Combine that with over 40 years of miniaturisation, high level of circuit integrations inside chips, complex software functions and general confidentiality of the design. So without a schematic, other components being available and a lot of experience on this front you can do little with simple value lists.Īnalog equipment from the seventies usually had a book of service documentation and all kinds of reference measurements to troubleshoot. Capacitance value also, but voltage ratings, material characteristics and high-frequency behaviour are largely guesswork (put maybe very important in that part of the schematic)Īnd then you have the case of board versions, which could be complete redesigns or slight tweaks in component values (but for which reason).Īnd for the usual resistor or cap, if it's broken, it was probably caused by something else. Resistance value is simple to measure, after desoldering (which is effort). If you could sell the lists for profit it may be interesting, but most people won't be prepared to pay for it.Īnd apart from a limited use of such a list you can't simply measure a lot of important specs. It's simply a huge amount of work with very little use. Like all of the good things in life, the way things "should" be had to take a back seat to reality, because the reality is that there are too many people in the world who don't think things through and, given the opportunity, will make a great big expensive mess for someone else to clean up. ![]() If you take it apart, we'll still fix it for you, but it won't be covered under warranty." So rather than dicking around with it, and trying to fix what the customer broke and then try to figure out what broke first (which is very expensive) they just issued blanket policies: "If it breaks, leave it alone and send it back. It's something else entirely when they get a box of parts and they have to re-assemble everything and figure out what failed in the first place, and determine if it was a failure covered under warranty. ![]() ![]() It's one thing if your warranty repair techs are getting a complete item that they can methodically diagnose and repair. Bob Average, a reasonably competent handyman when it came to solid-state equipment, would have a problem with his drill so he'd take it apart, fiddle around with it until he realized it was an electronics-related failure and then send the unit in for "repairs" missing a bunch of parts and generally in an awful state. "No user serviceable parts" was a response to a rising trend back when electrical appliances started shifting from solid-state manufacturing to chip-level control.
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