Konica Minolta DF-724 User Manual
SERVICE MANUAL
Model
DF-724
FEBRUARY 1999
CSM-DF724
KONICA BUSINESS TECHNOLOGIES, INC.
DF-724
SERVICE MANUAL
FEBRUARY 1999
Used on Konica Model
7823
IMPORTANT NOTICE
Because of the possible hazards to an inexperienced
person servicing this equipment, as well as the risk of
damage to the equipment, Konica Business Technologies strongly recommends that all servicing be performed by Konica-trained service technicians only.
Changes may have been made to this equipment to
improve its performance after this service manual was
printed. Accordingly, Konica Business Technologies,
Inc., makes no representations or warranties, either
expressed or implied, that the information contained in
this service manual is complete or accurate. It is understood that the user of this manual must assume all risks
or personal injury and/or damage to the equipment while
servicing the equipment for which this service manual
is intended.
Corporate Publications Department
© 2001, KONICA BUSINESS TECHNOLOGIES, INC.
All rights reserved.
Printed in U.S.A.
CONTENTS
GENERAL, MECHANICAL/ELECTRICAL
1. SPECIFICATIONS ........................................................................................... M-1
2. COMPONENTS IDENTIFICATION .................................................................M-3
3. CROSS-SECTIONAL VIEW ............................................................................M-4
4. DRIVE SYSTEM ..............................................................................................M-5
5. ELECTRICAL COMPONENT LAYOUT ...........................................................M-6
6. DESCRIPTION OF MODES ..................................... ............................ ...........M-7
6-1. Mixed Original Mode ................................................................................M-7
6-2. 1-Sided Original Mode .............................................................................M-7
6-3. 2-Sided Mode ..........................................................................................M-7
6-4. 2-in-1 Mode .............................. .............................. .............. ....................M-7
6-5. S-ADF (Single Feed) Mode .....................................................................M-7
6-6. Thin Mode (As set by “Original Thickness” of User’s Mode) ...................M-7
7. DOCUMENT TAKE-UP/FEEDING MECHANISM ............................................M-8
7-1. Construction ............................................................................................. M-8
7-2. Document Pick-Up Mechanism ............................................................... M-9
7-3. Document Take-Up Mechanism ..............................................................M-10
7-4. Separating Mechanism ............................................ ............................. ...M-11
7-5. Single Feed Mechanism ......................... ............... ............................. .....M-12
8. DOCUMENT TRANSPORT MECHANISM ......................................................M-13
8-1. Construction ............................................................................................. M-13
8-2. Document Transport Mechanism .............................................................M-13
8-3. Original Width Scale Retraction Mechanism ...........................................M-14
9. TURNOVER/EXIT MECHANISM ..................................................................... M-15
9-1. Construction ............................................................................................. M-15
9-2. Turnover/Exit Document Transport Mechanism ......................... .............M-16
9-3. Turnover/Exit Switching Mechanism ........................................................M-17
10. MISCELLANEOUS ..........................................................................................M-18
10-1.Document Size Detection Mechanism .....................................................M-18
10-2.Raised/Lowered Position Detecting Mechanism .....................................M-18
TEST MODES
1. TEST MODES ........ ........................... ............................ ........................... .......S-1
1-1. Paper Passage Check .............................................................................S-2
(1) Flow of Paper Passage Test ...........................................................S-3
(2) LED Status when the Copier is in Standby for
Paper Passage Test ........................................................................S-3
1-2. Unit Check ............................................ ........................... ........................S-4
1-3. Sensor Check ....................................... ............................. ......................S-6
1-4. Sensor Adjustment Check ...................... ............... ............................. .....S-8
DIS/REASSEMBLY, ADJUSTMENT
1. DISASSEMBLY ...............................................................................................D-1
1-1. Removal of the Document Transport Belt ................................................D-1
1-2. Removal of the Document Take-Up Roller Assy ...................... ...............D-2
1-3.Removal of the Document Take-Up and Separator Rollers ....................D-2
1-4. Removal of the Separator Pad ................................................................D-3
iii
1-5. Removal of the Document Take-Up Unit Assy ........................... .............D-4
1-6. Removal of the Turnover/Exit Assy .........................................................D-5
