handi quilter HQ Stitch 710 User manual

Category
Sewing machines
Type
User manual
Service Manual
05/29/18
HQ Stitch 710
Top Cover Removal (pages 2 and 3, HQ Stitch Technical Bulletin #0001)
Machine Base Plate and Base Cover Removal Bed Cover Removal
Belt Cover Removal
Front Panel Removal
Free Arm Cover Removal
Lubrication
Feed Dog Height
Presser Bar Height and Radial Angle
Needle Position (Front-to-Back)
Needle Position (Left-to-Right)
Needle-to-Feed Timing Theory , Check and Adjustment
Needle Bar Height
Needle-to-Hook Clearance
Hook Gear Backlash
Needle-to-Hook Timing
Needle Threader Plate
Upper Feed Dog Timing (Part 1)
Upper Feed Dog Timing (Part 2)
Needle Plate Micro switch
Thread Tension Unit Adjustments
Automatic Thread Cutter Removal, Adjustments, and Installation
Stretch Stitch Feed Balance
Parts of the Front Panel
Printed Circuit Board ‘A’ Removal
Printed ‘A’ Circuit Board Diagram
Touch Panel Replacement
DC Motor Removal and Installation
Switching Power Supply Removal and Installation
Free Arm Cover Installation
Front Panel Installation
Bed Cover Installation
Belt Cover Installation
Machine Base Plate and Base Cover Installation
Top Cover Installation
Touch Screen Calibration
1-4
5
6
7
8-10
11-12
13-28
29-31
32
33
34
35 and 36-37
38-39
40-41
42
43-44
45
46-48
49
50
51
52-55
56-57
58
59
60
61-62
63
64-65
66
67-68
69
70
71
72
73-74
Table of Contents
Diagnostic Tests 01 -14:
•Test 01: Function of LCD, Buzzer, and LEDs
• Test 02: Key (Button)
• Test 03: BH (Button Hole Sensor)
• Test 04: BO (Bobbin Winder Sensor)
• Test 05: Presser Foot Lifter Switch
• Test 06: PH (Phase or Lower Shaft Shield Positioning Sensor)
•Test 07: STM (Zig Zag Step Motor and Feed Motor)
• Test 08: FC (Foot Control)
• Test 09: Slide Volume
•Test 10: DC (Motor)
• Test 11: SO (Thread Tension Release Solenoid)
• Test 12: Cut (Thread Cutter Motor, Cutter Solenoid)
• Test 13: Feed Dog
• Test 14: PS (Needle Plate Sensor)
Appendix II: Diagnostic Tests
Supplement: Mechanical Adjustments (This supplement covers the same
information contained in this service manual. Use it as necessary for further
clarification about making adjustments to the HQ Stitch
710.)
75-88
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
Table of Contents (cont.)
Edit Notes:
11/03/16: page 47, #1: added note that tool blade is 2.5mm and can be used as
gauge. 11/03/16: page 49, added circled around gap on black tension release.
11/04/16: page 44, clarified steps with letters a - g.
11/04/16: page 47, improved picture #1.
11/09/16: page 56, see page 8 note added .
11/09/16: page 73, corrected from "Factory Adjust" to "- - - -" as seen on screen.
11/09/16: page 76, circled correct small black screw instead of large silver screw.
11/09/16: page 76, removed erroneous BH and corrected wording to symbol.
11/09/16: page 86, clarified wording on step 1 and 2.
02/16/17: updated warning notes on cutter and pretensioner screw on page one
and added Technical Bulletin #1 as pages 2 and 3.
05/29/18: corrected information on page 35, check #2, to: ...the feed dogs will
be at their highest position again as the needle reaches its highest position. The
feed dogs should be down when the needle is down and up when the needle is
up.
Top Cover Removal (1 of 2)
1. Put the handle down and lift up the top
cover lid. Locate the large Phillip’s screw
directly behind and to the left of the bobbin
winder and the screw directly under the
horizontal spool pin. Remove the screws
completely and lay them inside the cover.
2. Remove the bobbin cutter from the bobbin
winder post. Important note: use a small
flat screw driver or L shaped hex tool to pry
up on the center underside of the cutter.
Do not pull up on one outer edge with your
finger or screw driver because this will
break off the outside edges of the cutter!
1
3. Important Note: Do not try to remove
this screw! It adjusts the height of the
pre-tension so the bobbin will wind
evenly. When the screw is screwed in or
out it also changes the pre-tension on the
bobbin. The screw has a nut on the back
side. It was set in the factory and should
be correct unless someone has
inadvertently changed it; e.g. tried to
loosen it to remove the top cover. See
HQ Stitch Technical Bulletin #0001:
HQ Stitch 710 Pre-Tension Information,
Preventing Bobbin Winding and Sewing
Issues.
