Pf Motor Driver Circuit - Epson STYLUS COLOR 3000 Service Manual

Operating Principles

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.
Gate Array
E05B33
(IC6)
PFA0
PFA1
PFB0
PFB1
PFAPH
PFBPH
PFV
2-22
Figure 2-19. PF Motor Driver Circuit Block Diagram
Driver IC
UDN2917EB
(IC17)
I10
I11 A
I20
I21
A
PH1
B
PH2
B
FREF1/2
EPSON Stylus Color 3000 Service Manual
PF Motor
PF A
PF A
PF B
PF B