Panasonic KX-TG8421HGN Service Manual page 54

KX-TG8421HGN/KX-TGA840FXN
Items
(K)* Frequency Offset Confir-
mation
(L)* Frequency Drift Confir-
mation
(M)* Sensitivity Receiver
Confirmation
(N)* Power RAMP Confirma-
tion
(O) Audio Check and Confir-
mation
(P) SP phone Audio Check
and Confirmation
(Q) Charge Pump 2.5V Sup-
ply Confirmation
(R) Charge Pump 4.0V Sup-
ply Confirmation
Check
Point
- Follow steps 1 to 3 of (I).
4.Confirm that the frequency Offset is < ± 50 kHz.
- Follow steps 1 to 3 of (I).
4.Confirm that the frequency Drift is < ± 35 kHz/ms.
- Follow steps 1 to 3 of (I).
4.Set DECT tester power to -88 dBm.
5.Confirm that the BER is < 1000 ppm.
- Follow steps 1 to 3 of (I).
4.Confirm that Power RAMP is matching.
- 1. Link to BASE which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 40 mA.
3. Input -45 dBm/1KHz to MIC and measure Line output level.
4. Confirm that the level is -9.0 dBm ± 2 dBm and that the distortion level is < 5%
at TEL Line (600 Ω Load).
5. Input -20 dBm/1KHz to Line I/F and measure Receiving level at REV+ and
REV-.
6. Confirm that the level is -24.5 dBm ± 2 dBm and that the distortion level is < 5%
at Receiver. (vol = 2)
- 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-.
5. Confirm that the level is -9.5 dBm ± 2 dBm and that the distortion level is < 5%.
(vol = 3)
CP2.5V 1. Confirm that the voltage between testpoint 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
54
Check or
Replace Parts
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
IC1, C12, D19,
D20, C96,
C97, R215,
R27, RA4,
C11, C13,
R28, D3, D4,
MIC, L9, RA2,
R73, R74
IC1, C12, C73,
D13, D14,
R152, R73,
R74, RA2,
MIC, C11,
C13, RA4,
R27, R28,
R208, R209,
C96, C97,
R215, C72
C52, C53, C49
C50, C51