AR-LC1N
(4) Solenoid and clutch drive circuit
The solenoids and clutches are driven by a Darlington transistor array M63823P with 7-circuit clen tamp dihe CPode.U? LPs portFS is turned on wh
output is at H. LPFC has the same circuit.
+24V
IC2
M63823P
SOL
CPU(IC6)LPFS/
29 LPFSCN-A-8
P66/FTOB
/TMRI110.5K
7.2K
3K
(5) Lift motor drive circuit
The tray height is adjusted according to the size of the paper mounted on the paper feed tray.ti onalThe dilifrectit motoonr controls the rota
(CW/CCW) with the control signals (LLMU, LLMD) from the CPU. The circuit forms a bridge circuit wiWt controlh STA457C . to allow the CW/CC
A fuse (F1) is provided to protect the motor against shorting or overload.
IC2F1
1-E4
314+24V(LLSW)
LLMUIC3
2 7
STA457C1.25A/120V
R21 1KR20 1K172T1.0A/250V LLM+
IC21833CN-A-3
8
413R22 1KR18 1K 644
LLMD699R3C13
5103.9K0.1uF
1-E4(1/4W)
D2D3LLM-
510
R17R19CN-A-4
1SS133x210K10K
CPU port
Lift motor
LLMDLLMU
Forward rotation (UP)LH
Forward rotation (DOWN)HL
OFFLL
Suppose that both LLMD and LLMU become H level at the above circuit. If LLMU becomes H first, the STApi457C pin 13 n 3 become H, IC04
through IC07 pin 6 become H due to diode D20. Even if LLMU is at H and LLMD at H on the port, STA4t H, thus no57C pin 1 is at L and pin 6 a
conduction of STA457C is achieved.
(6) Transport motor drive circuit
U
V
W
HU
HV
HW
RE\
The motor drive circuit is composed of IC4 motor ICs (Q5 - 8 (transistor), IC2 and IC5). When the U mPade at H WM signall eoutvelput from, the CP
the transistor inside the IC5 turns on to supply current to the motor to start the motor. A (Hu,s the m Hv, Hw) iotor isn stside tarted,he hole signals
motor switch the input of IC4, while the output switches the transistor inside IC5. The motntor rolthus statste.arts rotating under non-co
When the motor rotates, the speed signal (RE) is output from the motor. The signal is taken i slnto tow, the CPhe RWU. IM sif tgnalhe motor speed is
On duty is increased to increase the speed; if the motor speed is high, the PWM signal On duty is decreased uired speed.to maintain the req
As the current flowing to the motor becomes large, the input voltage at the minus side of the I the plC7 rius-sises. Ifde i the volnputtage exceeds
voltage, output voltage at IC7 becomes at L level, leading in the PWM signal to turn off the nt ttroansi the mstor otor iof Qs5 cut of so that f. the curre
(setting: 3A).
8/6/199911 - 2 |
ACEC
SHARP
