I'm with Juan - you shouldn't specify the cost of parts in this case. The reason why you couldn't sleep the previous night was that you charged $15 for a part that costed $0.1. The problem is that in some cases you should specify the cost of the parts used (e.g. when replacing output transformer in a tube amp, or a speaker) but in other cases you shouldn't do it. And you have to judge yourself in which cases you do it, and in which you don't. For example, lately I was fixing Apogee Duet recording interface with very common problem (hum on the output), which I found out that no one in the world (except Appogee service in the US) managed to fix. It took me 3 days to find out that the reason for the failure were several 0402 SMD resistors that were open. The cost of the resistors was something like $0.03 but in that case it wouldn't make sense to specify the cost of the parts to the customer. It's because I had to order 100 pcs of the resistor and I spent few days finding the problem. Additionally, I had to replace several 0402 resistors in a very tight space (not everyone can do it). The alternative was to send the interface to the US but this was so expensive that buying a new interface would be cheaper.
The conclusion is that specifying the cost of the parts in all possible cases is a bad habit. Sometimes the cost of the part is $0.01 but you work on the amp 3 days and you are the only one who knows which part out of thousands needs to be replaced. And you charge the customer for that knowledge and not for the part.
Mark
The conclusion is that specifying the cost of the parts in all possible cases is a bad habit. Sometimes the cost of the part is $0.01 but you work on the amp 3 days and you are the only one who knows which part out of thousands needs to be replaced. And you charge the customer for that knowledge and not for the part.
Mark
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