Bernina Activa 125 Bedienungsanleitung

Attention!

All electrical and electronic components operate at

dangerous voltages. The mains plug must be withdrawn

before making any adjustments to the machine.

Wait about 30 seconds after removing the plug (capacitor

discharge).

The service manual is intended to help with small repairs

and adjustments. The instructions lay no claim to comple-

teness. They are not suitable for a complete assembly or

disassembly procedure.

Important:

To enable the work described to be performed correctly,

the sewing machine must be in good mechanical and

electrical condition (running smoothly, properly oiled and

all plugs in position). When the adjustments are carried

out in the correct order, the machine will sew perfectly.

When doing any service on a machine always use the

original accessories that were delivered with the machine,

or were purchased afterwards. These are the following:

– Mains cable

– Foot control unit

– Buttonhole foot

– Bobbin case with bobbin

– Other accessories

This manual is copyrighted. It is given to the recipient

personally. Without our approval it is forbidden to

reproduce, publish or in any other form be distributed,

memorised on a magnetical, electronical, mechanical

system. Further, information to a third party without our

written approval is prohibited.

This manual is an ever changing document. The recipient

is responsible for updating the information which he will

receive from Fritz Gegauf Ltd. Switzerland.

Impressum

Author: P. Kenyon, V. Häseler

Layout conception: Melzer-Müller id, Kreuzlingen

Typesetting /DTP: Silvia Bartholdi

Print: Bodan AG, Kreuzlingen

Safety Regulations

2 Contents

Technical data 3, 4

Service Panel 4

Tools & Gauges 5

Electronic

•Description 6

•Block diagram 7

•L-Print 8

•S-Print 9

•Diagnosting 10

•Powering of the stepping motors 10

•Bevore service or repair work carried out 10

•Protection of electrical components against

electrostatic discharges 10

Service Programme

•Start/Stop the service programme 11

In Basic Service Programme

•Configuration 11

•Foot control unit 11

•P-Print (Positioning) 12

•Bobbin winder motor 12

As a programme

LCD Function of the LCD display 13

No.1 Sewing-off 13

No. 2 Forward/Reverse feed compensation 13, 14

Test Buttonhole 14

No. 3 Automatic darning 15

No. 4 Software version 15

No. 5 Number of hours sewn 15

No. 6 Maximum speed regulation 16

No. 7 Stepping motor test stitch width 16

No. 8 Pinning position of both stepping motors 17

No. 9 Stepping motor test stitch length (SL) 17

No. 10 Displaying the actual speed 18

No. 11 Displaying the factor of speed regulation 18

No. 12 Start/Stop function 19

No. 13 Testing both stepping motors (SL and SB) 19

Testing ribbon cables 20

Functional inspection 21

Removing covers 22, 23

Cleaning 24

Exchanging parts

•S-Print 25

•Buttonhole sensor 25

•L-Print 26, 27

•Main motor 27

•Stepping motor SB 28

•Stepping motor SL and crank shaft 28

•Bobbin winder motor 29

•Base shaft 29

•Hook race ring 30

•Tension unit 30

•Take-up lever 31

•Main shaft 32

Adjustments

•Belt tension main shaft/main motor 33

•Belt tension main shaft/base shaft 33

•Bobbin winder device 34

•Presser foot fixation 34

•Head frame plate 34

•Presser foot height 35

•Darning foot height 35

•Drive position in the hook race 36

•Distance needle/hook 36

•Needle position zig-zag 36

•Position of synchronisation disc 37

•Feed-dog position in the stitch plate 37

•Height of the feed-dog 38

•Thread passage play 38

•Thread guide plate 39

•Loop lift 39

•Position of Hook/Driver 40

•Needle height 40

•Feed-dog Synchronisation 41

•Basic setting of balance 41

•Knee lifter unit (accessory) 42

•Lower thread tension 42

•Upper thread tension 43

•Adjustment of upper thread tension with a weight 43

•Tension release lever 44

•Thread regulator spring 44

Oiling and Lubrication 45

Sewing-off 46

Cleaning 46

Complaints form 46

Complaints report: Appendix

Marina's Little Shoppe on eBay

3Technical data BERNINA activa series

activa 135

0,15

5,5

0,23

Yes

on screen

Yes

mechanical

Yes

BERNINA

optional

Rubber pad

LCD

60 x 40

symbolic

Yes/LED

partly

Yes

activa 145

0,15

5,5

0,23

Yes

50 (+ 60 charac.)

Yes

on screen

Yes

mechanical

Yes

BERNINA

optional

Rubber pad

LCD

60 x 40

symbolic

Yes/LED

partly

Yes

Features (Stitches)

Stitch length forwards in mm

Increment in mm

Stitch length reverse in mm

Stitch width in mm

Increment in mm

Needle positions

Buttonhole types

Darning programme

Functions by stitch counter

Buttonhole: length measurement

Total practical stitches

Total decorative stitches

Alphabets and numbers

Total number of stitches

Functions

Automatic basic settings

Optimum settings displayed

Selected stitch function

Clear (clr) button

Balance

Pattern end

Mirror image (lateral)

Permanent reverse sewing

Memory (mem)

Permanent save

Hopper mechanism

Presser foot attachment

Adjustable presser foot pressure

FHS presser foot lifter

Operating controls

Buttons

Screen

Size in mm

Type

Background lighting

Direct stitch/function selection

Stitch width indicator beam

Stitch length indicator beam

Integrated service programme

activa 125

0,15

5,5

0,23

Yes

on screen

Yes

mechanical

Yes

Snap-on

optional

Rubber pad

LCD

60 x 40

symbolic

partly

Yes

activa 125

80W

DC/65W/24V

120–900/min

up & down

Yes

160 x 110 (192)

345

176

307

12V/5W

1 x 5W

7,5 mm

Yes

** Optional

BERNINA-CB

130/705H

130/705H TCN

ca. 9,6 kg

4Technical data BERNINA activa series contd.

