Panasonic KX-TCD287UAT / KX-TCA128UAT Service Manual ▷ View online
7.7. Bell Reception
7.7.1. Base Unit
7.7.2. Handset
Cross Reference:
Telephone Line Interface (P.48)
Check Link (P.20)
HOW TO CHECK THE HANDSET SPEAKER OR RECEIVER (P.44)
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KX-TCD287UAT / KX-TCA128UAT
8 TROUBLESHOOTING BY SYMPTOM (BASE UNIT AND
CHARGER UNIT)
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.
level in detail.
(*2) Refer to Check Point (Base Unit) (P.26)
8.1. Check Point (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH ROM is replaced.
Note:
After the measuring, suck up the solder of TP.
*: PC Setting (P.30) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.32) and Adjustment
Standard (Handset) (P.41).
Standard (Handset) (P.41).
Items
Check
Point
Procedure
Check or
Replace Parts
(A)
3.3V Supply
Confirmation
VDD3
1.
Confirm that the voltage between test point VDD3 and GND is 3.3V ± 0.2V.
D1, IC1, C1,
C9, C114, C3,
C8, C2, R8, R9
(B)
2.5V Supply
Confirmation
VDD2
1.
Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.2V.
Q2, C5, C7
(C)*
1.8V Supply
Confirmation
VDD1
1.
Confirm that the voltage between test point VDD1 and GND is 1.8V ± 0.1V.
Q3, C11, D20,
R161, L15, C4,
C37, C39, C44,
C45
(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.
IC8, X1, C42,
C43, R40, C28,
R84~R88, R64,
R84~R88, R64,
R55~R57
(E)* EEP-ROM Confirmation
PC serial
port
1.
EEP-ROM Confirmation (Execute the command “chk_287XXvYY”).
XX: country code
YY: revision number
2.
Confirm the returned checksum value is “1E461”.
3.
The checksum is displayed in the last output line.
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.30).
find them in the batch file, PQZZ- mentioned in JIG and PC (P.30).
IC3, C53, R56,
R57
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KX-TCD287UAT / KX-TCA128UAT
Items
Check
Point
Procedure
Check or
Replace Parts
(F)* BBIC Clock Adjustment
CLK
1.
Input Command “rdeeprom 00 01 01”, then you can confirm the current value.
2.
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.
IC2, R124,
R125, C153,
X1, C42, C43,
R40
(G)* Hookswitch Check with
DC Characteristics
CN3
1.
Connect CN3 (telephone Socket) to tel-simulator which is connected with 600
Ω
.
2.
Set line voltage to 48V and line current to 40mA at off-hook condition of
normal telephone.
normal telephone.
3.
Execute the command “hookoff”
4.
Confirm that the line current is 40mA ± 5mA.
5.
Execute the command “hookon”.
6.
Confirm that the line current is less than + 0.8mA.
CN1, L6, L7,
Q4, R23, R25,
Q5, R26, R28,
Q5, R26, R28,
IC8, D3
(H)* DTMF Generator Check
CN3
1.
Connect CN1 (telephone socket) to DTMF tester. (load=600
Ω
)
2.
Link handset and push dial key.
3.
Confirm DTMF character.
4.
Confirm that the high group is -5.0 ~ -1.0 dBm.
5.
Confirm that the low group is -10.0 ~ -8.0 dBm.
IC8, R39, C41,
R49, C46, C47,
R42, R43, R44,
R45, R46, R47,
R42, R43, R44,
R45, R46, R47,
R48, C108,
C109, C40,
C109, C40,
C36, Q8, D4
(I)*
Transmitted Power
Confirmation
ANT
Remove the antenna before starting step from 1 to 7.
1.
1.
Configure the DECT tester (CMD60) as follows;
<Setting>
•
Short A_1-GND and A_2-GND.
•
Test mode: FP
•
Traffic Carrier: 5
•
Traffic Slot: 4
•
Mode: Loopback
•
PMID: 00000
•
RF LEVEL = -70dBm.
2.
Execute the command “testmode”.
3.
Execute the command “sendchar dmv 2 2”.
4.
Check that “signalling status” has been set to “Locked”, then press “ACCEPT
RFPI”.
RFPI”.
5.
Initiate connection from Dect tester (“set up connect”)
6.
Execute the command “ANT1”.
7.
Confirm that the NTP value at ANT is 20dBm ~ 25dBm.
IC2, IC8, R124,
R125, C153,
C140, C141,
C140, C141,
DA1, C142,
C143, C144, L3,
L4, R118, R119,
L4, R118, R119,
C135, R115,
R116, Q6,
C145, C147,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C155
(J)
Modulation Check and
Adjustment
ANT
Follow steps 1 to 6 of (I) above.
7.Confirm that the B-field modulation is -350 ~ -400/+320 ~ +370kHz/div using
data type Fig31.
data type Fig31.
8.Adjust the B-field modulation if required. (Execute the command “readmod”
and “wrtmod xx”, where xx is the value.)
and “wrtmod xx”, where xx is the value.)
IC2, IC8, R124,
R125, C153,
C140, C141,
C140, C141,
DA1, C142,
C143, C144, L3,
L4, R118, R119,
L4, R118, R119,
C135, R115,
R116, Q6,
C145, C147,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C155
27
KX-TCD287UAT / KX-TCA128UAT
Items
Check
Point
Procedure
Check or
Replace Parts
(K) Frequency Offset Check
ANT
Follow steps 1 to 6 of (I) above.
7.Confirm that the frequency offset is < ± 45kHz.
IC2, IC8, R124,
R125, C153,
C140, C141,
C140, C141,
DA1, C142,
C143, C144, L3,
L4, R118, R119,
L4, R118, R119,
C135, R115,
R116, Q6,
C145, C147,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C155
(L)
Frequency Drift
Confirmation
ANT
Follow steps 1 to 6 of (I).
7.Confirm that the frequency drift is < ± 30kHz/ms.
IC2, IC8, R124,
R125, C153,
C140, C141,
C140, C141,
DA1, C142,
C143, C144, L3,
L4, R118, R119,
L4, R118, R119,
C135, R115,
R116, Q6,
C145, C147,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C155
(M)
Sensitivity Receiver
Confirmation
ANT
Follow steps 1 to 6 of (I).
7.Set DECT tester power to -90dBm.
8.Confirm that the BER is < 1000ppm.
IC2, IC8, R124,
R125, C153,
C140, C141,
C140, C141,
DA1, C142,
C143, C144, L3,
L4, R118, R119,
L4, R118, R119,
C135, R115,
R116, Q6,
C145, C147,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C155
(N)
Timing Confirmation
ANT
Follow steps 1 to 6 of (I).
7.Confirm that the Timing accuracy is < ± 2.0ppm.
IC2, IC8, R124,
R125, C153,
C140, C141,
C140, C141,
DA1, C142,
C143, C144, L3,
L4, R118, R119,
L4, R118, R119,
C135, R115,
R116, Q6,
C145, C147,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C149, C151,
C157, R123,
C158, C159,
C160, C161,
C162, C163,
C164, C136,
R117, R127,
C156, C154,
C155
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KX-TCD287UAT / KX-TCA128UAT
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