Ericsson 1341-B Manuel utilisateur

SERVICE: Telephone

Ericsson Handheld Telephone 1341-B

SERVICE: Telephone

Contents

Connectors and Signals ______________________________4

Connector J1 ____________________________________________4

Disassembly __________________________________________6

Reassembly______________________________________________7

Changing the Circuit Board _________________________________7

Fault Finding and Alignment__________________________8

Sequence of Adjustments ____________________________9

SERVICE: Telephone

Connectors and Signals

The location of the logic board connectors and a description of the respective

signal names will follow below.

Connector J1

Table 1: Connector J1

Pin Signal In/Out Function

1ATMS In Audio To Mobile Station

Sensitivity: 50 mV,

referred to +/-2.3 kHz dev.

Input imp. 10 kΩ/nF

2PWRSRC In Power source

Indicates external power supply

Log. "1": External power supply

Log. "0": Battery

3LSPCTRL Out Loudspeaker control

Handsfree loudspeaker control

Log. "1": Speaker ON

Log. "0": Speaker OFF

4AGND Analog ground

Signal ground 0 V

Return lead for pins 5 and 1

SM1341EN/CONJ1.GEM

1 ATMS

2 PWSRC

3 LSPCTRL

4 AGND

5 AFMS

6 SWDC5

7 ICTRL

8 DGND

9 VPPFLASH

10 HOOK

11 DTMS

12 DFMS

13 ONSRQ

14 DCIN

SERVICE: Telephone

Pin Signal In/Out Function

5AFMS Out Audio From Mobile Station

Output 307 mV, referred to 5.7 kHz dev.

(varies with volume)

Output imp. < 1 kΩ

6SWDC5 Out Logic control signal (4.8 V) for external

units.

Max. current 10 mA

7ICTRL Out Control of external supply current.

Log. "1": Supply 700 mA

Log. "0": Supply 30 mA

8DGND Digital ground

9VPPFLASH In Disconnects internal watchdog during

test and supplies programming voltage to

flash memory

Open: normal mode

5 V: test mode

12V: programming voltage

10 HOOK In External Handsfree present

Log. "1": External HF present

Log. "0": No external Handsfree

11 DTMS In Data To Mobile Station

Asynchronous serial transfer:

8 bits, 600 bits/s

Input impedance 100 kΩ/ nF

Log. "1": 4.8 V

Log. "0": 0.5 V

12 DFMS Out Data From Mobile Station

Asynchronous serial transfer:

8 bits, 600 bits/s

Log. "1": 4.8 V

Log. "0": 0.5 V

13 ONSRQ In ON and Service Request signal

If momentarily connected to GND causes

telephone to shift between ON and OFF

state

14 DCIN In Supply to telephone

Min. 5.3 V; max. 8.5 V

Nominal 6.8 V, max. 1 A

SERVICE: Telephone

Disassembly

A complete disassembly of the telephone is described below.

1. Remove the battery and the antenna.

Before opening the unit for further disassembly, be sure the parts can be

placed on a dust-free and grounded surface. It is also important that you avoid

touching any contact points and the display with your fingers.

2. Place the telephone on its front and remove four screws (4 and 6) with the

appropriate torque screwdriver.

3. Place the telephone on its back and remove the front cover (1), lifting it

upwards.

4. Remove the keypad (15).

5. Taking care not to bend the contact pins, remove the earpiece by lifting it

upwards.

6. Move the two clips (9) at the sides of the frame outwards from the board.

7. Carefully lift the board at the edges of the lower part upwards approximately

1 cm. Free the upper part of the board from the upper clip, twisting the board

without moving it upwards. Carefully lift the board upwards from the frame,

after it has got clear of the upper clip.

111

SERVICE: Telephone

Reassembly

1. Carefully place the upper part of the board in the frame and make sure that

the upper clip is correctly mounted against the board.

2. The two side clips shall be positioned outwards from the board. Make sure

that the clips are correctly mounted on the other side of the frame.

3. Carefully place the lower part of the board in the frame, free of the side

clips. Once mounted correctly, move the side clips inwards over the board.

