Description
Overview
Replacement control board for Dayi 2106 and 6802 brushless electric wrenches, combining the speed switch with the motor drive circuit. Order by wire count and capacitor value: 8-wire 220UF 35V, 9-wire 330UF 35V, or a switch version at 36V or 42V.
Specifications
- Fits: Dayi 2106 and 6802 brushless wrenches
- 8-wire board: 220UF 35V capacitor
- 9-wire board: 330UF 35V capacitor
- Switch versions: 8-wire 36V, 9-wire 42V
- Type: speed switch and drive board
Purpose
A wrench that stutters, skips speeds or dies under load usually fails at the board, not the motor. Matching wire count and capacitor value keeps the repair electrically correct.
Applications
- Dayi 2106 board replacement
- Dayi 6802 board replacement
- Speed and trigger fault repair
- Brushless wrench rebuilds
- Spare boards for the shelf
How to Use
- Pull the battery and let the tool cool.
- Count the wires and read the capacitor marking on the old board.
- Note the lead positions, then desolder the battery, motor and switch.
- Fit the new board and check every joint for bridges before assembly.
- Caution: the 36V and 42V switch versions do not interchange. Match the rating to the pack voltage.
















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Use our practical guides for current and wire selection, connector validation and OEM harness drawings.




























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