Overview; Adf Mechanism - Epson GT-1200 Service Manual

ADF

2.1 OVERVIEW

This chapter gives information on operating principles of the ADF which
can be used with the EPSON scanner GT-12000. The contents of this
chapter are as follows:
Section 2.1.1:

ADF mechanism

q Single feeding
q Reverse feeding
Section 2.1.2: Electrical Circuit
q Sensor circuits
q Reset circuits
q Driver circuits
q Rush current limitation circuit
q EEPROM write circuit
2.1.1 ADF Mechanism
See Figure 2-1 which shows major mechanism parts of the ADF and their
locations. In both Single/Reverse feeding modes, document is picked up
at the paper feed tray and is then transported in the ADF and ejected to
the output tray. This process is described step by step thorough out the
section.
Descriptions for single and reverse feedings are given separately. As you
follows the steps, make sure that you refer to Figure 2-1 for exact
locations of the parts and their functions.
Rev. A
E m p t y S e n s o r D o c u m e n t S h u t t e r
S e p a r a t i o n R o l l e r
D o c u m e n t W e i g h t
H a l f - m o o n R o l l e r
P a p e r F e e d R o l l e r
R e g i s t r a t i o n S e n s o r
R e g i s t r a t i o n R o l l e r
T i m i n g S e n s o r
D o c u m e n t W e i g h t
P a p e r F e e d M o t o r
W a i t S h u t t e r S o l e n o i d
( f o r w a r d )
T r a n s p o r t a t i o n M o t o r
P a p e r F e e d M o t o r
( f o r w a r d / b a c k w a r d )
( b a c k w a r d )
Figure 2-1. Major Mechanism Parts and Their Locations
Operating Principles
P a p e r F e e d T r a y
E j e c t R o l l e r
F l a p p e r
P a p e r E j e c t /
O u t p u t T r a y
R e v e r s e R o l l e r
T r a n s p o r t a t i o n B e l t
P a p e r E j e c t /
R e v e r s e S e n s o r
P l a t e n G l a s s
F l a p p e r S o l e n o i d
P a p e r E j e c t / R e v e r s e M o t o r
( f o r w a r d o n l y )
2-1