Brother Electroknit KH-910 User manual

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*REMARKS . .....:::T..
l. Checking the function of the carriage
ll. Ghecking the function of the machine body ........
1. Kcarriagemovement
, 2. Needle selector mechanism (Mechanical part) ......'.'...
ll !. How to adjust the K carriage
1 . The K carriage does not move smoothly .'.'..'.........
2. The fabric floats (Stitch float) '..."...'
3. A lateral stripe is produced every second row '........'...
4. The carriage does not move when needle selected B position
5. The end needles do not come out
lV. How to adjust the L carriage ..........'..
1. Wrong bilateral position of the leaf spring '........
2. Wrong vertical position of the leaf spring .........
3. Wrong position of the feed hook .'......'..
4. When L carriage sinker plate is crooked
5. When main cam is replaced
V. Needle selector mechanism (Mechanical part)
1. lf some needles do not come out to position D at random
2. lf some needles do not come out to position D but are selected
regularly at 16 or 8 cycle
3. K carriage movement is too heavy
4. Adjustment ."..'..."......
Vt. Checking the parts connected with the power supply ..............
1 . lnitial live test
2. Action required for fault symptoms detailed in 1 "'.....'.."
2-1. The pilot lamp does not light ........'...
2-2. Buzzer does not make a sound ..........
2-3. The ready lamp does not light .'..'."....
2-4.The mark sensor in not turneci back to the left side of the
card reader and is not held in this position
2-5. The number "888" flashes on and off in the display 12
3. Checking the AC section 12
3-1. Test the AC main outlet 12
3-2. Testing the main lead "'....'.'... 12
3-3. Testing the AC low voltage circuit 12
3-4. Checking the AC input .......'.' 13
3-5. Checking the fuse (F601 ) 14
4. Checking the DC section 15
4-'l . The card feeding dial does not ratchet but the buzzer makes
a sound '15
4-2. Checking the circuits which are worked by +5V power supply ..." 16
Vll. Checking the needle selector solenoid 18
1 . Live test for the needle selector solenoid 18
2. Check the needle selector solenoids 18
3. There are some needles which are selected to position D ...'......'......".. 19
llX. Checking the pattern case (except the variation switcher) ........ ,n
lX. Checking the needle position detecting circuit 21
1. Check the needle position detecting circuit .....'... 21
2. All the needles are left in position B ....'..'......... 21
3. There are many needles selected to position D ."............. 21
4. lf the position of the needle selection slides to the left or right 21
5. Adjust the right position sensor ......... 21
6. Adjust the left position sensor ....'.... 23
X. Checking and adjustment of the card reader
1. Checking the mark sensor '..'....'
2. Exploded diagram for the card reader
3. The mark sensor does not move .........'.
4. The pattern card is not fed correctly
5. When pushing the CF key, and after mark sensor reads the card twice,
the number 2 of the Lwindowcomes tothe card inlet instead of No.1 .'.
6. lncorrect needle selection ..'...".......
7. Adjusting the card reader "..."."
Xl. Checking the pattern variation switches
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-1-

Xl!. Replacement
1. Replacing the pattern case whole unit ............
2. Replacing the main P.C.B. assembly '....'.".......
3. Replacing the power supply board .....'."'
4. Replacing the encoder board assembly ....'..."......
5. Replacing the power transformer
6. Replacing the timing belt and the rotary encoder assembly
7. Replacing the needle selector solenoid unit and solenoid itself ............
8. Replacing the card reader .........
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REMARKS
Pay attention to the following point to avoid creating more "faults".
1. The power supply cord should be removed from the wall outletwhen replacing
the mechanical parts and printed circuit boards, and when adjusting the
mechanical parts.
2. When removing connectors take care not to pull the cords themselves.
3. The screws and nuts should be tightened properly.
4. Do not lose the screws, nuts and washers and do not leave them in the machine,
they may cause a short circuit.
5. Take care not to damage the cords and the printed circuit boards with heat when
soldering.
6. The electronic components used in this machine can be damaged by static
electricity.
Touch a point known to be earth before handling the printed circuit boards.
Handle the boards by their edges, do not touch the components.
7. When carrying the printed circuit boards, pack them in an electric conductor like
an aluminum foil or antistatic bag.
Never pack in polyethylene or styrene.
8. Check the connectors in addition to the parts repaired, and then check the
machine is in working order.
9. The main supply should be the same as the rating of the machine.
-2-

