Yamaha c4 power supply problem?

[Edu1985]

After replacing 99% of the caps in the c4 with elna silmics and nichicon for the bp i ve waited for the burn in off the caps to finish and took the measures of the voltages and i get these values

On the +45 i get + 42.5 to + 43 (fluctuates in the course of minutes)
-45 i get - 41.5 to - 42 (fluctuates in the course of minutes)
+12 i get + 21
-12 i get - 22
+30 i get +30
-30 i get - 30
I should point that with thw original 3 big caps the voltages were closer to the specified ones .they were +44 and - 43.
Could this be a potential problem in the psu?could it be that the silmics are not a good choice for the psu?or is there a problem in the psu?i also should mention that in the psu i didn t replaced 2 caps:10uf 50v bp caps.they are still the origi al ones.i thought they were normal caps and when i got into the psu i found that they are bp so i didnt have bp and let the originals in there.

 

[petehall347]

what cap id did you change ?
where are you measuring voltages from exactly ?

 

[petehall347]

test all fuses

 

[Edu1985]

I change all caps except 2 bp in the power supply next to 3 big ones.the voltages are measaured on the hardwire.i took picture

 

[petehall347]

can you point out where +12v is on schematic ?

 

[avionic]

can you point out where +12v is on schematic ?

- 20-21 volts is normal for the -12 test point. Look at the collector voltage in the schematic of TR623................. -12 is a typo. Should have been -21. Look at the AC off of the power transformer feeding that 21 volts. Its 19.5VAC..

 

[avionic]

+12 i get + 21

??

There is not a +12 test point thats relavent .

 

[petehall347]

??

There is not a +12 test point thats relavent .

thats what is throwing me .

 

[avionic]

thats what is throwing me .

Theres isn't even a + 12vdc (+21vdc) supply voltage.

 

[avionic]

Oh. Yamaha messed up the circuit board silkscreen as well and marked it -12..