Table of Contents
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Contents
About the Janome QMP16SU ............................................................................................................. 2
About This Manual ..................................................................................................................................... 2
Service Manual Guidelines..................................................................................................................... 2
1. General Specifications .................................................................................................................... 4
Assembly Torque Specifications ................................................................................................................. 5
3. Preparing to Service ........................................................................................................................ 6
Electrostatic Discharge (ESD) Precautions.............................................................................................. 6
Remove the Front Cover, Control board, and Power Supply .................................................................. 7
Reassemble the Machine Following Service .......................................................................................... 9
Control Board Connections .................................................................................................................. 10
Main Shaft Encoder, Motor Driver Board, and Motor Connections .....................................................11
QMP16Su Cables...................................................................................................................................12
4. Lubrication ................................................................................................................................... 16
5. General Checks and Adjustments .................................................................................................. 19
Thread Mast ......................................................................................................................................... 20
Hand Wheel ......................................................................................................................................... 20
Thread Guides ...................................................................................................................................... 20
Top Tension Assembly .......................................................................................................................... 21
Check and Secure Flats and Screws..................................................................................................... 24
Brass Counterweight Timing.................................................................................................................26
Check and Adjust Axial Play ................................................................................................................. 27
Check the Base-Plate Wheels............................................................................................................... 29
Check Motor Drive/Timing Belt Tension .............................................................................................. 30
Adjusting the Hopping Foot Adapter ................................................................................................... 32
Adjusting the Presser Bar Height (Internal Adjustment) ...................................................................... 33
Needle Position, Check, and Adjustment ............................................................................................. 34
6. Timing Adjustments ...................................................................................................................... 36
Visual Timing Check..............................................................................................................................36
Loop Lift and Needle distance Adjustment .......................................................................................... 39
Adjusting the Needle Height ................................................................................................................ 44
Stop-Finger Adjustment ....................................................................................................................... 46
Adjusting the Needle Height with Cylinder Tool .................................................................................. 47
7. Machine Electronics ...................................................................................................................... 50
Speed/Needle Position Sensor..............................................................................................................50
Indications of Speed/Needle Position Sensor Failure ......................................................................... .51
Fuse and Power Supply ........................................................................................................................ 52
LED Identification ................................................................................................................................. 54
Control Pod Power LED ........................................................................................................................ 55
Display Communications LEDs ............................................................................................................. 56
LED Light Ring Information .................................................................................................................. 57
Round Tooth (RT) Belt .......................................................................................................................... 58
Electrical Notes Janome QMP16SU ..................................................................................................... 59
8. Janome QMP16SU Screens ...................................................................................................... .62
Diagnostics............................................................................................................................................63
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QMP16SU Service Manual
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Summary of Contents for Janome QMP16SU
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Page 1: Table Of Contents
Contents About the Janome QMP16SU ......................2 About This Manual ............................. 2 Service Manual Guidelines........................2 1. General Specifications ........................4 Assembly Torque Specifications ......................... 5 3. Preparing to Service ........................6 Electrostatic Discharge (ESD) Precautions....................6 Remove the Front Cover, Control board, and Power Supply ..............7 Reassemble the Machine Following Service .................. -
Page 2: About The Janome Qmp16Su
The Janome QMP16SU machine is constructed following a specific sequence of operations, similar to the construction of a house. Walls cannot be erected until the foundation is in place. Similarly, this service manual has been written with an adjustment logic that is driven by the construction processes used to create the machine. - Page 3 • Note that the hand wheel must always be turned in the direction of normal rotation unless otherwise instructed. This is especially true when making the loop-lift timing and needle-height adjustment (Exceptions are when removing thread locks or testing belt tension. The hand wheel may be rocked forward and reverse in these cases.) QMP16SU Service Manual...
