Janome 1600P-QC - User manual

1600P-QC
SERVICE MANUAL
SERVICE MANUAL
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PARTS LIST
PARTS LIST
1600P-QC

1600P-QC

1600P-QC
Table of Contents
Replacing the External parts
Face Plate ........................................................................................ 2
Top Cover ......................................................................................... 2
Belt Cover......................................................................................... 2
Motor Cover...................................................................................... 2
Base ................................................................................................. 2
Mechanical Adjustment
Needle Bar Height ............................................................................ 3
Presser Bar Height ........................................................................... 3
Feed Dog Height .............................................................................. 4
Feed Dog Alignment ......................................................................... 4
Feed Cam Timing ............................................................................. 5
Feed Lifting Cam Timing .................................................................. 6
Needle to Hook Timing ..................................................................... 7
Clearance Between Needle and Hook Point .................................... 7
Hook Stopper Position...................................................................... 8
Bobbin Winder Stopper .................................................................... 9
Check Spring Stroke ........................................................................ 10
Pre-tension Dial................................................................................ 10
Knee Lifter Lever .............................................................................. 11
Needle Threader............................................................................... 12
Replacing the Electronic Components
Location of the Electronic Components............................................ 13
Location of the Connectors .............................................................. 13
Internal Wiring .................................................................................. 14
Circuit Board-A ................................................................................. 15
Circuit Board-F and Slide Volume .................................................... 16
To Replace the Printed Circuit Board UD ......................................... 17
Driving Motor .................................................................................... 18-19
Needle Stop Position ........................................................................ 20
Power Transformer........................................................................... 21
Machine Socket ................................................................................ 21
Light Bulb ......................................................................................... 22
Adjustment of the Thread Cutter Mechanism
Thread Cutter Blade ......................................................................... 23
Thread Guide Plate .......................................................................... 24
Static Cutter Blade ........................................................................... 25
Needle to Cutter Cam Timing ........................................................... 26
Thread Drawing Lever...................................................................... 27
Auto Tension Release....................................................................... 28
Thread Cutter Troubleshooting ........................................................ 29
Parts list .............................................................................................. 30-51
1

2
Remove the setscrews (4 x 25) .
Lift the top cover and pull out the motor connec-
tor . Remove the top cover.
Replacing the External Parts
1. Face Plate
Remove the setscrew (4 x 10) and washer .
Remove the face plate .
2. Top Cover
3. Belt Cover
Remove the 3 setscrews (4 x 12) and the belt
cover .
Pull out the socket connector from the printed
circuit board UD connector .
NOTE:
When attaching the belt cover, engage the hooks
with the motor cover.
4. Motor Cover
Remove the 3 setscrews (4 x 12) and remove
the motor cover .
5. Base
Remove the 4 hinge screws , washers , rubber
feet and base washers . Remove the base .
To attach:
Follow the above procedures in reverse.
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!0
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!1
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1. Needle Bar Height
Remove the face plate.
Turn the handwheel to bring the needle bar to the
lowest position.
Loosen the setscrew . Move the needle bar up
or down and match the upper hairline with the
bottom edge of the needle bar bushing .
NOTE:
Be sure not to rotate the needle bar when adjusting the
needle bar height. The needle clamp screw should be par-
allel to the upper shaft.
Tighten the setscrew and attach the face plate.
6.0mm
Mechanical Adjustment
2. Presser Bar Height
The distance between the bottom of the presser foot in up
position and the needle plate should be 5.7–6.3 mm.
Remove the face plate and needle.
Lower the feed dog below the needle plate. Place a
block 6 mm thick under the presser foot and lower the
presser foot lifter.
Loosen the setscrew . Raise the presser foot lifter
and tighten the setscrew firmly.
Attach the needle and face plate.
NOTE:
Make sure that the presser foot should be parallel to the
feed dog slots in the needle plate.
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Presser foot should be parallel
to the feed dog slots.