2
HQ Stch
Technical Bullen #0001
02/16/17
This bullen is provided to give HQ Stch technicians
and salespeople addional informaon on the HQ
Stch 710 pre-tension assemblies. The goal is to
increase understanding of the pre-tensions to help
prevent poor bobbin winding and sewing results due
to improper threading of the pre-tension assemblies.
Back Ground Information:
The HQ Stch 710 has two pre-tensions. Both are
used for bobbin winding. Only the front pre-tension
is used for sewing. If the machine is not threaded
properly the bobbin winder will not wind bobbins
rmly and the machine will not sew properly. Also
if someone improperly adjusts the bobbin winder
pre-tension assembly it will cause sewing and tension
issues.
Make sure to pull the thread to the front unl it
clicks into the rst sewing pre-tension and then back
around the le thread guide to the bobbin winding
pres-tension. Use both hands to pull the thread
rmly into the pre-tensions as shown in the winding
the bobbin secon of the user Instrucon Book.
You should feel a good pre-tension on the thread
when winding a bobbin or the machine is either not
threaded correctly or the pre-tension has been mal
adjusted by someone, perhaps inadvertently.
In the following picture the machine is threaded for
bobbin winding with the covers removed to show the
thread path clearly. It is important to note that the
thread is going through both the back bobbin winder
pre-tension and the front sewing pre-tension.
HQ Stch 710 Pre-Tension Informaon
Prevenng Bobbin Winding and Sewing Issues
The HQ Stch 710 machine comes with the bobbin
winder pre-tension set from the factory to wind
a bobbin rmly and evenly from top to boom.
Should one mistake the pre-tension assembly
screw as a top cover fastening screw and ghten or
loosen the screw, this may render the pre-tension
ineecve and cause poor sewing results.
When one mistakenly adjusts the pre-tensioner
assembly screw it will not only eect how evenly the
bobbin winds, but also how rmly the bobbin winds.
3
The height of the pre-tension assembly determines
how evenly the bobbin winds top to boom. When
the screw is ghtened or loosened too much it also
causes the pre-tensioner assembly to release the
thread while winding a bobbin. With no pre-tension
on the bobbin it will wind too loose or spongy. Loose
bobbins cause signicant sewing and tension issues.
The small screw below right controls the bobbin ll
stopper. If one changes the stopper to the le it
will make the bobbin stop winding sooner, lling the
bobbin less. If it is moved to the right it will allow the
bobbin to winder later lling the bobbin more. This
might be inadvertently changed by someone when
trying to remove the top cover.
With the machine top cover removed one can see
the pre-tensioner screw lock nut. It should have
about two metal threads showing above the nut as
shown in the image below.
Visual Checks:
By looking at the pre-tension screw one can see if
the screw has been adjusted in/clockwise and is low
in the lile cover over the bobbin winder pre-tension
or out/counterclockwise to be high and pung
pressure up on the cover.
In the correct posion the screw head will be slightly
under the cover and not touching the boom surface
of the cover. It will also not be deep in the hole with
a big gap between the screw head and the cover.
The image below shows the relave posion of the
bobbin winder pre-tension assembly screw. It is just
below the cover, so the cover is not resng on it,
but not too far below. If your screw looks dierent
someone may have inadvertently adjusted it.
The image below shows the bobbin winder pre-
tension without the covers. Under the head of the
screw there is a small spring, the two metal pre-
tensioner plates and an e-clip. The e-clip suspends
the pre-tensioner assembly above the plasc top
cover surface.
Top Cover Removal (2 of 2)
3. Close the lid and lift
up the handle.
Remove the small Phillips
screw on the left, needle
end of the machine.
4. With the handle up, start
to lift up on the left side of
the top cover. As you lift
up be careful of the clips
that hold the top cover
firmly to the front panel
(see three clips circled in
red). Continue to lift up
and using your other hand
push the left of the cover
back through the handle
towards the rear of the
machine.
4
Machine Base Plate and Base Cover Removal
1. Slide the accessory box off of the machine
by pulling it to the left.
2. Gently lay the machine on its back. Locate
the four screws on the base plate. Remove
them completely and pull the plate off toward
you. (Note: the screws on the left are self
tapping screws with coarse threads going into
plastic. The screws on the right are machines
screws with fine threads going into metal)
3. Remove the four self tapping screws with
coarse threads going into plastic that hold the
machine base plate. To remove the plate
without scratching it on the table, lift the end of
the machine up off the table by grabbing the
free arm before sliding off the baseplate.
