Panasonic KX-TG6561BXT Service Manual page 33

9.1.5.2. Handset
Does Handset make link with Base Unit?
(Correct working unit)
NO
Is the voltage of "1.8V" about 1.8 V?
Refer to Check Point...(A).
YES
Is the voltage of CP3.0V about 3.0 V?
Refer to Check Point...(Q).
YES
Is the voltage of CP4.0V about 4.0 V?
Refer to Check Point...(R).
YES
Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
Refer to Check Point...(H).
YES
Is there CMD60 (: DECT Tester)?
YES
Does Handset make link with CMD60 in
Handset Test Mode?
Refer to Check Point...(I).
YES
Is the NTP value OK?
Refer to Check Point...(I).
YES
Is the modulation OK?
Refer to Check Point...(J).
YES
Is the Frequency Offset OK?
Refer to Check Point...(K).
YES
Continued to the next page.
Note:
(*1) Refer to Troubleshooting by Symptom (Handset) (P.44)
Cross Reference:
Check Point (Handset) (P.44)
Power Supply Circuit/Reset Circuit (P.16)
YES
Handset is OK. Check Base Unit.
NO
Adjust C10 voltage to 1.8 V.
Refer to Check Point...(A).
OK
Check around Power Supply Circuit/Reset Circuit.
NO
Check BBIC (IC1)
NO
NO
Check around X1 and IC801 and adjust
clock frequency.
Refer to Check Point...(H).
NO (*1)
NO
NO
Replace with a new Circuit Board.
NO
NO
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KX-TG6561BXT/KX-TGA651BXT
NO