Pioneer SX-650 Power Switch Cleaning

[seowsheng]

I thought I share my experience in cleaning the SX-650 power switch issue.

As usual, the symptom appeared when the light start to flicker and relay switching on and off. Searching the internet turn out to be power switch issue with x50 series.

I could not find exact photos or instructions on how to clean the switch for SX-650, so here you go.

1) Take the top cover off with power unplug
2) Take the bottom metal cover off too
3) Remove all the knobs from the faceplate
4) There are 2 nuts holding the faceplate, one on the power switch and the other on the selector switch
5) Another 2 screws on top holding the faceplate

Now you should have your faceplate off and here is the tricky part. Removing the black metal plate need a bit of patience and delicate hand. After removing all the screws that hold the black metal, you need to gently pull the tuner string in order to free the black metal plate.

Pioneer Sx-650 faceplate off

• seowsheng
• Jan 4, 2016

This is how it looks like with the faceplate off

Black metal piece off

• seowsheng
• Jan 4, 2016

With the amplifier upside down, it is easier to access the switch now.

Access to the switch

• seowsheng
• Jan 4, 2016

You can gently pull the switch off the chassis.

Easy access

• seowsheng
• Jan 4, 2016

Gently!

Remove the switch cover

• seowsheng
• Jan 4, 2016

The cover is hold by metal clip on four side, just need to straighten them to remove the plastic...

Switch cover off

• seowsheng
• Jan 4, 2016

This is how it looks like once the cover is taken off.

On/off Mechanism

• seowsheng
• Jan 4, 2016

Consist of 2 small spring and 2 plastic insert.

More carbon

• seowsheng
• Jan 4, 2016

No wonder the contact is poor.

30 over years of carbon

• seowsheng
• Jan 4, 2016

I reckon the previous owner didn't clean it at all.

Cleaned toggle

• seowsheng
• Jan 4, 2016

Cleaning with sand paper and some contact cleaner.

Cleaned toggle

• seowsheng
• Jan 4, 2016

The round edge is a bit hard to clean.

Carbon built up

• seowsheng
• Jan 4, 2016

This is how it looks like for an unclean switch, check out the amount of carbon build up.

Cleaned switch

• seowsheng
• Jan 4, 2016

Carbon removed with screw driver tip, cotton bud and some contact cleaner.

Clean toggle back

• seowsheng
• Jan 4, 2016

Put the metal toggle back in place carefully.

On/off mechanism back in place

• seowsheng
• Jan 4, 2016

Now carefully

Plastic gasket back in place

• seowsheng
• Jan 4, 2016

Make sure you have the plastic gasket back in place before putting the switch cover back.

Test the switch with multimeter

• seowsheng
• Jan 4, 2016

Before putting it all back together, it is good idea to test the switch with a multimeter, there...

Put it all back

• seowsheng
• Jan 4, 2016

Test power on and no more flickering... Sweet!

Hope this help those who have a SX-650 and needed to clean the power switch.

SS

 

[Watthour]

Great documentation of the repair. Thank you for sharing it.

 

[jkcoondog3]

I have a Pioneer SX-650 and my switch doesn't look like that. Similar, but the back plastic piece has no clips like the one you have. So I don't see how I can get into it without removing the 2 front screws on the switch and that might mean total disaster.

 

[Watthour]

Does the switch look like this?

If so, you may want to view this: http://audiokarma.org/forums/index.php?threads/we-can-rebuild-him-we-have-the-technology.372256/

 

[mike5656]

Hi I have a sx 550 with the same switch did this fix last