Panasonic KX-TG5581RUB / KX-TGA551RUB Service Manual ▷ View online
26
KX-TG5581RUB/KX-TGA551RUB
9.1.3.
Check Link
9.1.3.1.
Base Unit
Note:
(*1) Refer to Troubleshooting by Symptom (Base Unit and Charger Unit) (P.35)
Cross Reference:
Check Point (Base Unit) (P.35)
Power Supply Circuit (P.9)
Power Supply Circuit (P.9)
Check around Power Supply Circuit.
Adjust VDD1 voltage to 1.8 V.
Refer to Check Point...(B).
Refer to Check Point...(B).
Does Base Unit make link with normal working
Handset?
Handset?
Check around X1 and adjust clock frequency.
Refer to Check Point...(G).
Refer to Check Point...(G).
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...(K).
Refer to Check Point...(K).
Is the voltage of VDD3 about 2.85 V?
Refer to Check Point...(A).
Refer to Check Point...(A).
Is there CMD60 (: DECT Tester)?
Does the RF clock (CLK) oscillate at 10.368 MHz in
Base Unit Test Mode?
Refer to Check Point...(G).
Base Unit Test Mode?
Refer to Check Point...(G).
Is the voltage of VDD1 about 1.8 V?
YES
Is the NTP value OK?
Refer to Check Point...(J).
Refer to Check Point...(J).
Does Base Unit make link with CMD60 in Base Unit
Test Mode?
Refer to Check Point...(J).
Test Mode?
Refer to Check Point...(J).
NO
YES
Base Unit is OK. Check Handset.
YES
YES
Is the Frequency Offset OK?
Refer to Check Point...(L).
Refer to Check Point...(L).
NO
OK
27
KX-TG5581RUB/KX-TGA551RUB
Cross Reference:
Check Point (Base Unit) (P.35)
YES
NO
NO
NO
NO
Is the Frequency Drift OK?
Refer to Check Point...(L).
Refer to Check Point...(L).
YES
Is the Sensitivity Receiver OK?
Refer to Check Point...(M).
Refer to Check Point...(M).
YES
Is the Timing OK?
Refer to Check Point...(N).
Refer to Check Point...(N).
YES
Is the Power RAMP OK?
Refer to Check Point...(O).
Refer to Check Point...(O).
Replace with a new Circuit Board.
...
28
KX-TG5581RUB/KX-TGA551RUB
9.1.3.2.
Handset
Note:
(*1) Refer to Troubleshooting by Symptom (Handset) (P.38)
Cross Reference:
Check Point (Handset) (P.38)
Power Supply Circuit/Reset Circuit (P.12)
Power Supply Circuit/Reset Circuit (P.12)
Check around Power Supply Circuit/Reset Circuit.
Check BBIC (IC1)
Does Handset make link with Base Unit?
(Correct working unit)
(Correct working unit)
Check around X1 and IC801 and adjust
clock frequency.
Refer to Check Point...(H).
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).
Refer to Check Point...(A).
YES
YES
YES
YES
YES
YES
NO
NO
NO
Replace with a new Circuit Board.
Is the voltage of CP3.0V about 3.0 V?
Refer to Check Point...(Q).
Refer to Check Point...(Q).
Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
Refer to Check Point...(H).
in Handset Test Mode?
Refer to Check Point...(H).
YES
Is the NTP value OK?
Refer to Check Point...(I).
Refer to Check Point...(I).
Does Handset make link with CMD60 in
Handset Test Mode?
Refer to Check Point...(I).
Handset Test Mode?
Refer to Check Point...(I).
NO
Handset is OK. Check Base Unit.
YES
OK
Is there CMD60 (: DECT Tester)?
NO
NO
YES
Is the modulation OK?
Refer to Check Point...(J).
Refer to Check Point...(J).
YES
Is the Frequency Offset OK?
Refer to Check Point...(K).
Refer to Check Point...(K).
Adjust C10 voltage to 1.8 V.
Refer to Check Point...(A).
Refer to Check Point...(A).
... Continued to the next page.
Is the voltage of CP4.0V about 4.0 V?
Refer to Check Point...(R).
Refer to Check Point...(R).
29
KX-TG5581RUB/KX-TGA551RUB
Cross Reference:
Check Point (Handset) (P.38)
NO
NO
NO
YES
Is the Sensitivity Receiver OK?
Refer to Check Point...(O).
Refer to Check Point...(O).
YES
Is the Frequency Drift OK?
Refer to Check Point...(N).
Refer to Check Point...(N).
YES
Is the Power RAMP OK?
Refer to Check Point...(P).
Refer to Check Point...(P).
Replace with a new Circuit Board.
...
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