This document is a service manual for the 555 QE sewing machine, providing detailed instructions for adjustment, maintenance, and troubleshooting. It covers various mechanical and electrical components, aiming to ensure the machine operates correctly and efficiently.
Function Description:
The 555 QE is a sewing machine designed for various sewing tasks, including straight stitching, zigzag stitching, and automatic buttonholes. It features a rotary hook system for thread management and a feed dog mechanism for fabric movement. The machine incorporates stepping motors for precise control over feeding and zigzag operations, as well as an auto needle threader for user convenience. Tension control for both upper and bobbin threads is adjustable, allowing for optimal stitch quality across different fabric types and thread weights. The machine also includes an LED lamp for illuminating the sewing area and a display for pattern selection and status indication.
Important Technical Specifications:
- Presser Bar Height: Standard height of the presser foot is 6.0mm. Adjustment involves loosening a hexagon screw on the presser bar guide bracket and setting the lifting height to 6.0mm.
- Needle Bar Height: The sharp point of the needle should touch the bottom surface of the rotary hook when lowered to its lowest position. Adjustment is made by loosening a hexagon screw on the needle bar rod link and repositioning the needle bar.
- Needle Drop Position: For zigzag stitch No. 006, the needle should be centered in the needle plate hole, with 3.5mm clearance on each side. Adjustment involves loosening a hexagon screw on the needle bar crank and using a flathead screwdriver to adjust the zigzag eccentric pin.
- Height of Feed Dog: When the feed dog starts to move, its height should be 0.9mm, rising to a maximum of 1.1mm at its highest position. Adjustment is performed using a flathead screwdriver on the feed regulate screw.
- Transmission of Feed Dog: The feed dog transmission should occur between 0-1mm when the needle moves down from its highest position. Adjustment involves loosening a hexagon screw on the feed cam and moving the cam up or down to align with the standard position mark on the shaft.
- Needle Clearance in Rotary Hook: The distance between the needle (HA-1 #14) and the rotary shuttle sharp hook should be 0.05-0.1mm. This is adjusted by loosening a hexagon socket screw and moving the needle bar crank.
- Timing of Rotary Hook: The needle must be at a proper position relative to the rotary shuttle hook tip. This is checked with pattern No. 002 (straight stitch, left position) or stitch width "0" for pattern No. 006. Adjustment involves loosening hexagon screws on the lower shaft gear and repositioning the gear.
- Positioning of Bobbin Case: There should be a 1mm gap between the bobbin case and the stop shrapnel holder (C2900-023/730152). The bobbin case stop plate (730151) is adjusted to ensure a 3.7mm gap as per the standard figure.
- Upper Tension Dial: Standard tension range is 35-40g when the tension dial is set at level 4. Adjustment involves turning the tension regulator (A) manually.
- Bobbin Case Tension: Standard tension range is 15-18g. Adjustment is made by turning the regulating screw (A) on the bobbin case with a small flathead screwdriver.
- Auto Needle Threader: The hook of the auto needle threader must correctly enter the needle eye to thread the needle. Adjustment involves loosening a hexagon screw on the through thread location plate and moving the plate up or down.
- Stepping Motors: The machine uses stepping motors for feeding (128082) and zigzag (128131001/T1354886) operations.
- Circuit Boards:
- LED Lamp: 5K02W-07
- Display & Control Board: PC2-11K23
- Power Circuit Board: PC1-5K02P
- Main Circuit Board: PC-2 (11K23M)
- Motor: M-4M627GS Motor 220-240V.
Usage Features:
- Pattern Selection: The machine allows for selection of various patterns, including straight stitch (e.g., No. 002), zigzag (e.g., No. 006), and automatic buttonholes.
- Stitch Width Adjustment: Stitch width can be adjusted, for example, to 3.5 for centering the needle.
- Hand Wheel Operation: The hand wheel is used to manually control needle movement, allowing for precise positioning during adjustments and delicate sewing tasks.
- Presser Bar Lever: A lever is provided to lift the presser bar, facilitating fabric placement and removal.
- Auto Needle Threader: This feature simplifies the process of threading the needle, improving user convenience.
- Buttonhole Lever: A dedicated buttonhole lever is used in conjunction with buttonhole patterns for automatic buttonhole creation.
Maintenance Features:
- External Cover Access: The manual details how to open the face cover, front cover, and rear cover to access internal components for maintenance and repair. The face cover must be opened first.
- Starting Point Adjustment: If patterns are sewn differently from standard or the stepping motor fails to sense the starting point, the main circuit board or stepping motors may need replacement. Fine adjustment of the starting point for patterns (e.g., pattern No. 082) can be done by loosening/tightening screw (A) and adjusting screw (B) with a Phillips screwdriver.
- Circuit Board Replacement: Instructions are provided for troubleshooting and replacing specific circuit boards:
- LED lamp (5K02W-07) for lighting issues.
- Display & control board (PC2-11K23) for display or control button unresponsiveness.
- Power circuit board (PC1-5K02P) for general power issues where the machine has no response.
- Stepping Motor Replacement: Detailed steps are given for changing the feeding stepping motor (128082), including loosening screws, replacing the motor, and regulating its starting point by aligning gears and securing screws.
- Auto Buttonhole Adjustment: Troubleshooting for buttonhole presser foot sensing issues or incorrect buttonhole shapes involves adjusting the buttonhole switch case (128024) by loosening its screw and moving it backward or forward.
- Motor Belt Adjustment: To address loose motor belt tension, screw (A) on the motor bracket is loosened, the motor bracket is moved up or down to achieve proper tension, and then screw (A) is tightened to secure the motor.
- Tool Requirements: The manual specifies various tools needed for maintenance, including 2.0mm, 1.5mm, and 2.5mm hexagon screwdrivers, flathead screwdrivers, a 7.5mm nut driver, a Phillips screwdriver, a tension meter, and a specialized gauge for measurement.
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