Mita-Kyocera PF7E Service Manual 03
Chapter 3 HARDWARE NOTES
Hardware Notes
Introduction
3.1 Introduction
This chapter describes an operational overview of the paper feeder. It ensures correct understanding of the behavior of both the mechanical and electrical mechanism of the paper feeder to
assist servicing.
The following basic functions of the paper feeder are discussed in the following pages.
❐ Friction-retarded roller (FRR) system
❐ Electrical parts, page 3-6
❐ IC details and pin assignments, page 3-9
❐ Feed motor driver, SLA7024M (U4), page 3-10
❐ Tray motor driver, TA8428K (U5), page 3-11
, page 3-5
3-2
PF-7E
Hardware Notes
Overall block
3.2 Overall block
Figure 3.1 Feeder main board
The diagram below shows the main board and the components of the paper feeder. For a fully
detailed schematic information, see Chapter 5 Schematic diagram
.
The KP-531 board provides liaison for the manual feed sensor signal as well as giving an identifying signal that the PF-7E is installed with the printer.
The printer recognizes installation of the PF-7E when pin #6 of YC782 on KP-502 [Envelope
feeder mount board] on the printer (=YC1 on KP-531 on the PF-7E) turns to L. This signal
turns to H in case an envelope feeder EF-1 is installed.
Refer to the connector pin assignment for YC-1 below. Pin #6 is grounded for the PF-7, which
left open for the EF-1, effectively allowing the printer to identify either of these option feeders.
Figure 3.2 YC-1 connector on KP-531
OP
VDD
MON*
UNIT*
OP
PF7UNIT*
PEMP*
SGND
HANDS
PGND
10
1
2
3
4
5
6
7
8
9
Identifies the PF-7 installation
Unused for the PF-7
Manual feed sensor for printer
PF-7E
3-3
Hardware Notes
Overview of feeder operation
3.3 Overview of feeder operation
The PF-7E feeds paper which turns on the PF-7E’s feed sensor. If the printer’s feed sensor will
not turn on in 2 seconds since the PF-7E’s feed sensor has turned on, the PF-7E forces paper
into the printer. Unlikewise, the precedent PF-7 feeder pauses when its feed sensor has turned
on until the printer’s feed sensor turns on.
To avoid paper jam caused when several sheets of paper are fed at one time, the feeder uses the
friction-retarded roller (FRR) system for paper feed. The operating theory for this system follows this section.
Figure 3.3 Feeder interface to printer
Printer manual feed roller
Feed roller (See page 3-5.)
Subsequently-fed paper
3-4
PF-7E
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