Ericsson 1341-B Manuale utente
SERVICE: Telephone
Ericsson Handheld Telephone 1341-B
SERVICE: Telephone
2
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
3
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
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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
5
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.
2
3
54
6
87
9
18
10
12
13
14
15
17
16
111
SERVICE: Telephone
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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
7
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
8
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
9
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
10
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