Printer Problems

In debugging Asa H 2.0 I frequently print out a hard copy of code to proof read, trace, and file.  I have 4 or 5 printers that I use but the one on my desk at ESU is an old Epson Stylus color 600.  I find that I have bugs in my code listings that are caused by hardware (printer) failure.  An equal sign in the code, = , gets printed as a minus sign, - , in the printed listing.  The first time I came across this in proof reading I thought I had caught a coding error.  More recently I have had cases where this happened 3 or more times in just a few hundred lines of code.  I may either retire the printer (if our administrators will buy me a new one) or restrict its use to word processing and the like.