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1.
CHECKING THE FUNCTION OF THE CARRIAGE
Change knob function.
When the change knob is changed to each position [N. L., KC(l)or KC(ll]l it
should move smoothly.
The right and left connecting plates, sensor magnet, separation cams and needle
selector change cams should work without fail.
MC cam operation.
When the end of right or left MC cam are pressed fully down and the gently
lifted with your finger while keeping the MC cam button depressed all the
time, the right and left MC cams should return to their original position by
spring pressure.
MC knitting change cam operation.
The right and left parts of MC cam should shift without fail while the MC cam
button is kept depressed.
Raising cam operation.
When the end of the right or left part of the raising cam is lifted fully with the
stitch dial at 0.5 or 10 position and gently lowered with your finger, the right
or left parts of the raising cams should be returned to their original position
without fail by the spring pressure.
Needle selection change cam operation.
When the change knob is set at "KC (l)" or "KC(ll)", and when the end of the
right or left part of the needle selection change cam is lifted fully and then
gently lowered with your finger, the cams should be returned to their original
position without fail by the spring pressure.
Separation cam operation.
When the change knob is set at "KC(l l)", the separation cam should move freely.
When the change knob is set at "KC(l)", the separation cam should not move.
The clearance between the separation cam and the needle selection cam must
be less than 0.5 mm.
Tuck cam operation.
When left and right tuck cam buttons are depressed, by gently lifting the left
and right tuck cam, they should return to their original position when released.
When the cam button is set to plain, the end of the tuck cam fingers can be
gently moved and they should return to their original position when released.
Cam button unit function.
When the cam button is changed to "TUCK R & L", "MC" or "PART R & L",
they should move smoothly. The tuck cam, MC cam or raising cam should
work without fail.
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9. Holding cam lever function.
When the holding cam lever is changed to "H" or "N", it should move
smoothly.
Plain knitting cam function.
When the plain lever is moved to right while pressing "TUCK R & L", "MC" or
"PART R & L" buttons, the lever should move smoothly and the cam buttons
should return to their original position without fail.
Make sure that the needle butt passes smoothly through the following; (Fig. 1).
1 ). Between the separation cam and rear foot.
21. Between the tuck cam plate and guide cam C.
3). Between the guide cam C and slide cam.
41. Between the sub stitch cam and guide cam B.
5). Between the needle selection cam and guide cam A.
6). Between the needle selection cam and guide cam G.
7],. Between the guide cam A and B.
8). Between the guide cam F and separation cam.
10.
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cam
guide cam C
guide cam B sli guide cams A
ide cam F
Separation cam
sub raising cam
guide cam D
Fig. 1

II. CHECKING THE FUNCTION OF THE MACHINE BODY
1. K carriage movement.
Set the sinker plate assembly on the carriage and set the change knob to position
"N.L.". Bring forward all needles (200 needles) to position B and move the K
carriage across and back to check its movement. The K carriage should move
smoothly and gently.
2. Needle selector mechanism (mechanical part)
Set the change knob to position "KC(ll)", and move the K carriage across and
back slowly and/or quickly to check the needle selector mechanism.
After moving the K carriage to the other side of the machine, all the needles
should be selected to position D.
III. HOW TO ADJUST THE CARRIAGE
The K carriage does not move smoothly.
1-1. Carriage rail lacks oil.
Oil needle butts and stitch cams.
1-2. Needle bed rail lacks oil.
Oil front and rear rails of the machine body and carriage.
1-3. The sinker plate is in contact with gate pegs.
Adjust sinker plate position.
1-4. The sinker plate keeps the knitting needles up.
Adjust the gap between the sinker plate and the needle.
The fabric floats (stitch float)
2-1. The sinker plate is in contact thegatepegs,or there is too much gap between
the sinker plate and the gate pegs.
2-2.The sinker plate keep the knitting needles up, or there is too much gap
between the sinker plate and the needle.
*Position adjustment of the sinker plate. (Fig. 2).
1. Mounting dimensions of sinker plate.
The sinker plate should be 118.5 mm apart from the carriage.rear leg.
lf it is not correct, loosen screws and adjust.
2. Mounting dimensions of yarn feeder.
The yarn feeder should be 120.5 mm apart from the carriage rear leg.
118.5 m/m 120.5 m/m 118.5 m/m
Fig.2
*Vertical adjustment of the sinker plate. (Fig. 3).
1. Fit the carriage on the needle bed and set the holding cam lever at "H".
2. Bring about five knitting needles each to position E at the left end, center
and right end of the needle bed.
3. Bend the sinker plate to adjust the gap between the knitting needle stem
and the sinker plate 0.5 mm or less.
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-4-

