Marantz 2245 only 32V at main filter caps

[FRANKPIETTE]

Hi i just got a Marantz 2245, i measured the voltage at J805 on power supply to adjust at 35V and it was around 29V, i adjusted the trimmer and it maxed at 32.6, then i checked at main filter caps and it was around 32 also. The receiver is untouched. Anything else than the main filter caps age, could give me that problem? Thank you !

 

[DatunWalnut]

Going back to basics: Are you on dim bulb? That would lower it a bit. Is the neg rail reading correctly?
Also, is the transformer original and set up for your country's voltage? Measure the AC on the output of the traffo and compare with the service manual to be sure. Check the label on the back and if you have a voltage input select switch in the panel, check that it's pointing to your required mains voltage. If all the above are correct, then you need to know if something later on in the amp is pulling it down. Disconnect at J805 and see if the voltage returns.

 

[FRANKPIETTE]

Going back to basics: Are you on dim bulb? That would lower it a bit. Is the neg rail reading correctly?
Also, is the transformer original and set up for your country's voltage? Measure the AC on the output of the traffo and compare with the service manual to be sure. Check the label on the back and if you have a voltage input select switch in the panel, check that it's pointing to your required mains voltage. If all the above are correct, then you need to know if something later on in the amp is pulling it down. Disconnect at J805 and see if the voltage returns.

Yes on DBT' it was on Variac up to 120. I used a100w bulb. 2 things i noticed, bulb has a red dim glow remaining at 120V after initial surge, 2-I felt a little tickling on my wrist touching it when i turned i off, also had to go to an event just got back. This unit has the 5 different voltages on a bus, no selector switch. Was mainly going your way but prefered to ask first. The unit is almost like the day it came out of it's box not a spek of dust at first glance, I'll empty it at the main caps, and make sure the connection are ok according to s. manual for my region and rightness, bought it around, ok will measure AC out of Tran, hoping right, if good i'll disconnect J805 to check if it comes back to 35V. Thanks D. will be back later with results, starting my prayers that the transfo is all right.

 

[FRANKPIETTE]

Negative rail was the same -voltage as on the positive rail, i'm looking at the schematic i found there's a few mistake, circled in Yellow Main are 9000uF not 6800uF. Also a diode symbol is reversed upper. Can't find/figure out the AC voltages from the transfo. Will measure +/- rails at J760 and 754 tommorow. Playing with the trimmer from right amp, i was able to make the dim glow go.

 

[DatunWalnut]

Playing with the trimmer from right amp, i was able to make the dim glow go.

That makes sense. I like to turn my trimmers down when working on an amp any way. Taking the strain off the power transistors. Good work finding the schematic fault. Your schematic looks better than mine.