5
Bed Cover Removal
1. Locate the two screws that hold the bed
cover to the machine. Remove these two set
screws. (Machine screws with fine threads)
2. First pull down on the end of the cover and
second very gently start to slide the bed cover
to the left. Be careful how you pull it because
there are wires underneath and you do not
want to scratch or cut them.
6
1
2
Belt Cover Removal
1. Loosen the two washer screws a couple
turns that hold the belt cover to the casting
on the bottom hand wheel side of the machine.
2. Carefully lift the machine back
upright. Lift up on the handle and
loosen the small washer screw a couple
turns directly under the handle on the
right side.
3. Remove the Phillips screw directly
under the hand wheel.
4. Carefully start to pull on the back of
the belt cover to release the clips that
hold it to the rear cover. As you start to
release it from the top, work your way
down to release the other four clips.
7
Front Panel Removal (1 of 3)
1. Open the face plate on the left side of
the machine and locate the small
Phillips head washer screw directly
behind the “Reverse button that is
holding the front panel to the casting.
Loosen this screw a couple turns, but
do not remove it.
2. Loosen a couple turns, but do
not remove, the Phillips head washer
screw at the upper-right side of the
front panel.
3. With the belt cover removed, look in
through the right side of the machine
below the hand wheel. Locate the
washer screw deep inside the machine
behind the timing belt. Loosen the
washer screw a couple turns but do not
remove it.
8
Front Panel Removal (2 of 3)
4. Gently lay the machine down and
loosen the two Phillips washer screws
that hold the bottom of the panel to the
casting.
5. Using a flat head screwdriver, gently
push down on the open holes of the
casting directly behind the upper shaft.
This is where the front cover meets the
rear cover. As you pull out on the front
panel, push down on these two
openings.
9
Push up on the bottom of the front cover or down on the rear cover to start separating the front
cover tab from the rear cover slot.
Front Panel Removal (3 of 3)
10
6. Unplug the 14 wires that plug into the ‘A board that holds the front panel to the machine.
There are a total of 18 wires plus the small ribbon connection to the board, but the ribbon
and the 4 circled wire connections stay connected to the board and front cover when it is
removed. Important note: Always grab the wires from each connector as a group
and pull straight outward. Never grab a single wire.
Important: 4 conductor white
plug with "yellow",orange,
red, brown - connects to
bottom center of "A" board
Important: 4
conductor white
plug with "blue",
orange, red, brown;
connects to middle
center of "A" board
Free Arm Cover Removal (1 of 2)
1. Remove the presser foot, shank, and
needle. Then, raise the presser bar to
its highest position.
2. Gently lay the machine on its back.
Locate the pin with a spring and c-clip
just to the left of the silver, feed cam
fork on the bottom of the machine.
3. Using the butt-end of your
screwdriver, firmly push the pin toward
the top of the machine. This will release
the needle plate from the machine.
11
4. Carefully remove the needle plate.
Free Arm Cover Removal (2 of 2)
1. Place the machine back
machine back upright on its feet.
On the back side of the free arm
locate and remove the silver, flat-
head post on the inside of the free
arm and the Phillips washer screw
on the end of the free arm. (The
cover comes off easier if this
washer screw is removed rather
than loosened. This is an
exception to the rule of only
loosening washer screws a couple
turns rather than removing them.
2. Carefully pull the cover toward
the end of the machine and then lift
up.
3. If the cover does not want to
release, lift up on the inside of the
cover as you are pulling the cover
toward the end of the machine.
12
Lubrication Notes
Factory Note: “Factory lubricated parts
will provide years of household sewing
without routine oiling. However,
whenever the machine is being serviced,
check to see if any parts need to be
lubricated.
13
Appendix I: Lubrication
Lubrication Notes
1. Oil: Put a drop of HQ Stitch oil on each
point.
2. Grease: Put a small amount of HQ
Stitch grease on each point.
3. Excessive lubrication can cause more
harm than good. Use only a little lube in
the right place.
14
Oil Put a drop of oil on the following:
#1 The presser bar at the bottom bushing (inside
the left hinged cover).
15
Oil Put a drop of oil on the following:
#2 The top and bottom of the needle bar at the
bushings (inside the left hinged cover).
16
Oil Put a drop of oil on the following:
#3 The needle bar support top hinge pin oil
orifice (seen after removing the top cover and the
presser bar pressure adjusting knob).
17
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handi quilter HQ Stitch 710 User manual

Category
Sewing machines
Type
User manual

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