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General Repair Manual and Parts List for STAPLEX® Model SJM-1N

Series Electric Staplers with “pop-out” loading

Note:  Always unplug machine before servicing or attempting repairs.

            Keep fingers, hair, jewelry, etc. away from moving  parts.

            Remove all staples before working on machine.

Diagrams of JM-22N Stapling Head for Model SJM-1N

Use LOW setting when stapling the equivalent of just a few  sheets of 20# bond paper to reduce wear on parts.

 Use STAPLEX Type DS High Speed Staples for best results and  to avoid jamming and damage to stapling mechanism.

If machine becomes sluggish, the Solenoid Coil may be overheated.  Use a backup machine for the rest of the shift.

Avoid using long/thin extension cords, which may reduce voltage to the electrical components.

 Never activate the Solenoid Coil without the plunger and stapling head in place, for safety and to avoid burning out the coil. 

The Rubber Bumper [#JM-N-134 Fig.5] on the bottom brass part of the Solenoid Plunger [#JM-N-133] must slide on Top Plate [#JM-N-17 Fig.2] on a coating of grease. (See 1A below)


Table of Contents

1) To remove Stapling Head: Section IIC

2) To perform routine lubrication: Section I

3) To replace Shoulder Screw: Section III

4) Weak power to Solenoid and Plunger:  Section IV

5) Electrical Diagnosis: Section V




A)     Remove Front Cover [#JM-N-12 Fig. 1D] by removing the 4 front Cover Screws [#316A Figs.JM-N-1A & JM-N-1C].  Observe if the Plunger Bottom Bumper [#JM-N-134 Fig.5] is riding on a film of grease over the Stapling Head Top Plate [#JM-N-17 Fig.2 Grease Point A] by pushing down on Upper Door [#JM-N-21] while holding up Bumper [#JM-N-134].  The bumper should be firmly held onto Plunger [#JM-N-133].  If Brass Screw [#JM-N-315 Fig.5] is showing or plunger rubber bumper is worn, replace the bumper.  Add a generous coating of any medium grease on Top Plate [#JM-N-17 ]with extra grease applied to Bumper [#JM-N-134] in the recess.  You cannot over-grease.

B)  At this time, pop out Staple Track and grease behind Door [#JM-N-220 grease point B, Fig.2]. If stapling head is already out of the housing, check Grease Point C at Z-shaped Door Lock Bracket [#JM-N- 226]  bottom.  Otherwise, this lubrication can be deferred until head is serviced.

C)  Lubricate with some grease and a few drops of oil the entire area above and around the Driver Blade [#JM-N-25] and Drive Bar [#JM-N-36] shown in Figures 3 and 4. Drive Bar[#JM-N-36] is behind Driver Blade [#JM-N-25] and the oil should be dropped down all around the Bar and Blade.


A)   First check that the three Bottom Stapler Head Mounting Screws [#JM-N-308 Fig.lB] are not over-tightened.  You will notice that turning the front screw raises and lowers the Clincher Die [#JM-N-32 Fig.2] which also changes the alignment.  Find a “sweetspot” setting for the Clincher Die for the type of jobs you run.  This works in 95% of all cases.  To prevent the screw from rotating you can coat the threads with a medium strength threadlock glue before tightening.


B)  Further alignment can be made by moving the entire Midsection (Fig.2) position relative to the Clincher Die.

This will correct left to right lateral play and bring the Driver Blade directly in the center of the Clincher Die.

First remove Stapling Head as follows in C below. 

C)  Remove Front Cover (see Section IA above).  Then remove Stapling Head (Fig.2) by removing the three screws [#JM-N-308 Fig.lB].  Loosen the Contact Adjusting Knob [#JM-N-15 Fig.1] and tilt the Contact Frame [#JM-N-232 Fig.3] so Microswitch Lever is horizontal.  This way it will not drag on the Head as you pull the Head out.  Hold onto the Plunger [#JM-N-133 Fig.5] while sliding the Head out.  Open the door to remove staples by depressing Lock [#JM-N-226 Fig.2]. Check again by closing Door and depressing Top Plate [#JM-N-17 Fig.2]. All staples should now be ejected.

