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R8 NiMH B2 B1 T1 a b c SK2 R1 C8 Re1 D4 D2
R2 R3 R4
B6 TS2 R6
Ledn Pwrs Iosc Rs Rd Rc Sel Gnd
Vin Vcc Disn IC1 Sco Enn En Scan Sci R5 R7
A1 4/5A NiCd
SK2c-a 200-240V SK2c-b 100-130V B1 power plug B2 rectifier B3 electronic on/off switch B4 up-converter B5 motor control B6 charging circuit B7 battery B8 motor
B3 B4 L1 R31 IC2b IC2c IC2d TS3
R25 R28 SK1 R26 C12 TS5 C13 C2
B6. Charging circuit As NiMH batteries may not be continuously loaded with a high charging current, the HQ562 has a timer IC (IC1). This IC controls TS2 in such a way that a current of 200 mA is supplied to the battery for about 8 hours, after which TS2 switches to a trickle charging current of 25 mA. D3 and D4 suppress high voltage peaks. This circuit is not required in the HQ561 because in this shaver the NiCD battery is continuously charged at 200 mA via R8. The value of R8 equals the internal resistance of TS2. B7. Battery The 4/5A NiCd battery of the HQ561 has a capacity of 1200mAH. The capacity of the AA NiMH battery of the HQ562 is 1100 mAH. B8. Motor The motor is of the permanent magnet type. Zener diode D7 suppresses high voltage peaks during shaving. Normally, this diode is placed between the motor solder tags to suppress radio interference (RIF) in the mains as well. As TS5 makes it impossible to switch the motor on when the shaver is connected to the mains, D7 is now placed on the PCB. GENERAL Some resistors are not indicated in the electrical diagram. These are resistors of 0 Â½ which serve as jumpers across print tracks or as interconnectors between the layers of the double-layer PCB.