7.6. CHARGE CURRENT TESTS
7.5. TELEPHONE LINE TESTS
1. Switch on the 9V power supply.
2. Connect a telephone cord from the base unit to the line/DTMF test set.
3. Enter "HOOKOFF" from the PC to invoke an off-hook condition.
4. Set the current limit to 40mA on the line simulator.
5. Enter "HOOKON" from the PC to invoke the on-hook condition.
6. Check that the line current has dropped to 0 ± 0.5mA.
7. Enter "HOOKOFF".
8. Use a DMM to test the off-hook voltage at TP50. It must be 6.0V ± 1.0V.
9. Enter "LINEIMP 1" at the PC to switch on the pulse-dialing impedance.
10. Check the DC voltage at TP50. It must be < 3.5V.
11. Enter "LINEIMP 0" at the PC to switch off the pulse-dialing impedance.
12. Enter "DTMF_UP" to make the base generate the upper DTMF frequency.
13. Check that the upper frequency is detected by the line/DTMF test set. Must be 1477Hz ± 1.5%.
14. Enter "DTMF_LO" to make the base generate the lower DTMF frequency.
15. Check that the lower frequency is detected by the line/DTMF test set. Must be 852Hz ± 1.5%.
16. Switch off the 9V power supply.
17. Disconnect the telephone line and reconnect the base to the Bell oscillator.
18. Switch on the 9V supply.
19. Enter "RINGDET" to check the ring detection status. The command returns a number to the PC display. "0" = no ring.
20. Switch the bell oscillator on to 23Hz, 30V RMS.
21. Send the batch file "RINGDET".
22. Check that the Number on the PC display has changed to "1".
23. Switch off the 9V power supply.
1. Switch on the 9V power supply.
2. Connect an ammeter directly across the charge terminals (effectively short circuiting them).
3. Measure 270mA ± 15% through the meter.
4. Switch off the 9V power supply.
33
KX-TCD705RUM / KX-TCD705RUS
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