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Page 4: General Specifications
100 – 250 VAC, 47-63Hz, 600W peak * Complies with international certifications Sew Foot Stroke/Lift 5 mm Needle Bar Stroke 35.3 mm Take-Up Stroke 73 mm Lubrication, main components Kluber Lube, permanent Lubrication of hook Velocite 10, Texaco 22 www.Janome.com... -
Page 5: Assembly Torque Specifications
It is therefore advised that this torque specification not exceed 6 Nm. • Base plates 6. 6 mm Allen set screw, Class 8.8@ 4.5 Nm (Uses a 3 mm Allen tool) • Hand wheel QMP16SU Service Manual... -
Page 6: Preparing To Service
3. Preparing to Service Electrostatic Discharge (ESD) Precaution Servicing the machine exposes the control electronics of the Janome machine. Take care to avoid handling the open electronics as much as possible. To minimize the risk of damage to the electronics due to ESD, we recommend that you use an electrostatic discharge mat and wrist strap. -
Page 7: Remove The Front Cover, Control Board, And Power Supply
1. Lift the machine and carefully lay it on its side while taking care to not put pressure on or bend the machine encoder. 2. Loosen or remove the three screws on the bottom power plate from the front cover. QMP16SU Service Manual... - Page 8 U CAUTION: The take-up lever is very hard and will break, not bend. Note: If necessary loosen or remove the needle plate screws to remove the front cover. www.Janome.com...
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Page 9: Reassemble The Machine Following Service
 IMPORTANT: If a regular short handled L-hex tool is used it will not flex. NOTE: If the screws are too loose, the frame will not properly hold its adjustments. However, do not over tighten the screws or the tapped hole may strip out or the screw may break. QMP16SU Service Manual... -
Page 10: Control Board Connections
C: Control Board to Main Shaft Encoder connection; J8 (4 pin) D: Control Board to Motor Driver connection; J13 (8 pin) E & F: Handlebar connections; J17 and J18 (10 pin) G: LED ring connection; J3 (2 pin) 10 | www.Janome.com... -
Page 11: Main Shaft Encoder, Motor Driver Board, And Motor Connections
Motor driver board control cable from control board connection “D” to motor driver board. (5 wires in an 8 pin connector) Motor Driver Board connections from motor. Motor driver board connections from motor - enlarged | 11 QMP16SU Service Manual... -
Page 12: Qmp16Su Cables
QMP16SU CABLES 1. QM20006 CABLE-USBA-RA TO MIB-RA 8” (front handle bar connection cable) 2. QM20013 CABLE-USB A F TO 5X2 HDR E 25M (internal long fhb connection cable) 3. QM20013-01 CABLE-USB A F TO 5X2 HDR F 25M (internal short rhb connection cable) 4. - Page 13 - inside the front cover. 6. QM20204 CABLE-POWER SWITCH SW. Jumps the power supply switch on the power supply, the machine will not power up without this jumper. | 13 QMP16SU Service Manual...
- Page 14 QMP16SU CABLES 7. QM20795 CABLE-TERMINATOR 18 (SR CABLE) Connects the machine to the X and Y encoders for Stitch Regulation 8. QM21852 CABLE-GND SIGNAL-EARTH 24 Ground cable for power supply and power plate. 9. QM21868 CABLE-CPOD TO DRIVER 18E Control board to motor driver board communication cable.
- Page 15 QMP16SU CABLES 11. QM22463 CABLE-ENCODER DISK 18/24 Main shaft encoder cable for needle stop up/down position. | 15 QMP16SU Service Manual...
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Page 16: Lubrication
#1-#6 Kit QM49262 Janome QMP16SU Lubricating Schedule The Janome QMP16SU should be lubricated every one to two years to ensure top mechanical performance. Routine Oiling of the Race The quilter should apply one drop of oil from the EZ Oiler they received with their machine (Lube #6 [Purple]), to the raceway of the bobbin case with each bobbin change. - Page 17 Where to Lubricate the Janome QMP16SU machine 1. After removing the front cover, lubricate with Lube #1 (Red) between the bearing and the shaft on both sides of the bearing and replenish as needed with Lube #2 (Blue) between bearing outer diameter and the bearing support at the six places shown.
- Page 18 Add a small amount between the stylus and cams of both driver the presser-bar lifting link and the hopping-mechanism (3 places) lifting arm. 4 places) orifice located a little behind the top radius 1 Two more lower head frame bearings not shown 18 | www.Janome.com...
