Panasonic KX-TGA840FXN, Service Manual

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54
KX-TG8421HGN/KX-TGA840FXN
( K )* Frequency Offset Confir-
mation
- Follow steps 1 to 3 of (I) .
4.Confirm that the frequency Offset is < ± 50 kHz.
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
( L )* Frequency Drift Confir-
mation
- Follow steps 1 to 3 of (I) .
4.Confirm that the frequency Drift is < ± 35 kHz/ms.
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
( M )* Sensitivity Receiver
Confirmation
- Follow steps 1 to 3 of (I) .
4.Set DECT tester power to -88 dBm.
5.Confirm that the BER is < 1000 ppm.
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
( N )* Power RAMP Confirma-
tion
- Follow steps 1 to 3 of (I) .
4.Confirm that Power RAMP is matching.
IC1,
C802~C806,
C808~C814,
C819~C820,
C822,
C825~C827,
C834,
C859~C864,
L801~L804,
DA801,
R801~R808
( O ) Audio Check and Confir-
mation
- 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)
IC1, C12, D19,
D20, C96,
C97, R215,
R27, RA4,
C11, C13,
R28, D3, D4,
MIC, L9, RA2,
R73, R74
( P ) SP phone Audio Check
and Confirmation
- 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)
IC1, C12, C73,
D13, D14,
R152, R73,
R74, RA2,
MIC, C11,
C13, RA4,
R27, R28,
R208, R209,
C96, C97,
R215, C72
( Q ) Charge Pump 2.5V Sup-
ply Confirmation
CP2.5V 1. Confirm that the voltage between testpoint CP2.5V and GND is 2.5V -0.1/
+0.3V.
C52, C53, C49
( R ) Charge Pump 4.0V Sup-
ply Confirmation
CP4.0V 1. Confirm that the voltage between testpoint CP4.0V and GND is 4.0V I0.2V. C50, C51
Items Check
Point
Procedure Check or
Replace Parts