Charger Unit - Panasonic KX-TG7731S Service Manual

KX-TG7731S/KX-TG7732S/KX-TG7733S/KX-TGA470S
10.1.3. Check Playback
10.1.3.1. Base Unit
Check VDD1(1.8V) :Test point (VDD1)
Check output of BBIC (Pin 41,43).
Check Speaker and its surroundings.
Cross Reference:
Power Supply Circuit/Reset Circuit (P.14)
10.1.4. Check Battery Charge
10.1.4.1. Base Unit
Plug in the AC Power source.
Charge Handset on Base Unit.
Is the voltage of two charge contacts about
3 V or more?
Check Charge Contacts at
Base Unit from mechanical point of view.
Cross Reference:
Charge Circuit (P.15)
10.1.4.2. Handset
Is Check Power OK?
Is BBIC (IC1: 34) high at charge state?
Cross Reference:
Check Power (P.34)
Charge Circuit (P.23)

10.1.4.3. Charger Unit

Plug in the AC Power source.
Charge Handset on Charger Unit.
Is the voltage of two charge contacts about
3 V or more?
Check Charge Contacts at Charger Unit
from mechanical point of view.
Cross Reference:
Charge Circuit (P.23)
OK
OK
YES
YES
YES
NO
Check Power Supply Circuit.
NO
Check BBIC and Flash Memory.
Note:
Flash Memory is IC601.
BBIC is IC1.
(*1) Refer to Circuit Board (Base Unit_Main) (P.81).
NO
Check Charge Circuit of Base Unit.
OK
Check Handset.
NO
Check Power of Handset.
NO
Check Charge Circuit.
NO
Check Charge Circuit of Charger Unit.
OK
Check Handset.
38