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General| Brand | Husqvarna |
|---|---|
| Model | 6690 |
| Category | Sewing Machine |
| Language | English |
Requirements and action for inspecting and replacing the stitch plate.
Requirements and action for inspecting and replacing the presser foot.
Requirements and action for inspecting and replacing the feed dog.
Information on cleaning and potential exchange of the bobbin case.
Requirements for the hook cover and action if damaged.
Requirements for the hook, with action for exchange if damaged.
Requirements for the driver and steps for its exchange.
Information on cog belt tension and adjustment.
Information on V-belt tension and adjustment.
Details on dismantling, mounting, and checking the reduction gear.
Checks for connections and cables on the terminal board.
Checking the motor's function and steps for its dismantling.
Requirements for the foot control and actions if faulty.
Guidance on required settings for various fabrics and fabric combinations.
Description and ordering numbers for various setting gauges and service tools.
List and descriptions of specialized tools required for servicing.
Details and ordering numbers for a comprehensive tool set.
Procedure for checking and adjusting axial play in the arm shaft.
Procedure for checking and adjusting axial play in the lower shaft.
Checking and adjusting the zig-zag movement of the needle.
Setting the needle to be centered in the stitch plate's needle hole.
Adjusting the needle's position relative to the feeding direction.
Adjusting the stop to prevent needle movement outside the stitch plate.
Checking and adjusting the gap between the hook and the needle.
Procedure for setting the timing of the hook relative to the needle.
Adjusting the gap between the hook cover and the driver.
Setting the upper position of the needle bar for correct hook-needle gap.
Instructions for fixing and positioning the stitch plate correctly.
Ensuring the feed dog is parallel to the stitch plate groove.
Adjusting the lateral position of the feed dog in the stitch plate groove.
Ensuring the feed dog does not strike the stitch plate.
Checking the feed dog lift height using a gauge.
Checking and adjusting the feed dog's 'after-feed' movement.
Adjusting the feed dog support to ensure normal sound.
Setting the presser bar so the needle hole aligns with the stitch plate hole.
Adjusting the pressure exerted by the presser foot on the fabric.
Adjusting the lever that releases upper thread tension.
Adjusting the upper thread tension knob for proper take-up.
Checking and adjusting the thread take-up spring.
Setting the adjustment casing for the thread take-up spring.
Testing and adjusting the thread tension of the bobbin case.
Balancing forward and reverse feed for buttonholes.
Summary of checks performed using the service cassette.
Procedures for driving, removal, and assembly of the motor's speed control.
Setting and adjusting the minimum speed of the motor.
Explanation and adjustment of the machine's homing speed.
Adjusting the needle's stop position at the upper limit.
Step-by-step guide for removing the step motor.
Procedure for pre-setting the step motor before mounting.
Instructions for mounting the step motor within the feeding movement guide.
Procedures for removing and installing the arm shaft circuit components.
Preliminary and fine adjustment of the needle's side movement.
Detailed steps for dismounting the step motor and related parts.
Pre-setting the step motor for guiding the feeding movement.
Instructions for mounting the step motor within the feeding movement guide.
Preliminary adjustment of the feed dog movement relative to the needle.
Fine-tuning the feed dog movement for accurate after-feed.
Instructions for mounting the cable holder, flat cable, and printed circuit.
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