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KX-TG4753B/KX-TG470B/KX-TGA405B
10.1.5. Check Playback
10.1.5.1. 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.12)
10.1.6. Check Battery Charge
10.1.6.1. 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.13)
10.1.6.2. Handset
Is Check Power OK?
Is BBIC (IC1: 34) high at charge state?
Cross Reference:
Check Power (P.34)
Charge Circuit (P.21)
10.1.6.3. 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.21)
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.85).
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
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