JUKI HZL-K85 User manual

SERVICE MANUAL Date:
2011/09/23
Page:
1/39
Model:
K65&K85
Original issued: Sept.2011

SERVICE MANUAL Date:
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Page:
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Model:
K65&K85
CONTENTS
SEC. 01-----Disassembling outer covers
SEC. 02-----Test mode
SEC. 03-----Adjustment of feed-dog height
SEC. 04-----Needle bar height
SEC. 05-----Needle threader height
SEC. 06-----Presser foot height
SEC. 07-----Needle position
SEC. 08-----Clearance between needle and shuttle hook
SEC. 09-----Needle timing to feed-dog
SEC. 10-----Needle timing to shuttle
SEC. 11----- Meshing condition of shuttle gear and lower gear
SEC. 12----- Adjustment of thread tension
SEC. 13----- Retaining bracket for bobbin case
SEC. 14----- Origin point positioning of zigzag bight
SEC. 15----- Origin point positioning of stitch length
SEC. 16-----Electrical components
SEC. 17-----Wiring diagram

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SEC. 01 Disassembling outer covers
1. Lay the machine on its back.
2. Remove screw for rubber feet.
3. Remove rubber foot for adjustment by hand.

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4. Remove base cover.
5. Remove screw for bottom cover.
6. Remove the bottom cover.

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7. Lift the machine and remove screws on needle plate.
8. Remove needle plate.
9. Remove screw for face cover.

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10. Remove screw on rear cover.
11. Remover screw on rear cover which is located near face cover.
12. Remover cover fixing screw near face cover.

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13. Lift the rear cover using screw driver and remove projection
of the cover from machine body.
14. Remover the rear cover.
15. Remover screw from top cover.

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16. Remove fixing screw inside the top cover.
Photo is left side (Lamp cover side) view.
17. Position of the above screw is shown below with the top cover removed.
18. Lift the top cover at side of hand wheel.
Foot of top cover

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Lift the top cover at the side of face cover.
Remove the top cover by lifting it at the same time.

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19. Loosen screw of front cover at the side of hand wheel
so that it may make it easier to re-assemble it.
20. Loosen screw of fixing foot of front cover at the side of hand wheel.
.

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21. Remove screw of front cover at the side of hand wheel.
22. Remove tapping screw at needle bar as shown.

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23. Remove flat cable connected with circuit board fromAC circuit board.
24. Remove the front cover from machine body.

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Model:
K65&K85 SEC. 02 Test mode
Move bobbin-winder shaft to operating
position.
Press and hold the “Reverse button”.
Turn on sewing machine.

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Model:
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Model K65
Release bobbin-winder shaft by the
time when LED of pattern select
button is lit at lowest line.
Model K85
Release bobbin-winder shaft by the
time when LED display is lit at “00”
as illustrate below.

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Test mode 1
Function: Zero feed, three needle positions (L/C/R)
Test mode 2
Function: Zero feed, center needle position
Test mode 3
Function: 2mm feed, center position, 11stitches forward and back ward.
Test mode 4
Function: repeat 4mm feed forward and 3mm feed backward, three needle
positions (L/C/R)
Test mode 5
Function: stitch “Darning pattern”
K65⇒ K85⇒「00」
1
Model K85
Model K65
1 2
3
4
5
6
K65⇒ K85⇒「01」
2
K65⇒ K85⇒「02」
3
K65⇒ K85⇒「03」
4
K65⇒ K85⇒「04」
5

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Model:
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Test mode 6
Function: origin point positioning of zigzag bight and stitch length.
Zigzag width manual adjustment button LED lit when select #6 button
first. For origin point positioning of stitch length, push stitch length
manual adjustment button
Model K85
Model K65
K65⇒ K85⇒「05」
6

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Model:
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SEC. 03 Adjustment of feed-dog height
Checking:
1. Set stitch length at zero feed.
2. Move feed dog to its highest position by turning hand wheel.
Check to see if feed dog height is as illustrated below.
Adjustment:
1. Remove needle plate. Remove bottom cover.
Adjust feed-dog with reference photo for vertical movement below.
Note: When turning screw, use driver only.
0.9 – 1.1 mm
Viewing from back side.
b
c
d
e
Mounting bracket of feed-dog

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Turn screw (a) to get gap between end (b) of screw (a) and vertical movement
control cam 1 (c).
Open front cover and back cover as shown below for adjustment of screw (d).
Adjust the height of feed-dog by turning screw (d) at side of vertical movement
control cam2 (e) until the height of feed-dog obtains correct position.
After adjustment screw (d), be sure that gap between end (b) of screw (a) and
vertical movement control cam 1 (c) is 0.1mm.
a
bc
b
d e
c
b
0.1mm

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Model:
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SEC. 04 Needle bar height
Note: Make this checking before checking “Needle timing to shuttle” and
”Feed-dog timing (vertical motion)”. Use needle #90/14.
Checking:
1. Select straight stitch at center needle position.
2. Remove presser foot and needle plate, and then remove bobbin case.
3. Replace needle with special needle gauge (L=29 mm).
4. Lower the needle gauge to its lowest position by turning hand wheel by hand.
Check to see if the bottom of the needle gauge aligns with shuttle race pushing
the needle lightly as shown by arrow mark.
Adjustment:
1. Remove face cover.
2. Loosen screw (a) of needle bar clamp using hex screw driver and adjust
the height of needle bar.
Lowest position of
Needle gauge
Shuttle race
Needle gauge L = 29 mm

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3. Tighten the screw (a) securely after adjustment. Replace needle gauge with
normal needle #90/14.
4.Check to see if needle threader operates correctly and there is not interference
in vertical movement of needle bar.
a