1-7. Removal of the Take-Up Motor/Transport Motor Unit ..............................D-6
2. ADJUSTMENTS ..............................................................................................D-7
2-1. Adjustment of Magnet Height ...................................... ............................D-7
2-2. Adjustment of the Document Feed Table ..... ................. ..........................D-8
2-3. Adjustment of the Single Feed Tray .............................. ................. .........D-9
2-4. Adjustment of Document Stop Position in the 1-Sided Mode ..................D-10
2-5. Adjustment of Document Stop Position in the 2-Sided Mode ..................D-11
2-6. Adjustment of Document Stop Position in the 2-in-1 Mode .....................D-12
2-7. Adjustment of Distance Between Documents in the 2-in-1 Mode ............D-13
2-8. Adjustment of Document Stop Position in the Single Feed Mode ...........D-14
2-9. Adjustment of ADF Registration Loop ............................................ .........D-15
2-10.Adjustment of Document Stopper Solenoid SOL1 ..................... .............D-16
2-11.Adjustment of Document Pressure Solenoid SOL2 ............. .. ..................D-17
2-12.Adjustment of Scale Solenoid SOL3 .............. ................................ .........D-18
2-13.Adjustment of Turnover/Exit Switching Solenoid SOL4 .............. .............D-19
2-14.Adjustment of the Separating Pressure of Document
Separator Pad ..........................................................................................D-20
2-15.Adjustment of the Distance Between Separator Rollers ........... ...............D-21
TROUBLESHOOTING
1. MISFEED DETECTION ...................................... ........................... ..................T-1
2. TROUBLESHOOTING PROCEDURE ...................... ............... ............... .........T-2
iv
SAFETY PRECAUTIONS
SAFETY PRECAUTIONS
Installation Environment
Safety considerations usually are directed toward
machine design and the possibility of human error. In
addition, the environment in which a machine is operated must not be overlooked as a potential safety
hazard.
Most electrical equipment is safe when installed in a
normal environment. However, if the environment is
different from what most people consider to be normal, it is conceivable that the combination of the
machine and the room air could present a hazardous
combination. This is because heat (such as from
fusing units) and electrical arcs (which can occur
inside switches) have the ability to ignite flammable
substances, including air.
When installing a machine, check to see if there
is anything nearby which suggests that a poten-
tial hazard might exist. For example, a laboratory
might use organic compounds which, when they
evaporate, make the room air volatile. Potentially dangerous conditions might be seen or smelled. The
presence of substances such as cleaners, paint thinners, gasoline, alcohol, solvents, explosives, or similar items should be cause for concern.
If conditions such as these exist, take appropriate
action, such as one of the following suggestions.
effect may be caused by altering any aspect of the
machine’s design. Such changes have the potential
of degrading product performance and reducing
safety margins.
For these reasons, installation of any modification not
specifically authorized by Konica Business Machines
U.S.A., Inc., is strictly prohibited.
The following list of prohibited actions is not all-inclusive, but demonstrates the intent of this policy.
• Using an extension cord or any unauthorized
power cord adapter.
• Installing any fuse whose rating and physical size
differs from that originally installed.
• Using wire, paper clips, solder, etc., to replace or
eliminate any fuse (including temperature fuses).
• Removing (except for replacement) any air filter.
• Defeating the operation of relays by any means
(such as wedging paper between contacts).
• Causing the machine to operate in a fashion other
than as it was designed.
• Making any change which might have a chance
of defeating built-in safety features.
• Using any unspecified replacement parts.
• Determine that the environment is controlled
(such as through the use of an exhaust hood) so
that an offending substance or its fumes cannot
reach the machine.
• Remove the offending substance.
• Install the machine in a different location.
The specific remedy will vary from site to site, but the
principles remain the same. To avoid the risk of injury
or damage, be alert for changes in the environment
when performing subsequent service on any machine, and take appropriate action.
Unauthorized Modifications
Konica copiers have gained a reputation for being
reliable products. This has been attained by a combination of outstanding design and a knowledgeable
service force.
The design of the copier is extremely important. It is
the design process that determines tolerances and
safety margins for mechanical, electrical, and electronic aspects. It is not reasonable to expect individuals not involved in product engineering to know what
General Safety Guidelines
This copier has been examined in accordance with
the laws pertaining to various product safety regulations prior to leaving the manufacturing facility to
protect the operators and service personnel from
injury. However, as with any operating device, components will break down through the wear-and-tear of
everyday use, as will additional safety discrepancies
be discovered. For this reason, it is important that the
technician periodically performs safety checks on the
copier to maintain optimum reliability and safety.
