Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!akgua!mcnc!decvax!ittvax!ittral!stottlem From: stottlem@ittral.UUCP (Bill Stottlemyer) Newsgroups: net.micro.cbm Subject: c64 cassette problems Message-ID: <378@ittral.UUCP> Date: Tue, 6-Mar-84 13:17:04 EST Article-I.D.: ittral.378 Posted: Tue Mar 6 13:17:04 1984 Date-Received: Thu, 8-Mar-84 07:21:22 EST Lines: 27 Thanks to everyone who responded to my request for cassette loading problems. Most of the solutions suggested moving the cassette deck away from the monitor/tv. I had, of course, already tried this. It didn't help. I was primarily interested in learning the technique of adjusting the head azimuth. I know how to do this on analog decks but digital decks present a real problem. Where do you look to determine if the high freq response is optimum? You can't look at the output- it's aready squared up by the logic circuitry. You can't look at the head terminals- not enough signal there. Does the cassette deck use a high gain pre-amp (i.e op amp) input stage? The output of this stage would be the ideal place. Can anyone supply me with a copy of the cassette deck schematic? I can't seem to locate a copy in any of my Commodore papers. While investigating this problem, I opened the cassette case to take a look see. I found several bad solder connections on the PC board. Under one glob of solder I found a small star washer shorting two adjacent pc tracks. (So much for Commodore's quality assurance). This deck looks like it had been returned for repairs and the technician used a blowtorch. I resoldered the PCB and checked it out with a magnifying lens. Finally, I adjusted the head azimuth ( without using a scope). The unit seems to perform much better now. I still encounter an occasional load error but I guess I can live with it. Again, Thanks to all who took the time to respond. Bill Stottlemyer