sci.electronics.repair@googlegroups.com

Google Groups

"Gareth Magennis" <soundserviceleeds@outlook.com>: Apr 19 08:33PM +0100 "N_Cook" wrote in message news:nf5atq$2p0$1@dont-email.me...   Owner acquired knowingly non-working off a friend of a friend, so no point in asking him/them what is normal operation. Nothing about the following test routine? in the user manual Reported as ok for practise use but will not switch into high-power gig mode. I've not got inside yet to monitor power rails/ try use dummy loads etc. Low level test signal in, the output jumps to a high level soon after switch on, plus bargraph surge, for half a second and then drops back to low level. Is this normal, just checking-out +/-40V to +/-90V switching of rails is ok? If so why the bargraph jump?             Rant:   There was a time when Peavey had a large facility in Corby, UK. If you wanted spares, you could phone them and anything you wanted would be there in a couple of days. It was an excellent service, one of the best.   Now the Corby Facility is closed. You have to go through a 3rd party, Barnes & Mullins.   Ask for a pot for a particular amplifier, and you have no chance. They have to contact Peavey USA, get a part number, then try and get it across the pond.   Tried that, just doesn't work. Peavey spares are now largely unobtanim, the brand is dead in the UK.       Gareth.

Arfa Daily <arfa.daily@itsalljustbollocks.com>: Apr 20 01:21AM "Gareth Magennis" <soundserviceleeds@outlook.com> wrote in   > Gareth.   However, Peavey service in the U.S. are very helpful with requests for service manuals, and help and advice with obscure problems.   Arfa

N_Cook <diverse@tcp.co.uk>: Apr 20 08:14AM +0100 On 19/04/2016 20:33, Gareth Magennis wrote:   > Tried that, just doesn't work. > Peavey spares are now largely unobtanim, the brand is dead in the UK.   > Gareth.   Just as well I never use main agents. Got the sections out of the box to work on. Class G PAs with only ch1 &2,signal-in from Prea according to the schema , so whatever is causing the leap and drop back at switch on is in the Prea. A surge to exercise the on-demand fan at switch on would make sense , but not via increasing signal as seemingly thermal monitoring. Will check the minor rails first and then see if the high-power sections of the G PAs function, but at the moment I see no common section in the PA , between ch1 and ch2 other than power rails, that could cause that, later in actual use. Very unlikely matching components would both fail in ch1 and ch2 PA at the same time

"Gareth Magennis" <soundserviceleeds@outlook.com>: Apr 20 08:46AM +0100 "Arfa Daily" wrote in message news:XnsA5F0180D29E49arfadailyitsalljustb@81.171.92.236...   "Gareth Magennis" <soundserviceleeds@outlook.com> wrote in   > Gareth.   However, Peavey service in the U.S. are very helpful with requests for service manuals, and help and advice with obscure problems.   Arfa               To be fair, that is my experience too so far.   One thing they were unable to help with though: I had 2 Peavey Pro 15 cabinets with blown HF diaphragms from different customers. (one just brought the driver/horn)   Now Peavey no longer supply replacement diaphragms for this driver, but now use a different driver and diaphragm altogether. (Mark 2 cab presumably) I bought 2 of these from Barnes and Mullins UK, after being told by Peavey this is the replacement, to find they were much bigger and heavier than the original, and do not fit in the cabinets.   I checked again with Peavey in case I had been supplied the wrong part, but in fact this is the part they think is a replacement.     Gareth.

N_Cook <diverse@tcp.co.uk>: Apr 20 11:26AM +0100 On 20/04/2016 08:46, Gareth Magennis wrote:   > Gareth.   Somewhere along the way this amp has acquired 2 printed pages of the G class PA, presumably someone accessed from Peavey as I cannot find it out in wwwland for a clearer image, useable images but should have been printed out as 4x A4 as some fine details is lost . pages titled Mixer amp 600 watts A, and internal doc number 99099390

N_Cook <diverse@tcp.co.uk>: Apr 20 02:14PM +0100 Via chinese whispers I had got the diagnosis of a problem with the "forward processor" whatever that meant. Going by the ribbon damage to the digital board, perhaps it means problem with the Feedback Ferret (TM) falsely detecting feedback and inserting attenuation. I wonder if its possible to bypass/defeat that, if proves to be the problem

jurb6006@gmail.com: Apr 19 04:44PM -0700 Got in a pack of new clip leads. I can do alot of things with clip leads. They are a bench staple like the ends off of components, paper clips, various glues and potions.   OK, fairly nice set of leads.   THEY CAME IN AN ANTI STATIC BAG !   I want to call that company and ask if they have any DVD rewinders in stock.