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A lateral stripe is produced every second row.
The right and left parts of the stitch cam are positioned differently.
*The stripe adjusting plate is connected with the stitch cam, and the stitch cam
guide plate is connected to the right and left stitch cams.
3-1. Loosen the stripe adjusting plate clamp screw. Use slide calipers to adjust
the stripe adjusting plate so that the length (at a and a') of the right and left
parts of the stitch cam are even. The tighten the stripe adjusting plate
clamp screw.
Note: The length difference at the stitch cam (between a and a') should
not exceed 0.35 mm.
Hint: When the stitch dial is set at 5, the length at the stitch cam: 32.5
mm. (Fis.4).
3-2. After adjustment, be sure to check it by knitting plain stitch using a medium
yarn and the stitch dial set at 5.
56.5 m/ms
Rear leg Fis.4
4. The carriage does not move when needle selected B position.
The latch of the knitting needle is bent.
4-1. Guide cam A is in wrong position.
Mounting dimentions of guide cam A.
1. Loosen the right and left guide cam A clamp screws and the plate clamp
nut. Clamp again after adjusting the distance between guide cam A and the
carriage rear leg to 56.5 mm. (Fig. 4).
Note 1: lf guide cam A is not more than 56.5 mm apart from rear leg, the
gap between guide cams A and B will be too narrow for knitting
needle.
Note 2: lf the distance between guide cam A and the rear leg exceeds
56.5 mm, the yarn guide might damage the latch.
5. The end needles do not come out.
Selection cam for end needle is broken.
Replace the selection cam for end needle. (Fig. 5).
1. Remove the carriage cover.
2. Remove the end needle selection cam spring.
3. Set the change knob to position 'lN.L.", and remove the guide cam G and F.
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4. Remove the needle selection cam and separation cam.
5. Remove the valve cam F spring and valve cam F.
6. Loose the carriage rear leg clamp screws, and pull off the selection cam for
end needle.
guide cam F
needle selection cam
needle selection change cam
Fig.5
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-5-

!V. HOW TO ADJUST L CARRIAGE.
*Stitch drops
1. Wrong bilateral position of the leaf spring.
1-1. Remove L carriage cover and loosen right and left clamping screws for the
leaf spring.
1-2.8V referring to Fig. 6, place the leaf spring at a distance of 1.0-1.2 mm
inward from the cross section of the plate cam B and fasten with clamping
screws.
2. Wrong vertical position of the leaf spring.
2-1. BV referring to Fig. 7, adjust the tip of the leaf spring to the same level as
that of the plate cam B.
2-2. Although you may use a pincers or pliers in making such adjustment, be
careful not to damage the leaf spring.
Plate cam B
Fig.7
3. Wrong position of the feed hook.
3-1. The feed hook is fixed with the feed hook clamping screw on the side of the
si nker plate.
3-2. Loosen the feed hook clamping screw and move it inward and the mount of
feed will get smaller but move it outward the amount of feed will get larder.
(Fig. 8).
Amount of feed Amount of feed
get larger get smaller
Fig. 8
3-3. By referring to Fig. 9, adjust the feed hook so as to have a gap of 0.2-1 mm
between the crossed catch needles.
0.2-1mm Fig. 9
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-6-

4. When L carriage sinker plate is crooked. (Fig. 10).
4-1. Observe the sinker plate sideward and see if it is crooked.
4-2. After comfirming it by visual observation, put L carriage onto the needle
bed and pull out latch needles to the position D, then check the gap
between the sinker plate and the stem of the latch needles. lf latch needles
are raised by the sinker plate (or there is a wide gap), adjust the "crooked"
section.
This must be
right-angled.
The stem of needles and
sinker plate must be kept
in light contact with each
other. Fis. 10
5. When main cam is replaced.
5-1. Remove right and left clamping screws for the L carriage cover and take off
the cover,
5-2. Remove clamping screws for separation cam and take off the separation cam.
5-3. Remove clamping screws for main cam and take off the main cam.
5-4. From the back side of the L carriage rear foot, measure by use of a sliding
calipers to place main cam in such a way as shown in Fig. 11 and fasten with
three clamping screws.
5-5. Mount right and left separation cam and clamp with screws.
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-7 -

