|
173
|
KX-F910BX
CIRCUIT OPERATION
(1) Power Circuit (charging circuit power supply)
Pins 1 and 8 are switched in the clock period which is determined by capacitor C560 connected to pin 3 of the
switching regulator IC (IC503). The switching output turns Q507 ON or OFF and reduces the 24V voltage to 12V.
Pin 5 of IC503 is the feedback input pin whose input signal is used to stabilize the output voltage.
Circuit Diagram
13-4. CIRCUIT OPERATION OF CORDLESS BASE UNIT
(2) Charge Circuit
When the portable handset is places on the charging stand, Q510 is turned ON, and the charging information is
supplied to MPU pin 34 as a logical high signal. When the charging information is supplied to the MPU, the MPU
sends the ID signal from pin 30. This ID signal switches Q509, and it is supplied to the portable handset via the
charging pin of Q509. In the same way, when the spare battery is inserted into the charging stand, Q512, is turned
ON, and the charging information is supplied to MPU pin 33. When both the portable handset and spare battery are
to be charged, the MPU outputs a logical low signal from pin 35 which turns Q513 OFF and also turns Q511 OFF,
thereby limiting the charging current to the spare battery. When only the spare battery is to be charged, the MPU
outputs a logical high signal from pin 35 which turns Q513 and Q511 ON so that the charging current is increased.
Circuit Diagram
VT(12V)
L511
Q507
R566
C560
R567
D503
R568
R569
C561
D504
IC503
8
7
6
5
C559
4
3
2
1
+24V
ANALOG
CN501
(1,2)
+
–
+
–
R565
D506
R655
Q511
C601
R657
R656
R659
Q510
R540
Q509
R650
D507
D508
Q513
Q512
R667
R669
R668
R665
R548
VT
30
34
35
33
MPU
(IC501)
C602
C604
L513
L514
L515
C603
R661
R662
R663
R664
C605
C606
CN503
M
M
M
S
S
C
+
–
+
–
–
–
–
–
–
VT
D505
4
5
6
8
7
Содержание KX-F910BX
Страница 1: ......
Страница 103: ... 109 KX F910BX ADJUSTMENT RF Unit Component View TPA TP1 TP2 TP3 GND VC201 PORTABLE HANDSET REFERENCE DRAWING ...
Страница 176: ......
Страница 177: ......
Страница 178: ......
Страница 179: ......
Страница 180: ......
Страница 181: ......
Страница 182: ......
Страница 183: ......
Страница 184: ......
Страница 185: ......
Страница 186: ......
Страница 187: ......
Страница 188: ......
Страница 189: ......
Страница 190: ......
Страница 191: ......
Страница 192: ......
Страница 193: ......
Страница 194: ......
Страница 195: ......
Страница 196: ......
Страница 197: ......
Страница 198: ......
Страница 199: ......
Страница 200: ......
Страница 201: ......
Страница 202: ......
Страница 203: ......
Страница 204: ......
Страница 205: ......
Страница 206: ......
Страница 207: ......
Страница 208: ......
Страница 209: ......
Страница 217: ......