Panasonic KX-TCD540NZM Service Manual page 105

Items Adjustment
(S) SP phone
Audio check
and
confirmation
(T) Headset Audio
check and
confirmation
Point
1. Link to 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 -6dBm ± 1.5dB and confirm that the distortion level is < 5%
at TEL Line (600
6. Input -20dBm/1KHz to Line I/F and measure Receiving level at SP1 and SP2.
7. Confirm that the level is -6.5dBm ± 1.5dB and confirm that the distortion level is < 5%
at Receiver (Volume Middle, 150
1. Link to 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 -14dBm ± 1.5dB and confirm that the distortion level is < 5%
at TEL Line (600
5. Input -20dBm/1kHz to Line I/F.
6. Confirm that the level is -25dBm ± 1.5dB and confirm that the distortion level is < 5%
at Receiver (Volume Middle, 150
(SP terminals on headset cable is load of 150
Procedure
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105
Check or
Replace
Parts
IC1, IC2,
C68,
C37, C90,
C91,
R25, R26,
C12,
C87, C10,
R29, C89,
C17, R37,
R38, R80,
C92,
C13, R35,
C15,
C16, D8,
C86,
C75, C77,
C38,
C80, R74,
R36
IC1, IC2,
CN4,
R50, R71,
R75,
C42, D4,
D5,
R29, R25