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Model
KX-TG6811CAB KX-TG6811CAM KX-TG6812CAB KX-TG6821CAB KX-TG6821CAM KX-TG6822CAB KX-TGA681RUB KX-TGA681RUM
Pages
95
Size
7.58 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS ANSWERING SYSTEM
File
kx-tg6811cab-kx-tg6811cam-kx-tg6812cab-kx-tg6821ca.pdf
Date
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Panasonic KX-TG6811CAB / KX-TG6811CAM / KX-TG6812CAB / KX-TG6821CAB / KX-TG6821CAM / KX-TG6822CAB / KX-TGA681RUB / KX-TGA681RUM Service Manual ▷ View online

29
KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
9.1.2.
Check Battery Charge
9.1.2.1.
Base Unit
Cross Reference:
Charge Circuit (P.16)
9.1.2.2.
Handset
Cross Reference:
Check Power (P.28)
Charge Circuit (P.14)
Check Charge Circuit of Base Unit.
Check Handset.
Plug in the AC Power source.
Charge Handset on Base Unit.
Is the voltage of two charge contacts about
3 V or more?
OK
NO
Check Charge Contacts at 
Base Unit from mechanical point of view.
YES
Is BBIC (IC1: 34) high at charge state?
Check Charge Circuit.
Check Power of Handset.
Is Check Power OK?
NO
NO
YES
30
KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
9.1.3.
Check Link
9.1.3.1.
Base Unit
Note:
(*1) Refer to Troubleshooting by Symptom (Base Unit) (P.39)
Cross Reference:
Check Point (Base Unit) (P.39)
Power Supply Circuit (P.13)
Check around Power Supply Circuit.
Adjust +3.0V voltage to 3.0 V. 
Refer to Check Point...(B).
Does Base Unit make link with normal working
Handset? 
Check around X501 and adjust clock frequency.
Refer to Check Point...(E) .
NO
NO
NO (*1)
NO
YES
YES
YES
YES
YES
NO
NO
NO
Replace with a new Circuit Board.
Is the modulation OK? 
Refer to Check Point...(I) .
Is the voltage of VBAT about 3.0 V?
Refer to Check Point...(A).
Is there CMD60 (: DECT Tester)?
Does the RF clock (CLK) oscillate at 13.824 MHz in
Base Unit Test Mode?
Refer to Check Point...(E) .
Is the voltage of +3.0V about 3.0 V?
YES
Is the NTP value OK? 
Refer to Check Point...(H).
Does Base Unit make link with CMD60 in Base Unit 
Test Mode?
Refer to Check Point...(H).
NO
YES
Base Unit is OK. Check Handset.
YES
YES
Is the Frequency Offset OK? 
Refer to Check Point...(J) .
NO
OK
NO
NO
Is the Sensitivity Receiver OK?
Refer to Check Point...(K).
YES
Is the Power RAMP OK?
Refer to Check Point...(L) .
Replace with a new Circuit Board.
31
KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
9.1.3.2.
Handset
Note:
(*1) Refer to Troubleshooting by Symptom (Handset) (P.41)
Cross Reference:
Check Point (Handset) (P.41)
Power Supply Circuit/Reset Circuit (P.16)
Check around Power Supply Circuit/Reset Circuit .
Check BBIC (IC1)
Does Handset make link with Base Unit?
(Correct working unit)
Check around X1 and adjust clock frequency. 
Refer to Check Point...(H).
NO
NO
NO
NO (*1)
NO
Is the voltage of "1.8V" about 1.8 V?
Refer to Check Point...(A).
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
Replace with a new Circuit Board.
Is the voltage of CP3V about 3.0 V?
Refer to Check Point...(P) .
Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
Refer to Check Point...(H).
YES
Is the voltage of CP2.8V about 2.8 V?
Refer to Check Point...(R).
Is the NTP value OK?
Refer to Check Point...(I).
Does Handset make link with CMD60 in
Handset Test Mode?
Refer to Check Point...(I).
NO
Handset is OK. Check Base Unit.
YES
OK
Is there CMD60 (: DECT Tester)?
NO
NO
NO
YES
Is the modulation OK?
Refer to Check Point...(J).
YES
Is the Frequency Offset OK?
Refer to Check Point...(K).
Adjust 1.8V voltage to 1.8 V.
Refer to Check Point...(A).
... Continued to the next page.
Is the voltage of CP4V about 4.0V? 
(When LED is ON)
Refer to Check Point...(Q).
Check D3
32
KX-TG6811CAB/KX-TG6811CAM/KX-TG6812CAB/KX-TG6821CAB/KX-TG6821CAM/KX-TG6822CAB/KX-TGA681RUB/KX-TGA681RUM
Cross Reference:
Check Point (Handset) (P.41)
NO
NO
Is the Sensitivity Receiver OK?
Refer to Check Point...(L).
YES
YES
Is the Power RAMP OK?
Refer to Check Point...(M).
Replace with a new Circuit Board.
...
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