handi quilter HQ Stitch 710 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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