Read Panasonic KX-TG7851UAB / KX-TG7851UAH / KX-TG7861UAB / KX-TGA785RUB / KX-TGA785RUH Service Manual online
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KX-TG7851UAB/KX-TG7851UAH/KX-TG7861UAB/KX-TGA785RUB/KX-TGA785RUH
9.1.1.2.
Handset
Cross Reference:
Power Supply Circuit/Reset Circuit (P.15)
9.1.2.
Check Battery Charge
9.1.2.1.
Base Unit
Cross Reference:
Charge Circuit (P.15)
9.1.2.2.
Handset
Cross Reference:
Check Power (P.26)
Charge Circuit (P.15)
Charge Circuit (P.15)
Check Power Supply Circuit/Reset Circuit .
Check BBIC (IC1).
Check F1 is not open.
Check X1.
Is the voltage of BATT+ 2.3 V 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: 7) oscillate at 10.368 MHz?
YES
YES
YES
YES
NO
NO
YES
YES
Is the voltage of +1.8V about 1.8 V?
Is the voltage of CP3V about 3.0 V?
Check BBIC (IC1).
YES
Is the voltage of CP4.0 about 4.0 V?
(When LED is On)
(When LED is On)
YES
Is the voltage of CP2.8V about 2.8 V?
NO
NO
NO
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: 34) high at charge state?
Check Charge Circuit.
Check Power of Handset.
Is Check Power OK?
NO
NO
YES
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