DOWNLOAD Panasonic KX-TG6451CAT / KX-TGA641RUT Service Manual ↓ Size: 3.14 MB | Pages: 94 in PDF or view online for FREE

Model
KX-TG6451CAT KX-TGA641RUT
Pages
94
Size
3.14 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS PHONE
File
kx-tg6451cat-kx-tga641rut.pdf
Date

Panasonic KX-TG6451CAT / KX-TGA641RUT Service Manual ▷ View online

36
KX-TG6451CAT/KX-TGA641RUT
9.1.10. Check SP-phone Reception
Cross Reference:
Signal Route (P.14)
9.1.11. Check Corded Handset Transmission
Cross Reference:
Signal Route (P.14)
9.1.12. Check Corded Handset  Reception
Cross Reference:
Signal Route (P.14)
37
KX-TG6451CAT/KX-TGA641RUT
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 wether 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.37)
9.2.1.
Check Point (Base Unit)
Please follow the items below when BBIC, EEPROM or FLASH is replaced.
Note:
After the measuring, suck up the solder of TP.
*: Connections (P.51) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.53).
Items
Check 
Point
Procedure
Check or 
Replace Parts
(A) 3.5 V Supply Confirma-
tion
VDD3
1. Confirm that the voltage between test point VDD3 and GND is 3.5 V ± 0.2 V.
IC301,R311,
R312,C311,
D301,F301
(B) 3.75 V Supply Confirma-
tion
VDD5
1. Confirm that the voltage between test point VDD5 and GND is 3.75 V ± 0.2 V.
IC304,R384,
R385,C385,
D301,F301
(C) 2.5 V Supply Confirma-
tion
VDD2
1. Confirm that the voltage between test point VDD2 and GND is 2.5 V ± 0.2 V.
D311,IC303
(D) 3.0 V Supply Confirma-
tion
VDD4
1. Confirm that the voltage between test point VDD4 and GND is 3 V ± 0.2 V.
C504,R387,
IC501
(E) 1.8 V Supply Confirma-
tion
VDD1
1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.1 V. 
Q351,IC501
(F)*
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.
IC501
(G)* EEPROM Confirmation
-
1. EEPROM Confirmation (Execute the command “sendchar EPV”).
2. Confirm the returned value.
(Value for reference is written at”EEPROM C/SUM” in 
Software_Version_Table.xls)
Note:
“checksum” vary depending on the country version. You can find them in the
batch file, PNZZ- mentioned in The Setting Method of JIG (Base Unit) (P.51).
IC561
(H)* BBIC Clock Adjustment
CLK
GND_C
1. Check X’tal Frequency. (10.368 MHz ± 100 Hz).
Input Command “sendchar sfr”, then you can confirm the current value.
2. If the frequency is not 10.368 MHz ± 100 Hz, Adjust the frequency of CLK exe-
cuting the command “sendchar sfr XX YY (where XX YY is the value)” so that
the reading of the frequency counter is 10.368000 MHz ± 20 Hz.
IC501,X511
38
KX-TG6451CAT/KX-TGA641RUT
(I)* Hookswitch Check with 
DC Characteristics
-
1. Connect TIP/RING (Telephone Socket) to Tel-simulator which is connected
with 600 
Ω.
2. Set line voltage to 48 V and line current to 40 mA at off-hook condition of nor-
mal telephone.
3. Execute the command “hookoff”
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command “hookon”.
6. Confirm that the line current is less than + 0.8 mA.
P101,D101,
Q111,Q112,
R110,R111,
R112,R123,
R115,R117,
R118,D117
(J) DTMF Generator Check
-
1. Connect TIP/RING (Telephone Socket) to DTMF tester. (Load=600 
Ω)
2. Link cordless handset and push dial key.
3. Confirm DTMF character.
4. Confirm that the high Group is -3 dBm ± 2 dBm.
5. Confirm that the low Group is -6 dBm ± 2 dBm.
IC501,R154,
R153,C151,
Q131
(K)* Transmitted Power Con-
firmation
ANT2
Remove the Antenna before starting step from 1 to 7.
1. Configure the DECT tester (CMD60) as follows;
<Setting>
• Test mode: FP
• Traffic Carrier: 2
• Traffic Slot: 4
• Mode: Loopback
• PMID: 00000
• RF LEVEL = -70 dBm.
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 “ANT2”.
7. Confirm that the NTP value at ANT is 19.0 dBm ~ 25.0 dBm.
