Schumacher Electric SJ1 User Manual (English)

Questions and Answers:

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Jason JonesAug 7, 2025
What to do if my Schumacher Electric Power Supply won't jump start my car?
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  ricky49Aug 7, 2025
  If your Schumacher Electric Power Supply won’t jump start your car, several factors could be at play. First, ensure the clamps have a solid connection to both the battery and the frame, and that these connection points are clean. If the connections are reversed, disconnect and reverse the clamps. Check the battery status by pressing the Battery Status button on the unit's front to ensure it's adequately charged. Also, verify that the portable power is turned on by setting the ON/OFF switch to the ON position. If these steps don't resolve the issue, the vehicle's battery might be defective and should be checked.
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Joseph ZimmermanAug 11, 2025
Why is the alarm on my Schumacher Electric Power Supply on?
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  Erin ClayAug 11, 2025
  If the alarm on your Schumacher Electric Power Supply is activated, it likely indicates reversed connections. To resolve this, disconnect the jump starter and reverse the clamps.
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Edward KimAug 16, 2025
What to do if my Schumacher Electric Power Supply won’t power my 12V device?
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  thomasmichaelAug 16, 2025
  If your Schumacher Electric Power Supply won't power your 12V device, start by ensuring the 12V device is switched on. Next, check the portable power's battery charge by pressing the Battery Status button. If the device still won't power on, it's possible the 12V device draws more than 15A or has a short circuit. In this case, a qualified service technician should replace the fuse.
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Christopher AllenAug 21, 2025
Why does the display of my Schumacher Electric Power Supply show 'err'?
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  Joshua SullivanAug 21, 2025
  If the converter is on but the display of your Schumacher Electric Power Supply only shows 'err', it could be due to two reasons. Either the jump starter battery isn't fully charged (recharge the unit), or the device you're using is drawing too much power (more than 200W) or has a short circuit. Ensure you're only using devices that draw less than 1.7 amps of AC current.
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angelica09Aug 27, 2025
Why won’t the battery in my Schumacher Electric Power Supply hold a charge?
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  waynepaulAug 27, 2025
  If the battery in your Schumacher Electric Power Supply won’t hold a charge, it's likely that the battery is faulty and cannot accept a charge. It is recommended to have the battery checked.
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james41Aug 31, 2025
What to do if the compressor on my Schumacher Electric Power Supply shuts off?
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  Ashley AcostaAug 31, 2025
  If the compressor on your Schumacher Electric Power Supply shuts off, it's likely overheated. Allow it to cool down for a few minutes before trying again.

Schumacher Electric SJ1 Specifications

General

Model	SJ1
Type	Battery Charger
Input Voltage	120V AC
Output Voltage	12V DC
Amperage	1.5A
Charger Type	Automatic
Battery Compatibility	12V Lead-Acid Batteries
Safety Features	Short circuit protection, reverse polarity protection