Download
Share
Print this page
  1. Manuals
  2. Brands
  3. Ericsson Manuals
  4. Cordless Telephone
  5. 1341-B
  6. Service manual

Ericsson 1341-B Service Manual

Handheld
Hide thumbs

Advertisement

Quick Links

Download this manual
SERVICE: Telephone
Ericsson Handheld Telephone 1341-B

Advertisement

loading

Related Manuals for Ericsson 1341-B

Summary of Contents for Ericsson 1341-B

  • Page 1 SERVICE: Telephone Ericsson Handheld Telephone 1341-B...
  • Page 2 SERVICE: Telephone...

  • Page 3: Table Of Contents

    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...

  • Page 4: Connectors And Signals

    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 ATMS PWSRC LSPCTRL AGND AFMS SWDC5 ICTRL DGND VPPFLASH HOOK DTMS DFMS ONSRQ DCIN SM1341EN/CONJ1.GEM Table 1: Connector J1 Signal In/Out...
  • Page 5 SERVICE: Telephone Signal In/Out Function AFMS Audio From Mobile Station Output 307 mV, referred to 5.7 kHz dev. (varies with volume) Output imp. < 1 kΩ SWDC5 Logic control signal (4.8 V) for external units. Max. current 10 mA ICTRL Control of external supply current.

  • Page 6: Disassembly

    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.

  • Page 7: Reassembly

    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.

  • Page 8: Fault Finding And Alignment

    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.

  • Page 9: Sequence Of Adjustments

    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.
  • Page 10 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.
  • Page 11 SERVICE: Telephone Item 3 RF Output Power Purpose: Check and, if necessary, adjustment of the RF output power levels. Input signal: None. Test method: Radio test set in TX mode, measured with a RF power meter. Test program settings: Channel selection 2:2-7 TX Power Level 2 down to 7.
  • Page 12 SERVICE: Telephone Item 4 Maximum Deviation. Purpose: Check and, if necessary, adjustment of the maximum deviation from the transmitter. Input signal: 1 kHz tone with a level of 700 mV at the ATMS input on the service adapter. Test method: Radio test set in TX mode, measured with a deviation meter. Test program settings: 1:1 Channel selection 2:2 TX On at Power Level 2...
  • Page 13 SERVICE: Telephone Item 6 SAT Deviation. Purpose: Check and, if necessary, adjustment of the deviation of the SAT (su- pervisor audio tone) from the transmitter. Input signal: None. Test method: Radio test set in TX mode, measured with a deviation meter. Test program settings: 1:1 Channel selection 2:2 TX On at Power Level 2...
  • Page 14 SERVICE: Telephone Item 7 Wideband Data Deviation Purpose: Check and, if necessary, adjustment of the deviation of the wide- band data and ST (signalling tone) from the transmitter. Input signal: None. Test method: Radio test set in TX mode, measured with a deviation meter. Test program settings: 1:1 Channel selection 2:2 TX On at Power Level 2...
  • Page 15 SERVICE: Telephone Item 8 Audio From Mobile Station (AFMS) Purpose: Check and, if necessary, adjustment of the deviation of the wide- band data and ST (signalling tone) from the transmitter. Input signal: -50 dBm RF signal of 935.0125 MHz at the antenna connector with 1 kHz tone and 5.7 kHz deviation.
  • Page 16 SERVICE: Telephone...