Panasonic KX-TCA256X, Service Manual

Page: 38 / 61

38
KX-TCA256X
( N ) Timing Confirmation - Follow steps 1 to 3 of (I) above.
4.Confirm that the Timing accuracy is < ± 0.5ppm.
IC601,
R631,C649,
IC201
( O )* RSSI Level Confirmation - Follow steps 1 to 3 of (I) above.
4.Set DECT tester power to -81dBm.
5.Execute the command "readrssi".
6.Confirm that the returned value is 0x11±8 (hex).
7.Set DECT tester power to -63dBm.
8.Execute the command "readrssi".
9.Confirm that the returned value is 0x1E±8 (hex).
IC601,
R610,C624,
R614
( P ) Power RAMP Confirma-
tion
- Follow steps 1 to 3 of (I) above.
4.Confirm that Power RAMP is matching.
IC602,
C651
( Q ) Audio Check and confir-
mation
- 1. Link to standard BASE which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 40mA.
3. Input -45dBm/1KHz to MIC and measure Line output level.
4. Confirm that the level is reference sample? 1.5dBm and confirm that the dis-
tortion level is < 5%.
5. Input -20dBm/1KHz to Line I/F and measure Receiving level at CN402-1 and
CN402-2.
6. Confirm that the level is reference sample±1.5dBm and confirm that the dis-
tortion level is < 5%.
IC201,
R407,C413,
C415,
CN404,
R418,C425,
CN404
( R ) SP phone Audio check
and confirmation
- 1. Link to standard Base which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 40mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -45dBm/1KHz to MIC and measure Line output level.
5. Confirm that the level is reference sample±1.5dBm and confirm that the dis-
tortion level is < 5%.
6. Input -20dBm/1KHz to Line I/F and measure Receiving level at CN401-1 and
CN401-2.
7. Confirm that the level is reference sample±1.5dBm and confirm that the dis-
tortion level is < 5%.
IC201,
R408,C410,
IC401,
R405,C430,
C405,C409,
C408,R406,
C407,C432,
IC301,
IC201,
R404,C404,
R403,C403
( S ) Headset Audio check
and confirmation
- 1. Link to standard BASE which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 40mA.
3. Input -45dBm/1kHz across Mic terminals on headset cable.
4. Confirm that the level is reference sample±1.5dBm and confirm that the dis-
tortion level is < 5%.
5. Input -20dBm/1kHz to Line I/F.
6. Confirm that the level is reference sample±1.5dBm and confirm that the dis-
tortion level is < 5%.
(SP terminals on headset cable is load of 150 ohm)
IC201,
R424,R423,
Q401,
CN404
( T )* EEP-ROM confirmation - 1. EEP-ROM Confirmation (Execute the command "chk255Xv0.1.bat")
2. confirm the returned check sum Value (check sum is 7F1C) IC201,
CN202,
R206,R207,
R202,R203,
R204
( U ) RSSI Calibration Confir-
mation
- 1. Set DECT Tester Power to -81dbm.
2. Run "ReadRSSI" and record the returned value.
3. Run "eeprom write" and write the returned value.
WrEeprom 00 50 1 XX
RdEeprom 00 50 1
4. Set DECT Tester Power to -63dbm.
5. Run "ReadRSSI" and record the returned value.
6. Run "eeprom write" and write the returned value.
WrEeprom 00 51 1 XX
RdEeprom 00 51 1
IC201,
CN202,
R206,R207,
R202,R203,
R204
Items Adjustment
Point
Procedure* Check or
Replace Parts