Ericsson EF738 Betriebsanleitung

Service Instructions

Ericsson Mobile Phone EF738

Service Instructions

Contents

System Connector Si

nals ____________________________ 5

Disassembly________________________________________ 6

Reassembly ________________________________________ 7

Flip Mount Inspection______________________________________ 8

Warranty Seal ____________________________________________ 8

Exchan

the Circuit Board_________________________ 9

Fault Findin

and Ali

nment ________________________ 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

Service Instructions

stem Connector Si

nals

External units are connected to the Transceiver Board via the 12-pin System Con-

nector.

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

12 3 11 12

Service Instructions

Disassembl

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.

3. Remove the back cover carefully from underneath.

4. Loosen the remaining screws (6, 10).

Be careful not to damage the antenna connector (7).

5. Carefully remove the board (1) from the front cover (2) by lifting it upwards.

6. Remove the keypad (4).

Service Instructions

Reassembl

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. Drop a screw (10) into the upper right corner hole in the board.

Tighten the screw with a screwdriver (0.15Nm).

4. Drop an antenna connector (7) into the placement cavity of the antenna connec-

tor placement guide.

Ensure that the locating posts of the antenna connector are positioned in the mat-

ing holes of the board.

5. Drop a screw (6) into the screw hole in the antenna connector.

Tighten the screw with a scredriver (0.15Nm).

6. Mount the back cover (13) on the front cover (12).

Hold down the lower part of the back cover against the front cover and press the

upper part of the phone together.

7. Drop the four screws (14) into the holes on the back cover.

Tighten the screws with a screwdriver (0.15Nm).

8. Mount the antenna by screwing it clockwise into the thread.

9. Insert the battery pack into the phone and push until a click is heard.

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.

Warranty Seal

Place the warranty seal over the right hand torx screw at the bottom.

Fig. 1: Flip Closed

Fig. 2: Flip Open

Service Instructions

Exchan

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. Check the function of the phone and, if necessary, align as described next in

Fault Finding and Alignment.

Service Instructions

Fault Findin

and Ali

nment

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. Align the boards in the sequence stated below.

2. If a specific value cannot be obtained, use the tools mentioned in step 3 below to

trace the reason.

3. The built-in Test Program will provide access to the function or signal to become

investigated, and any signal data that may be required is found in the section

Connectors and Signals, where the distribution of signals at the respective con-

nector pins is found.

The telephone is tested, unless otherwise explicitly stated, with DC-power 6.2V

supplied via a dummy battery.

TP = Test Program

The above settings are automatically executed when entering the test program.

For detailed information regarding the adjustments, refer to subsection Test Pro-

gram in this section.

Channel 1 TP-1:1 (RX = 935.0125MHz, TX = 890.0125MHz)

RF Power Off TP-2:8

AFC Active TP-15:2

Audio Switches On TP-20:3 (TX & RX audio paths unmuted)

SAT Tone Off TP-22:3

Manchester Out Off TP-23:0

Volume 4 TP-25:4 (mid range)

TX Source ATMS TP-27:0

Earpiece External TP-28:2

Compandor Disabled TP-29:0 (disabled)

Softlimiter Off TP-32:0

Green LED Off TP-41:MENU+4:0

Red LED Off TP-41:MENU+5:0

ICTRL Off TP-41:MENU+2:0

Illumination Off TP-41:MENU+6:0

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