 D)  Check Clincher Die alignment precisely.  Place a screwdriver blade behind Clincher Die [#JM-N-32 Fig.2] to act as a wedge.  Push down on Top Plate [#JM-N-17].  The Driver Blade [#JM-N-25] should be centered: equidistant left to right and front to back in the Clincher Die.  If there is too much lateral play (Midsection [# JM-N-23] wobbles left and right badly enough that the driver blade touches either the left or right edge of Clincher Die, swing open the Midsection [#JM-N-23 ] and tighten a vice grip over both left and right Rail Supports [#JM-N-224]. (Right Rail is visible in Fig.2). Squeeze gradually.  Test by returning Midsection to closed position.  Stapling Head  should not have play, but bounce back freely.  If over-tightened, you may open up left or right rail with a long nose plier until Driver Blade is centered.

 E)  If the above adjustments do not help to center the Driver Blade, it may be necessary to reset the Rail Supports [#JM-N-224]. Lift up Midsection [#JM-N-23 Fig.2].  Gradually loosen the  6 Base Rail Support Screws [#JM-N-305] only enough so the Left and Right Rail Supports move when tapped with a hammer and screwdriver edge.  Flip back the Midsection and check until Driver Blade is centered in Clincher Die as described above in Section D. Retighten the six screws. Make fine tune adjustment by squeezing with a vice-grip as described above in D.


If Shoulder Screw [#JM-N-19 Fig.4] has sheared off and cannot be removed with a screwdriver, remove it with a vice-grip.  If it has cracked inside Drive Bar [#JM-N-36], access the Drive Bar by removing Top Plate Screw [#JM-N-120 Fig.2]. Lift out the Drive Bar and insert a new Drive Bar into Upper Door with Oval [#JM-N-21].  Be sure the side with the counterbored hole is facing front.  With Plunger Spring [#JM-N-28 Fig.3] in place, screw down the Top Plate.  Line up counter-bored threaded hole in drive bar with hole in Driver Blade and screw in a Shoulder Screw.  A small amount of temporary threadlock glue is recommended but not necessary.


 A)  If reduced power is a problem, before checking electrical systems (described in the next section), check that the Plunger Top Bumper [#JM-N-138] is attached to Bracket [#JM-N-137 Fig.5], and that no foreign matter is wedged between Solenoid Coil [#JM-N-132] and Plunger [#JM-N-133].


B)  If staples are not clinching properly, there may be loose staples lodged under Elevating Spring [#JM-N-150 Fig. 2]. This will prevent the full downward motion of the Stapling Head because the elevating spring will be too stiff.  Swing open the Midsection and remove loose staples with a pair of tweezers.




The following Components List and Wiring Schedule are provided for use of KNOWLEDGEABLE service personnel for troubleshooting.  Always unplug machine from outlet when working on machine.  Do NOT activate machine UNLESS BOTH the Solenoid Plunger and Stapling Head are in place for safety, and to prevent damage to the Solenoid Coil.

Electrical Components


Solid State Electronic Module

Hi/Off/Low Rocker Switch

3-wire conductor cord set assembly

Solenoid Coil

Main Line Fuse

In-line microfuses for wire leads of the Solenoid Coil


A)  The MICROSWITCH [#JM-N-130] wire leads are color-coded

Yellow              (Common)

Green               (Normally Open)

Blue                  (Normally Closed)


Unplug machine and check continuity with a Volt/Ohm Meter (VOM).  If Microswitch gives erratic readings or none at all, replace Microswitch.


B)  The SOLID STATE ELECTRONIC MODULE [#JM-N-135] is numerically coded according to the scheme which follows.  It cannot be tested with a meter.  To check, put machine completely together and test by stapling pages normally.


                                      El – GREEN    : to Green Microswitch wire

                                      E2 – YELLOW : to Yellow Microswitch wire

                                      E3 – BLUE      : to Blue Microswitch wire

                                      E4 – RED         : to middle position of Hi/Off/Low Switch

                                      E5 – BLACK   : to main line Fuse Holder.