4. Place the earpiece in its position.

5. Place the keypad on the light conductor.

6. Carefully replace the front cover.

7. Place the telephone on its front.

8. Tighten the screws diagonally as shown in torquing sequence below.

It is of utmost importance that the screws are tightened to 0.20 Nm with a

dynamometric screwdriver.

Changing the Circuit Board

1. Transfer the EEPROM contents to the personal computer as described in

Service Equipment, page C-8.

2. Transfer ESN and PIN to a new circuit board as described in Appendix E;

ESN Transfer,

3. Disassemble as described in Disassembly on previous page.

SERVICE: Telephone

4. Change the board.

5. Reload EEPROM customer data into the telephone.

6. Check the function of the telephone and, if necessary, align as described in

Fault Finding and Alignment on next page.

Fault Finding and Alignment

The tables below will inform you about test points and test data pertaining to

the radio and logic/audio boards. This information will aid you in testing but

also in fault finding. In general, the following procedure can be used:

1. Align the boards in the sequence stated below.

2. If you find that a specified value cannot be obtained, use the tools mentioned

in point 3 below to trace the reason.

3. The built-in Test Program will give you access to the function or signal you

want to investigate, and any signal data you may need is found in the section

Connectors and Signals. There you will also find illustrations showing the

distribution of signals on the respective connector pins.

The telephone is to be tested with the following settings if nothing else is ex-

plicitly stated:

DC power supplied either via battery connector 6.8 V, or system connector

6.8 V.

Channel 1 RX = 935.0125 MHz, TX = 890.0125 MHz

TX power Test program, option 2:8

AFC ON Test program, option 15:1

Audio switches ON Test program, option 20:3

MANCHESTER switch OFF Test program, option 23:0

SAT tone OFF Test program, option 22:3, 22:5

Handset switch OFF Test program, option 21:0.

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

Channel selection: Enter channel number followed by #

Tx Power on: If Power Reduction(test #76) is activated,

PL2 and PL3 are indicated on the LCD by a #.

For detailed information regarding the adjustments, refer to Appendix B; Test

Program.

SERVICE: Telephone

Sequence of Adjustments

Item 1 VCTCXO

Purpose: Checking and, if necessary, calibration of the reference frequency

generator for the synthesizers.

Input signal: -50 dBm RF signal of 935.0125 MHz at the antenna connector.

Test method: Radio test set in duplex mode, measured with a frequency

counter.

Test program settings: 1:1 Channel selection

2:2 TX ON at Power Level 2

15:0 AFC OFF

Measurement point: Transmitter frequency at antenna connector.

Value: 890.0125 MHz.

Tolerance: 2.2 kHz.

Procedure: If the transmitter frequency is not within 890.0103 - 890.0147

MHz use test option 18 and press M& 0to calibrate the VCTCXO automat-

ically. When the calibration is done the new stored value will be displayed.

Note: Prior to an automatic calibration, test #15 must be set to its default value

(1 = normal operation).

Alternatively, the calibration can be done manually with the same test option.

To enable calibration and echo initial value, press M& #. Use the ▲and ▼

buttons to change value and press M& S to store the new value.

SERVICE: Telephone

Item 2 RSSI and Frequency Compensation

Purpose: Calibration of the RSSI (level detector) and the maximum allowed

frequency compensation.

Input signal: Initially -115 dBm RF signal of 935.0125 MHz at the antenna

connector.

Test method: Radio test set in RX mode.

Test program settings: 1:1 Channel selection

15:1 AFC ON.

Measurement point: None.

Value: None

Tolerance: None.

Procedure: Enter test option 9 and press M& S, and the stored reference

value for the RSSI indication will be displayed. If an alarm signal is heard the

error of the received frequency is greater than 1 kHz and further calibration

cannot be done.

Increase the signal strength to -60 dBm and press M& S. Change the RF-in

signal to 935.0175 MHz (+5 kHz), wait 5 seconds, then press M& Sand the

stored max. allowed frequency compensation value will be displayed.

SERVICE: Telephone

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