From beckwith at snf.stanford.edu Mon Nov 6 19:47:56 2000 From: beckwith at snf.stanford.edu (Sharleen Beckwith) Date: Mon, 6 Nov 2000 19:47:56 -0800 Subject: hot pot problems Message-ID: Folks: Over the weekend the quartz thermocouple sheath in the sulfuric hot pot broke. When Ray looked at it, the thermocouple appeared to be corroded. In an effort to keep the diff bench up and running, it was decided that the thermocouple and quartz sheath from one of the wbnonmetal hot pots could be put in the wbdiff sulfuric hot pot until the new parts arrive. Unfortunately, the second thermocouple broke during the switch. Ray said he will make every effort, first thing in the morning, to replace the thermocouple in wbdiff. It will take longer to get the quartz sheaths, so the sulfuric hot pot in wbnonmetal may be down for a few days. Sharleen From amol at stanford.edu Fri Nov 10 09:41:22 2000 From: amol at stanford.edu (Amol Ramesh Joshi) Date: Fri, 10 Nov 2000 09:41:22 -0800 (PST) Subject: Possible contamination of wbdiff and wbnonmetal Message-ID: Hi, Today I found a user doing nonstandard 'cleaning' on wbdiff and wbnonmtal. He was etching oxide in 20:1 BOE and 6:1 BOE on wbnonmetal and H2SO4 dip and HCl dip on wbdiff. He was holding just one wafer with teflon tipped METAL tweezers, no cassette! As most users know, teflon on green tipped tweezers tends to wear out after some use. So there is a very high chance that metal may have entered the pots I mentioned above. I do not need to mention safety issue, no matter how careful one is. I have shutdown wbdiff and wbnonmetal. - Amol From jgarate at snf.stanford.edu Fri Nov 10 11:23:04 2000 From: jgarate at snf.stanford.edu (Jaime Garate) Date: Fri, 10 Nov 2000 11:23:04 -0800 Subject: Possible contamination of wbdiff and wbnonmetal References: Message-ID: <3A0C4B18.57E014B6@snf.stanford.edu> Hi, I have talked to the user responsible for this. Not only for the safety issue, but for the cross- contamination issue. He is involve on the clean up. The WBNONMETAL- has been decontaminate and it is okay to use. The WBDIFF- still down under decontamination. (1) You are not allow to dip your metal tweezers at these wet benches at all!!! (2) You are not allow to go from 20:1 or 6:1 on wbnonmetal to a H2S04 dip and HCL dip on wbdiff at all!!! (3) We are all members so please follow the procedures and work safely. Thanks, Jaime Garate Amol Ramesh Joshi wrote: > > Hi, > > Today I found a user doing nonstandard 'cleaning' on wbdiff and > wbnonmtal. He was etching oxide in 20:1 BOE and 6:1 BOE on wbnonmetal and > H2SO4 dip and HCl dip on wbdiff. He was holding just one wafer with teflon > tipped METAL tweezers, no cassette! As most users know, teflon on green > tipped tweezers tends to wear out after some use. So there is a very high > chance that metal may have entered the pots I mentioned above. I do not > need to mention safety issue, no matter how careful one is. I have > shutdown wbdiff and wbnonmetal. > > - Amol From beckwith at snf.stanford.edu Tue Nov 14 15:38:56 2000 From: beckwith at snf.stanford.edu (Sharleen Beckwith) Date: Tue, 14 Nov 2000 15:38:56 -0800 (PST) Subject: no spray in the left dump rinser Message-ID: this means your cassette handles are not being rinsed properly. I suggest you use the right dump rinser, or take the handle off your cassette and throw it in the bottom of the dump rinser so it gets rinsed during the 6 cycles, then put it back on again. Sharleen From hopcroft at snf.stanford.edu Wed Nov 29 17:05:12 2000 From: hopcroft at snf.stanford.edu (Matt Hopcroft) Date: Wed, 29 Nov 2000 17:05:12 -0800 (PST) Subject: Left Piranha-Broken Wafer Message-ID: TO: SNF Member who left their broken wafer in the Left Sulfuric Bath FROM: Matt Hopcroft RE: Thanks for nothin' I took your broken wafer out of the sulfuric bath this afternoon. It did take some time, but it wasn't difficult- in fact, I bet you could have done it yourself! From gsarmien at snf.stanford.edu Thu Nov 30 09:34:59 2000 From: gsarmien at snf.stanford.edu (gsarmien at snf.stanford.edu) Date: 30 Nov 2000 17:34:59 -0000 Subject: HF bath Message-ID: <20001130173459.25479.qmail@snf.stanford.edu> Whoever was using the 6:1HF yesterday, last night or early this morning left a mess on the wetbench. There were a lot of white crystals all around the bath and the dump rinser. I rinsed it off for you, I bet you can do this yourself too. Gladys