we speak of design engineers Ibanez company, well known Japanese manufacturer of electric guitars and musical instruments.
Just the reputation of the company itself had initially surprised me about an event which happened recently. It appears from a friend asking me to watch a distortion circuit for electric guitar, the Ibanez TS7, which seems to malfunction. Soon we realize that he accidentally reversed the polarity of the power supply, then you have found the cause of trouble trying to open the item damaged components. For the sake
I observed the wiring diagram of the circuit and discovered an interesting detail:
pedal is an item that costs about 50 €, the brand is well known, but there is no protection circuitry against reverse polarity. The scheme can be downloaded here, but you can see the interesting detail:
was sufficient to mount the diode in series with tPress for excellent protection. However, the designers chose to mount a bogus protection, in case of reverse polarity is faulty (and skip the diode becomes an open circuit) and after all the faulty circuit in the valley.
A great way to sell more distortion pedal, with the excuse that it still included a cover (not working)! Sti smart Japanese right? 
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