V. NEEDLE SELECTOR MECHANISM (MECHANICAL PART}
Set the change knobto position "KC(ll)", and move the K carriage across and back
slowly and/or quickly to check the needle selector mechanism.
After moving the K carriage to the other side of the machine, all the needles should
be selected to position D.
1. lf some needles do not come outto position D at random.
1-1. Needle is bent.
Replace the needle with a new one.
1-2. The timing belt and the rotary encoder assembly, the rotary encoder
assembly and the rotary cam are not in the right relative position.
Adjust and re-mount them in the right relative position.
(See "Replacing the timing belt and the rotary encoder assembly").
1-3. The card reader guide stopper is not mounted correctly, and the position of
the rotary cam and the rotary cam lever are not correct.
Adjust the position of them.
2. lf some needles do not come out to position D but are selected in eighth or
sixteenth cycle.
2-1 .The rotary cam lever and the needle selector plate (N.S.P.) operation lever
are not in the right relative position.
(Be sure to place the N.S.P. operation lever is on the left side of the rotary
cam lever.)
2-2. Squeezed between the rotary cam lever and the rotary cam lever guide, the
rotary cam lever does not move smoothly. (Fig. 12),
2-3. Squeezed between the armature and solenoid yoke of the needle selector
solenoid, the armature does not move smoothly.
Put the specified grease on the armature sliding parts of the solenoid yoke.
2-4.Ihe spring for the armature is broken.
Replace the spring with a new one.
K carriage movement is too heavy.
3-1. When the K carriage does not move.
The rotary cam lever does not move correctly.
After making sure that the rotary cam lever is not bent, adjust the card
reader guide stopper and the rotary cam position.
3-2. When the K carriage is hard to push.
The clearance between the rotary cam and the rotary cam adjuster collar
is too wide.
Adjust the rotary cam position.
Adjustment.
4-1. Adjustment of the rotary cam lever guide.
1. Remove the pattern card from the card inlet and the needle selectorpanel
assembly.
2. Plug the power supply cord into the AC inlet and the other side of it into
the wall outlet.
3. Turn on the power switch, set the pattern selector to the lower position
and push CF key.
4. Bring back all the needles to position A.
5. Place the K carriage outside of the left turn mark "l C " and set the
change knob to position "KC(l)" or "KC(ll)".
6. Move the K carriage across and back until all the needle selector solenoids
are turned on and the mark sensor is on the left side.
3.
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-8-

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7. Loosen the card reader guide stopper screw and slide the card reader guide
stopper to left until the rotary cam levers touch softly to the right side of
the window of the rotary cam lever guide. (Fig, 13).
8. Fasten the card reader guide stopper screw.
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4-2. Adjustment of the relation between the rotary cam and the rotary cam lever.
1. After adjusting the rotary cam lever guide, loosen the two rotary cam
adjuster collar stopper screws. (The rotary cam slides to right.)
2. Take the clearance of 0.2-0.6 mm (TYP. 0.3 mm) between the rotary cam
and the rotary cam adjuster collar, then fasten the two rotary cam adjuster
coller stopper screws securely. (Fig. 1a).
lf the machine has not got a washer between thw rotary cam adjuster collar
and the rotary cam holder (R), the clearance must be 0.5-0.8 mm (TYP.
0.6 mm).
Note: When adjusting the this item, the encoder board must be mounted.
3. After adiusting the relation between them, turn off the power switch and
set the change knob to position "KC(ll)".
4. Bring forward all the needles to position B.
5. Move the K carriage slowly, all the B position needles must be selected to
position D.
*When the K carriage is hard to push, reduce the clearance between them to
the proper spaces.
*When the needles do not come out to position D, enlarge the clearance
between them to the proper spaces.
-9-

TESTING ELECTRICAL SECTION
VI. CHECKING THE PARTS CONNECTED WITH THE POWER
SUPPLY
1. lnitial live test.
Make sure the power switch is turned off. Plug the power cord into the machine
first then, connect to the main supply. Switch on and check the following.
A. The power supply pilot lamp is lit. (Next to row counter).
B. The buzzer makes a sound.
C. The ready lamp in the pattern case is lit.
D. The mark sensor (Card reader) is in the left hand position.
lf not, it will be turned back to the left position.
Note: This can only be seen with the cover removed.
E. The card feeding dial ratchets and will not feed the card.
F. The number "888" should not flash on and off in the display.
2. Action required for fault symptoms detailed in 1.
2-1. Pilot lamp does not light.
Check and repair by referring to Fig. 15.
2-2. Buzzer does not make a sound.
Short-circuit the anode side (D205) and chassis by using the test lead.
(Fis. 16).
Connect the end of the test lead to the anode side of the diode (D205) and
the other end to the metal parts of the machine body.
lf the buzzer makes a sound, it is working correctly. There are some defects
on the control circuit for the buzzer which is installed on the main P.C.B.
Replace the pattern case whole unit or the main P.C.B, assembly with a new
one.
2-3. The ready lamp does not light.
1. Set the tester to the DCV. 10 range, connect the red terminal of it to the
pin of the red cord and the black terminal to the pin of the black cord.
Check the voltage between the red cord and the black cord of the connector
sl.
lf it is +5V t 5%, there are some defects on the main P.C.B.
Replace the pattern case whole unit or the main P.C.B. assembly with a new
one.
2. lt it is not +5V t 5% (not 0V), replace the power supply board with a new
one.
3. lf it is 0V, check the fuse (F2O2l which is installed on the power supply
board. (Fig. 17).
lf the fuse is not broken, check the voltage between the two red cords of
' the connector S9 of the power transformer.
Set the tester to the ACV. 30 range, and connect the terminal of it to the
pins of the red cord of the connector 59.
lf the voltage between them is AC. 10.6V t 1O%, there are some defects on
the power supply board.
Replace the power supply board.
lf not, there are some defects on the power transformer.
Replace the power transformer with a new one.
4. lf it is 0V and fuse (F202) is broken, replace the fuse lF2O2\ with a new
one and repair the cause of the short-circuit.
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-10_

