bert@athens.iex.com (Bert Campbell) (03/11/89)
There were some postings a few months back about premature failures
with Wyse 60 terminals. Most of the 15-20 of them that we bought
have died now. I've found that many of them have bad flybacks, and
have fixed a couple by replacing them. The remaining ones have
a mysterious power-supply suicide mode, in which Q-102 shorts itself
out. Replacing Q-102 is no help, it just shorts again.
Did anyone ever find out what the real problem with the boards are?
Replacing the entire board seems extreme. Just trying to get
a service manual from Wyse is like passing through 7 levels of hell.
Bert Campbell {convex,uunet}iex!bert 214-612 2600 x309kb@hpfcdc.HP.COM (Ken Burgess) (03/16/89)
I receintly fixed a Wyse 60 I bought at auction. The problem was a shorted diode in the grid supply for the CRT. The shorted diode caused excessive current in the flyback transformer and power transistor. These componants might have failed if the unit were left on long enough to cause thermal problems. Fortunatly in my unit they were still OK. Do you suppose these terminals have multiple common failure modes? Ken (No I don't have a schematic either) Burgess
nvk@ddsw1.MCS.COM (Norman Kohn) (03/19/89)
In article <5960005@hpfcdc.HP.COM> kb@hpfcdc.HP.COM (Ken Burgess) writes: >I recently fixed a Wyse 60 I bought at auction. The problem was a shorted >diode in the grid supply for the CRT... > >Do you suppose these terminals have multiple common failure modes? I've had two wyse-60's that began to make a high-pitched whine, which can be stopped by fiddling with the modem connector on the back. When wyse-50's started to make a similar sound, they died soon after. I long ago stopped ever turning them off: failure, when it occurred, almost always came at power-on. -- Norman Kohn | ...ddsw1!nvk!norman Chicago, Il. | days/ans svc: (312) 650-6840 | eves: (312) 373-0564
pag@tcsc3b2.UUCP (Philip A. Gross) (03/22/89)
In article <3141@ddsw1.MCS.COM>, nvk@ddsw1.MCS.COM (Norman Kohn) writes: > In article <5960005@hpfcdc.HP.COM> kb@hpfcdc.HP.COM (Ken Burgess) writes: > >I recently fixed a Wyse 60 I bought at auction. The problem was a shorted > >diode in the grid supply for the CRT... > > > >Do you suppose these terminals have multiple common failure modes? > > I've had two wyse-60's that began to make a high-pitched whine, > which can be stopped by fiddling with the modem connector on the back. > When wyse-50's started to make a similar sound, they died soon after. > I long ago stopped ever turning them off: failure, when it occurred, > almost always came at power-on. > All of the terminals that we have, except for the system consoles are Wyse 60s. We have had several fail, and if they are not in warranty, then it can cost a whopping $128.00 to get it fixed. We finally talked to a service manager at Wyse Tech. and we were informed that a part (I believe the flyback transformer) has a rated life of approx. 14000 hours. Thus after a little more than a year of continuous operation, one could expect the terminal to stop working. He suggested that when possible, the users should turn their terminal off at the end of a day. This would effectively extend the life of the terminal to over two years. =============================================================================== Philip A. Gross The Computer Solution Co., Inc. Voice: 804-794-3491 ------------------------------------------------------------------------------- INTERNET: pag@tcsc3b2.tcsc.com USENET: ...!tcsc3b2!pag UUCP: tcsc3b2!pag (804)794-1514 ATTMAIL: attmail!tcsc3b2!pag ------------------------------------------------------------------------------- The opinions expressed here are strictly mine and nobody elses. << I haven't heard what I have to say about that yet. >> :-)
axp@mace.cc.purdue.edu (Brian Moore) (03/25/89)
In article <665@tcsc3b2.UUCP> pag@tcsc3b2.UUCP (Philip A. Gross) writes: [stuff deleted] >..talked to a service manager at Wyse Tech. and we were informed that a >part (I believe the flyback transformer) has a rated life of approx. >14000 hours. Thus after a little more than a year of continuous >operation, one could expect the terminal to stop working. He suggested >that when possible, the users should turn their terminal off at the end >of a day. This would effectively extend the life of the terminal to over >two years. Is this the old model Wyse-60s or the new ones? From what I understand, Wyse Tech. redesigned this terminal in mid-1987, correct me if I am wrong. How easy is this part to replace for someone with few technical skills? Or, is there some way to prevent this from happening? Certainly, a terminal should last more than one or two years. Thanks, Brian Moore -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Brian Moore -- axp@{boiler,h,i,j,k,mace,mentor,s,staff}.purdue.edu Purdue University, West Lafayette, IN 47906
nvk@ddsw1.MCS.COM (Norman Kohn) (03/26/89)
In article <665@tcsc3b2.UUCP> pag@tcsc3b2.UUCP (Philip A. Gross) writes: >... We finally talked to a service manager at Wyse Tech. and we were >informed that a part (I believe the flyback transformer) has a rated >life of approx. >14000 hours. Thus after a little more than a year of continuous >operation, one could expect the terminal to stop working. He suggested >that when possible, the users should turn their terminal off at the end >of a day. This would effectively extend the life of the terminal to over >two years. Sounds like the fancy new electronic typewriter that I just threw away when it went dead... cost to fix is similar (hard to spend less these days to get a piece of equipment onto someone's bench) but the replacement costs little more. I find that the whine on the wy-60 comes and goes if you push/pull on the serial connector on the back. -- Norman Kohn | ...ddsw1!nvk!norman Chicago, Il. | days/ans svc: (312) 650-6840 | eves: (312) 373-0564