Check Playback; Check Battery Charge - Panasonic KX-TG4221N Service Manual

KX-TG4221N/KX-TG4222N/KX-TG4223N/KX-TG313SK/KX-TG4224N/KX-TG4225N/KX-TGA421N

10.1.3. Check Playback

10.1.3.1. Base Unit
Check VDDC (1.2 V): Test Point [VDDC]
Check output of BBIC (Pin 29, 31).
Check Speaker and its surroundings.
Cross Reference:
Power Supply Circuit/Reset Circuit (P.13)

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.14)
10.1.4.2. Handset
Is Check Power OK?
Is BBIC (IC5: 34) high at charge state?
Cross Reference:
Check Power (P.32)
Charge Circuit (P.22)
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.22)
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.69).
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.
34