Panasonic KX-TCD420RUT / KX-A142RUT Service Manual ▷ View online
15 ADJUSTMENTS (HANDSET)
If your unit have below symptoms, adjust or confirm each item using remedy column from the table.
Symptom
Remedy*
The movement of Battery Low indicator is wrong.
Make confirmation in item (A)~(C), (F)~(G)
The handset does not respond to a call from base unit.
Make adjustments in item (A)~(C), (H), (J)~(N)
The handset does not transmit or the transmit frequency is off.
Make adjustments in item (A)~(C), (H)~(K), (M)
The transmit frequency is off.
Make confirmation in item (A)~(C), (H)~(K), (M)
The transmit power output is low, and the operating distance between base unit and handset is
less than normal.
less than normal.
Make confirmation in item (I), (L)
The reception sensitivity of base unit is low with noise.
Make confirmation in item (L)
Does not link between base unit and handset.
Make confirmation in item (A)~(C), (H)~(N)
The reception level is high or low.
Make adjustments in item (O)
The transmit level is high or low.
Make adjustments in item (P)
* : Refer to Adjustment (P.49)
15.1. Adjustment
Please follow the items below when BBIC or EEPROM are replaced.
Items
Adjustment
Point
Procedure
Check or
Replace Parts
(A)
4.0V Supply
Confirmation
-
1.
Confirm that the consumption current is < 200mA , that is, there is no short
circuit.
circuit.
2.
Confirm that the voltage between TP14 and GND is 4.1V ± 0.2V.
IC1,F1,R21,
R4,C33,L2,
D1,C15,C2,
C14,Q1,R3,
R2,D2,R22,
C14,Q1,R3,
R2,D2,R22,
C26,X1,C16,
C17
(B)
VBACK Status
Confirmation
-
1.
Confirm that the voltage between TP18 and GND is 0V ± 0.4V.
IC1,F1,R21,
R4,C33,L2,
D1,C15,C2,
C14,Q1,R3,
R2,D2,R22,
C14,Q1,R3,
R2,D2,R22,
C26,R16,X1,
C16,C17
(C)
BBIC Confirmation
-
1.
BBIC Confirmation (Execute the command "getchk").
2.
Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
IC1,X1,C16,
C17
(D) Charge Control Check &
Charge Current Monitor
Confirmation
-
1.
Apply 6V between TP5(+) and TP6(-) with current limit of PSU to 200mA.
2.
Confirm that the charge current is ON/OFF.
3.
SW to decrease current limit of PSU to 100mA.
4.
Confirm that the charge current is stable.
IC1,D4,L4,
L5,Q2,Q3,
R6,D2,R22,
C26,F1,R21,
R4,C33
(E)* Charge Detection (OFF)
Confirmation
-
1.
Stop supplying 6V to TP5(+) and TP6(-).
2.
Execute the command "charge".
3.
Confirm that the returned value is 0x00 (hex).
IC1,D4,L4,
L5,Q2,Q3,
R6,D2,R22,
C26,F1,R21,
R4,C33
(F)*
Battery Monitor
Confirmation
-
1.
Apply 2.3V ± 0.005V between TP3(+) and TP4(-).
2.
Execute the command "readbatt".
3.
Confirm:
98 < returned value < A8 (Hex)
4.
Execute the command "WRTBAT2 XX".
XX: (returned value) - 06 (Hex)
IC1,D4,L4,
L5,Q2,Q3,
R6,D2,R22,
C26,F1,R21,
R4,C33
(G) Battery low Confirmation
-
1.
Apply 2.40V between TP3(+) and TP4(-).
2.
Confirm that there is no Speaker sound (Battery low alarm).
3.
Apply 2.20V between TP3(+) and TP4(-).
4.
Confirm that there is Speaker sound (Battery low alarm).
IC1,F1,R21,
R4,C33,C12,
C31,R17,R20,
C10,C11,D6,
D7
(H)* BBIC Clock Adjusment
TP19
1.
Execute the command "conttx".
2.
Adjust the frequency of TP19 executing thecommand "setfreq 00 xx (where xx
is the value)" so that the reading of the frequency counter is 10.368000MHz ±
3Hz.
is the value)" so that the reading of the frequency counter is 10.368000MHz ±
3Hz.
IC1,L3,C57,
IC3,X1,C16,
C17
49
KX-TCD420RUT / KX-A142RUT
Items
Adjustment
Point
Procedure
Check or
Replace Parts
(I)*
Transmitted Power
Confirmation
TP15
Remove the Antenna before starting step from 1 to 5.
1.
1.
Configure the DECT tester(CMD60) as follows;
<Setting>
·
Test mode: PP
·
RFPI: 0102030405
·
Traffic Channel: 5
·
Traffic Slot: 4
·
Mode: Loopback
2.
Execute the command "testmode".
3.
Execute the command "regcmd60"
4.
Initiate connection from DECT tester.
5.
Confirm that the NTP value at A201 (TP15) is 20dBm ~ 25dBm
IC1,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
(J)
Modulatoin Check and
Adjusment
TP15
Follow steps 1 to 4 of (I) above.
5. Confirm that the B-Field Modulation is 340kHz/div ~ 402kHz/div using data
type Fig31.
type Fig31.
6. Adjust the B-Field Modulation if required. (Execute the command "Readmod"
and "Writemod xx", where xx is the value.)
and "Writemod xx", where xx is the value.)
IC1,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
(K)
Frequency Offset
Confirmation
-
Follow steps 1 to 4 of (I) above.