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CHECKING THE PARTS CONNECTED WITH THE POWER SUPPLY
Fig. 15
Does card dial
ratchet
ls mark sensor
left position
ls ready lamp
ls pilot lamP
See item 2. 2-2.
come to main P.C.B.
Replace main P.C.B.
flash on and off
Check the route between
the A.C. lnput and pilot lamP Check the batteries
ls pilot lamp
See A.C. section Fault repaired
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2-4.fhe mark sensor is not turned back to the left side of the card reader and is
not held in this position.
The card read feeding dial does not ratchet when the power is on.
Check the +5V and +12V powersupply, and ifthere are no defects on them,
there are some defects on the card reader.
Repair the card reader by referring to item X, "Checking and adjustment of
the card reader."
2-5. The number "888" flashes on and off the display when turning on the
power switch.
When the batteries for the protection of the memory have run down to
below 2.6V, the computor makes the number "888" flash on and off in the
display to require the replacement of them.
Check the voltage of the batteries.
Set the tester to the DCV.3 range and connect the red terminal of it to the
(+) siOe and the black terminal to the (-) side of them.
lf the voltage of the batteries is below 2.6V, replace them.
After taking off the batteries and/or fitting the new batteries, program the
initial information by referring to the instruction on page 90.
If the voltage of the batteries is over 2.6V, there are some defects on the
battery checking circu it.
Replace the pattern case whole unit or the main P.C.B. with a new one.
Checking the AC. section.
WARNING: Testing the AC. mains section is dangerous and must be done only
by qualified personel.
3-1. Test the AC. main outlet using an appliances know to be working. eg.
Reading lamp etc. . .
3-2. Testing the mains lead.
This should NOT be connected to supply for these tests.
Test the mains cord for continuity, if it is discontinuous replace with a new
one.
*United Kingdom and lreland specification.
Test the fuse.in the mains plug where fitted, and connections in the plug top.
3-3. Testing the AC. low voltage circuit.
Set the tester to the ACV.30 range, and connect the terminal of the tester
to the pins of the connector S9.
lf the voltage between the two pins of the orange cords of the connector Sg
is AC. 12.6V + 10% and the voltage between the two pins of the red cords
of it is AC. 10.6V ! 1OYo, there are no defects on the AC. input. there are
some defects on the power supply board, therefore, replace the power
supply board with a new one. (Fig. 18).
lf the voltage between the orange cord or the red cords is not correct, the
power transformer has some defects.
Replace the power transformer with a new one. lf the both voltage of the
S9 are not correct. there are some defects on the AC. input.
-12-

