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Model
KX-TG8125RU KX-TGA810RU KX-TGA810RUS KX-TGA810RUT
Pages
100
Size
4.18 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS ANSWERING SYSTEM
File
kx-tg8125ru-kx-tga810ru-kx-tga810rus-kx-tga810rut.pdf
Date
PREV: Panasonic KX-TG8125RU / KX-TGA810RU (serv.man2) Service Manual / Supplement

Panasonic KX-TG8125RU / KX-TGA810RU / KX-TGA810RUS / KX-TGA810RUT Service Manual ▷ View online

45
KX-TG8125RU/KX-TGA810RU
9.2.
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. 
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 (Base Unit) (P.45)
9.2.1.
Check Point (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH is replaced.
Note:
After the measuring, suck up the solder of TP.
*: PC Setting (P.60) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.62).
Items
Check 
Point
Procedure
Check or 
Replace Parts
(A) 3.3V Supply Confirma-
tion
VDD3
1. Confirm that the voltage between test point VDD3 and GND is 3.3V ± 0.2V.
IC1, C31, C32, 
R38, R39, C36, 
C37
(B) 2.5V Supply Confirma-
tion
VDD2
1. Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.2V.
Q9, C70, C71
(C)* 1.8V Supply Confirma-
tion
VDD1
1. Confirm that the voltage between test point VDD1 and GND is 1.8V ± 0.1V. 
Q8, R72, D12, 
C68
(D)*
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.
IC7, R37, C62, 
C63, X1, C72, 
R75~R81, R62, 
R63
(E)* EEPROM Confirmation
-
1. EEPROM Confirmation (Execute the command “ChkTG8120XXrevYY.bat”).
XX: country code
YY: revision number
2. Confirm the returned checksum value.
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.60).
IC5, C51, R62, 
R63, Q14, C50, 
R57~R61
(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.
IC10, C111, 
C112, X1, R73, 
C62, C63
46
KX-TG8125RU/KX-TGA810RU
(G)* Hookswitch Check with 
DC Characteristics
-
1. Connect CN1 (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 nor-
mal 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.
L1, L2, Q3, R14, 
R15, Q4, R16, 
R17, IC7, D3
(H)* DTMF Generator Check
-
1. Connect CN1 (Telephone Socket) to DTMF tester. (Road=600 
Ω)
2. Link Handset and push dial key.
3. Confirm DTMF character.
4. Confirm that the high Group is -3dBm ± 2dBm.
5. Confirm that the low Group is -3dBm ± 2dBm.
IC7, R67, IC6, 
R116, C141, 
R29, C22, C23, 
R18~R24, 
C14~C17, Q5, 
D4
(I)* Transmitted Power Con-
firmation
-
Remove the Antenna before starting step from 1 to 7.
1. Configure the DECT tester (CMD60) as follows;
<Setting>
• Short A_1 and 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”.
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.
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(J)
Modulation Check and 
Adjustment
-
Follow steps 1 to 6 of (I).
7.Confirm that the B-Field Modulation is -350 ~ -400/+320 ~ +370kHz/div using
data type Fig31.
8.Adjust the B-Field Modulation if required. (Execute the command “readmod”
and “wrtmod xx”, where xx is the value.)
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(K) Frequency Offset Check
-
Follow steps 1 to 6 of (I).
7.Confirm that the frequency offset is < ± 45kHz.
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(L)
Frequency Dirft Confir-
mation
-
Follow steps 1 to 6 of (I).
7.Confirm that the frequency drift is < ± 30kHz/ms.
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
Items
Check 
Point
Procedure
Check or 
Replace Parts
47
KX-TG8125RU/KX-TGA810RU
(M)
Sensitivity Receiver 
Confirmation
-
Follow steps 1 to 6 of (I).
7.Set DECT tester power to -90dBm.
8.Confirm that the BER is < 1000ppm.
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(N)
Timing Confirmation
-
Follow steps 1 to 6 of (I).
7.Confirm that the Timing accuracy is < ± 2.0ppm.
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(O)* RSSI Level Confirmation
-
Follow steps 1 to 6 of (I).
7.Execute the command “readrssi”.
8. Confirm that the returned value is 22 ± A (hex).
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(P) Power RAMP Confirma-
tion
-
Follow steps 1 to 6 of (I).
7.Confirm that Power RAMP is matching.
IC7, IC10, L7, 
L3, L4, L6, 
C117, C118, 
C119, C120, 
C124, C125, 
R106, R109, 
DA1, C102, 
R102, R103, 
Q10, C110, 
C112, R111, 
C126, C127, 
R112
(Q)*
Audio Check
-
1. Link with Handset.
2. Input -45dBm/1kHz to MIC of Handset.
Measure the Level at Line I/F and distortion level.
3. Confirm that the level is -10dBm ± 2dBm and that the distortion level is < 5%
at TEL Line (600
Ω Load).
4. Input -20dBm/1kHz to Line I/F.
Measure the level at Receiver of Handset and distortion level
(*Receive volume set to second position from minimum). 
5. Confirm that the level is -21dBm ± 2dBm and that the distortion level is < 5%
at Receiver (Volume Middle, 150
Ω Load).
IC7, CN1, SA1, 
L1, L2, D3, Q3, 
Q4, R14, R15, 
R16, R17
(R)
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.
R55, R56, C48, 
C49
(S)
TAM Operation 
Confirmation
-
1. TAM Confirmation (Execute the command “sendchar_VPI”)
2. Confirm the returned Value (Value is “D887RN”).
IC8, IC9, R89, 
R91, R92
Items
Check 
Point
Procedure
Check or 
Replace Parts
48
KX-TG8125RU/KX-TGA810RU
9.2.2.
Check Point (Charger Unit)
Note:
After the measuring, suck up the solder of TP.
The connection of adjustment equipment is as shown in Adjustment Standard (Charger Unit) (P.63).
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 3.3V ± 0.2V.
R2, R1,
R3, R4
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