Pioneer MR, lockout, fans, and tuner
I could not fix my 503 CMX power supply, thanks to Pioneer refusing to give me a schematic for it, so I found a PDP 505 for $250 on Craigslist, and I'm happy with it. Its the one with the external media receiver, which I discovered is loud and read about that issue here too. I removed the cover and cleaned it out, and went to plug it back in before putting the lid back on to test it, I did not realize there is an interlock switch. I depressed the switch with my finger and it still would not come out of standby. I bypassed the switch all together thinking it may have been malfunctioning, and still nothing! I came to find out through Googling it has a "LOCK OUT" mode when the power is applied with the interlock open. Holy heck. Luckily I happened to stumble across the hidden procedure of 8 remote button presses for entering the service menu and resetting it. I ever meet the engineer who designed that "feature" I would like to punch him in the face. I thought I broke it. I've never seen something so absurd. Even the transmitters at work, which actually have lethal voltages, don't do that when the interlock is open.
Anyway, I was wondering if, since most of the heat seems to be generated in that tuner section, and I'm only using a single HDMI input on it, can I disconnect the power to the tuner section so I can then turn the fan to low speed without worrying about frying something? I could ask Pioneer but it seems hard to actually get a hold of a engineer over there, just people who answer emails without any real information.