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3-4 Checking the AC. input.
AC. input consists of AC. inlet, noise filter board, power switch and power
transformer.
AC. input reduces the voltage of the power supply from the wall outlet and
supplies the reduced voltage to the power supply board.
AC. input and the power supply board are connected to each other with the
connector S9. (Fig. 19).
Fig. 19
Checking the AC. input.
a. Pull out the power supply cord.
b. Set the tester to the Cl x 1 range.
c. Connect both terminals of the tester to both pins of the AC. inlet.
(Fis. 20).
d. Turn on the power switch, the indicator of the tester should show 10O.
There are no defects on the AC. input.
lf the indicator shows 0Sl, there is a short-circuit on the AC. input.
When it shows -S}, the fuse (F601) is broken, the primary winding of
the power transformer or the other cords on the AC' input are
disconnected.
'lr Fig.20
2. Checking the fuse (F601).
a. Disassemble the AC. input. (Fig. 21).
1. Pull out the power cord from the AC. inlet.
2. Remove the three screws forthe needle bed and the three plastic rivets for
the lower side plate (R) assembly.
3. Remove the two screws for the AC. inlet.
4. Take off the lower side plate (R) assembly.
5. Remove the screw of the cord presser plate and take off the cord presser
Plate.
6. Pull out the noise filter board.
b. Check the fuse (F601)which is installed on the noise filter board.
lf it is broken, replace the fuse (F601)with a new one,
After replacing the fuse, find and repair the cause of the defects. Then, turn
on the power switch.
*After replacing the fuse, check the resistance between the both pin of the AC.
in let.
lf the indicator of the tester shows 10Q, the AC. input is working correctly.
There is a short-circuit on the circuit which is worked by the DC power
supply including the power suppply board.
Make sure that the AC. input is working correctly by checking the voltage for
the connector S9.
lf it shows 0O, there is a short-circuit on the AC. input.
lf it shows -O, there are some disconnections on the other circuit of the AC.
input.
ris.21

3. Find out the short-circuit parts on the AC. input.
a. Disconnect the lead wire of the power transformer which is soldered at the
position of BR3 and BL3 on the noise filter board. (Fig.22l.
lf it shows oO, replace the power transformer with a new one.
lf the power transformer is working correctly, check the resistance
between BLl and BR2 on the noise filter board.
lf the indicator shows -C), replace the noise filter board with a new one.
lf the noise filter board is working correctly, check the resistance
between BRl and BLl.
As for AC100V, AC115V and AC127V input specifications, check the
resistance between the pin of the AC. inlet and BR1.
lf the indicator show -O, when turning on and off the power switch,
replace the power switch with a new one.
5. The pilot lamp does not light and the buzzer does not make a sound but the
ready lamp is lit. There are no defects on the AC. input except the output
orange cords of the connector S9 of the power transformer.
Check the voltage between the two orange cords of the connector Sg.
(Fig. 18).
lf the voltage is AC. 12.6V t 1Oo/o, there are no defects on the power
transformer but some defects on the power supply board.
Replace the power supply board with a new one.
lf not 12.6V ! 1oo/o, there are some defects on the power transformer.
Replace the power transformer with a new one.
3-5. Checking the fuse (F601).
The fuse (F601) is installed on the noise filter board which is in the lower side
plate (R) assembly.
The capacity of the fuse is different according to the rated voltage.
Replace the fuse by referring to the indication on the noise filter board.
100V- 115V inputspec. . . . . . . .lAFuse.
127Vinputspec. . . . . . . .0.8A Fuse.
22OV - 240V inputspec. . . . . . . .0.5A Fuse.
After replacing the fuse, find and repair the cause of the defects. Then, turn
on the power switch. lf the fault is still present the fuse will be broken again.
b.
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b. Set the tester to the S/ x 1 range.
Check the resistance between both lead wires
lf it shows 0O, there is a short-circuit on
transformer.
Replace the power transformer with a new one.
lf it shows 10Q, the power transformer is working correctly.
c. Check the resistance between the soldered face of BR3 and BL3.
The indicator shows -C2.
lf it shows 0O, take off the fuse (F601) and check the resistance between
them again.
lf the indicator shows -Sl, the noise filter board is working correctly.
lf it shows 0O, replace the noise filter board with a new one.
. lf the noise filter board is working correctly, check the lead wire of the AC.
input and power switch.
Locate the disconnected parts on the AC. input.
a. Set the tester to the S2 x 1 range.
Check the resistance between BR3 and BL3 on the noise filter board.
The lead wires of the power transformer are soldered to BR3 and BL3.
lf the indicator of the tester shows 10O, the power transformer is working
correctly.
Fig.22
of the power transformer.
the winding of the power
-14-

