RL02 Spinup fails

Van: Aaron Jackson via cctalk<mailto:cctalk at classiccmp.org> Verzonden: maandag 6 november 2017 19:15 Aan: cctech at classiccmp.org<mailto:cctech at classiccmp.org> Onderwerp: RL02 Spinup fails Hi everyone, I have managed to hook up an RL02 drive to my PDP-11 (thanks to Dave Wade for the drives) . This took me longer than I thought it would - I tried with a flat ribbon cable with a DIY terminator going straight into board , but couldn't get it to work. Removed the terminator, and the fault light turned off. So that's positive. I tried to load a cartridge, which I had cleaned, inspected and generally appears to be in good condition. It started to spin up and I could hear it getting faster, but after 30-40 seconds the fault light returns. I made a short video demonstrating this: https://www.youtube.com/watch?v=japwBBodO8U According to the manual the fault light can appear for the following reasons: - Drive select error... Surely this would come on at the start? - Seek time out error... I'd have to hear the heads move first - Write current in heads during sector time error... Same as above - Loss of system clock... The fault light would be on from the start. - Write protect error... I don't think it got that far - Write data error... Same as above - Spin error... Is this the only remaining fault? So could the only cause be a spin error? I am wondering if the belt is slipping or something like that? Can anyone offer some advice? Thanks, Aaron. I saw the video. It seems that the motor runs and the disk spins up. As Tony suggests, check the possible fault sources. One obvious fault: is the head still locked? That?s the small metal plate fixed with one screw in the top right corner (IIRC). Long ago, I tried to run RK07 drives of the RK611 controller using a flat cable (not shielded), length 1 meter. The XXDP diags gave all sorts of errors that went away after I found the correct (shielded) cable BCxx. You are correct, the fault light will go on immediately when the drive is no connected to the controller. I *think* READY should come up even when no terminator is installed. One other possible fault. Are you sure the RL02 disk pack is OK? If it has been wiped with a magnet, it has become useless as a disk pack, but maybe useful for a ?wall clock platter?. READY will never light up, and possibly there is a time out. Not sure you can *hear* the head (carriage) move though ?