4
0.8 - 1.0mm
3. Feed Dog Height
When the feed dog is fully raised the height should be
0.8–1.0 mm above the needle plate.
Set the stitch length dial at 6 (Maximum). Turn the
handwheel to bring the feed dog to the highest
position.
Loosen the setscrew .
Turn the eccentric pin to adjust the feed dog height
to 0.9 mm.
• If the feed dog is too low, turn the pin to the right .
• If the feed dog is too high, turn the pin to the left .
Tighten the setscrew .
4. Feed Dog Alignment
The lateral gaps between both sides of feed dogs and
needle plate slots should be even.
The crealance between the front end of the center feed
dog and center slot should be 4.2–4.8 mm when the stitch
length dial is set at 0.
Remove the base and lay the machine on its back.
Set the stitch length dial at 0.
Loosen the setscrews . Move the feed base up
or down to adjust the clearance between the front
end of the center feed dog and center slot to 4.5 mm.
Adjust the lateral position of the feed dogs by moving
the feed rock shaft to the right or left if neccessary.
Tighten the setscrews . Set the stitch length dial at 6
and turn the handwheel to check if the feed dogs do
not touch the needle plate.
Attach the base.
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Lateral gaps should be even.
4.2 - 4.8 mm
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5
17.5mm
 A
B
5. Feed Cam Timing
To Check:
Lower the needle bar by turning the handwheel until
the point of the needle is 17.5 mm above the upper sur
face of the needle plate .
The feed dogs should not move when moving the
reverse stitch lever up and down.
If the feed dogs move, adjust the feed cam timing as
follows.
To Adjust:
Remove the base and lay the machine on its back.
Lower the needle bar until the needle point is 17.5 mm
above the needle plate .
Loosen the setscrews .
While moving the reverse stitch lever, turn the feed
cam in the direction either Aor Buntil the feed
dogs stop moving.
Tighten the setscrews and attach the base.
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6
B
A
0.4mm
0 – 0.1mm
6. Feed Lifting Cam Timing
To check:
Lower the needle bar until the point of needle is
0.4 mm below the needle plate .
The top of the feed dogs should be 0–0.1 mm
above the needle plate.
To adjust:
Remove the base and lay the machine on its back.
Lower the needle bar until the needle point is 0.4 mm
below the needle plate .
Loosen the setscrew .
If the feed dogs are higher, turn the feed lifting cam
in the direction A.
If the feed dogs are lower, turn the feed lifting cam
in the direction B.
Tighten the setscrew e and attach the base.
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7
0 – 0.1mm
2.0mm
2.0mm
7. Needle to Hook Timing
Remove the needle plate.
Loosen the 3 setscrews . Pull out the hook race
very slightly (less than 0.5 mm).
Raise the needle bar from the lowest position until the
lower heirline of the needle bar matches the edge
of the needle bar bushing .
NOTE:
The needle bar rises 2 mm from the lowest position.
Rotate the hook to match the hook point with the
right side of the needle.
Tighten the setscrews slightly and proceed with the
adjustment of the clearance between the needle and
hook point.
8. Clearance Between Needle
and Hook Point
The clearance between the needle and hook point should
be 0–0.1 mm.
Turn the handwheel to bring the hook point behind
the needle .
Knock on the hook race rim lightly to make a slight
clearance between the needle and hook point.
NOTE:
Do not knock on the hook body.
Tighten the setscrews firmly and check the needle to
hook timing and the thread path (0.4–0.8 mm).
Attach the needle plate.
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Lowest position
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0 – 0.1mm
0.4 – 0.8mm

