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1%イントロ・ヒストリー:USB Power for Remington MB4040.

- Make A. Mendによって編集

承認済みの編集 : Make A. Mend

前
後
変更なし
デバイス
Remington MB4040
Type
replacement
Thing
Battery and Wall Power Adapter
Title
Power Remington MB4040 with USB connector
Introduction
== '''WHY I DID THIS''' ==
* I love the shaver, but got tired of replacing it every time the rechargeable battery failed. Shaving only half my face before the battery died was not acceptable to my girlfriend, even if I could shave the other half once the battery charged again. ;-)
* I don’t need the rechargeable feature, so modified the electronics to work on power from a USB connector.
== '''NOTE''' ==
* This solution will requires the shaver to be plugged in while shaving (and unplugged afterwards).
* The switch and LED will no longer function.
== '''SKILLS''' ==
* unsoldering devices from a PCB board,
* soldering wires together and to a PCB board,
* using heat-shrink tubing or electrical tape.
* measuring DC voltages.
== '''WARNING''' ==
* I make no commitments that this approach is safe.
* This is strictly a guide of what worked for me and works fine for me.
* Do not eat or inhale any of the small parts in your shaver or on the PCB board. They will make you sick and possibly worse!
== '''REPAIR STRATEGY''' ==
* Convert power source from AC to DC (USB wall adapter).
* Remove battery and unnecessary electronics on PCB.
* Cut off old power adapter and keep the cable (with the shaver connector).
* Cut off non-USB-A end of a USB-A cable and keep the USB-A end.
* Connect the old power cable (with shaver connector) to the USB-A cable.
== '''REPAIR THEORY''' ==
* To figure out power levels, I measured the battery voltage after charging. It was 4.0 VDC. I also measured the current draw which was 101mA.
* Since the device came with an AC charger, I planned to replace it with a DC usb adapter which provides 5VDC.
* I empirically tested that with one forward diode drop I could get the the motor running at same 4.0 VDC and 101mA current
* To maintain connection to the shaver through the old power cable, I needed to leave the PCB fixed in place, but removed most of the rectification diodes except one. That extra diode provides the voltage drop to get the motor voltage down to around 4 volts. I also removed the capacitor, battery, and battery heat sensor (see photos later).
Time Required Min
1時間
Time Required Max
2時間
Imageid
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後
Difficulty
Difficult
Conclusion
To reassemble your device, follow these prerequisite instructions in reverse. It’s a fussy process, but not as hard as taking it apart.
Author
Make A. Mend
Public
いいえ

ガイドの前提条件

ツール

  • Soldering Iron x1 added.

パーツ

  • USB Power Adapter for iPhone and iPod x1 added.
  • USB-A to mini USB-B cable Any USB-A cable will work if it matches the power adapter. x1 The non-USB-A end will be cut off. added.

フラグ

  • In Progress added.
  • Community-Contributed Guide added.

手順

ステップ 1
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stepid 275641 stepid 275641