Pioneer SA 520 display woes - UK Vintage Radio Repair and Restoration Discussion Forum

Chittaway · 25th Nov 2020, 10:23 pm

Hi all,
I'm new to to this forum and hope somebody can help me out,
I have a Pioneer SA 520 amp, all works fine except for the display panel which involves speaker meters and connected items, (buttons work ok), it all worked fine before I put it away some 4 years ago.
Any advice or assistance would be greatly appreciated as my OCD says they should work

Cheers
Mick

Diabolical Artificer · 26th Nov 2020, 7:13 am

First check for loose connectors, check switches are working correctly if there's nothing obvious then get a manual or schematic, this will hopefully help track the issue down.

Andy.

trsomian · 26th Nov 2020, 8:45 am

It appears to have a fluorescent display, so it may be that the supply to the display itself has failed. It seems to have a small transformer for this, so I would check the voltages around it, and, of course, don't forget to have a meter that will read AC rather than DC. The circuit diagram is available on HiFi Engine

Chittaway · 27th Nov 2020, 9:59 pm

Thanks Diabolical Artificer,
all switches work ok, connections are tight, another reply suggests transformer for the display

Thanks trsomian
will definitely check it out I figured it could be transformer, haven't stripped it right down yet will do and check for possible dry loints
Cheers
Mick

25th Nov 2020, 10:23 pm	#1
Chittaway Diode Join Date: Nov 2020 Location: Chittaway Bay, New South Wales, Australia Posts: 2	Pioneer SA 520 display woes Hi all, I'm new to to this forum and hope somebody can help me out, I have a Pioneer SA 520 amp, all works fine except for the display panel which involves speaker meters and connected items, (buttons work ok), it all worked fine before I put it away some 4 years ago. Any advice or assistance would be greatly appreciated as my OCD says they should work Cheers Mick

26th Nov 2020, 7:13 am	#2
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,667	Re: Pioneer SA 520 display woes First check for loose connectors, check switches are working correctly if there's nothing obvious then get a manual or schematic, this will hopefully help track the issue down. Andy. __________________ Curiosity hasn't killed this cat...so far.

26th Nov 2020, 8:45 am	#3
trsomian Hexode Join Date: Oct 2010 Location: Box End, Beds. UK. Posts: 271	Re: Pioneer SA 520 display woes It appears to have a fluorescent display, so it may be that the supply to the display itself has failed. It seems to have a small transformer for this, so I would check the voltages around it, and, of course, don't forget to have a meter that will read AC rather than DC. The circuit diagram is available on HiFi Engine

27th Nov 2020, 9:59 pm	#4
Chittaway Diode Join Date: Nov 2020 Location: Chittaway Bay, New South Wales, Australia Posts: 2	Re: Pioneer SA 520 display woes Thanks Diabolical Artificer, all switches work ok, connections are tight, another reply suggests transformer for the display Thanks trsomian will definitely check it out I figured it could be transformer, haven't stripped it right down yet will do and check for possible dry loints Cheers Mick