Panasonic KX-PRS110RUW / KX-PRS120RUW / KX-PRSA10RUW Service Manual ▷ View online
25
KX-PRS110RUW/KX-PRS120RUW/KX-PRSA10RUW
9.1.1.
Check Power
9.1.1.1.
Base Unit
Is the AC Adaptor inserted into AC outlet? (*1)
Cross Reference:
Power Supply Circuit (P.11)
Note:
(*1) Refer to Specifications (P.7) for part number and supply voltage of AC Adaptor.
Is input of IC302 about 5.5 V?
Check C321, C341 are not shorted.
Check AC Adaptor.
Check Power Supply Circuit.
Is the output voltage of IC302 about 3V?
Does BBIC (IC501: XTAL1) oscillate at 10.368 MHz?
Check X501.
Check BBIC (IC501).
Is the Collector of Q301 about 1.8 V?
Is BBIC (IC501: RSTn) High?
Check BBIC (IC501).
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is the Collector of Q302 about 2.5 V?
YES
Is the output voltage of BBIC (IC501:CP_VOUT2)
about 3.0V?
about 3.0V?
Is the output voltage of BBIC (IC501:CP_VOUT1)
about 3.0V?
about 3.0V?
YES
YES
NO
NO
NO
26
KX-PRS110RUW/KX-PRS120RUW/KX-PRSA10RUW
9.1.1.2.
Handset
Cross Reference:
Power Supply Circuit/Reset Circuit (P.14)
9.1.2.
Check Battery Charge
9.1.2.1.
Base Unit
Cross Reference:
Charge Circuit (P.14)
9.1.2.2.
Handset
Cross Reference:
Check Power (P.25)
Charge Circuit (P.14)
Charge Circuit (P.14)
Check Power Supply Circuit/Reset Circuit .
Check BBIC (IC1).
Check F1 is not open.
Check X1.
Is the voltage of BATT+2.3V more?
Check the battery and around BATT+ and
BATT - are not shorted.
BATT - are not shorted.
Is the battery inserted BATT+ and BATT -?
Does BBIC (IC1: G1) oscillate at 20.736 Hz?
YES
YES
YES
YES
NO
NO
YES
Is the voltage of +1.8V about 1.8 V?
Is the voltage of +3.0V about 3.0 V?
Check BBIC (IC1).
YES
Is the voltage of LED+ about 9.0V?
(When LED is On)
(When LED is On)
YES
NO
NO
NO
Check around L3, Q8, and BBIC(IC1).
NO
Is the voltage of +3.4V about 3.4 V?
YES
Check Charge Circuit of Base Unit.
Check Handset.
Plug in the AC Power source.
Charge Handset on Base Unit.
Charge Handset on Base Unit.
Is the voltage of two charge contacts about
3 V or more?
3 V or more?
OK
NO
Check Charge Contacts at
Base Unit from mechanical point of view.
Base Unit from mechanical point of view.
YES
Is BBIC (IC1: R2) high at charge state?
Check Charge Circuit.
Check Power of Handset.
Is Check Power OK?
NO
NO
YES
27
KX-PRS110RUW/KX-PRS120RUW/KX-PRSA10RUW
9.1.3.
Check Link
9.1.3.1.
Base Unit
Note:
(*1) Refer to Troubleshooting by Symptom (Base Unit) (P.35)
Cross Reference:
Check Point (Base Unit) (P.35)
Power Supply Circuit (P.11)
Power Supply Circuit (P.11)
Check around Power Supply Circuit.
Refer to Check Point...(B).
Does Base Unit make link with normal working
Handset?
Handset?
Check around X501 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).
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).
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
NO
NO
Is the Sensitivity Receiver OK?
Refer to Check Point...(M).
Refer to Check Point...(M).
YES
Is the Power RAMP OK?
Refer to Check Point...(N) .
Refer to Check Point...(N) .
Replace with a new Circuit Board.
Is the voltage of VDD3 about 3.0V?
Is the voltage of VDD1 about 1.8V?
Adjust VDD1 voltage to 1.8V.
28
KX-PRS110RUW/KX-PRS120RUW/KX-PRSA10RUW
9.1.3.2.
Handset
Note:
(*1) Refer to Troubleshooting by Symptom (Handset) (P.37)
Cross Reference:
Check Point (Handset) (P.37)
Power Supply Circuit/Reset Circuit (P.14)
Power Supply Circuit/Reset Circuit (P.14)
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 adjust clock frequency.
Refer to Check Point...(H).
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
YES
NO
NO
NO
Replace with a new Circuit Board.
Is the voltage of +3.0V about 3.0 V?
Refer to Check Point...(P) .
Refer to Check Point...(P) .
Does the RF clock (CLK) oscillate: 20.736 MHz
in Handset Test Mode?
Refer to Check Point...(H).
in Handset Test Mode?
Refer to Check Point...(H).
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 1.8V voltage to 1.8 V.
Refer to Check Point...(A).
Refer to Check Point...(A).
... Continued to the next page.
Is the voltage of LED+ about 9.0 V?
(When LED is ON)
Refer to Check Point...(Q).
(When LED is ON)
Refer to Check Point...(Q).
NO
YES
Is the voltage of +3.4V about 3.4V?
Check around L3, Q8, and BBIC(IC1).
NO
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