                                                                (The other side of Fuse Holder is connected to Black Cordset Wire.)

                                      E6 – WHITE    : to White Cordset wire, joined together with the White Solenoid Coil wire.

 C) SOLENOID COIL [#JM-N-132 Fig.5]

VOM Resistance testing is done without power, therefore, unplug machine.  Later, when repairs to Solenoid Coil are complete and power test is run, do NOT activate Solenoid Coil UNLESS BOTH the plunger and Stapling Head are in place for safety, and to prevent damage to the Solenoid Coil.

NOTE:    The BLUE Solenoid Coil wire lead is the LOW lead but is wired to the Top Position stamped “1” on the Rocker Switch.  This is due to the internal mechanics of double throw switches.

NOTE:    The GREEN Solenoid Coil wire lead is the HI lead but is wired to the Bottom Position stamped “3” on the Rocker Switch.  This is due to the internal mechanics of double throw switches.

NOTE:    The WHITE Solenoid Coil wire lead is the Common lead and is joined with the White Cordset wire.  Together they are connected to the Solid State Electronic Module tab marked E6.

If you wish to verify the Solenoid Coil readings, conduct a VOM test without power.  You will need a very accurate, calibrated VOM.  The reading across the White and Blue leads is approximately 7.4 Ohms; and across the White and Green Leads is approximately 4.2 ohms.

This concludes the basic repair manual for SJM-1N series staplers.  If you have any questions, please contact Staplex at 1-800/221-0822 (718-768-3333 in NYS or outside USA), Fax inquiries to 718/965-0750, or E-mail to



JM-N-11 Housing (Steel) Main frame clamshell

JM-N-12 Front cover with Staplex logo and top grill

JM-N-13  Rear cover with push rod hole

JM-N-14A Round toggle On/Off/Low Switch

JM-N-14B Rectangular On/Off/Low Rocker Switch

JM-N-15    Adjusting Knob

JM-N-17     Drive Bar Top Plate

JM-N-18     Rubber Suction Foot

JM-N-19     Shoulder Screw

JM-N-21     Upper Door with oval, inverted gull wing design, and four (4) through holes for #5-40 screws

JM-N-22                 Stapling Head complete with base

JM-N-23                 Stapling Head Midsection (no base)

JM-N-25                 Driver Blade

JM-N-26 Top Plate Spacer Bumpers (set of 2)

JM-N-27                 Bottom Drive Bar Impact Bumpers (set of 2)

JM-N-28 Plunger Spring

JM-N-30                 Stapling Head Base with clincher die and satin cover

JM-N-32                 Clincher die (anvil with two wells)

JM-N-34 Lower rail support screws (6 total)

JM-N-36                 Drive Bar

JM-N-47A Movable Contact Assembly Microswitch with frame

JM-N-89A Fuse Holder Assembly complete with cover cap

JM-N-89CO           Fuse Holder cover cap only

JM-N-120               Drive Bar Screw (a/k/a JM-N-311)

JM-N-121               Upper Door Screws (set of 4) a/k/a JM-N-304

JM-N-122               Left side screws,(set of 2) for side pull doors, a/k/a JM-N-309

JM-N-123               Left and Right side screws (set of 4) for Top Pull doors;

                                Right side of side pull doors (set of 2), a/k/a JM-N-302

JM-N-124               Feed Spring

JM-N-130C            Microswitch with color wire leads and quick connects

JM-N-130H            Microswitch Harness only

JM-N-130CH         Microswitch plus Harness (JM-N-130C plus JM-N-130CH)

JM-N-132               Solenoid Coil

JM-N-133               Solenoid Coil

JM-N-134               Solenoid Plunger Bottom Bumper

JM-N-135               Electronic Control Module

JM-N-136               Solenoid Coil Bracket

JM-N-137               Solenoid Plunger Stop Bracket

JM-N-138               Solenoid Plunger Top Bumper

JM-N-139               Blue Microfuse with leads (Low coil)

