daafies Posted March 23, 2013 Share Posted March 23, 2013 (edited) Hi All, i have a problem with one of my 1050s in that it wont boot. here is a scenario: 1) turn on 1050. light turns on, head goes back and forth with activity led on. then activity led goes off (head stops at the sensor. does not hit the mechanical stop) 2) insert bootable disk (boots fine on other 1050) close latch. now head does not move, but disk spins and activity led goes on for 4-5 seconds. 3) turn on 800xl. now the 1050 does nothing. no light, no movement no sound from 1050. screen says "READY" and power LED on 1050 is ON i've tried different cables. changing the 1050 with my spare, using same cables and power supply it all works. those 3 big caps do not get hot, but the heat shield does get warm. i've tried pushing down the ICs in the metal shielded area. reseated connects. tried different "drive select" addresses. also tried both IO connectors. given all that, what would be most likely to be the problem? thank you! david Edited March 23, 2013 by daafies Quote Link to comment Share on other sites More sharing options...
Rybags Posted March 24, 2013 Share Posted March 24, 2013 Sounds like all normal behaviour except the not booting part. When first powered on the head will return to home so inserting a disk shouldn't seek first up. Drive ID switch is the most likely thing needing a look at. The settings should be printed on the label on the back of the drive. If that doesn't help and you have a way of otherwise booting a Dos, you could boot up a Dos disk and attach the drive and just do directory on each possible drive number to see if the drive is visible. I've not heard of drive ID switches going bad but it's always a possibility. Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted March 24, 2013 Share Posted March 24, 2013 Sounds like the SIO is not working. I have seen a few LM3086s cause this. It is U1... Bob Quote Link to comment Share on other sites More sharing options...
daafies Posted March 24, 2013 Author Share Posted March 24, 2013 Hi thanks for the reply. I sprayed some contact cleaner in the selector switch. Booted up in dos with the good drive. Changed to the bad drive, tried indexing d1, d2, d3 and d4. All give error 138 . Quote Link to comment Share on other sites More sharing options...
daafies Posted March 24, 2013 Author Share Posted March 24, 2013 LM3086. I can try that. Thanks! Quote Link to comment Share on other sites More sharing options...
daafies Posted March 24, 2013 Author Share Posted March 24, 2013 actually. where do i buy this one? mouser and digikey dont have it in stock. ebay? LM3086. I can try that. Thanks! Quote Link to comment Share on other sites More sharing options...
daafies Posted March 24, 2013 Author Share Posted March 24, 2013 http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574883395&toolid=10001&campid=5336500554&customid=&mpre=http%3A%2F%2Fcompare.ebay.com%2Flike%2F270904987635%3Fvar%3Dlv%26ltyp%3DAllFixedPriceItemTypes%26var%3Dsbar ?? Quote Link to comment Share on other sites More sharing options...
daafies Posted March 24, 2013 Author Share Posted March 24, 2013 http://www.mouser.com/ProductDetail/Intersil/CA3086/?qs=%2fha2pyFadug6enCsAAavkwxnsb7Fo9zwoirtY329gG4%3d ? Quote Link to comment Share on other sites More sharing options...
1050 Posted March 24, 2013 Share Posted March 24, 2013 http://rover.ebay.co...mTypes&var=sbar ?? Be sure you get only the 3086 or it's EXACT equivalent the NTE 912 which is sold by the Radio Shack shop on eBay. Any other claims of equality are not to be trusted as accurate. Mouser doesn't have any 3086 but may have NTE912 at ten a pop. Chinese on eBay have plenty of 3086 if you can wait a month for them. Oops.... http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574883395&toolid=10001&campid=5336500554&customid=&mpre=http%3A%2F%2Fwww.ebay.com%2Fitm%2FNTE912-Integrated-Circuit-General-Purpose-Transistor-Array-NTE912-%2F160984350462 Quote Link to comment Share on other sites More sharing options...
daafies Posted March 24, 2013 Author Share Posted March 24, 2013 Thank you! I'll keep y'all posted Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted March 24, 2013 Share Posted March 24, 2013 Jameco has CA3086 for $2. That's what I use... Bob Quote Link to comment Share on other sites More sharing options...
daafies Posted March 25, 2013 Author Share Posted March 25, 2013 thanks Bob, i was looking at that one as well. Quote Link to comment Share on other sites More sharing options...
daafies Posted March 25, 2013 Author Share Posted March 25, 2013 found the nte912 at fry's for 6.99. Quote Link to comment Share on other sites More sharing options...
daafies Posted March 26, 2013 Author Share Posted March 26, 2013 that didn't fix the issue. it was a pain to get the old one out! Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted March 26, 2013 Share Posted March 26, 2013 The 3086 feeds U7, the 6532. Cut the leads off at the body of the IC and pull them out one at a time. Clear the holes with solder braid or a solder-sucker. Did the board get damaged? Bob Quote Link to comment Share on other sites More sharing options...
daafies Posted March 28, 2013 Author Share Posted March 28, 2013 yea i ended up cutting the leads. i dont think i damaged it. i tried to be careful. i'll look into the 6532 Quote Link to comment Share on other sites More sharing options...
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