5. Confirm that the frequency offset is < ± 50kHz.
IC1,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
(L)
Sensitivity Receiver
Confirmation
-
Follow steps 1 to 4 of (I) above.
5. Set DECT tester power to -88dBm.
6. Confirm that the BER is < 1000ppm.
IC1,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
(M)
Timing Confirmation
-
Follow steps 1 to 4 of (I) above.
5. Confirm that the Timing accuracy is < ± 10ppm.
IC1,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
(N)*
RSSI Level
Confirmation
-
Follow steps 1 to 4 of (I) above.
5. Set DECT tester power to -88dBm.
6. Execute the command "readrssi"
7. Confirm that the returned value is 0x34 ± A (hex).
IC1,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
(O)*
Receive Audio Check
and Confirmation
TP15
1.
Configure the DECT tester (CMD60) as follows;
<Setting>
·
Test mode: PP
·
Mode: Nomal
·
RFPI: 0102030405
2.
Execute the command "testmode".
3.
Execute the command "regcmd60"
4.
Initiate connection from DECT tester.
5.
Execute the command "openaudio".
6.
Confirm that the value of EEPROM address "F3F" is "02". (If the value is not
"02 (by User)", set "02" and power off and power on, and return to clause 2.)
"02 (by User)", set "02" and power off and power on, and return to clause 2.)
7.
Input audio signal (50mVrms/1kHz tone) from DECT tester.
<DECT tester setting>
·
Scramble: On
·
AF Gen to ADPCM: On
·
AF Meter Input: AF Voltm
·
AF Gen Frequency: 1000Hz
·
AF Gen Level: 50mVrms
8.
Confirm hearing tone: 300mV ± 250mV (Just check Audio path)
9.
Confirm that the audio distortion with DECT tester is < 5 %.
IC1,C12,C31,
R17,R20,C10,
C11,D7,D6,
IC3,C54,C66,
C60,L3,C57,
C55,C56,C62,
R23,R24,C63,
R23,R24,C63,
C64,C65,R18
50
KX-TCD420RUT / KX-A142RUT
Items
Adjustment
Point
Procedure
Check or
Replace Parts
(P)
Transmit Audio Check
and Confirmation
TP15
1.
Configure the DECT tester (CMD60) as follows;
<Setting>
·
Test mode: FP
·
Mode: Normal
·
RFPI: 0102030405
2.
Execute the command "testmode".
3.
Execute the command "regcmd60".
4.
Initiate connection from DECT tester.
5.
Execute the command "openaudio".
6.
Confirm that the value of EEPROM address "F3F" is "02". (If the value is not
"02 (by User)", set "02" and power off and power on, and return to clause 2.)
"02 (by User)", set "02" and power off and power on, and return to clause 2.)
7.
Input audio signal (30mVrms/1kHz tone) to DECT tester.
<DECT tester setting>
·
Scramble: On
·
AF Gen to ADPCM: Off
·
AF Meter Input: ADPCM
·
AF Gen Frequency: 1000Hz
·
AF Gen Level: 30mVrms
8.
Confirm hearing tone: 300mV ± 250mV (Just check Audio path)
9.
Confirm that the audio distortion with DECT tester is < 5 %.
IC1,C8,R7,
R8,C6,C7,
C5,R5,R1,
C5,R5,R1,
C4,IC3,C54,
C66,C60,L3,
C57,C55,C56,
C62,R23,R24,
C63,C64,C65,
C62,R23,R24,
C63,C64,C65,
R18
Note:
After the measuring, sock up the solder of TP.
* : PC Setting (P.42) is required beforehand.
The connection of adjustment equipment are as shown in Adjustment Standard (Handset) (P.52).
51
KX-TCD420RUT / KX-A142RUT
15.2. Adjustment Standard (Handset)
When connecting the Simulator Equipments for checking, please refer to below.
C54
R23
R24
D1
C63
C66
C62
C65
C14
TP1
TP2
PbF
SP
SP
C2
C15
L2
L3
D7
D3
D5
C10
R17
C12
R11
R16
C22
C30
C8
C3
C26
C28
C29
C6
R8
D2
D4
C16
C17
R12
R22
Q3
Q2
R4
C7
C4
C5
C33
MIC
R5
R7
R1
D6
C11
R20
R2
R3
C21
C25
R19
D5
IC1
IC2
100
80
30
F1
50
5
8
4
1
1
R18
C27
TP18
C20
C23
C18
L5
L4
R21
R6
C24
X1
Q1
C31
TP19
TP13
TP17
TP14
TP16
TP12
TP3
TP4
TP10
BAT
GND
SCL
SDA
C57
C64
C56
C55
11
18
1
28
IC3
C60
DECT tester
CMD60
CMD60
(I) (J) (K) (L) (M)
(N) (O) (P)
(N) (O) (P)
Frequency
Counter
(H)
Digital
Volt Meter
(A)
Digital
Volt Meter
(B)
(C) (E) (F) (H) (I) (O) (P)
DC
6V
Oscilloscope
Current
Probe
(D) (E)
(D)
(D)
TP5
TP6
TP7
TP8
DC
2.20V ~ 2.40V
(F) (G)
To PC (JIG)
AF SG
(DECT TESTER CMD60)
AF Volt Meter
(DECT TESTER CMD60)
Note:
(A) - (P) is refered to ADJUSTMENTS (HANDSET) (P.49)
KX
-T
CD4
20RUT
/
K
X
-A142R
UT
52
Click on the first or last page to see other KX-TCD420RUT / KX-A142RUT service manuals if exist.