Panasonic KX-TG1843ALS, Service Manual

Page: 35 / 93

Items Check
Point
Procedure Check or
Replace Parts
( F ) Charge Control Check &
Charge Current Monitor
Check
- 1. Apply 6V between J3(+) and J4(-) with DC power supply and set current limit to
250mA.
2. Confirm that the current limit LED of DC power supply is ON/OFF.
3. Decrease current limit ofDC power supply to 100mA.
4. Confirm that the current limit LED of DC power supply is stable. (Current limiter
is ON.)
(Ifcharge control cannot be confirmed by this procedure, please use battery to
handset power supply and try again.)
IC1, Q4, Q5,
Q9, D6, L4,
L5, C119,
C120, R5, R6,
R7, R72, F1
( G )* Charge Detection (OFF)
Check
- 1. Stop supplying 6V to ) and CHARGE(-).
2. Execute the command “Backloff” then “charge”.
3. Confirm that the returned value is 00 (hex).
IC1, Q4, Q5,
Q9 D6, D7,
L4, L5, C119,
C120, R5, R6,
R7, R72, F1
( H )* Battery Monitor Check - 1. Apply 2.25V between BATT and GND.
2. Execute the command “readbatt”.
It assumes that the return value is XX.
a) 1E XX 2C: No need to adjust
b) XX: 18 ~ 1D: Need to adjust
XX: 2D ~ 32: Need to adjust
Write AD value of2.25V to EEPROM.
ex) read data: XX = 1D, write data: YY = 1D
read data: XX = 2D, write data: YY = 2D
EEPROM = 0004(Low Voltage) write “YY”
Execute the command “wreeprom 00 04 01 YY”.
EEPROM = 0005(No Voltage) write “YY - 1D”
Execute the command “wreeprom 00 05 01 ZZ”.
EEPROM = 000A(Low Voltage BL) write “YY - 06”
Execute the command “wreeprom 00 0A 01 WW”.
Note:
ZZ = YY - 1D, WW = YY - 06
No Voltage writing data limit is ‘00’.
c) XX: 00 ~ 17: Reject
XX: 33 ~ FF: Reject
IC1, F1, C1
C3, C118
( I ) Battery Low
Confirmation
- 1. Apply 2.40V between B) and BATTERY(-).
2. Confirm that there is no flashing of Battery Icon.
3. Apply 2.25V ± 0.08V between B) and BATTERY(-).
4. Confirm that there is flashing of Battery Icon.
IC1, F1, C1
C3, C118
( J )* BBIC Clock Adjustment CLK 1. Apply 2.6V between B) and BATTERY(-) with DC power.
2. Execute the command “conttx”.
3. Input Command “rdeeprom 00 01 01”, then you can confirm the current value.
4. Adjust the frequency of CLK executing the command “setfreq xx (where xx is
the value)” so that the reading ofthe frequency counter is 10.368000MHz ±
10Hz.
Note:
CLK is displayed only for a few seconds when executing the command “conttx”
after battery is inserted.
IC1, X1, CN6,
C7, R54, C62
(
K
)* Transmitted Power
Confirmation
- Remove the Antenna before starting step from 1 to 4.
1. Configure the DECT tester (CMD60) as follows;
<Setting>
• • • •
Test mode: PP
• • • •
RFPI: 0102030405
•
• •
•
Traffic Carrier: 5
• • • •
Traffic Slot: 4
•
• •
•
Mode: Loopback
• • • •
RF LEVEL = -70dBm
2. Execute the command “regcmd60 01 02 03 04 05”.
3. Initiate connection from DECT tester.
4. Confirm that the NTP value at A201 is 20dBm ~ 25dBm.
IC1, R54, C62,
C123, C60,
C63, C45,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
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KX-TG1843ALS / KX-TGA122AZS / KX-TGA121AZS