|AC Adapter as replacement of NiCd Batteries|
Message #8 Posted by Andrés C. Rodríguez (Argentina) on 30 Sept 2000, 4:21 p.m.,
in response to message #7 by Joe
In any case you use an AC power supply to replace NiCd batteries, please be sure that such power supply is REGULATED. That means it has an electronic circuit that will deliver always the same voltage, regardless of actual load. Simple AC adapters (transformer+diodes+capacitor) are not regulated and may damage your printer.
I don't know how to tell you how could you verify this, at least ask at the shop where you are buying the AC adapter, and be sure about:
- DC output (not AC, rather obvious but ...)
- Output voltage (Should match the battery pack you are replacing, each series-connected NiCd battery adds 1.25 V to the pack. For instance, 4 batteries = 4 x 1.25 V = 5 Volt)
- Regulator circuit (Has or has not? MUST have!)
- Polarity (Identify the positive and negative leads)
- Maximum output current (Must be enough for the load)
Other convenient features include:
- Short circuit protection
- Thermal protection (For overload conditions)
I hope this list may help you, at least to ask the right questions to the salesperson!