Parasound HCA 2200ii Inquiries

[jsleonardo]

Hi,

Been searching the site about Parasound HCA 2200ii but did not find any schematic. I would like to ask about capacitors rated 0.05K 250 FULL PSB.
I'm listening to music then the power went down. After power up, I turn on the amp running few minutes but seen spark on the right channel. I turn off the amp immediately. I didn't test yet the components but would like to know where I can get the schematic and parts. See pictures.



Thanks in advance for the help.

 

[dblack4]

Hi,

Maybe it's just me but the bottom of the PCB under those 0.05K 250 caps looks cracked in several places.

 

[jsleonardo]

Hi,

Maybe it's just me but the bottom of the PCB under those 0.05K 250 caps looks cracked in several places.

Hi dblack4,

It's not a crack, it is solder of components. Here's the back of the PCB.
I tried replacing the defective capacitor but get burned again.
I already got the schematic from Tony of Parasound and the affected components are C516-C521.
I'm not sure what type of capacitors are these. The defectives are the axial types.

 

[jsleonardo]

Hi dblack4,

It's not a crack, it is solder of components. Here's the back of the PCB.
I tried replacing the defective capacitor but get burned again.
I already got the schematic from Tony of Parasound and the affected components are C516-C521.
I'm not sure what type of capacitors are these. The defectives are the axial types.

I replaced capacitors C517-C521 with same type even if the replaced components are still good.
Tried testing it and seems okay now. Listen at low volume for about an hour with no issues.

 

[Eltuuro]

Hi jsleonardo,

Which capacitors did you use as a replacement? Bit off topic here, but i am thinking about recapping the lot since I am having an audible hum through the speakers. You might find this thread also interesting.

Nichicon PW vs HE, how compared to Pany FC? - AudioKarma.org Home Audio Stereo Discussion Forums

I think I identified all capacitors mentioned in this thread, but I am having trouble indicating which transistors are being meant. It could be the Q501 and Q502 I am seeing on your pictures above. Any ideas?

Regards

Arthur

 

[Tonybo]

I sorted my hum problem when I found a few earthing problems. There is a lead that goes from the aluminium earthing plate that sits on top of the big filter caps and goes to the amps base plate. I noticed that there was a masked patch (bare metal) on one of the mounting screw positions on the base plate but that the earth lead was attached to a screw position that was actually painted. (These screws mount the sheet metal legs that support the aluminium plate, its hard to get at!). I moved that lead, tightened the screws on the plate itself and that fixed it. Absolutely silent now.