Panasonic KX-TCD755RUS Service Manual ▷ View online
10.4. Loopback Tests
1. All RF measurements must be made with TP73 and TP74 shorted together.
2. Connect the RF input cable from the CMD60 to 0V and TP68.
3. Switch on the 2.4V supply.
4. Switch the handset on at the keypad.
5. Enter "RDEEPROM 00 4A 01". This will return the value "25" if a base has been registered to the handset, or "FF" if there is
2. Connect the RF input cable from the CMD60 to 0V and TP68.
3. Switch on the 2.4V supply.
4. Switch the handset on at the keypad.
5. Enter "RDEEPROM 00 4A 01". This will return the value "25" if a base has been registered to the handset, or "FF" if there is
no base registered..
6. If a base is not registered to the unit (i.e. "FF" returned in step 5) then enter "SETBASE" to induce registration.
7. Set the CMD60 to MANUAL TEST mode.
8. Enter "TESTMODE" on the PC.
9. Enter "RDEEPROM 00 36 05" to obtain the base RFPI identifier.
10. Set the RFPI in the CMD60 to the value obtained in the previous step.
11. Press SETUP CONNECT on the CMD60.
12. Check the power (NTP): it must be 24 ± 1dBm.
13. Press MODULATION.
14. Set DATA TYPE to FIG 31.
15. Check frequency drift: must be 0 ± 35dBm.
16. Check frequency offset: must be 0 ± 40 kHz..
17. Check deviation or modulation (max ± Bfield) with data type "FIG 31": must be 360KHz 30kHz
18. Press Menu Up "
7. Set the CMD60 to MANUAL TEST mode.
8. Enter "TESTMODE" on the PC.
9. Enter "RDEEPROM 00 36 05" to obtain the base RFPI identifier.
10. Set the RFPI in the CMD60 to the value obtained in the previous step.
11. Press SETUP CONNECT on the CMD60.
12. Check the power (NTP): it must be 24 ± 1dBm.
13. Press MODULATION.
14. Set DATA TYPE to FIG 31.
15. Check frequency drift: must be 0 ± 35dBm.
16. Check frequency offset: must be 0 ± 40 kHz..
17. Check deviation or modulation (max ± Bfield) with data type "FIG 31": must be 360KHz 30kHz
18. Press Menu Up "
↑
" on the CMD60.
19. Press POWER RAMP.
20. Check that the burst fits the mask.
21. Press Menu Up "
20. Check that the burst fits the mask.
21. Press Menu Up "
↑
" on the CMD60.
22. Press BER.
23. Obtain the sensitivity by slowly reducing RF LEVEL until the BER falls below 1000ppm. The sensitivity is the RF LEVEL reading
23. Obtain the sensitivity by slowly reducing RF LEVEL until the BER falls below 1000ppm. The sensitivity is the RF LEVEL reading
at this point. It must be < -90dBm.
24. Press Menu Up "
↑
" on the CMD60.
25. Press BEARER RELEASE and switch off the 2.4V supply.
Note:
Note:
These tests can also be repeated on TRAFFIC CARRIERS 0 and 9.
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KX-TCD755RUS
11 TROUBLESHOOTING GUIDE
11.1. Handset: Does Not Operate
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KX-TCD755RUS
11.2. Handset: Link
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KX-TCD755RUS
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KX-TCD755RUS
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