenna Before opening the unit for further disassembly, make sure that the parts can be