Panasonic KX-P7510 Operating Guide

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Appendix
 For best printing results
Avoid printing in high humidity i.e., above 70% RH.
High humidity may cause the envelope to curl and pick up excess toner.
High humidity may also cause the envelope to seal.
Avoid printing below 10°C (50°F) with less than 30% RH. Low temperature with low humidity may 
cause light printing.
Envelope storage is very important. Store them away from moisture and humid air, where they can 
lay flat and their edges won’t be bent or damaged. The humidity should not exceed 70% RH.
Cable
Parallel
IEEE 1284
Serial
RS-232C
LocalTalk (RS-422)
IrDA
RS-232C
IrDA