Panasonic KX-TCD715EM, Service Manual

Page: 37 / 106

4. Check the 3.8V supply rail at TP11. It must be 3.8V ± 0.2V.
5. Check the 2.65V supply rail at the collector of transistor T6. It
must be 2.65V ± 0.2V.
6. Switch off the 2.4V supply.
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.
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.
37