Loopback Tests - Panasonic KX-TCD725RUM Service Manual

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8.4 LOOPBACK TESTS

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1. Connect the RF Cable from the CMD60 to the RF2 line (IC4 pin44) and Ground plane of the
base P.C.B. Use the minimum amount of stripped/exposed cable to solder to the contacts.
2. Switch on the 9V supply.
3. Set the CMD60 to MANUAL TEST mode.
4. Set the CMD60 TRAFFIC CARRIER to 0.
5. Invoke the "TESTMODE" batch file from the PC.
6. Press ACCEPT RFPI and SETUP CONNECT on the CMD60.
7. If connection is successful the CMD60 will display "CONNECTION ESTABLISHED".
8. Enter "ANT2" to direct the RF output to the "RF2" terminal.
9. Check the power (NTP): it must be between 20 and 25dBm.
10. Press MODULATION.
11. Set DATA TYPE to FIG 31.
12. Check frequency drift: must be 0 ± 35 kHz/ms.
13. Check frequency offset: must be 0 ± 40 kHz.
14. Check deviation or modulation (max ± B field) with data type "FIG 31": must be 320kHz to
400kHz.
15. Press Menu Up "↑" on the CMD60.
16. Press POWER RAMP.
17. Check that the burst fits the mask.
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