Ericsson 1341-B User manual

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
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