The following checks, not all-inclusive, should be
made during each service call:
CAUTION: Avoid injury. Ensure that the copier is
disconnected from its power source before continuing.
• Look for sharp edges, burrs, and damage on all
external covers and copier frame.
• Inspect all cover hinges for wear (loose or broken).
• Inspect cables for wear, frays, or pinched areas.
v
SAFETY PRECAUTIONS
• Ensure that the power cord insulation is not damaged (no exposed electrical conductors).
• Ensure that the power cord is properly mounted
to the frame by cord clamps.
• Check the continuity from the round lug (GND) of
the power cord to the frame of the copier -- ensure
continuity. An improperly grounded machine can
cause an electrically-charged machine frame.
Safeguards During Service Calls
Confirm that all screws, parts, and wiring which are
removed during maintenance are installed in their
original positions.
• When disconnecting connectors, do not pull the
wiring, particularly on AC line wiring and high
voltage parts.
• Do not route the power cord where it is likely to
be stepped on or crushed.
• Carefully remove all toner and dirt adhering to any
electrical units or electrodes.
• After part replacement or repair work, route the
wiring in such a way that it does not contact any
burrs or sharp edges.
• Do not make any adjustments outside of the
specified range.
Applying Isopropyl Alcohol
Care should be exercised when using isopropyl alcohol, due to its flammability. When using alcohol to
clean parts, observe the following precautions:
• Remove power from the equipment.
• Use alcohol in small quantities to avoid spillage
or puddling. Any spillage should be cleaned up
with rags and disposed of properly.
• Be sure that there is adequate ventilation.
• Allow a surface which has been in contact with
alcohol to dry for a few minutes to ensure that the
alcohol has evaporated completely before applying power or installing covers.
Summary
It is the responsibility of every technician to use professional skills when servicing Konica products. There
are no short cuts to high-quality service. Each copier
must be thoroughly inspected with respect to safety
considerations as part of every routine service call.
The operability of the copier, and more importantly,
the safety of those who operate or service the copier,
are directly dependent upon the conscientious effort
of each and every technician.
Remember...when performing service calls, use good
judgement (have a watchful eye) to identify safety
hazards or potential safety hazards that may be present, and correct these problem areas as they are
identified -- the safety of those who operate the copier
as well as those who service the copier depend on it!
vi
GENERAL,
MECHANICAL/
ELECTRICAL
1 SPECIFICATIONS
Name : Duplexing Document Feeder
Type : Paper Take-Up: Take-up from top of stack, U-turn feeding
Installation : Mounted onto the copier
Type of Document : Plain paper
Detectable Document
Sizes
Capacity : Document Feed Table:
Alignment : Aligned along the rear Document Edge Guide
Document Loading : Face up (Single Feed Mode-Face down)
Modes : 1-Sided Original
Power Source : 24 VDC, supplied from the copier
Power Consumption : 60W or less/2.5A
Dimensions : Width 627 mm
Weight : 13.0 kg
Transport: Automatic single-belt transport system
Turnover: Loop turnover system
Ejection: U-turn ejection
1-Sided and Dual Original
Scanning (2-in-1) Modes: 50 to 100 g/m²
2-Sided Mode : 60 to 90 g/m²
Mixed Original Mode : 60 to 90 g/m²
Single Feed Mode : 35 to 200 g/m²
: A3L, B4L, A4LC, B5LC, A5L, 11” × 17”L, 8-1/2” × 14”L,
8-1/2” × 11”LC, 11” × 15”L, 8-1/4” × 13”L
A4 or smaller 50 sheets (of paper weighing 80 g/m²)
B4 or larger 30 sheets (of paper weighing 80 g/m²)
Document Exit Table:
A4 or smaller 50 sheets (of paper weighing 80 g/m²)
B4 or larger 30 sheets (of paper weighing 80 g/m²)
2-Sided Original
2-in-1
Mixed Original
Single Feed Mode
Depth 515 mm
Height 125 mm
The “Original Thickness” function
of User’s Choice permits selection
between the plain paper and thin
paper mode.
