Panasonic KX-TGCA20EX Service Manual page 44

KX-TGC210/KX-TGC212/KX-TGC213/KX-TGC220/KX-TGC222/KX-TGCA20
Items
(N) Audio Check and
Confirmation
(O) SP phone Audio Check
and Confirmation
(P) Charge Pump 3.0 V
Supply Confirmation
(Q) Charge Pump CP4V
Supply Confirmation
Check
Point
- 1. Link to BASE which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm (600 )/1 kHz to MIC of Handset. Measure the Level at Line I/F
and distortion level.
4. Confirm that the level is -1.5 ± 5 dBm (for BL,TU,BX,UE) or -0.4 ± 5dBm (for
CX) or -4.0 ± 5dBm (for HK,TW) or -3.5 ± 5dBm (for ML) and that the distortion
level is < 5 %
5. Input -20 dBm (600 )/1 kHz to Line I/F. Measure the Level at Receiver of
Handset and distortion level (Receive volume set to second position from
minimum).
6. Confirm that the level is 13.0 ± 4 dBm (for BL,TU,BX,UE) or -25.0 ± 4 dBm (for
CX) or -22.0 ± 4 dBm (for HK,TW,ML) and that the distortion level is < 5 % at
Receiver (34  Load).
- 1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -30 dBm (600 )/1 KHz to Line I/F and measure Receiving level at SP+
and SP-.
5. Confirm that the level is -10.0 dBm ± 3 dB and that the distortion level is < 5 %.
(vol = Max at SP (8  Load))
CP3V 1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0 V ± 0.3 V. C30, C53, C29
CP4V 1. Confirm that the voltage between testpoint CP4V and GND is 4.0 V ± 0.3 V.
(Power is supplied when LED in on)
Procedure
at TEL Line (600  Load).
44
Check or
Replace Parts
IC1, C12, C11,
C13, MIC,
R23, R24,
R25, RA4,
C70, C71
IC1, C78, C79,
R76, R77
C52, C55,
C30, C29