Panasonic KX-TG9385BXT Service Manual page 42

KX-TG9385BXT/KX-TGA939BXT
Items
(L) SP phone Audio Check
and Confirmation
(M) Charge Pump 2.5V Sup-
ply Confirmation
(N) Change Pump 4.0V
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 40 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -25 dBm/1KHz to Line I/F and measure Receiving level at SP+ and SP-
(at 8 Ω Load).
5. Confirm that the level is -9 dBm ± 4 dBm and that the distortion level is < 5%.
(vol = 3)
CP2.5V 1. Confirm that the voltage between testpoint and CP2.5V and GND is 2.5V -0.1/
+0.3V.
CP4.0V 1. Confirm that the voltage between testpoint CP4.0V and GND is 4.0V I0.2V.
Procedure
42
Check or
Replace Parts
IC1, R23, C12,
C73, D13,
D14, R152,
C80, L10, L11,
MIC, C11,
C13, RA4,
R27, R28,
R208, R209,
C96, C97,
R215, C72
C52, C53, C49
C50, C51