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Manuals
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Bernina Manuals
Sewing Machine
7 Series
Service and maintenance manual
Bernina 7 Series Service And Maintenance Manual
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Also See for 7 Series
:
Workbook
(54 pages)
,
Manual
(196 pages)
,
Service and maintenance manual
(225 pages)
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
Chapter 1 - General Information
Safety Regulations
Warning: Dangerous Voltage Levels
ESD-Related Note: Electrostatic Discharge (ESD)
Tools and Gauges
Handling Adjustments
Abbreviations / Names Used
Cleaning
Technical Details of the New 7 Series
Chapter 2 - Electronics and Wiring
PCBA-Base - General Information
PCBA-Base (B790, B770, B740, B720)
PCBA-CPU-Module (ARM9) - General Information
PCBA-CPU-Module / ARM9 (B790, B770, B740, B720)
Pcba
PCBA Left Front Cover (B790, B770, B740, B720)
PCBA Right Front Cover (B790, B770, B740, B720)
PCBA-Power (B790, B770, B740, B720)
PCBA-Threader (B790, B770, B740, B720)
PCBA-Dual-Feed Sensor (B790, B770, B740)
PCBA-Position (B790, B770, B740, B720)
Pcba-Ret (B790, B770, B740, B720)
PCBA Feed-Dog Drop Detection (B790, B770, B740, B720)
PCBA-Lower-Thread Observer (B790, B770,B720)
PCBA-Accessories Connector
PCBA-Presser-Foot Height Sensor (B790, B770, B720)
Sensor Support ABC (Presser Foot Recognition) (B790, B770, B740, 720)
Cable Harness
BERNINA 790 Block Diagram (B770, B740, B720)
Handling of Electronic Components
Returning Defective Electronic Components
Repairs of Electronic Components (Pcba's)
Chapter 3 - Removal and Refitting of Components
Covers
Head Cover
Rear Cover
Front Cover
Free Arm Cover
Free Arm Cover Plate
Base-Plate Cover
Belt Cover
Electronics and Sensors
Front Left and Front Right PCBA-Covers
Stitch-Length and Stitch-Width Adjusting Knobs
Winder Unit
Winder Motor
LC Display / Touchscreen
PCBA-RET / Rubber Key Pad / Ribbon Cable
PCBA-Base
PCBA-CPU-Module
EEPROM (Electrically Erasable Programmable Read-Only Memory)
Freearm LED Sewing Light
PCBA-Power Including PCBA Housing
PCBA-Power
Head Frame LED Sewing Light
Presser-Foot Height Sensor
PCBA-Threader
Sensor Support ABC (Presser-Foot Recognition Sensor)
PCBA-Dual Feed Sensor
PCBA-Accessories-Interface
Embroidery Module Interface (BERNINA 780 and 750)
PCBA-Lower-Thread-Sensor
Mechanical Components
Hook and Hook Driver
Stitch Plate Support with Integrated Thread Cutter Unit
Blade Change on Mounted Thread Cutter Unit
Thread-Tension Unit
Mechanical Basic Setting of the Thread Tension
Clutch Carriage
Threader Head
Needle Bar Support
Needle Bar
Needle Clamp
Threader Mechanism
Main Motor
Dual Feed
Thread Take-Up
Restraint Guided Feed Advance Link Lever
Stitch-Length Crankshaft
Base Shaft
Stitch-Length Stepping Motor
Sideways-Motion Stepping Motor (B780)
Presser-Foot Pressure Stepping Motor
Stitch-Width Stepping Motor
Presser-Foot Pressure - Toothed Rack Bearing
Chapter 4 - Settings
Basics - General Information
Belt Tensions
Upper / Base Shaft Tension
Drive Motor
Head-Frame Plate Position
Position of Head-Frame Plate/Stitch Plate in y Direction
Position of Head Frame Plate/Stitch Plate in X-Direction
Presser-Foot Settings
Darning Foot Height
Presser-Foot Fixation
Needle Settings
Distance between Needle Bar and Presser-Foot Bar
Needle Distribution
Zigzag Stitch Width Limiter
Hook, Needle Drive and Feed-Dog Movement Synchronization
Feed-Dog Lift and Advance (Synchronization of Base Shaft and Main Shaft)
Loop Lift
Needle / Hook Distance
Needle Penetration in y Direction
Needle Height
Feed-Dog Settings
Position of Main Feed-Dog Within Stitch Plate in X Direction
