Pioneer A400X help. How to uninstall the input switch?

[Huchiz]

Hi, I'm new here, and my English is no good, please be nice to me.

I just bought a Pioneer A400X to pair my Warfedale Diamond 9.1. The A400X is in quite good condition, except the selection switch is little loose from the panel. I mean the turning knob is still very tightly secured to the switch, but as a whole, they are little loose from the panel. I'm sure it has no effect to the performance. But just feel not so good when using.

I would like to know how to detach the turning knob from the frong panel/turning switch? I cannot find a screw on the knob. Shall I just PULL IT HARD? Anyone knows?

Plus, I have a user manual of A400X, anyone needs information, just let me know. Cheers.

[reddish75]

hi mate, what you need to do is pull the knob off the switch which will revel a nut ,just tighten this and jobs done.

[Huchiz]

Thanks, that was done.

[Huchiz]

Another issue,
I don found the volum potentiometer has a bit of noise on the left channel. I want to clean it, but don't to de-solider it if possible. Will this spary solvent work? http://www.jaycar.co.nz/productView....Max=&SUBCATID=

[jkeny]

Hi Guys,
Yes, Huchiz, that contact cleaner will work.

I need to replace my A400 vol pot & I believe it's the same as the 300 & 400X. Trying to find a replacement.

I see some ID markings on my pot but most are illegible - can you make out what's on yours?

They are ALPS pots & ID starts 02 & ends 063-A

[rabbitz]

It's Pioneer part ACT1077 but that probably will not help a great deal. BTW, it's a linear pot 50K-B1X2 and uses resistors on the PCB to do the log taper.

I'm pulling my A400X out tomorrow to go on ebay so will see if I can see some Alps numbers on it.

[jkeny]

Thanks Rabbitz,
My guess was wrong then - the 300 pot is not the same as the 400 & 400X. Mine is 100K log pot, I believe (but I've been known to be wrong)

If you get a chance to spot the 400X's vol pot markings, that would be excellent

Edit: Jeez, I just looked up the price of this part here http://www.ued.net/catalog/cat_item_idx_2904.html

$38 is a joke, right?

Rabbitz, did you get the part no from a service manual? I only have the schematics for the A400!

[Huchiz]

Hi guys,

That cleaner really works, it kills all the noise. lol

I will open the case again today to lookup the part marking, will post soon.

[rabbitz]

Had a look at the pot today and no more info than that shown on post #6 sorry. There's no Alps identifier on mine except for Alps Japan.

The marking detail came from the A400X service manual and I think there is a reference to it in the schematic.

Not only do these have 2 rows of 4 pins but they also have a leg out the back to ground the pot body as they are mounted on a plastic recess. If a pot is replaced, you have to be sure to ground the pot body.

[rabbitz]

$38 isn't a bad price as it would cost more to put a non standard pot in there and get it working.