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Page 19: General Checks And Adjustments
Three-Hole Thread Guide B Thread Guide C Top Thread Tension Assembly Stirrup Thread Guide D Take-Up Lever Thread Guide E Needlebar Thread Guide F Front Casting/Frame Ruler Base Post Side Laser Stylus Post Hole Hand Wheel | 19 QMP16SU Service Manual... -
Page 20: Thread Mast
3. Position the hand wheel and tighten the set screw. Thread Guides See Janome QMP16SU Front Side View, page 19 item numbers 3, 4, 5, 7, 9, and 10. Check Test the condition of the six thread guides and thread stirrup for any abrasions, cuts, or electroplating blistering. -
Page 21: Top Tension Assembly
Top Tension Assembly See Janome QMP16SU Front Side View, item number 6. Check #1 Check between the tension discs for any foreign material, wear or damage that could prevent the discs from functioning properly. Adjust if necessary Tool: 2 mm and 2.5 mm hex wrench 1. - Page 22 7. Place the tension assembly into the machine front cover and tighten the set screw. Â IMPORTANT: When the top tension assembly is properly installed, the straight part of the take-up spring (before the loop) will be straight up at 12 o’clock (or slightly towards 11 o’clock). 22 | www.Janome.com...
- Page 23 2. Adjust the split bolt by spreading with a flat screwdriver until the knob has adequate resistance to keep its setting. U CAUTION: The split bolt is hardened and it may break if adjusted too much. If it breaks, replace the top tension assembly (part number QM10199). | 23 QMP16SU Service Manual...
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Page 24: Check And Secure Flats And Screws
Check and Secure Flats and Screws The Janome QMP16SU uses flats and special screws to help prevent loop lift timing from slipping, except at the hook. (If the hook cannot slip then something has to break when something goes wrong. The hook is designed to be adjusted without removing the front cover.) - Page 25 Important Hook-Shaft Notes The hook-shaft turns two times per stitch and rotates in the opposite direction from the main shaft. Carefully note which screw is the first screw in the direction of motion and on the flat. | 25 QMP16SU Service Manual...
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Page 26: Brass Counterweight Timing
Check #6: Brass Counter Weight Position Timing The Janome QMP16SU utilizes a counter weight for improved balance throughout its speed spectrum. The counterweight has two functions. It acts as a collar to remove axial play and as a counterbalance to minimize up an down (hopping) movement in the machine. -
Page 27: Check And Adjust Axial Play
NOTE: Any axial play from front to back on the hook shaft, affects the needle distance adjustment of the hook timing and will make it impossible to time the machine accurately. | 27 QMP16SU Service Manual... - Page 28 The Janome QMP16SU utilizes long collars with two screws in line to help prevent the collar from tipping when tightened, causing variation of tightness or play, as the collar rotates 360º. To ensure that there is no tightness or play, the collar should be checked through a full rotation until it has minimal tightness and minimal play.
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Page 29: Check The Base-Plate Wheels
Use a 6mm hex tool to loosen the baseplate screws | 29 QMP16SU Service Manual... -
Page 30: Check Motor Drive/Timing Belt Tension
Check Motor Drive/Timing-Belt Tension The Janome QMP16SU machine utilizes a single motor drive/round tooth timing belt system. Check 1. Remove the front cover. 2. Check the belt tension for tautness by pressing it with the index finger. 3. Press the vertical center of the belt with approximately 2 pounds of pressure. - Page 31 Timing Belt Tensioner  IMPORTANT: Ensure that the special washer with step is down into the tensioner bracket slot and flat, not a loose belt. tilted, when tightened. This ensures the tensioner will not slip, resulting in | 31 QMP16SU Service Manual...
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Page 32: Adjusting The Hopping Foot Adapter
Adjusting the Hopping Foot Adapter The Janome QMP16SU features the “KinetiQuilt” hopping mechanism, enabling the hopping foot to move (hop) up and down, and dwell on the fabric when the needle is in the fabric. This enables fabric to move through the machine similar to a sewing machine with feed dogs. The dwell time provides a longer hesitation of the hopping foot on the fabric and completion of the stitch cycle. -
Page 33: Adjusting The Presser Bar Height (Internal Adjustment)
This ensures that the hopping-block mechanism contacts the appropriate lifting lever and Screw C eccentric. 6. Confirm the ring of the foot is centered on the needle when the screw is tightened. Shown with front cover off | 33 QMP16SU Service Manual... -
Page 34: Needle Position, Check, And Adjustment
5. Tighten screws A and B. NOTE: If needle position changes, repeat the process, but without tightening screws D or G again. 34 | www.Janome.com... - Page 35 NOTE: If the needle changes, repeat the process. 6. Repeat the process on the left side of the head frame. NOTE: If the needle changes, repeat the process. NOTE: The picture shows the cover off for illustration purposes only. | 35 QMP16SU Service Manual...
