Epson Stylus COLOR 3000

Operating Principles
EPSON Stylus Color 3000 Service Manual
2-22
PF Motor Driver Circuit
The PF motor for this printer operates paper loading and feeding. The gate array E05B33 (IC6) outputs the
phase drive control signals (PFAPH and PFBPH), phase data signal (PFA0/1 and PPFB1/0) and voltage
reference data (PFV) to the driver IC UDN2917EB (IC17). The driver IC then controls the phase current
based on the voltage reference data. This sequence enables a micro step with a minimum of 1/720 inch at 2-
2 phase.
B
A
E05B33
(IC6)
UDN2917EB
(IC17)
PF Motor
PFA0
PFA1
PFB0
PFB1
PFAPH
PFBPH
PF A
PF B
A
B
I10
I11
I20
I21
PH1
PH2
PFV FREF1/2
PF A
PF B
Gate Array Driver IC
Figure 2-19. PF Motor Driver Circuit Block Diagram