Panasonic KX-TG1843ALS, Service Manual

Page: 36 / 93

Items Check
Point
Procedure Check or
Replace Parts
( L )* Modulation Check and
Adjustment
- Follow steps 1 to 3 of (K) .
4.Confirm that the B-Field Modulation is -350 ~ -400/+320 ~ +370kHz/div using
data type Fig 31.
5.Adjust the B-Field Modulation ifrequired. (Execute the command “Readmod”
and “wrtmod xx”, where xx is the value.)
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( M ) Frequency Offset
Confirmation
- Follow steps 1 to 3 of (K) .
4.Confirm that the frequency Offset is < ± 45kHz.
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( N ) Frequency Drift
Confirmation
- Follow steps 1 to 3 of (K) .
4.Confirm that the frequency Drift is < ± 30kHz/ms.
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( O ) Sensitivity Receiver
Confirmation
- Follow steps 1 to 3 of (K) .
4.Set DECT tester power to -88dBm.
5.Confirm that the BER is < 1000ppm.
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( P ) Timing Confirmation - Follow steps 1 to 3 of (K) .
4.Confirm that the Timing accuracy is < ± 2.0ppm.
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( Q )* RSSI Level
Confirmation
- Follow steps 1 to 3 of (K) .
4.Set DECT tester power to -81dBm.
5.Execute the command “readrssi”.
6.Confirm that the returned value is 1C ± 8 (hex).
7.Set DECT tester power to -63dBm.
8.Execute the command “readrssi”.
9.Confirm that the returned value is 25 ± 8 (hex).
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( R ) Power RAMP
Confirmation
- Follow steps 1 to 3 of (K) .
4.Confirm that Power RAMP is matching.
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
( S ) Audio Check and
Confirmation
- 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 to MIC and measure Line output level.
4. Confirm that the level is -9.5dBm ± 2dBm and that the distortion level is < 5%
at TEL Line (600
Ω
Load).
5. Input -20dBm/1KHz to Line I/F and measure Receiving level at REV1 and
REV2.
6. Confirm that the level is -22.5dBm ± 2dBm and that the distortion level is < 5%
at Receiver. (vol = 2)
IC1, C37, C68,
C91, R25,
R26, C20,
C12, C87,
C109, R85,
C103, C10,
C17, R86,
R29, R37,
R38, D4, D5,
C69, C70, C95
36
KX-TG1843ALS / KX-TGA122AZS / KX-TGA121AZS