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How to find the short-circuits which break the fuse (F601).
a. Locate the short-circuit parts on the AC. input circuit by referring to the item
vt, 3,3-4, 3.
b. To locate the short-circuit parts on the power supply board.
1). Pull out the connector 59, S11, and S8 from the power supply board and
the connector Sl and 56 from the main P.C.B.
2). Set the tester to the Sl x 1 range and connect the black terminal of the
tester to No.1 (orange cord) and the red terminal to No.2 pin (black
cord) of the connector S1. (Fig. 23).
3). The indicator of the tester moves to 0Q at first and back to the -O,
Slowly.
lf it does not stop 0S/, there are no short-circuits on the power supply
board.
lf it show 0C2, there is a short-circuit on the power supply board and if
you can not find the short-circuit parts, replace the power supply board
with a new one.
To locate the short-circuit parts on the needle selector solenoids.
Check the resistance of the needle selector solenoids by referring to the item
Vll,2. lf the indicator of the tester shows 0Q, replace the needle selector
solenoid itself or the unit with a new one,
Locate the short-circuit on the stepping motor for card feeding by referring
to the item X,4, 4-2.
4. Checking the DC. section.
4-1. The card feeding dial does not ratchet but buzzer makes a sound.
The power supply pilot lamp and the stepping motor for card feeding are
worked by +12VDC REG. supplywhich is taken from the +12VDC UNREG.
supply.
A fault on the +12VDC REG. power supply could be duetoafaultonthe
supply itself, the +12VDC UN REG. supply or the route between them.
Check this route and ifthere are no defects, replace the power supply board.
*Check the route between the AC. input and power supply pilot lamp.
(Fis. 24).
Fis.24
1. Check the route between the connector S1 and the power supply board.
Pull out connector S1 from the main P.C.B. and turn on the power switch.
Set the tester tothe DCV 30 range and check the voltage of the connector S1,
The voltage between No.4 (red cord) and No.3 pins (black cord) is +5V t 5%
and No. 1 (orange cord) and No.2 pins (black cord) is +12V to 15V. (Fig. 25).
lf No.1 pin
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Fig.23

lf No.1 pin of the connector S1 is not above voltage, check the voltage of the
fuse (F201) which is installed on the power supply board. lf it is correct
voltage, the orange cord is disconnected between the power supply board and
the connector S1.
lf not, the +12VDC UNREG. power supply is not working correctly.
Replace the power supply board with a new one.
*For the AC. 115V input spec. the fuse (F203) is installed on the power
supply board.
Check the fuse (F203), and if it is not defective, replace the power supply
board with a new one. After replacing the power supply board and/or the
fuse (F203), find and repair the cause of the defects.
Then, turn on the power switch.
2. Check the route between the connector P1 and P4 on the main P.C.B.
Turn off the power switch and connect the connector S1 to P1.
Pull out the connector 54 (the lead wire of the stepping motor) from the
main P.C.B. and turn on the power switch.
Check the voltage of No.1 pin of P4 on the main p.C.B. (Fig. 26).
lf the indicator of the tester does not show +12V to +15V, replace the main
P.C.B.
lf the indicator of the tester does not show +12V to +15V, there are some
disconnections on the lead wire of the stepping motor or the connector 54
and P4 are not contacted correctly.
4-2. Checking the circuits which are worked by +5V power supply.
* After replacing the fuse (F2O2l, find and repair the cause of the defects by
referring to the following.
1. To locate the short-circuit parts on the power supply board.
Pull out the connector S1 from the main P.C.B. and check the resistance of
the +5V power supply circuit.
Set the tester to the S) x 1 range and connect the black terminal of it to
No.4 pin of the connector S1 and red terminal to the machine body.
(Fis. 28).
lf the indicator of the tester shows *O, there are no short-circuit parts on
the power supply.
Connect both terminals of the tester reversed, if it does not show osl, there
is no short-circuit on the power supply.
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3. Check the route between the main P.C.B. and the power supply board.
Turn off the power switch and connect the connector 54 to P4.
Pull out the connector 51 1 from the power supply board and turn on the
power switch.
Check the voltage of No.3 of the connector S1 1 . (Fig.27l.
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Fig. 28
-16-

1
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To locate the short-circuit parts on the main P.C.B.
Pull out the connector from the main P.C.B. and check the resistance between
No.4 and No.3 pins of the connector P1.
Set the tester to the O x 1 range and connect the black terminal to No.4 pin and
the red terminal to No.3 pin. (Fig. 29).
lf the indicator of the tester does not show 0O, there is no short-circuit on the
main P.C.B.
CAUTION: Do not connect the terminals of the tester in reverse, it could break
parts of the circuit.
4. To locate the short-circuit parts on the encoder board.
Pull out the connector S10 from the mark sensor and the connector S5 from
the main P.C.B.
Check the resistance between No.l and No.2 pins of the connector S5.
Set the tester to the f2 x 1 range and connect the black terminal'to No.l pin and
the red terminal to No.2 pin of the connector S5,
lf it does not show 0Sl, there is no short-circuit on the encoder board (Fig. 31).
5. To locate the short-circuit parts on the mark sensor. P
Check the resistance between No.3 and No.2 pin of the connector 1310.
Set the tester to the O x 1 range and connect the black terminal to No.3 pin and
the red terminal to No.2 pin. (Fig. 32).
lf it does not show 0O, there is no short-circuit on the mark sensor.
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To locate the short-circuit parts on the left position sensor board.
Pull out the connector 57 from the main P.C.B. and check the resistance
between No.1 and No.2 pins.
Set the tester to the O x 1 range and connect the black terminal to No.1 pin and
the red terminal to No.2 pin. (Fig. 30).
lf the indicator of the tester does not show 0Sl, there is no short-circuit on the
left position sensor board.
Fig.30 Fig. 32
-17-