M-1
Documents which
cannot be used
Type of Document Possible Trouble
Documents stapled or clipped together Take-up failure, damaged document, defec-
Documents glued together Take-up failure, damaged document
Documents folded, torn, or wrinkled Take-up failure, damaged document
Documents severely curled Documents mis-fed due to being dog-eared
: The following documents, if used in the DF-724, are very
likely to cause trouble.
tive drive train due to jammed staples or
clips.
Documents for which
feeding cannot be
guaranteed
Type of Document Possible Trouble
Slightly curled documents Dog-eared pages, ejection failure
Heat-sensitive paper for facsimile Crease, ejection failure
Coated documents Take-up failure
Documents with uneven surface (letter head
etc.)
Translucent paper Take-up failure, transport failure
Paper just ejected from the ADF Take-up failure, transport failure
Perforated documents (loose leafed etc.) Take-up failure, transport failure
Documents weighing 40 to 50 g/m² Folded leading edge, transport failure
Folded documents Transport failure, distorted image
: The following documents, if used in the DF-724, may or
may not cause trouble.
Take-up failure
M-2
2 COMPONENTS IDENTIFICATION
12
3
4
7
1. Hookup Cord
2. Maintenance Cover
3. Take-Up Cover
4. Single Feed Tray
5. Document Feed Table
5
6
9
6. Turnover Cover Release Switch
7. Turnover Cover
8. Transport Belt
9. Magnet Catches
4486M019AA
8
4486M037AA
M-3
3 CROSS-SECTIONAL VIEW
18 19
13141516
1. Document Detecting Sensor (S1)
2. Document Take-Up Roller
3. Document Separator Roller
4. Registration Sensor
5. Single Feed Transport Roller
6. Manual Feed Take-up Sensor (PWB-D)
7. Single Feed Transport Roll
8. Registration Driven Roller
9. Registration Drive Roller
10. Size Sensor
12 3 456
12
11. Transport Belt Drive Roller
12. Transport Rolls
13. Transport Belt Guide Roller
14. Transport Belt Driven Roller
15. Exit Roller
16. Turnover Roller
17. Turnover/Exit Sensor
18. Turnover/Exit Switching Plate
19. Exit Roll
11 1098717
4486M015AB
M-4
4 DRIVE SYSTEM
Turnover/Exit
Mechanism
Turnover/Exit
Motor (M3)
Take-Up/Transport Mechanism
Take-U p
Motor (M1)
Transport Motor (M2)
Transport Belt Drive Mechanism
4486M038AA
M-5
5 ELECTRICAL COMPONENT LAYOUT
Code Name Code Name
PWB-A
PWB-B
PWB-C
PWB-D
PWB-E
M1
M2
M3
Main Control Board
Registration Sensor
Size Sensor
Manual Feed Take-up Sensor
Turnover/Exit Sensor
Take-Up Motor
Transport Motor
Turnover/Exit Motor
SOL1
SOL2
SOL3
SOL4
S1
S2
S3
MICLK
Document Stopper Solenoid
Document Pressure Solenoid
Scale Solenoid
Turnover/Exit Switching Solenoid
Document Detecting Sensor
Feed Cover Set Switch
Turnover Cover Set Switch
Document Feed Motor Pulse
Sensor
4486M039AA
M-6
6 DESCRIPTION OF MODES
6-1. Mixed Original Mode
•
If the Mixed Orig key on the control panel is pressed when the copier is set in 1- or 2sided mode, or 2-in-1 mode, the copier detects the size of the document each time a document is taken up and fed in. The copier feeds the copy paper of a size selected from
among the available paper sources according to the document size detected.
6-2. 1-Sided Original Mode
•
When in this mode, the copier detects the size of the document which is taken up and fed
in first.
•
The copier therefore needs to determine the size of the copy paper only once based on
the detected document size and the copying setting made on the control panel. This
makes for faster paper feed timing on the part of the copier.
Note:
If a set of documents of varying sizes are used in this mode, image trouble could result
including missing copy image. (The system does not force a misfeed condition.)
6-3. 2-Sided Mode
•
The copier automatically turns over the 2-sided document for a speedy copying operat ion
(copies are made in the order of the first and second pages).
6-4. 2-in-1 Mode
•
When in this mode, the copier positions two different documents on the Original Glass
side-by-side for making a copy of the two documents onto one side of a single sheet of
paper in a single copy run.
