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From: campbell%maynard.UUCP@HARVARD.ARPA
Newsgroups: net.micro
Subject: Re:  Need help with Rainbow printer(LA50)
Message-ID: <2217@brl-tgr.ARPA>
Date: Thu, 17-Oct-85 11:34:11 EDT
Article-I.D.: brl-tgr.2217
Posted: Thu Oct 17 11:34:11 1985
Date-Received: Sat, 19-Oct-85 04:07:45 EDT
Sender: news@brl-tgr.ARPA
Lines: 20

The Rainbow and the LA50 both, by default, use XON/XOF synchronization.
There's a switch on the LA50 (switch SW1, position 6) that controls whether
XON/XOF or Ready/Busy is used;  XON/XOF is selected by having the switch
in the open position (towards the front of the printer).

Something else to be aware of is that a very common failure mode of the
LA50 PCB is that it loses XON/XOF synchronization (I suspect the buffer
full check fails).  I've seen this happen on at least two different
printers.  You should try borrowing someone else's LA50 and see if the
problem goes away.  Unfortunately, DEC doesn't repair LA50's...  they
throw them away and sell you a new one, for just a bit less than list
price.
--
Larry Campbell                     decvax!genrad
The Boston Software Works, Inc.                 \
120 Fulton St.                 seismo!harvard!wjh12!maynard!campbell
Boston MA 02109                         /       /
                                   ihnp4  cbosgd

ARPA: campbell%maynard.uucp@harvard.arpa