etpm@whidbey.com: Apr 19 05:20PM -0700 >OK, fairly nice set of leads.   >THEY CAME IN AN ANTI STATIC BAG !   >I want to call that company and ask if they have any DVD rewinders in stock. DVD rewinders are rare. Write only memory is rare too, but not rare enough. I have come across write only memory DVDs and that's what I use my DVD rewinder for. Eric

ohger1s@gmail.com: Apr 19 05:30PM -0700 > OK, fairly nice set of leads.   > THEY CAME IN AN ANTI STATIC BAG !   > I want to call that company and ask if they have any DVD rewinders in stock.       I'm forever stepping on the ones that fall off the bench unnoticed, and they flatten almost completely (and I'm not overweight). Years ago, clip leads were heavy stamped steel or copper and much more durable. If you ever run across a source for these let me know.   How fast is the DVD rewinder?

John Robertson <spam@flippers.com>: Apr 19 08:35PM -0700 > enough. I have come across write only memory DVDs and that's what I > use my DVD rewinder for. > Eric   WOM is not that rare - the 25120 was designed by Signetics engineer John G 'Jack' Curtis back in the early 70s and included in their catalog:   http://www.repeater-builder.com/molotora/gontor/25120-bw.pdf   John ;-#)#   -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out."

Heisenberg <Barry@saymyname.com>: Apr 20 01:54PM +1000 >Got in a pack of new clip leads. I can do alot of things with clip leads.   By alot do you mean not a lot the way atheist means not a theist?   >various glues and potions.   >OK, fairly nice set of leads.   >THEY CAME IN AN ANTI STATIC BAG ! The bag worked didn't it?   =-=- "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (*Diagnostic and Statistical Manual of Mental Disorders)

John Robertson <spam@flippers.com>: Apr 19 08:54PM -0700 On 04/19/2016 8:35 PM, John Robertson wrote: > G 'Jack' Curtis back in the early 70s and included in their catalog:   > http://www.repeater-builder.com/molotora/gontor/25120-bw.pdf   > John ;-#)#   Ah, the background story to the WOM is here:   http://www.sigwom.com/   Fun read!   Yay Jeff Leiberman!   John :-#)#   -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out."

Heisenberg <Barry@saymyname.com>: Apr 20 01:55PM +1000 >enough. I have come across write only memory DVDs and that's what I >use my DVD rewinder for. >Eric   I have a camcorder that uses standard beta cassetes.   =-=- "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (*Diagnostic and Statistical Manual of Mental Disorders)

Jeff Liebermann <jeffl@cruzio.com>: Apr 19 09:13PM -0700 On Tue, 19 Apr 2016 20:35:56 -0700, John Robertson <spam@flippers.com> wrote: >G 'Jack' Curtis back in the early 70s and included in their catalog: >http://www.repeater-builder.com/molotora/gontor/25120-bw.pdf >John ;-#)#   I was one of the winners in the applications contest. I later tried to specify a WOM in a design: <http://www.sigwom.com/?page_id=57> <http://ba.internet.narkive.com/Y3r0WXMC/ot-signetics-wom-hey-jeff-liebermann>   -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann <jeffl@cruzio.com>: Apr 19 09:45PM -0700 >THEY CAME IN AN ANTI STATIC BAG !   Anti-static bags don't work. I put one of my radio designs inside such a bag and all I heard out of the speaker was the same old static.   I like the DVD rewinder, but can't you just insert the CD upside-down and play it again to rewind it?   You really need anti-static bags for protecting clip leads. Atmospheric electricity increases at the rate of about 30 volts/ft[1]. If you're 6ft tall, there should be 180 volts between your head and your toes. If you bridge this voltage with one of your new clip leads, it will surely create a spark. With the typical low quality of Chinese clip leads, that would probably blow the wire as if it were a fuse.     [1] <https://en.wikipedia.org/wiki/Atmospheric_electricity> "...the potential, aka 'voltage', increases with altitude at about 30 volts per foot (100 V/m)..."   -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558

jurb6006@gmail.com: Apr 20 02:38AM -0700 >"I like the DVD rewinder, but can't you just insert the CD >upside->down >and play it again to rewind it?"   I think that voids the warranty on Sonys and a couple of other brands.

Heisenberg <Barry@saymyname.com>: Apr 20 08:46PM +1000 >>"I like the DVD rewinder, but can't you just insert the CD >upside->down >>and play it again to rewind it?"   >I think that voids the warranty on Sonys and a couple of other brands.   I can insert a DVD upside down in my laptop to write the label.   =-=- "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (*Diagnostic and Statistical Manual of Mental Disorders)

thekmanrocks@gmail.com: Apr 20 03:56AM -0700 Heisenberg wrote: "- show quoted text - I can insert a DVD upside down in my laptop to write the label. - show quoted text -"   You actually got that "Lightscribe" thing to work?? Stuck a disk in my tower, configured the label the way I wanted it, hit "OK", waited a half a friggin HOUR, no status on the screen, no sounds from the CD/DVD disc DRIVE, eject - blank label. Never bothered with it again.