•
If this mode is to be used for a set of documents of different widths, the Mixed Orig key
must first be pressed.
6-5. S -ADF (Single Feed) Mode
•
When a single document is placed in the Single Feed T ra y, the ADF automatically takes it
up and feeds it in to let the copier run a single copy cycle.
Note:
The ADF automatically takes up and feeds in documents even when two or more documents are placed on the Single Feed Tr a y; Howe ver, it could result in a double feed or other
faulty condition. Only one document should therefore be loaded.
6-6. Thin Mode (As set by “Original Thickness” of User’s Mode)
•
When in this mode, the ADF transports the document at a low speed and stops it without
letting it hit against the Original Width Scale.
M-7
7 DOCUMENT TAKE-UP/FEEDING MECHANISM
7-1. Construction
4486M001AA
No. Name No. Name
1
Feed Cover Set Sensor (S2)
2
Document Pressure Pad
3
Document Feed Motor Pulse
Sensor (M1CLK)
4
Document Pressure Solenoid
(SOL2)
5
Document Stopper Solenoid
(SOL1)
6
Take-Up Motor (M1)
7
Transport Motor
8
Registration Sensor (PWB-B)
9
Manual Feed Take-up Sensor
(PWB-D)
10
Registration Drive Roller
11
Single Feed Transport Roller
12
Registration Driven Roller
13
Document Separator Roller
14
Document Take-Up Roller
15
Size Sensor (PWB-C)
16
Document Stopper Guide Plate
M-8
7-2. Document Pick-Up Mechanism
4486M021CA
•
The document pick-up mechanism consists of the Document Pressure Pads, Document
Stopper Guide Plate and Document Take-Up Roller.
•
When documents are loaded on the document feed table, they are pressed against the
Document Take-Up Roller by the Document Pressure Pads, then they are taken up by
the Document Take-Up Roller one by one, commencing with the one from the bottom of
the stack.
•
The Document Stopper Guide Plate determines the leading edge position of the documents loaded in the ADF. It is normally in the raised position, and is lowered at the start
of pick-up motion.
SOL1/2 C ontrol
SOL 1 and 2 are energized and de-energized by the signal output from IC3A on PWB-A.
SOL1 IC3A-20 IC3A-21 SOL2 IC3A-16
ON
(Stopper UP)
OFF
(Stopper
DOWN)
HL
LH
ON H
OFF L
M-9
7-3. Document Take-Up Mechanism
4486T02MAA
4486T01MAA
4486T03MAA
4486T02MAA
4486M022CA
•
The document take-up mechanism takes up a document from the bottom of a set of documents loaded on the Single Feed Tray and feeds it up to the registration roller. It is
driven by the Take-Up Motor.
•
The Take-Up motor (M1) rotates the Document Take-Up Roller, Document Separator
Roller and Single Feed Transport Roller via Gears, Pulleys and Timing Belt.
M1 Control
M1 is controlled by the following output signals. M1 speed is detected by the pulse disk
mounted on the motor output shaft and Document Feed Motor Pulse Sensor (M1 CLK). M1
pulses are applied to IC1A-74, and period A is maintained at the same length so that the
motor rotates at a constant speed.
IC3 Forward Backward
Pin 65 (MIL1)
4486T01MAA
Pin 66 (MUL2)
4486T02MAA
Pin 67 (MIHI)
4486T02MAA
Pin 68 (MIL2)
4486T03MAA
M-10
7-4. Separating Mechanism
4486M034CA
4486M023CA
•
Movable Separator Guide Plates are used in the Document Separating Mechanism. The
height of the 1st and 2nd Separator Guide Plates can be adjusted by a lever or scr ews,
respectively.
•
Lowering the Guide Plates can reduce the occurrence of Smudging on the back of documents and smearing of the document image by reducing the number of documents delivered of the Separator Roller.
Note:
Both 1st and 2nd Separator Guide Plates have been set i n the r aised position at the t ime of
shipment from the factory.
•
The Separator Pad is designed to be pressed against the Separator Rollers. This
ensures that documents are transported one by one even if two or more documents are
fed from the Take-Up Roller.
M-11
7-5. Single Feed Mechanism
•
The single feed mechanism is used to copy documents one at a time only.
