11.1.11. MAIN 3V REGULATOR (SEE Fig. 29)
The BBIC measures the battery voltage on pins 58 using an internal ADC. If the battery voltage
is below 3.36 V, TC3 is switched to power off mode. R7 and C5 provide a reset pulse (TP84)
used for resetting the BBIC when power on. The +3 V supply (TP10) is fed to the BBIC, Flash
PROM, EEPROM, and Display Driver.
11.1.12. BATTERY CHARGING CIRCUIT (SEE Fig. 29)
The charge circuit is designed to operate with a constant current charger in the base. L1, L2, D2
and D4 protect against electro-static discharge (ESD). The charging current from the base is
turned on and off by T1 using a control signal from the BBIC (pin 39, TP6) via T2. R3 provides
initial current in the event of a totally flat battery, and D6 protects against the high voltage
present on the charge contacts if there is no battery in the handset. R4 and R5 provide a signal
for the BBIC to detect (pin 40) that the handset had been placed on the base charger. If the
handset is off, it will be switched on, and charging will start.
Circuit Diagram
12. ADJUSTMENT (BASE UNIT)
26
Содержание KX-TCD952NLB
Страница 2: ...1 LOCATION OF CONTROLS 2...
Страница 3: ...2 DISASSEMBLY INSTRUCUTIONS 3...
Страница 9: ...4 4 SELECTING THE HANDSET RINGER VOLUME 4 5 SELECTING THE BASE UNIT RINGER VOLUME 9...
Страница 11: ...6 BLOCK DIAGRAM RF UNIT BASE UNIT 11...
Страница 12: ...7 BLOCK DIAGRAM BASEBAND SECTION AND LINE INTERFACE BASE UNIT 12...
Страница 20: ...9 BLOCK DIAGRAM RF UNIT HANDSET 20...
Страница 21: ...10 BLOCK DIAGRAM BASE BAND SECTION HANDSET 21...
Страница 36: ...36...
Страница 37: ...16 2 HANDSET LINK 37...
Страница 38: ...38...
Страница 39: ...39...
Страница 40: ...16 3 HANDSET DOES NOT LINK 16 4 BASE UNIT DOES NOT CHARGE 40...
Страница 41: ...16 5 HANDSET DOES NOT CHARGE 41...
Страница 42: ...16 6 NO VOICE RECEPTION 42...
Страница 43: ...16 7 NO VOICE TRANSMISSION 16 8 BASE UNIT DOES NOT LINK 43...
Страница 44: ...17 CABINET AND ELECTRICAL PARTS LOCATION BASE UNIT 44...
Страница 45: ...18 CABINET AND ELECTRICAL PARTS LOCATION HANDSET 45...
Страница 46: ...19 ACCESSORIES AND PACKING MATERIALS 46...
Страница 58: ...22 1 SCHEMATIC DIAGRAM HANDSET U Q KXTCD952NLB UK Printed in Japan 58...