Drive unit/power unit

Power max.

Motor

Sewing speed S.p.m.

Needle stop

Needle stop via foot control

* optional with virtuosa foot control

Roll-up foot control cable

Main power switch

Construction/housing

Through space (diagonal) in mm

Overall length in mm

Overall width in mm

Overall height in mm

Sewing light voltage

Bulb

Presser foot height in mm

Drop feed-dog mechanism

Drop feed-dog via FHS

** possible with added FHS

Hook system

Needle system

Adjusting needle

Weight (excl. accessories)

activa 135

80W

DC/65W/24V

120–900/min

up & down

Yes

160 x 110 (192)

345

176

307

12V/5W

1 x 5W

7,5 mm

Yes

** Optional

BERNINA-CB

130/705H

130/705H TCN

ca. 9,6 kg

activa 145

80W

DC/65W/24V

120–900/min

up & down

Yes

160 x 110 (192)

345

176

307

12V/5W

1 x 5W

7,5 mm

Yes

** Optional

BERNINA-CB

130/705H

130/705H TCN

ca. 9,6 kg

Service Panel

The following tools and gauges are necessary:

TORX-Screwdriver (Commercially available):

Nr. 6, 8, 9, 10, 12, 15, 20, 25

Not available from BERNINA!

Tools

Circlip mounting tool Spring mounting tool

398 112.030

398 083.030

Rectifying tool

398 097.030

Torx Srewdriver

T10s

030 475.50.00

Eccentric Key

001 361.70.00

Rectifying tool

(Hook/Driver-Play)

001 357.70.00

Lower tension

001 358.70.00

Upper tension

398 080.040

Pinning tool

(Looplift)

030349.70.00

Pinning tool

(Stepping motor/Drive crank)

001 356.50.00

Pinning tool

(Stepping motor/Drive crank)

002 733.50.00

Hook race gauge

006 765.71.00

Buttonhole filter

008961.70.00

Presser foot height

6,0/8,5 mm

398 031 133

Torx-Screwdriver

TX8z

007 993.50.00

Feed-dog height

0,9/10 mm

398 024 030

Feeler gauge 0,3 mm

(Hook/Driver-Play)

398 022.030 (0,3 mm)

398 111.030 (0,15 mm)

Pinningtool

(Stepping motor stitch length)

030 652.50.00

The electronics of the BERNINA activa are basically

contained in two modules (printed circuits), namely on the

power L-print and the S-print (see block diagram).

Power supply L-print

The power L-print is mounted at the rear of the sewing

machine. The circuits produce the following direct current

voltages:

•5 V/DC for the logic on the S-print.

•12 V/DC for the sewing light.

•30 V/DC for the drive motor, bobbin winder motor and

stepping motors.

•16 V/DC for motor control on the S-print.

In case of malfunction, the fuse F-4A-T protects the parts

against overload. If a fuse blows, only an original replace-

ment with the correct ratings must be used.

S-print

The S-print is assembled with the latest SMD (Surface

Mounted Device) technology. SMD components allow a

very compact type of circuitry.

SMD prints cannot be repaired with conventional tools!

The micro-computer on the S-print receives an analogue

signal from the foot control which is converted into a digital

signal and given as a nominal value. When the foot control

is released (nominal value zero) the micro-computer

switches on the electric brake. The motor is stopped very

quickly in the required needle position.

When the sewing machine is switched on the stepping

motors are in any given position. There can also be any

given value in the memory of the micro-computer. So that

a defined basis is achieved, the stepping motors are

positioned by means of a signal from the micro-computer.

This position is then registered and set at zero in the

memory of the micro-computer. It is then possible to select

and sew any given stitch from this zero position.

The S-Print controls the functions of the stepping motors

to one another, calculates the signals of the sensors, com-

piles the results and displays them on the screen.

Integrated on the S-Print are the display, P-Print and

return button.

Description of the electronics

7Block Diagram

Display

Return-Button

Phototransistor and LED

Command circuit Power cirguit

Mains voltage

Foot control

Sewing light

Main motor

Bobbin winder

Stepping motor stitch width

Stepping motor stitch length

Buttonhole sensor

white

yellowwhitewhiteblackblueyellow

8 L-Print

Line Voltage!

9S-Print

Stitch width

black

4-pole

Spuler

white

4-pole

Sewing light

yellow

2-pole

Buttonhole sensor

yellow

4-pole

Stitch length

blue

4-pole

Main motor

white

2-pole

L-Print

white

8-pole

Foot controler

Marina's Little Shoppe on eBay

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