Just an update, so replace the fuse, then did a voltage reading from the hot side, from these resistors that are series from the main cap, RM819 378V - 251V, RM820 251V - 171V, RM821 171V - 109V, RM822 109V - 59V, RM823 59V - 2.5, RM824 2.5 - 0V. If I remove these SMD resistor, can I replace them with the regular resistor with the same value? Also if that is possible, what is the wattage should I use? It is not indicated on the diagram, for example the RM819 it says 200KF/2012 so the replacement should be a 200k resistor? But what wattage should I use? Thanks guys, learning a lot from this forum.
I have removed these resistors and tested them and they are within tolerance, RM819 240K = 237K, RM820 240K = 237K, RM821 240K = 237K, RM822 200K = 197K, RM823 200K = 197K, RM824 11K = 10.83K.
Tried to do further voltage checking, with the icm801(mc33067) outout pin12 has a 14V but on the output pin14 I only have 0.29V, should it have the same output voltage? These output are going to the TM802 which I think will pass thru TM801S, the TM801S does not have any output. thanks again.
The 2.5V looks good at the end of the resistor chain so I would leave them in circuit. What voltage do you have on Pin 15 and Pin 5 of MC33067
The outputs at Pin 12 (Output B) and Pin 14 (Output A) are in opposition to each other. When one goes high the other low and vice-versa so that's not the problem.
hi dick, thanks for the response. well i still get the 15.04 on the vcc and on vref still getting 5.02. I see, learning new things. I though the ic is bad,
I forgot that I had already asked you for VCC and Vref.
In the picture (red arrow pointer) there's an electrolytic capacitor alongside the ICM801 which looks as though one leg is not soldered. Can you check it out.
thanks for the response, should I connect the mainboard and the inverter board as well? Or just screw in the power board to the chassis and do the test?
There is no need to connect anything to the power supply. Its a quick test with the power off to see if there is a problem on the secondary supply which could be stopping it from fully working. It just the resistance reading of each supply that's being checked.
thanks, did what you ask and here is my readings. DMM is set to x200
Test leads = Positive lead to ground and Negative to PINS.
24V = 91.6
13V = 97.1
12V = 0 or no reading
5.3V = 80.6
If I reverse the leads, I have no readings.
Thanks,
A reading of 0 = zero ohms which is a short circuit. If it is definately not OL, which is overload ie greater than x200, then you have a problem with ICM853 or CM858.
Can you measure the resistance of the 4 pins of ICM853
okay, remove the cm808, then tried to test it on capacitance set to X20n, without touching the lead my meter has 0.02, short the capacitor, then tried to test it, first reading was 1.27, then short it again to test, 1.26, reverse the test leads and short the cap again, 1.25 ans so on, I can't seem to get a consistent reading with this cap. I stop on 1.19
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