Finisher Unit Basic Operation - Sharp AR-FN8 Service Manual

FINISHER UNIT BASIC OPERATION

1. This chapter discusses the purpose and role of each of the finisher's functions, and the prin-
ciples of operation used for the finisher mechanical and electrical systems. It also explains the
timing at which these systems are operated.The
sion of mechanical drive, and signals marked by
the flow of electrical signals.
2. In descriptions of digital circuits on the finisher, "1" indicates a high signal voltage level, while
"0" indicates a low signal voltage level. Voltage values differ according to the circuit.
A microprocessor is used on the finisher. A description of the microprocessor operation is
omitted in this chapter as it is practically impossible to check the internal operation of the
microprocessor.
Descriptions in this chapter also assume that PCBs will not be repaired at user sites. For this
reason, descriptions of circuits on PCBs are limited to block diagrams. Two types of block
diagrams are provided for separate functions: diagrams indicating details from sensors up to
input sections of major PCBs, and diagrams indicating details from the output sections of
major PCBs up the loads.
I. BASIC OPERATION .................. 2-1
A. Outline ................................. 2-1
B. Outline of Electrical
Circuitry ................................ 2-2
C. Inputs to and Outputs from the
Finisher Controller PCB ....... 2-4
II. FEED/DRIVE SYSTEM ............ 2-10
A. Outline ............................... 2-10
B. Type of Delivery Paths ....... 2-15
C. Feeding and Delivering ...... 2-18
CHAPTER 2
symbol in drawings indicates transmis-
together with the signal name indicates
D. Job Offset .......................... 2-21
E. Stapling Operation ............. 2-24
F. Stapler Unit ........................ 2-32
G. Tray Operation .................... 2-38
H. Detecting the Height of
Stack on the Tray ................ 2-40
I. Shutter Operation ............... 2-42
J. Buffer Path Operation ......... 2-46
K. Detecting Jams .................. 2-51
III. POWER SUPPLY SYSTEM ..... 2-56