Panasonic KX-TCD286RUT / KX-TCA128RUT Service Manual ▷ View online
8.3.2. Flow Solder Side View
VDD3
A_1
CLK
TP23_JTAG
A_2
VDD2
TP9
LINE_DC
VDD1
TP10
TP24
TP25
DCP
DCM
PbF
PQUP11352Z
A
VDD4
ANT
TP_RLY1
L1T/TP_RLY2
L2T/TP_RLY3
L1R/TP_RLY4
TP_RLY5
L2R
PSU
6V DC
L1R
L1T
TP10
TX_AF
TX_AF
VDD1
+1.8V
+1.8V
VDD2
+2.5V
+2.5V
VDD3
+3.3V
+3.3V
A_1
(ANT1
Select)
Select)
A_2
(ANT2
Select)
Select)
-
+
Frequency
Counter
(10.368MHz)
Counter
(10.368MHz)
VDD4
+4.0V
+4.0V
TP9
RX_AF
RX_AF
LINE_DC
0.9V
off hook
0.9V
off hook
(I) (J) (K) (L) (M)
(N) (O) (P)
(N) (O) (P)
(F)
RF
Analyzer
Analyzer
(C)
(B)
(A)
DTMF
Tester
Tester
Call - ID
Simulator
Simulator
BELL
Simulator
Simulator
LOOP
Simulator
Simulator
AF
OSC
OSC
(Q)
(Q)
(G) (Q)
AF VOLT
METER
METER
OSC
600
(H)
Note:
(A) - (Q) is referred to Check Point (Base Unit) (P.26)
KX
-T
-T
CD2
86RUT
/
K
X
-T
CA1
28RUT
33
8.4. Check Point (Charger Unit)
Items
Check
Point
Procedure
Check or
Replace Parts
(A)
Charging Check
-
1.
Connect Charge Contact 12
Ω
/2W resistor between charge+ and charge-.
2.
Measure and confirm voltage across the resistor is 3.10V ± 0.2V.
D11, R12, R11
Note:
After the measuring, suck up the solder of TP.
The connection of adjustment equipment is as shown in Adjustment Standard (Charger Unit) (P.34).
The connection of adjustment equipment is as shown in Adjustment Standard (Charger Unit) (P.34).
8.5. Adjustment Standard (Charger Unit)
When connecting the Simulator Equipments for checking, please refer to below.
8.5.1. Flow Solder Side View
PbF
PQUP11431Z
PQLV30031UA
TP2
TP4
TP3
D11
R12
R157
R158
R11
TP1
A
Digital
Volt Meter
Volt Meter
(A)
12 /2W
TP2 (-)
TP1 (+)
Note:
(A) is referred to Check Point (Charger Unit) (P.34)
34
KX-TCD286RUT / KX-TCA128RUT
9 TROUBLESHOOTING BY SYMPTOM (HANDSET)
If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not.
(*1) or not.
Note:
(*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as acoustic
level in detail.
(*2) Refer to Check Point (Handset) (P.35)
level in detail.
(*2) Refer to Check Point (Handset) (P.35)
9.1. Check Point (Handset)
Please follow the items below when BBIC or EEPROM is replaced.
Note:
After the measuring, suck up the solder of TP.
*: PC Setting (P.39) is required beforehand.
The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.41).
*: PC Setting (P.39) is required beforehand.
The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.41).
Items
Check
Point
Procedure
Check or
Replace Parts
(A)* 1.8V Supply Adjustment
VDD1
1.
Confirm that the voltage between test point VDD1 and GND is 1.8V ± 0.02V.
2.
Execute the command “bandgap”, then check the current value.
3.
Adjust the 1.8V voltage of VDD1 executing command “bandgap XX”(XX is the
value).
value).
IC1, Q2, C40
(B)
DC/DC Supply
Confirmation
VDD3
1.
Confirm that the voltage between test point VDD3 and GND is 3.3V ± 0.3V
(Backlight is ON).
(Backlight is ON).
IC1, F1, C1,
C3, C57, R1,
Q1, D1, L1,
R57
(C)
2.5V Supply
Confirmation
VDD2
1.
Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.1V.
IC1, Q3, C4,
C5
(D)*
BBIC Confirmation
PC serial
port
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,C7,
R19
(E)* EEP-ROM Confirmation
PC serial
port
1.
EEP-ROM Confirmation (Execute the command “Chk_128XXvYY.bat”).
XX: country code
YY: revision number
2.
Confirm the returned checksum value is “9613”.
Note:
“XX”, “YY”, and “checksum” vary depending on the country version. You can
find them in the batch file, PQZZ- mentioned in JIG and PC (P.39).
find them in the batch file, PQZZ- mentioned in JIG and PC (P.39).
IC3, IC1, R39,
R40, R91,
R90, R96,
R90, R96,
Q10, Q11,
C113
35
KX-TCD286RUT / KX-TCA128RUT
Items
Check
Point
Procedure
Check or
Replace Parts
(F) Charge Control Check &
Charge Current Monitor
Check
TP20/TP21 1.
Apply 6V between TP20(+) and TP21(-) with DC power supply and set current
limit to 250mA.
limit to 250mA.
2.
Confirm that the current limit LED of DC power supply is ON/OFF.
3.
Decrease current limit of DC power supply to 100mA.
4.
Confirm that the current limit LED of DC power supply is stable. (Current limiter
is ON.)
is ON.)
(If charge control cannot be confirmed by this procedure, please use battery to
handset power supply and try again.)
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
PC serial
port
1.
Stop supplying 6V to CHARGE(+) 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
BATT
GND/PC
serial port
1.
Apply 2.25V between BATT and GND.
2.
Execute the command “readbatt”.
Assuming the returned 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 of 2.25V to EEPROM.
ex) read data: XX = 1D, write data: YY = 1D
read data: XX = 2D, write data: YY = 2D
EEPROM = 0X0004(Low Voltage) write “YY”, then
EEPROM = 0X0005(No Voltage) write “YY - 1D”
EEPROM = 0X000A(Low Voltage BL) write “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
Battery+/Ba
ttery-
1.
Apply 2.40V between BATTERY(+) and BATTERY(-).
2.
Confirm that there is no flashing of Battery Icon.
3.
Apply 2.25V ± 0.08V between BATTERY(+) and BATTERY(-).
4.
Confirm that there is flashing of Battery Icon.
IC1, F1, C1
C3, C118
(J)* BBIC Clock Adjustment Battery+/Ba
ttery-/PC
serial port
1.
Apply 2.6V between BATTERY(+) and BATTERY(-) with DC power.
2.
Execute the command “conttx”.
3.
Input Command “rdeeprom 00 01 01”, and confirm the current value.
4.
Adjust the frequency of CLK executing the command “setfreq xx (where xx is
the value)” so that the reading of the frequency counter is 10.368000MHz ±
10Hz.
the value)” so that the reading of the frequency counter is 10.368000MHz ±
10Hz.
Note:
CLK is displayed only for a few seconds when executing the command “conttx”
after battery is inserted.
after battery is inserted.
IC1, X1, CN6,
C7, R54, C62
(K)*
Transmitted Power
Confirmation
ANT/PC
serial port
Remove the antenna before starting step from 1 to 4.
1.
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,
C44, C47,
C46, C49,
C48, C50,
C53, C51,
R59, C54,
C55, CN6
36
KX-TCD286RUT / KX-TCA128RUT
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