sichermn@beach.csulb.edu (Jeff Sicherman) (05/15/91)
What are the (monthly) duty cycles of the various Laserjet II and III models? Also, what is the real significance of these figures in actual use. How closely should they be followed in operation ? Are they true monthly (or even daily) based or monthly averages based upon some expected MTBF (or mean copies between failures) ? What are the risks of exceeding them ?
charlies@hpnmdla.sr.hp.com (Charlie Sallberg) (05/16/91)
Here's what it says for usage on the new LJIIIP data sheet I just got: LaserJet IIP, up to 6,000 pages per month. IIIP, up to 8,000 III, up to 16,000 IIID, up to 20,000 IIISi, up to 50,000 I don't work at the division which makes LaserJets, so that's all I know. Charlie
charlies@hpnmdla.sr.hp.com (Charlie Sallberg) (05/17/91)
As I stated in my previous note, I don't have any further information to answer the original questions, but there are some LaserJet experts on the comp.laser-printers notes group that might be able to. (Jeff, got your e-mail message, but my reply back was bounced) Charlie
kevinh@hp-vcd.HP.COM (Kevin Hudson) (05/17/91)
/ hp-vcd:comp.periphs.printers / sichermn@beach.csulb.edu (Jeff Sicherman) / 8:12 am May 15, 1991 / >> Also, what is the real significance of these figures in actual use. How >>closely should they be followed in operation ? Are they true monthly (or >>even daily) based or monthly averages based upon some expected MTBF (or >>mean copies between failures) ? What are the risks of exceeding them ? ---------- I'm simplifying things a bit, but the pages per month (PPM) numbers are basically derived by taking the expected lifetime of the mechanism (in pages) and dividing by the number of months someone might be expected to own and use the machine. For instance, if the machine is determined to have a lifetime of 1,000,000 pages, and the expected "time-to-obsolescence" is 5 years, you get about 17,000 PPM. If you exceed this, the "risk" you take is that your mechanism has a chance of not making it to the ripe old age of 5. Kevin Hudson *-------------------------------------------------------------------------* The above is not HP-stated policy or procedure, but my own opinion or explanation. *-------------------------------------------------------------------------*