VII. CHECKING THE NEEDLE SELECTOR SOLENOID
1. Live test for the needle selector solenoid.
Remove the pattern card from the card inlet and turn on the power switch.
Set all pattern variation switch to the lower position.
Set the pattern selector switch to the lower position.
Push the CF key.
The buzzer makes a sound, the card feeding mechanism turns forward and mark
sensor moves to the right side of the card reader.
The card feeding mechanism turns forward one row and the mark sensor turns
back to the left side of the card reader.
The mark sensor is held at the left side of the card reader.
Place the K carriage at the outside of the turn mark "l c " or"l" and setthe
change knob to position "KC(lI)".
Move the K carriage to the other side and bring it back to the starting side.
All the needles should be aligned in position B,
lf there are some defects on the needle selector solenoid unit or its control
circuit, incorrect needle selection appears in the sixteenth cycle.
Check the needle selector solenoids.
Remove the needle selector panel assembly, row counter panel and pattern case
whole unit.
Check the armatures of needle selector solenoids. They must be energised.
(Fig. 33).
Set the tester to the O x 1 range.
Check the resistance between No.9 or No.10 pin of the connector 52 and the
pin of the connector which corresponds to the unenergised armature.
lf the indicator show -S-), there are some disconnections on the solenoid itself
and/or the lead wire of the connector.
Remove the machine body from the carrying case, check the resistance between
the pin of the connector and land to which the wire is soldered at the right side
of the numbered land. (Fig. 35. 36).
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(Fig. 3a).
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energised, check the number of the armature. The
pins of connector 52 and 53 as shown in the figure
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SOLENOID I
SOLENOID 2
SOLENOID 3
SOLENOID 4
SOLENOID 5
SOLENOID 6
SOLENOID 7
SOLENOID 8
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ll SOLENOID
12 SOLENOID
r3 SOLENOID
14 SOLENOID
15 SOLENOID
16 SOLENOID
Fis.34
Armature
Solenoid P.C.B.
Checking the lead wire
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Fig.35
- 18 -

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Fig. 36
lf the indicator of the tester shows *C), the lead wire of the connector is
disconnected.
Replace the needle selector solenoid unit or the solenoid cord with a new one.
lf there are some disconnections on the solenoids, replace the needle selector
solenoid unit or the solenoid with a new one.
lf the needle selector solenoid unit is working correctly, replace the pattern case
whole unit or the main P.C.B. assembly with a new one.
3. There are some needles selected to position D.
There are some defects or poor adjustment of the position sensors.
Check the right and left position sensor by referring to the item lX.
!IX. CHECKING THE PATTERN CASE
(except the variation switches)
1. Check the display. ,
Push the "8" key three times.
The buzzer makes a sound and the number 8 appears in the display whenever it
is pushed.
2. Check the CE key. (Ce . . . Clear Entry)
Push the CE key.
The buzzer makes a sound and the number in the display resets.
3. Check the numeral keys.
Push the numeral key in order, the number of the pushed key appears in the
right side of the display.
The computor will only accept a maximum of 3 key entrys. Push the CE key to
clear the display, then continue to check the numeral keys.
The buzzer makes a sound whenever the key is pushed.
4. Check the CR key. (Cn . . . Correction)
Push the CR key.
Error lamp is flashes on and off.
Push the CE key.
Error lamp will go off.
5. Check the CF key and RR key. (CF . .. Card feed, RR. . . Return & Reset)
*The CF key.
Push the CF key.
The card feeding mechanism turn forwards and mark sensor moves to the right
and then comes back to the left side of the card reader.
Note: The CF key can not be operated repeatedly. lf the CF key does not
work, operate it after pushing the RR key.
*The RR key.
Push the RR key.
The card feeding mechanlsm turns backward.
6. Check the M key and the step lamp. (M . . . Memory)
Push the M key.
The ready lamp goes off and the pattern selector lamp is lit up.
Set the pattern selector switchto the middle position (A+B) and push the M key.
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