AL-1611/AL-1622
ELECTRICAL SECTION
13 – 14
E. RESET CIRCUIT
This circuit detects ON/OFF of power to control start/stop of each circuit. The 5V voltage and WTOVF signal of the main PWB is detected by the reset
IC to generate the reset signal.
When the power voltage reaches the specified level, the circuit operations are started. Before the power voltage falls below the specified level, the cir-
cuit operations are stopped to prevent against malfunctions.
F. MAIN MOTOR DRIVE CIRCUIT
The main motor is driven by the MMD signal from ASIC. While the main motor is rotating, the MMD signal is driven to HIGH and passed through IC35
to the control circuit in the main motor to rotate the main motor. The /MMRDY signal is kept HIGH until the main motor speed reaches the specified
rpm, and passed to the CPU.
G. MIRROR MOTOR CIRCUIT
The mirror motor is a stepping motor, and it uses the IC29 and the constant current chopper control IC (SLA7027). For control, the CPU outputs the
drive signal to the IC29 to drive the mirror motor with 1-2 phase excitement.
IC3A
IC2
RESET
VSB
VSA
VCC
NJM2103M
74VHC09
1
/RESET
3
2
7
6
2
1
3
8
4
NP
C2
VCC
1
C
1
1
C
2
0
.1
C3
CPU
RES
WDTOVF
5
IC1
CPU
MM
IC31
Driver
IC32
2
18
4
96
97 /MMRDY#
MMD
14
/MMRDY
/MMD
IC5
ASIC
MIRROR
MOTOR
MMCC12
MMCC01
29
31
30
28
IC31
+
IC25
SLA7027MU
+
2200p
ICPN38
24V
/MMA
MMB
MMA
F6
2.4K
1.0(2W)
/MMB
4
7
/3
5
V
2.4K
2200p
1.0(2W)
4
7
0
p
4
7
0
p
6
2
0
1
00
6
2
0
4
7
K
5
1
0
4
7
K
22
/1
6
V
/MMRMO0
/MMRMO1
VCC
1
2
13
14
17
16
4
5
3
9
15
10
7
8
12
11
18
4
70
71
1
2
16
15
MIRMODA
MIRMODB
/MIRMODB
/MIRMODA
1
2
3
4
7
5
8
1
6
TDB
TDA
REFB
INA
RSA
INB
INA
INB
REFA
OUTB
VSB
VSA
RSB
OUTA
GA
OUTA
OUTB
GB