•
Open the Single Feed Tray and set a document in place. The Manual Feed Take-up Sensor (PWB-D) will detect the document and the Single Feed Transport Roller/Registration
Roller begins to rotate to take up the document automatically even if the Start key is not
pressed.
Take-Up Motor (M1)
Transport Motor (M2)
Manual Feed Take-up
Sensor (PWB-D)
Single Feed Transport RollerRegistration Drive Roller
M-12
4486M006AB
8 DOCUMENT TRANSPORT MECHANISM
8-1. Construction
4486M025CA
8-2. Document Transport Mechanism
•
The document transport mechanism transport the document, which has been fed up to
the Registration Roller from the document take-up mechanism, up to the Original Width
Scale by means of the Document T r ansport Belt.
•
During the turnover motion, the Document Transport Belt is turned to transport the document toward the take-up end.
M2 Control
Whether M2 is turned forward or backward is determined by the combination of the following signals output from IC4 on PWB-A.
IC4
Pin 2 H H L L
Pin 3 L L H H
Pin 6 L H H L
Pin 7 H L L H
Forward Rotation
Backward Rotation
Step 1 Step 2 Step 3 Step 4
Procedure
M-13
8-3. Original Width Scale Retraction Mechanism
•
When the document is positioned on the Original Glass by the ADF, the leading edge of
the document is pressed against the Original Width Scale to improve positioning accuracy. During turnover and ejection motion, however, the document must move over the
Original Width Scale. For this reason, the Original Width Scale retraction mechanism is
employed.
•
Scale Solenoid SOL3 is used to drive the retraction mechanism.
<Operation>
When the document is positioned : SOL3 is de-energized and the Original Width
Scale is raised by the tension of the Original
Width Scale Spring.
While the document is being transported and during a copy cycle
: SOL3 is energized and the Original Width
Scale is pressed downward by the Original
Width Scale Drive Lever and spring.
4486M026CA
4486D030AA
4486M027CA
4486D032AA
SOL3 Control
The SOL3 is energized and de-energized by the signal output from IC3A on PWB-A.
SOL3 IC3A-14
ON H
OFF L
M-14
9 TURNOVER/EXIT MECHANISM
9-1. Construction
4486M028CA
M-15
9-2. Turnover/Exit Document Transport Mechanism
4486M030CA
•
The turnover/exit document transport mechanism turns over and ejects the document
which has been transported by the document transport mechanism. It is driven by the
Turnover/ Exit Motor (M3).
•
M3 turns both the Turnover Roller and Exit Roller. These rollers are turned in the same
direction regardless of whether a document is turned over or ejected from the ADF.
M3 Control
Whether M3 is turned forward or backward is determined by the combination of the following signals output from IC13 or PWB-A.
IC13
Pin 2 HHHLLLLL
Pin 3 LLLLHHHL
Pin 6 L L H H H L L L
Pin 7 HLLLLLHH
Forward Rotation
Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8
Procedure
M-16
9-3. Turnover/Exit Switching Mechanism
•
The turnover/exit switching mechanism uses the Turnover/Exit Switching Plate which is
swung downward or upward to change the document path, thereby allowing the document to be turned over or ejected from the ADF. This plate is actuated by the Turnover/
Exit Switching Solenoid (SOL4).
4486M031CA
SOL4 Control
The SOL4 is energized and de-energized by the signal output from IC3A on PWB-A.
SOL4 IC3A-17
ON H
OFF L
4486M032CA
M-17
10 MISCELLANEOUS
10-1. Document Size Detection Mechanism
1. Width Detection
•
The width of the document is detected by the sensor located on the Size Sensor
(PWB-C).
•
The sensor is turned ON and OFF by actuator located at points approx. 268 mm respectively, from the Rear Document Guide.
2. Length Detection
•
The length of the document is detected by the number of pulses generated by the Transport Motor (M2) for the period in which the Registration Roller starts turning and the trailing edge of the document passes the Registration Sensor (PWB-B).
10-2. Raised/Lowered Position Detecting Mechanism
•
DF Set Switch is located at the front left corner of the copier and a magnet catch is
mounted on the front left of the ADF. The position of the ADF, whether raised or lowered,
can be detected as the reed switch is turned ON and OFF by the magnet catch.
•
Opening/closing the ADF serves to reset a misfeed condition and allows selection of a
Test Mode operation.
M-18
4486M033CA
TEST MODES
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