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Troubleshooting
If TekCharge MP1550 does not power your portable device or charge the device battery, take these steps:
1. Check the battery status to ensure that the AA batteries are good, or that the rechargeable batteries
are charged.
2. Check that the input/output cord is connected to both TekCharge and the portable device, and that the
adapter plug fits snugly into the power jack on your portable device. If not, try another adapter.
3. If connecting TekCharge to a device with a DC jack, verify that the polarity of the device power jack is
center positive. If the polarity is center negative, do not power the device with TekCharge as it does
not support center negative.
4. Verify that a battery is installed in the portable device as some devices will not function without a
battery installed.
5. Verify if your device is designed with charging circuitry that limits the input voltage. If so, TekCharge
MP1550 may not be able to power or charge the device. (For example, if a device is designed to
accept only a 4.2V input, then TekCharge MP1550 may not be able to power or charge the device.)
Center Negative
Center Positive
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