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Page 36: Timing Adjustments
7. Check the needle plate for needle impact marks and damage. Replace or repair the needle plate as needed. 8. Put the needle at its bottom dead center (BDC), or its lowest position. The hook point should look like this: 36 | www.Janome.com... - Page 37 NOTE: In this case, there is a very slight gap between the hook point and the needle scarf. The hook point should lightly touch the inside of the needle scarf, in other words it should have no gap. | 37 QMP16SU Service Manual...
- Page 38 If the setting is off it is usually due to someone changing it and throwing it off. Even if the needle hits a ruler or the needle plate, it rarely slips because the needle will break before the needle height part of timing slips. 38 | www.Janome.com...
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Page 39: Loop Lift And Needle Distance Adjustment
7. Rotate the hand wheel in the direction of motion, until the clamp lightly touches the gauging surface. (second image at right). Â IMPORTANT: If the hand wheel is turned too hard, the clamp may slip, making the check invalid. | 39 QMP16SU Service Manual... - Page 40 It is important that the basket needle guard be rotated down out of the way to allow correct adjustment of the needle Stop-finger engaged as seen from front distance setting. Stop-finger engaged as seen from above 40 | www.Janome.com...
- Page 41 5. Adjust needle distance (and loop lift) as di rected in the next section. | 41 QMP16SU Service Manual...
- Page 42 8. Lightly tighten the first screw with the 2 mm ball end L hex tool, while providing resistance against the adjustment, by holding the hook in place with your other hand. Carefully rotate the hook on the hook- shaft to set the loop lift. Carefully snug and then tighten the first screw. 42 | www.Janome.com...
- Page 43 Hook screws without front cover  IMPORTANT: If loop lift, needle distance and needle height are not adjusted accurately, the machine may skip stitches, shred thread or not sew. | 43 QMP16SU Service Manual...
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Page 44: Adjusting The Needle Height
3. Loosen the screw slightly so that the needle bar can be wiggled up or down to the correct position. 44 | www.Janome.com... - Page 45 If this happens, do not run the machine. Remove the front frame cover, reassemble the needle bar to the needle bar driver and readjust. Front cover off to illustrate the needle bar driver screw. | 45 QMP16SU Service Manual...
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Page 46: Stop-Finger Adjustment
NOTE: The machined edge helps support the stop-finger from twisting to the side, allowing the basket to spin out Shown from underside, looking up of position, be hit by the needle and damaged. 2. Tighten screw A. 46 | www.Janome.com... -
Page 47: Adjusting The Needle Height With Cylinder Tool
When the needle bar is at its lowest position, the eye of the needle must align exactly to the groove as shown at the right. | 47 QMP16SU Service Manual... - Page 48 1. Install the cylinder tool with the flat side up. 2. Rotate the cylinder tool so that the flat side is down. 3. Bring the needle to the lowest point by rotating the hand wheel 4. Slide the cylinder tool gently out against the needle. 48 | www.Janome.com...
- Page 49 6. Reinstall the hook and set loop lift at 2.2 mm and reset needle distance. (For more information, see Loop Lift and Needle Distance Adjustment earlier in this section.) | 49 QMP16SU Service Manual...
