Epson LQ 1050 Technical Manual - Page 85

Paper Feed Control Circuit and Software Control

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2.3.5 Printer Mechanism Control This section describes following operating principles: . Carriage Control Circuit and Software Control q Paper Feed Control Circuit and Software Control q Print Control Circuit REV.-A 2.3.5.1 Carriage Control Circuit The carriage mechanism of the printer is driven by the carriage motor. Reversing the motor rotation, holding, and phase switching for the carriage motor are controlled by the 4-phase stepper motor drive IC (IC2A: STK6722HZ). This IC (IC2A) is controlled by a gate array (IC3A: E05A15HA) which is controlled by the CPU. The rotational speed of the carriage motor is controlled by another gate array (IC3A: E05A16GA). This gate array (IC7A) also outputs the power-down signal (PD 1 ) that shuts off carriage motor drive voltage Vu when a hardware error is detected. Figure 2-33 shows the block diagram of the carriage motor control circuit. CPU P?7 ( 4 B ) PDO m m GA (E?5A 15H$) -m *m CRC CRD (3A) - m PD1 ~ m Pco PC3 (7A) GA (E05A 16GA) Figure 2-33. Carriage Motor Control Block Diagram 2-41

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REV.-A
2.3.5 Printer Mechanism Control
This section describes following operating principles:
. Carriage Control Circuit and Software Control
Paper Feed Control Circuit and Software Control
Print Control Circuit
2.3.5.1 Carriage Control Circuit
The carriage mechanism of the printer is driven by the carriage motor. Reversing the motor rotation,
holding, and phase switching for the carriage motor are controlled by the 4-phase stepper motor drive
IC
(IC2A:
STK6722HZ). This
IC
(IC2A)
is controlled by a gate array
(IC3A:
E05A15HA) which is controlled
by the CPU. The rotational speed of the carriage motor is controlled by another gate array
(IC3A:
E05A16GA). This gate array
(IC7A)
also outputs the power-down signal (PD 1 ) that shuts off carriage
motor drive voltage Vu when a hardware error is detected. Figure 2-33 shows the block diagram of
the carriage motor control circuit.
CPU
P?7
(4B)
PDO
m
m
GA
(E?5A
15H$)
CRC
-
m
CRD
*
m
(3A)
-
m
PD1
~
m
Pco
PC3
(7A)
GA
(E05A
16GA)
Figure 2-33. Carriage Motor Control Block Diagram
2-41