Read Panasonic KX-TU301RUME Service Manual online
15
KX-TU301RUME
8.1.3.
Check GSM Link
Cross Reference:
Power Supply Circuit (P.8)
NO
YES
YES
YES
NO
NO
NO
Check around Power Supply Circuit.
Is there GSM tester ?
Is the voltage of VRTC about 2.0V?
Refer to Check Point...(A).
Refer to Check Point...(A).
Insert TEST SIM card.
Is the voltage of VSIM about 2.85V or 1.8V?
Is the voltage of VSIM about 2.85V or 1.8V?
Is the voltage of VIO about 2.85V?
Refer to Check Point...(B).
Refer to Check Point...(B).
NO
YES
Does Handset make link with GSM tester?
Refer to Check Point...(G).
Refer to Check Point...(G).
...
YES
YES
NO
NO
Replace with a new Circuit Board.
Is the Phase error (RMS) of GSM 900MHz OK?
Refer to Check Point...(K).
Refer to Check Point...(K).
Is the transmit power of GSM 900MHz OK?
Refer to Check Point ...(J).
Refer to Check Point ...(J).
NO
YES
YES
Is the Phase shift error (Peak) of GSM 900MHz OK?
Refer to Check Point...(L).
Refer to Check Point...(L).
... Continued to the next page.
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