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Page 50: Machine Electronics
Damage to the encoder disk or any build-up of dust, oil or other material can impede the transfer of light through the transparent portion of the disk and cause the encoder to miss some pulses. 50 | www.Janome.com... -
Page 51: Indications Of Speed/Needle Position Sensor Failure
Check that the cable from the Control board is plugged firmly into the sensor. Needle/Speed Sensor Board | 51 QMP16SU Service Manual... -
Page 52: Fuse And Power Supply
U CAUTION: First unplug the machine from the power source. 52 | www.Janome.com... -
Page 53: Power Supply "Chirping
2. Any other pinching or damage to the yellow/black wires that deliver power to or from the top of the control board. | 53 QMP16SU Service Manual... -
Page 54: Led Identification
LED Identification When you first power on the Janome QMP16SU, each of the LEDs on the control board LED bank will briefly flash in succession. Following that initial flash, the LED (labeled HrtBt) should flash in a “heart beat” fashion to indicate that the processor is running and is not locked up. -
Page 55: Control Pod Power Led
If the volt meter indicates 48V is present at the control board power connector and the control board power LEDs are off, then the control board should be replaced. | 55 QMP16SU Service Manual... -
Page 56: Display Communications Leds
Possible Solutions • Try rebooting the Janome QMP16Su to see if the problem is corrected. • If not, verify that the cable connecting the display to the front of the machine is connected properly at each end and has not been damaged. -
Page 57: Led Light Ring Information
The LED cable runs from the light ring to the Control board for power connection. The light ring assembly comprises three part numbers: the circuit board, the cover, and the cable. Control board with LED light ring power connection LED light ring circuit board (16), shown in the cover: Board: QM20440 Cover: QM10146 | 57 QMP16SU Service Manual... -
Page 58: Round Tooth (Rt) Belt
Round Tooth Belt (RT) The Janome QMP16SU drive train assembly uses a round tooth belt system. Round tooth (RT) pulleys are used to match the round tooth belt and a flat (no teeth) belt tensioner pulley for belt tensioning. The drive train assembly with RT belt requires the following parts: •... -
Page 59: Electrical Notes Janome Qmp16Su
• Speed LED flashes on the Control board and on the main shaft encoder board when the hand wheel is rotated. It flashes 100 times per revolution of the hand wheel. What does 18VDC do? • 18VDC LED light ring for Janome QMP16SU • 18VDC drives signal to motor driver (motor speed control) What does 5VDC do? •... - Page 60 • Needle LED: Goes on and off as the hand wheel is rotated (on from needle lowest position until the needle is up and the take-up lever is at its highest position; and off from when the take-up lever is just 60 | www.Janome.com...
- Page 61 • 18VDC LED: Is lit constantly (same) • 5VDC LED: Is lit constantly (same) NOTE: The Control board does not have three beeps any longer, because the front display is connected and communicating properly with the Control board. | 61 QMP16SU Service Manual...
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Page 62: Janome Qmp16Su Screens
8. Janome QMP16SU Screens Main Screen Main Screen Main Screen Regulated, Cruise) (Regulated, Precision) (Manual) Alarms Screen Calculator Screen Machine Tools Left options: Calculator, Alarms, Languages Right options: Diagnostics, Timers, Update 62 | www.Janome.com... -
Page 63: Diagnostics
Needle Sensor Test, Keypad Test, X-Motion Sensor Test Information Screen On Diagnostics Screen Motor Sensor Test When to use the Motor Sensor Test The system has power, but the motor is not running or is running erratically. | 63 QMP16SU Service Manual... - Page 64 • Position the forked main shaft encoder board such that it is centered with the encoder disc and is up as high as possible without interfering with the disc. The disc should not touch any part of the encoder 64 | www.Janome.com...
- Page 65 How to use the Needle Sensor Test As you rotate the hand wheel, you should hear a solid tone start when the needle is in the UP position and then stop when it reaches the down position. | 65 QMP16SU Service Manual...
- Page 66 The control board then looks at how fast the motor is really going and compares it with the speed it should be going. For example, a Janome QMP16SU machine set at 10% speed should be driving the motor at 180 RPM.
- Page 67 • Use method 1 and run at least five complete cycles. • If you continue to receive this error message, run for another five cycles. If that fails to resolve the | 67 QMP16SU Service Manual...
- Page 68 ESD Field Service Kit QM49400 Customer Timing Kit QM10589-11A Hook grub/set screws QM20791 Stitch Regulation Termination Ribbon Cable NOTE: The gender for this cable at the Control board is female. QM10197 Take-up Spring QM49262 Retailer Lube Kit 68 | www.Janome.com...
- Page 69 Notes | 69 QMP16SU Service Manual...