30
KX-TG9471B/KX-TG9472B/KX-TGA939T
9.1.3.
Check Link
9.1.3.1.
Base Unit
Cross Reference:
Power Supply Circuit
(P.9)
Check Point (Base Unit)
(P.40)
Note:
(*1) Refer to
Troubleshooting by Symptom (Base Unit and Charger Unit)
(P.40).
Check around
Power Supply Circuit
.
Adjust TP1.8 V voltage to 1.8 V.
Refer to
Check Point...(E)
.
Does Base Unit make link with normal working
Portable?
Check around X501 and RF module and adjust
clock frequency.
Refer to
Check Point...(H)
.
NO
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...(L)
.
Is the voltage of TP+3.3 about 3.3 V?
Refer to
Check Point...(B)
.
Is the voltage of TP4.0V about 4.0 V?
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...(H)
.
NO
YES
Is the voltage of TP+2.5V about 2.5 V?
Refer to
Check Point...(C)
.
Is the voltage of TP+1.8 V about 1.8 V?
YES
Is the voltage of TP 3.0V about 3.0 V?
YES
Is the NTP value OK?
Refer to
Check Point...(K)
.
Does Base Unit make link with CMD60 in
Base Unit Test Mode?
Refer to
Check Point...(K)
.
NO
YES
Base Unit is OK. Check Portable.
NO
YES
YES
Is the Frequency Offset OK?
Refer to
Check Point...(M)
.
NO
Check around Q381 and IC501: 104, 103
NO
OK
...
Continued to the next page.