JM-N-140               Green Microfuse with leads (Hi coil)

                JM-N-150               Elevating Spring

                JM-N-151               Wire Cable Tywrap

                JM-N-152               Wire Holder with screw hole

                JM-N-219               Solenoid Coil and Mounting Bracket Assembly

JM-N-220               Lower Door with pull (specify top or side pull)

JM-N-221               Drive Bar Inner Guide Rail with four (4) #5-40 tapped holes

JM-N-222               Drive Bar Outer Guide Rail with four (4) 0.125” holes

JM-N-223               Base 90 degree Left Rail Support with slot

JM-N-224               Base 90 degree Right Rail Support

JM-N-225               Lock Holddown Twin Peaks with oval adjustment slot

JM-N-226               Door Lock : Offset Adjusting Bracket Z-shape with two (2) #4-40 tapped

                                                holes and one (1)  #.062 hole for spring

JM-N-22 7              Staple Guide Pusher Stop U-shape with 90 deg bend top flag

                                                and two (2)  0.113” thru holes

JM-N-228               Pusher

JM-N-229               Feed Spring Retaining D-Clip

JM-N-230               Staple Guide Frame six #4-40 tap holes, 2# .JM-N-102 thru

JM-N-231               Main Housing Frame with JM-N-18 holes

JM-N-232               Contact Frame with adjusting knob screw

JM-N-233               Push Rod Bracket

JM-N-234               Inner spring-loaded self-clear Core with two (2) bends, two (2)  shears and one (1) tapped 4-40 hole for pusher stop

JM-N-235               Outer sliding Staple Guide Core with two (2 ) bends, 2 shears, and 2 4-40 tapped holes

JM-N-236               Decorative Satin Finish Base Cover

JM-N-237               Stapling Head Base Plate- No clincher, no satin cover

JM-N-238               Clincher Die (anvil) Mounting Plate

JM-N-239               Lock Pivot

JM-N-240               Base Pivot Screw

JM-N-241               Feed Spr4ng Roller

JM-N-242               Feed Spring Roll Pin

JM-N-243               Steel Push Rod (for pop-out loading)

JM-N-244               Soft-touch cap for pop-out loading rod above

JM-N-245               Thread lock glue, temporary type



JM-N-300                  Microswitch Screws, 2 per set

JM-N-301                  Clincher Die Screws, 2 per set

JM-N-302                  Outer Guide Screws, 6 per set

                                   Door Lock Screws, 2 per set

                                   Elevating Spring Screw, 1 each

                                   Pusher Stop Screw, 1 each

                                   Door Screws:

                                                   for Top-Pull doors use 4 total: 2 on left side and 2 on right side

                                                   for Side-Pull doors use 2 on right side

                                                   (see P/N JM-N-309 below for left side

JM-N-303                  Underside Stapling Head Base Front Screws (secures satin cover to base)

JM-N-304                  Upper Door Screws, 4  per set

JM-N-305                  Lower Rail Support Screws, 6 per set (3 right, 3 left side)

JM-N-307                  Solenoid Bracket Screws, 4 per set

JM-N-308                  Bottom Stapler Head Mounting Screws

JM-N-309                  Left Side "Side Pull" Door Screws, 2 per set

JM-N-311                  Drive Bar Top Screw, 1 each

JM-N-312                  Contact Frame Screw, 1 each

JM-N-313                  Impact Attenuator Screw, 1 each

JM-N-314                  Special Longer Clincher Die Screws for Clam Shell and other raised applications.

JM-N-315                  Special Brass Plunger Bumper Screw, l each

JM-N-316A               Front Cover Screws, 4 per set

JM-N-316B               Rear Cover Screws, 4  per set

JM-N-317                  Special Torx Screws for tamper-proof mounted items


Patented and patents pending.  Specifications and availability subject to change without notice or obligation.

Staplex is a registered trademark of The Staplex Company.

© 2001 The Staplex Company, Inc., Brooklyn, New York 11232-1695 USA                                                             


SJM-1N Rev. 4/26/01