Mita-Kyocera ST20 CHAPTER4
Chapter 4
Hardware note
Chapter 4 Contents
4-1 Introduction ...................................................................................................................................... 4-3
4-1-1 Notes on power............................................................................................................................... 4-3
4-2 Troubleshooting............................................................................................................................... 4-4
4-2-1 Analyzing basic hardware symptoms.............................................................................................. 4-4
4-2-2 Checking the 24 V DC and 5 V DC lines ........................................................................................ 4-6
(1) Checking the 24 V DC line ............................................................................................................ 4-6
(2) Checking the 5 V DC line .............................................................................................................. 4-7
4-2-3 Power supply/indicator panel problem............................................................................................ 4-8
(1) Power supply problem ................................................................................................................... 4-8
(2) Indicator panel problem ................................................................................................................. 4-8
4-2-4 Interface problem............................................................................................................................ 4-9
(1) Call service person C1 or C4......................................................................................................... 4-9
4-2-5 Mechanical problem...................................................................................................................... 4-10
4-2-6 Feed motor problem ......................................................................................................................4-11
4-2-7 Duplexer selection solenoid problem............................................................................................ 4-12
4-2-8 Sensor problem ............................................................................................................................ 4-13
(1) Inlet sensor .................................................................................................................................. 4-13
(2) Paper tray exit sensor.................................................................................................................. 4-14
(3) Paper tray full sensor................................................................................................................... 4-15
4-2-9 Location of sensors....................................................................................................................... 4-16
4-3 Paper jam problem......................................................................................................................... 4-17
4-3-1 Analyzing paper jam problem (basic)............................................................................................ 4-18
4-3-2 Analyzing paper jam problems...................................................................................................... 4-19
4-1 Introduction
This chapter explains procedures for identifying and correcting bulk stacker problems
(troubleshooting). Most of problems concerning the bulk stacker may arise from defects in the
interface with the printer as the bulk stacker is directly controlled by the printer electronics. The
Analyzing basic hardware symptoms chapter 4, section 4-2-1 on next page allows to determine
whether the problem is caused by a defect in the interface with the printer or in the bulk stacker's
power supply.
This chapter covers the following troubleshooting procedures.
Power supply/indicator panel problem
Interface problem
Driving unit (paper transportation) problem
Sensor problem
Error massages
Paper jam
The diagram indicating the locations of the sensors is attached at the end of section 4-2.
4-1-1 Notes on power
The power supply/motor driver board includes AC circuit. To avoid electrical shock hazard, a great
care should be exercised when handling the power supply/motor driver board and other AC cablings.
Unless instructed to be plugged to the power source, the bulk stacker's power cord must be
disconnected from power.
4-3
ST-20
4-2 Troubleshooting
When bulk stacker malfunction occurs, begin troubleshooting by going through the following
flowchart.
4-2-1 Analyzing basic hardware symptoms
Following this chart allows analyzing basic problems concerning the bulk stacker hardware. The
bulk stacker should be left installed to the printer in normal manner while following the flowchart.
Bulk stacker's connector (on top
of bulk stacker) mated properly
with the printer's?
Yes
Remove the right side cover of
bulk stacker. See Chapter 2;
section 2-2-3.
Is J7 (interface) of controller
board in bulk stacker connected
properly?
Yes
Continued on next page
No
No
Turn power off and try
remounting the printer on the
bulk stacker.
Connect properly.
ST-20
4-4
Continued
+5 V at pin 3 of J1 on controller
board?
No
Turn printer power off.
Disconnect stacker power cord
from the outlet.
Remove bulk stacker's top
cover. Remove jumper wires
TJ1 and TJ2 from controller
board, and insert them to (TJ1)
and (TJ2), respectively.
Connect bulk stacker power
cord from the outlet.
Feed motor rotates?
No
Yes
Yes
Remove the left side cover of
bulk stacker. See chapter 2;
section 2-2-2.
Yes
5 V DC at pin 3 (white) of
stacker connector?
Replace harness of bulk stacker
connector.
Replace printer engine board.
Replace power supply/motor
driver board in bulk stacker.
No
AC power across pins 1 and 3 of
J11 on bulk stacker's power
supply/motor driver board?
Yes
Check 24 V DC and 5 V DC
lines according to Checking the
24 V DC and 5 V DC lines on
next page.
Reset jumper wires (TJ1) and
(TJ2) back to TJ1 and TJ2 on
controller board, respectively.
No
AC power across pins 1 and 5 of
J12?
No
Replace AC harness.
Replace fuse F1.
4-5
Yes
ST-20
4-2-2 Checking the 24 V DC and 5 V DC lines
The following two charts allow checking whether the DC power lines are correctly routed.
(1) Checking the 24 V DC line
24 V DC at the first pin of J1
on bulk stacker's controller
board?
No
24 V DC at the first pin of J1
and J10 on bulk stacker's power
supply/motor driver board?
No
24 V DC at pin 2 of J10 on bulk
stacker's power supply/motor
driver board?
Yes
Fuse F2 on bulk stacker's power
supply/motor driver board
blown?
Yes
Yes
Yes
No
Yes
Replace stacker's contoroller
board.
Replace harness to J1.
Unplug AC power cord.
Measure resistance across pins 1
and 2 of J10. Open and close the
bulk stacker rear cover. If
resistance won't vary, replace
the interlock switch and the
harness. If resistance vary,
replace bulk stacker's power
supply/motor driver board.
Replace power supply/motor
driver board in bulk stacker.
ST-20
Replace fuse F2. If not
corrected, replace power
transformer.
4-6
(2) Checking the 5 V DC line
5 V DC at pin 3 of J1 on bulk
stacker's controller board?
No
5 V DC at pin 3 of J1 on bulk
stacker's power supply/motor
driver board?
No
Is fuse F3 on bulk stacker's
power supply/motor driver
board blown?
Yes
Replace fuse F3. If not
corrected, replace power
transformer.
Yes
Yes
No
Replace bulk stacker's controller
board.
Replace harness to J1.
Replace power supply/motor
driver board in bulk stacker.
4-7
ST-20
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