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Ho Hsing HVP-90 Control Board Presser foot problem solve | Ho Hsing HVP-90 Control Board Repair Ho Hsing HVP-90 Control Board Presser foot problem solve Ho Hsing HVP90 কন্ট্রোল বোর্ড: প্রেসার ফিড ঝাঁকাঝাঁকি সমস্যা সমাধান।Fixing Ho Hsing HVP90 Control Board: Unstable Pressure Feed knife & presser foot pressure + - ho hsiimg i60-7, ho hsing control box reset, ho hsing gd-60 control box programs, ho hsing control box w51 resat, ho hsing control box, ho hsing control box error code, ho hsing control box pdf, ho hsing control box manual, ho hsing control box pdf download, ho hsing control box knife adjust, huatang control board error 5 remove, knife & presser foot pressure + -, sewing machine control board error 5, sewing machine huatang control board error 5 remove Initial Checks Mechanical and Power Mechanical Linkage: Check the physical connection between the presser foot lifter mechanism on the machine head and the solenoid (actuator) connected to the HVP-90 control box. Ensure the linkage is not jammed, bent, or disconnected. Solenoid Power: The HVP-90 has an output for the presser foot solenoid. Check if the solenoid is receiving power (often 24V or 30V DC, which may be selectable via a jumper on the main board) when the foot pedal is heeled back or the corresponding button is pressed. If no power, the issue might be the control board's solenoid driver circuit or a faulty cable. Treadle/Pedal Adjustment: The presser foot lift is often activated by the heel-back motion of the foot pedal/treadle. Check the adjustment of the rod (D) and bolt (B) in the speed control unit (under the table) to ensure the treadle stroke and heeling backward force are correctly set. Improper adjustment can prevent the sensor from registering the heel-back position, or not actuate the mechanical linkage fully. Control Board Parameter Checks The HVP-90 uses programmable parameters to control the presser foot lifter (if it's an automatic lift model). You'll need to enter the parameter mode to check these settings. Presser Foot Lifter Function (Parameter HHC or similar): Look for a parameter that controls the presser foot lifter function. The manual references a parameter HHC, which cancels the foot lifting at half-heeling pedal. Ensure the parameter for enabling the automatic presser foot lift is set correctly (often a '1' for enabled). Machine Code (Parameter Cnnn): The control box must be set up with the correct machine code to activate all features, including the presser foot lifter, for your specific sewing machine model. A wrong machine code can disable functions. Caution: Only adjust parameters if you have the full manual and understand the function. Incorrect settings can cause abnormal operation Error Codes Check the LED display on the control box for any error codes. While presser foot problems don't always trigger a code, an error related to the main motor or other components could indirectly affect the solenoid operation. Common Ho Hsing error codes include: Error 01 or 02: Often related to the synchronizer (sensor on the handwheel/pulley) or its connection. A synchronizer issue can affect positioning and may interfere with functions dependent on needle position, like the presser foot lift timing. Error 07: This is typically a power transistor (IPM/Power Module) or over-current error, a serious issue that will disable all functions. Solving presser foot issues sometimes requires a reset of all parameters to factory defaults, followed by reprogramming the correct machine code and specific functions, which you can see a demonstration of in the video below. For more in-depth guidance on control board adjustments and resets, you may find this video on How to Ho Hsing Control Box HVP-90 Reset helpful Ho Hsing HVP-90 Control Board Presser foot problem repair, Hvp 90 control board foot problem solve,Ho Hsing HVP-90 Control Board Presser foot, HVP-90 Control Board Presser foot problem solve,Ho Hsing HVP-90 Control Board Presser foot setting,Ho Hsing HVP-90 Control Board foot Presser problem solve