"Ian Field" <gangprobing.alien@ntlworld.com>: Apr 19 07:22PM +0100 Recently, my Logitech mouse went tits-up and took the entire motherboard USB subsystem with it!   The MOBO is still useable, but sometimes there's weird "artifacts" on the video. A USB expansion card has solved the interface deficiency.   My question is; are Logitech mouse notorious for this failure mode?   I went through a lot of USB optical wheel mouse that I didn't like, then I got the Logitech which was OK - till this happened.   Thanks for any help.

Mike Paff <MCP@mindless.com>: Apr 19 01:22PM -0700 On Tue, 19 Apr 2016 19:22:43 +0100, "Ian Field"   >I went through a lot of USB optical wheel mouse that I didn't like, then I >got the Logitech which was OK - till this happened.   >Thanks for any help.   Maybe a short developed in the mouse cable. If the motherboard doesn't have a polyfuse on the USB +5V line (many cheap ones don't), a short could burn out the trace and take out the USB subsystem.   Did you have the mouse cable routed in a way that could lead to it getting abraded, pinched, or repeatedly bent sharply?

"Ian Field" <gangprobing.alien@ntlworld.com>: Apr 19 09:45PM +0100 "Mike Paff" <MCP@mindless.com> wrote in message news:6l4dhbld090674571c9eg4nr5mg1jbv7c7@4ax.com... > a short could burn out the trace and take out the USB subsystem.   > Did you have the mouse cable routed in a way that could lead to > it getting abraded, pinched, or repeatedly bent sharply?   Inspection shows the cable in good condition, but I've been too busy to remove it and test it electrically.   The board is an MSI with an Intel 945 of some description (there seems to be endless variants).   Somewhere I have an MSI; MS7204 (AKA 945P). But it has a huge CPU cooler that overhangs the edge of the board and won't fit a case with any drive bays.   The 945 (something or other) has a regular cooler - the one on the 945P has lots of fins with copper pipes running through them. No idea whether they're interchangable, but I'm not optimistic.

Jeff Liebermann <jeffl@cruzio.com>: Apr 19 03:44PM -0700 On Tue, 19 Apr 2016 19:22:43 +0100, "Ian Field"   >Recently, my Logitech mouse went tits-up and took the entire motherboard USB >subsystem with it!   Any particular Logitech model number mouse?     >My question is; are Logitech mouse notorious for this failure mode?   >I went through a lot of USB optical wheel mouse that I didn't like, then I >got the Logitech which was OK - till this happened.   No. Between me and my customers, I deal with hundreds of mice. The overwhelming majority of which are Logitech. Among the USB flavor, I've never blown a USB port with a mouse. In order to do that, one needs to apply external power to the port, and shove it down the +5v line. There's no way to do that by shorting any of the 4 wires in the USB plug and all the Logitech mice with internal battery power are wireless.   My guess(tm) is that you might be using a defective USB hub. Something like this abomination, that connects the external power supply to the +5v line. <https://www.youtube.com/watch?v=Uh6iKilgtG0>   When I get back to work next week, I'm going to build a simple LED tester for this problem, and test my rather large junk pile of USB hubs for this problem.       -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann <jeffl@cruzio.com>: Apr 19 03:55PM -0700 On Tue, 19 Apr 2016 15:44:27 -0700, Jeff Liebermann <jeffl@cruzio.com> wrote:     >>Recently, my Logitech mouse went tits-up and took the entire motherboard USB >>subsystem with it!   >Any particular Logitech model number mouse?   Oops. I didn't see the model number in the Subject line. Sorry(tm):   <http://www.ebay.com/itm/161911359106> I have seen hundreds of those over the years. They may have mechanical switch failures, deteriorating rubber on the mouse wheel, having the too small sticky dots (feet) fall off, or in extreme cases, having the plastic ring around the dots wear off. No electronic failures that I can recall, and certainly no dead USB ports on an associated computahs. As I previously mumbled, look for a USB hub problem or a problem with something plugged into the USB port that has an external power supply.         -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558

avagadro7@gmail.com: Apr 19 06:47PM -0700 On Tuesday, April 19, 2016 at 2:22:19 PM UTC-4, Ian Field wrote:   > I went through a lot of USB optical wheel mouse that I didn't like, then I > got the Logitech which was OK - till this happened.   > Thanks for any help.   push hole in bottom rear mouse restores to pre-Logictech

thekmanrocks@gmail.com: Apr 19 10:14AM -0700 Chuck:   Thanks for sharing! It's even got a turntable.

You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com.