Panasonic KX-TCD725GM Service Manual ▷ View online
9.3.
SET CLOCK FREQUENCY
1. Turn on the 2.4V supply.
2. Switch the handset on at the keypad.
3. Enter "DEACTMAC" from the PC to switch off the RF unit.
4. Enter "CONTTX 0" to start continuous RF transmission.
5. Check that the current consumption is approx. 220mA.
6. Enter "RDEEPROM 00 00 02" to display the two-byte frequency adjustment value, MSB first.
7. Connect the frequency counter probe to TP24 to measure the SYRI signal from the BBIC.
8. The clock frequency should be within 10,368,000Hz ± 10Hz. If not then enter "SETFREQ nn nn" where nn nn are the clock
frequency adjustment values. An increase in the value will lower the clock frequency and vice versa. The maximum value is 01
FF.
FF.
9. Switch off the 2.4V supply.
9.4.
LOOPBACK TESTS
1. Connect the RF input cable from the CMD60 to the "0V" and "ANT" antenna pads.
2. Switch on the 2.4V supply.
3. Switch the handset on at the keypad.
4. 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.
5. If a base is not registered to the unit (i.e. "FF" returned in step 4) then enter "SETBASE" to induce registration.
6. Set the CMD60 to MANUAL TEST mode.
7. Enter "TESTMODE" on the PC.
8. Enter "RDEEPROM 00 36 05" to obtain the base RFPI identifier.
9. Set the RFPI in the CMD60 to the value obtained in the previous step.
10. Press SETUP CONNECT on the CMD60.
11. Check the power (NTP): it must be between 20 and 25dBm.
12. Press MODULATION.
13. Set DATA TYPE to FIG 31.
14. Check frequency drift: must be 0 ± 35 kHz/ms.
15. Check frequency offset: must be 0 ± 40 kHz.
16. Check deviation or modulation (max ± B field) with data type "FIG 31": must be 320kHz to 400kHz.
17. Press Menu Up "
↑" on the CMD60.
18. Press POWER RAMP.
19. Check that the burst fits the mask.
20. Press Menu Up "
↑" on the CMD60.
21. Press BER.
22. 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 < -88dBm.
23. Press Menu Up "
↑" on the CMD60.
24. Press BEARER RELEASE and switch off the 2.4V supply.
25. If the "SETBASE" operation above was carried out then enter "RESBASE" to de-register.
26. Disconnect the RF cable.
Note:
Step 2 to 24 can be repeated for TRAFFIC CARRIERS 0 and 9.
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KX-TCD725GM
10 TROUBLESHOOTING GUIDE
10.1. HANDSET: DOES NOT OPERATE
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KX-TCD725GM
10.2. HANDSET: LINK
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KX-TCD725GM
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KX-TCD725GM
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