Dual Feed: X-Direction Positioning against Main Feed-Dog
Leveling of Main Feed-Dog (0.9-1.0Mm)
Main Feeding Balance - Mechanical Basic Setting
Feed-Dog/Dual Feed Synchronization
Dual Feed Balance - Basic Mechanical Setting
Clutch Carriage / Thread Cutter
Clutch Carriage Solenoid
Clutch Carriage
Timing of Clutch Carriage
Thread Cutter
Synchrinising Disc
Rough-Adjustment
Fine-Adjustment
Threader
Basting Device
Needle Bar Guide
Checking the Timing of Disengagement
Thread Regulator
Thread Tension
Upper-Thread Tension
Lower Thread Tension (Basic Setting)
Winder
Lower-Thread Sensor Position
Chapter 5 - Service Program
Menu 1 - Service Information
Machine Basic Data
Machine Soft- and Firmware Data
Machine Operating Time Data
Machine Stitch Counter Data
BSR (BERNINA Stitch Regulator) Data
Machine Servicing Data
Saving / Loading Customer Data
Customer Data
Dealer Data
Log File
Menu 2 - Display, Buttons
What to Test
Touchscreen Calibration
LC Display (Screen)
Blank Dark LC Display (Screen)
Blank White LCD (Screen)
RGB (Red, Green and Blue) Screen
Keyboard Lights
Led's and Brightness
Menu 3 - Sensors (Mounting Locations in the Machine)
What to Test
Threader Sensor
Overlift Presser Food Switch (Presser Foot Height Sensor)
Lower-Thread Sensor
Feed Dog Drop
Dual Feed Recognition Sensor
Bobbin Winder Switch
Free Hand System FHS
Menu 4 - Signals
What to Test
Stitch Width and Stitch Length Knob(S)
Functions of Keys and Buttons on Machine
Start-/Stop Slide (SSU)
Foot Control
PS2 Interface
Upper Thread Sensor
BERNINA Stitch Regulator (BSR)
PCBA-Position
Mechanical Fine-Adjustment of Synchronization Disk
Speaker
USB Host Interface
Basting Solenoid
Presser-Foot Recognition
For Example
BSR Foot Interface
Menu 5 - Stepping Motors (Mounting Locations in the Machine)
What to Test
Stitch Width Stepping Motor
Presser-Foot Pressure Stepping Motor
Upper Thread Tension Stepping Motor
Pinning Positions of All Stepping Motors
Bobbin Winder Motor
Stitch Length Stepping Motor
Sideways Motion Stepping Motor
Menu 6 - Adjustments
What to Test
Sewing-Off (Customer's View)
Balance
Rough Adjustment
Fine-Adjustment
Fine-Adjustment (Sideways Feed)
BDF Balance
Buttonhole Calibration
Thread Cutter Clamping Mechanism (Magnet)
Thread Cutting Process
Upper-Thread Tension Reset to Default
Resetting to Factory Settings (Reset All)
Presser-Foot Height and Presser-Foot Pressure
Automatic Upper-Thread Tension
Start-/Stop Unit (SSU) Slide Control Calibration
Normal SSU Sewing Speed
BSR Sewing Mode
Menu 7 - Embroidery Module (EMB)
What to Test
Menu 11 - Check out
What to Test
Important
Check-Out Tests
Chapter 6 - Lubrication Diagram
Chapter 7 - Firmware Update
Update Procedure
Update - Alternative Access
Chapter 8 - Maintenance Guidelines
Purpose of the Maintenance Guidelines
Explanatory Notes on the Stitch- and Hour Counter
When Is a Cleaning Message Displayed
When Is a Maintenance Message Displayed
How Are the Stitches Counted
Implementation of the Maintenance Intervals
Maintenance Intervals
Cleaning- and Service-Stitch Reset
Wear-And-Tear-Parts Definition
Non-Hour-Related Parts
Operating-Time-Related Parts
Maintenance Checklist
Measures to be Taken before the Maintenance
Measures to be Taken after the Service
Functional Check
Maintenance Checklist BERNINA 790 / 770 / 710 / 720
Embroidery Module
Document Revision History
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Service- and Maintenance Manual
BERNINA 790
BERNINA 770
BERNINA 740
BERNINA 720
BERNINA International AG
Seestrasse 161
CH-8266 Steckborn
Switzerland
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This manual is also suitable for:
790
740
770
720
770 qe
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