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9. Hook Stopper Position
Remove the needle plate, base and feed dog.
Loosen the setscrew and move the hook stopper
so that the center of the needle is located between
the center of th hook stopper and outer side of the
hook stopper spring .
Tighten the setscrew and attach the needle plate
and base.
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B
A
16.5 –19.5mm
10. Bobbin Winder Stopper
The amount of thread wound on the bobbin should be
16.5–19.5 mm in diameter.
Loosen the setscrew . Turn the bobbin winder
stopper to adjust the thread amount.
• If the amount is too mauch, turn the stopper in the
direction A.
• If the amount is not enough, turn the stopper in the
direction B.
Tighten the setscrew firmly.
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11. Check Spring Stroke
The amount of the needle thread supplied by the check
spring should be 11–15 mm.
Thread the machine up to the thread guide and
lower the presser foot.
Lower the needle bar to the lowest position.
Hold the thread end and mark the point on the
thread beside the thread guide.
NOTE:
There should be no slack in the thread.
Pull the thread gently to the left until it stops (the
check spring went full stroke).
Measure the length of thread drawn out.
Loosen the setscrew and move the tension dial
guide to adjust the stroke.
• If the length is too long, turn the guide in the direction A.
• If the length is too short, turn the guide in the direction B.
Tighten the setscrew .
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A
B
11–15 mm
12. Pre-tension Dial
The standard position of the pre-tension dial is as follows:
The screw head sinks 4 mm below the dial face.
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4 mm
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7.5mm
13. Knee Lifter Lever
The presser foot rises 7.5 mm when it is fully raised with
the knee lifter.
Remove the base and lay the machine on its back.
Loosen the nut on the knee lifter lever slightly
and turn the adjusting screw to adjust the height.
• If it is lower than 7.5 mm, turn the adjusting screw
clockwise.
• If it s higher than 7.5 mm, turn the adjusting screw
counterclockwise.
Tighten the nut firmly and attach the base.
NOTE:
Lower the needle bar to the lowest position and check if
the needle cramp does not hit against the presser foot when
it is fully raised.
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14. Needle Threader
To remove:
Remove the face plate.
Pull the threader out from the threader shaft .
To attach:
Align the groove of the theader with the pin on
the threader shaft. Push the threader up until it snaps
in place.
To adjust:
If the threader hook thrusts or hits against either
left or right edge of the needle eye :
Loosen the setscrew . Move the threader plate
to adjust the lateral position of the threader hook .
If the threader hook thrusts or hits against either
top or bottom edge of the needle eye , or misses
the needle eye :
Loosen the setscrew . Move the threader position
setting plate up or down to adjust the vertical
position of the threader hook .
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Circuit board F
Lamp
Circuit board A
Slide volume Bobbin winder switch
Upper shaft sensor
Power transfomer
Circuit board MS
Driving motor
Machine socket
Push - pull solenoid
Capacitor
Thread cutter switch
Bobbin winder motor
Replacing the Electronic Components
1. Location of the Electronic Components
2. Location of the Connectors
Motor sensor Circuit board-F
Thread cutter switch
Machine socket (primary)
Power transformer
(primary)
Driving motor
Machine socket (secondary)
Slide volume
Arm lamp
Power transformer
(secondary)
Bobbin winder
switch
Push-pull
solenoid
Capacitor
Upper shaft sensor
Lamp

14
Cord guide (1)
Cord binder
Cord guide (2)
3. Internal Wiring
To prevent the internal wirings from contacting the moving parts or being caught in the joint of the external
parts, the internal wirings should properly be routed and secured as illustrated.
Thread cutter cord
Motor cord
Motor sensor cord
Machine socket cord (primary)
Machine socket cord (secondary)
Push-pull solenoid cord
Capacitor cord
Motor cord
Motor censor cord
Cord guide (1)
Setscrews for cord guide (1)
Cord binder

15
F1 Fuse
(AC250V3.15A)
F2 Fuse
(AC250V 3.15A)
4. Circuit Board-A
To remove:
Remove the top cover.
Pull out connectors from the circuit board-A.
Remove the cords from the cord clips .
Remove the setscrews and the board-A
case lid .
Pull out the connectors under the case lid.
Remove setscrews and circuit board-A.
To attach:
Install the circuit board-A and secure it with
the setscrews .
Insert the following connectors:
Machine socket (primary)
Power transformer (primary)
Driving motor
Attach the board-A case lid and secure it
with the setscrews .
Insert the remaining connectors and secure
the cords with the cord clips on the case lid.
Attach the top cover.
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect, grasp the connector, not the cord.
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Changing the Fuse
Remove the Fuse from Fuse clip with a screw
driver.
Insert a new fuse and push it down into the fuse clip.
NOTE:
Replace the fuse with the same type and rating.
If there is any trace of burning, browning or other
abnormalities on the circuit board-A, replace it.
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Fuse Manufacture Type
F1 SOC ET-3.15A-250V
F2 SOC ET-3.15A-250V

16
Removed the top cover.
Pull out the circuit board-F connector , slide
volume connector from the circuit board-A .
Loosen the 3 set screw (A). Remove the
ornamental panel .
Remove the 3 set screws (B) and remove the
circuit board-F from the panel.
Remove the 2 CS-rings and slide volume .
To attach: follow the above procedure in reverse.
(B)
(A) (A)
5. Circuit Board-F and Slide Volume
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6.To Replace the Printed Circuit Board UD
Cord binder
Printed circuit board A Connector Cord guide
Setscrew B
New printed circuit board UD
Thread cutter button unit
Setscrew A
To remove:
zRemove the top cover, belt cover and base.
xRemove the cord binder below the handwheel.
cDisconnect the connector of the thread cutter from the
printed circuit board A.
Remove the setscrew A and cord guide.
vRemove the setscrew B and the thread cutter button
unit.
Replace the printed circuit board UD.
To attach:
Follow the procedure above in reverse.

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7. Driving Motor
To remove:
Remove the belt cover and motor cover.
Pull out the motor sensor connector .
Pull out the motor connector , while pushing the
connector lock .
Remove the nuts and driving motor .
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect, grasp the connector, not the cord.
(to be continued on next page.)
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