After doing some sterling work for years, I have a fault code on my Konica Minolta Bizhub 200. It's getting on a bit but I still have a lot of toner and drum supplies for it and the print quality is still great, so I would like to be able to fix it up if possible.
The fault code is C3452: Fusing Warm-Up Failure (Sub). When I power up the machine, the fuser unit is indeed stone cold.
Going through the service manual troubleshooting, I determined that both heater elements have conductivity. It's a little difficult to get to the power board (PU1) to check output voltage to the fuser, but I saw from the traces of the power board, the main mechanical control board (PWB-A) commands PU1 to activate 2 opto-isolated triacs to operate to switch AC power to the lamps, on PJ4 pins 1-5 and 1-6 for each lamp, which is accessible from the back. Checking with the meter, there's nothing happening on them. So I guess PWB-A is not commanding the lamps to come on.
So the official process is to replace PU1 and then replace PWB-A if that doesn't help. I'd like to at least do some basic troubleshooting to determine which board is at fault before forking out my limited monies. My gut is not helping me here since the machine *is* starting up and making the right noises during start up so PU1 is powering up and PWB-A is doing some stuff like operating fans and the like, and the display activates and shows that it is starting in the usual manner. The print on PU1 says it generates a number of voltages (24V, 5.1V, 3.35V and 12V), and they say always start by checking voltages. However, it doesn't indicate any test points or where I might look for these voltages. It's a bit difficult to access when installed and connected up.
Anyone have any ideas or other troubleshooting tips for this?
The fault code is C3452: Fusing Warm-Up Failure (Sub). When I power up the machine, the fuser unit is indeed stone cold.
Going through the service manual troubleshooting, I determined that both heater elements have conductivity. It's a little difficult to get to the power board (PU1) to check output voltage to the fuser, but I saw from the traces of the power board, the main mechanical control board (PWB-A) commands PU1 to activate 2 opto-isolated triacs to operate to switch AC power to the lamps, on PJ4 pins 1-5 and 1-6 for each lamp, which is accessible from the back. Checking with the meter, there's nothing happening on them. So I guess PWB-A is not commanding the lamps to come on.
So the official process is to replace PU1 and then replace PWB-A if that doesn't help. I'd like to at least do some basic troubleshooting to determine which board is at fault before forking out my limited monies. My gut is not helping me here since the machine *is* starting up and making the right noises during start up so PU1 is powering up and PWB-A is doing some stuff like operating fans and the like, and the display activates and shows that it is starting in the usual manner. The print on PU1 says it generates a number of voltages (24V, 5.1V, 3.35V and 12V), and they say always start by checking voltages. However, it doesn't indicate any test points or where I might look for these voltages. It's a bit difficult to access when installed and connected up.
Anyone have any ideas or other troubleshooting tips for this?
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