38
KX-TG4753B/KX-TG470B/KX-TGA405B
10.1.5. Check Playback
10.1.5.1. Base Unit
Cross Reference:
Power Supply Circuit/Reset Circuit
(P.12)
Note:
Flash Memory is IC601.
BBIC is IC1.
(*1) Refer to
Circuit Board (Base Unit_Main)
(P.85).
10.1.6. Check Battery Charge
10.1.6.1. Base Unit
Cross Reference:
Charge Circuit
(P.13)
10.1.6.2. Handset
Cross Reference:
Check Power
(P.34)
Charge Circuit
(P.21)
10.1.6.3. Charger Unit
Cross Reference:
Charge Circuit
(P.21)
Check VDDC (1.2 V): Test Point [VDDC]
OK
Check
Power Supply Circuit.
Check output of BBIC (Pin 29, 31).
OK
Check BBIC and Flash Memory.
Check Speaker and its surroundings.
NO
NO
Check
Charge Circuit
of Base Unit.
Check Handset.
Plug in the AC Power source.
Charge Handset on Base Unit.
Is the voltage of two charge contacts about
3 V or more?
OK
NO
Check Charge Contacts at
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
Check
Charge Circuit
of Charger Unit.
Check Handset.
Plug in the AC Power source.
Charge Handset on Charger Unit.
Is the voltage of two charge contacts about
3 V or more?
OK
NO
Check Charge Contacts at Charger Unit
from mechanical point of view.
YES