DA802,C859,
C803,DA801,
C812,L802,
IC801,IC501
(L)*
Modulation Check
ANT2
Follow steps 1 to 6 of (K).
7.Confirm that the B-Field Modulation is -370 ± 30/+370 ± 30 kHz/div using data
type Fig31.
DA802,C859,
C803,DA801,
C812,L802,
IC801,IC501
(M)* Frequency Offset Check
ANT2
Follow steps 1 to 6 of (K).
7.Confirm that the frequency offset is < ± 50 kHz.
DA802,C859,
C803,DA801,
C812,L802,
IC801,IC501
(N)* Frequency Dirft Confir-
mation
ANT2
Follow steps 1 to 6 of (K).
7.Confirm that the frequency drift is < ± 35 kHz/ms.
C803,DA801,
C812,L802,
IC801,IC501
(O)*
Sensitivity Receiver 
Confirmation
ANT2
Follow steps 1 to 6 of (K).
7.Set DECT tester power to -88 dBm.
8.Confirm that the BER is < 1000 ppm.
DA802,C859,
C803,DA801,
C826,R807,
C822,IC501
(P)*
Timing Confirmation
ANT2
(Through Cordless handset)
Follow steps 1 to 6 of (K).
7.Confirm that the Timing accuracy is 
• ± 5.0 ppm (When adjust the frequency of CLK in them (H).
• ± 15.0 ppm (When do not adjust the frequency of CLK in them (A).
DA802,C859,
C803,DA801,
C812,L802,
IC801,IC501
(Q)* RSSI Level Confirmation
ANT2
Follow steps 1 to 6 of (K).
7.Execute the command “readrssi”.
8. Confirm that the returned value is 22 ± A (hex).
DA802,C859,
C803,DA801,
C826,R807,
C822,IC501
Items
Check 
Point
Procedure
Check or 
Replace Parts
39
KX-TG6451CAT/KX-TGA641RUT
(R)
Audio Check
-
(Through Cordless handset)
1. Link with cordless handset.
2. Input -45 dBm (600
Ω)/1KHz to MIC of cordless handset.
Measure the Level at Line I/F and distortion level.
3. Confirm that the level is -5 dBm ± 2 dBm and that the distortion level is < 5 %
at TEL Line (600 
Ω Load).
4. Input -20 dBm (600
Ω)/1KHz to Line I/F.
Measure the level at Receiver of cordless handset and distortion level
(*Set Receive volume to first position from minimum). 
5. Confirm that the level is -20 dBm ± 2 dBm and that the distortion level is < 5 %
at Receiver (150 
Ω Load).
P101,D101,
Q111,Q112,
R110,R112,
R123,R115,
R117,R118,
D117Q131,
C151,R153,
R154,C152,
C154,C155,
R131,C142,
R146,IC501
-
(Through SP-PHONE)
1. Press Answer key ON.
2. Input  -45 dBm (600
Ω)/1KHz to the terminal for SP_Phone MIC on the Base
unit.
3. Measure and check the level at line I/F is 1.5 dBm ± 2 dBm and that the distor-
tion level is < 5 % at TEL Line (600 
Ω).
4. Input -20 dBm (600
Ω)/1KHz to Line I/F.
5. Measure and check the level at the terminal for SP_Phone receiver of the
Base unit is -12 dBm ± 2 dBm and that distortion level is <5 % (Set Receivr
volume set to 5th position from  minimum, On the measurement connection.)
Refer to Adjustment Standard (Base Unit) (P.53).
In addition to
(through Cord-
less handset)
IC201,L203,
L204,L201,
L201,SP,
Mic,R233,
R234,C232-234
D235,R232,
C235,R236
-
(Through Corded-Handset)
1. Set the Hook Switch to OFF-HOOK.
2. Input  -45 dBm (600
Ω)/1KHz to the terminal for Corded-handset MIC on the
Base unit.
3. Measure and check the level at line I/F is -13 dBm ± 2 dBm and that the distor-
tion level is < 5 % at TEL Line(600
Ω)
4. Input -20 dBm (600
Ω)/1KHz to Line I/F.
5. Measure and check the level at terminal for Corded-Handset receiver on Base
unit is -23 dBm ± 2 dBm and that distortion level is <5 % (Set Receiver volume
to second position from minimum, and load is 150 
Ω instead of  Receiver.)
Refer to Adjustment Standard (Base Unit) (P.53).
In addition to 
(through cord-
less handset)
IC201,L221-
L224
R213,R214
C213,C214
C224,C227
R222,R224
Corded-handset
(S)* Power RAMP Confirma-
tion
-
Follow steps 1 to 6 of (K).
7.Confirm that Power RAMP is matching.
Items
Check 
Point
Procedure
Check or 
Replace Parts
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