Pioneer SX 450 recap -- need parts list

[sghee44]

Hello, I am starting an SX 450 recap and need to know what parts to buy. Thanks for your help.

 

[mattsd]

Pioneer SX-450 recap list

Pioneer SX-450 recap list

RF Board (AWE-074)

AWE-074: C203: 4.7uF 35v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWE-074: C204: 4.7uF 35v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWE-074: C207: 47uF 35v CEA: 647-UPW1V470MED 47uF 35v
AWE-074: C208: 47uF 35v CEA: 647-UPW1V470MED 47uF 35v
AWE-074: C209: 100uF 10v CEA: 647-UPW1C101MED 100uF 16v
AWE-074: C210: 100uF 10v CEA: 647-UPW1C101MED 100uF 16v
AWE-074: C217: .47uF 25v CSZA: 667-ECQ-V1H474JL .47uF 50v
AWE-074: C218: .47uF 25v CSZA: 667-ECQ-V1H474JL .47uF 50v
AWE-074: C223: 1uF 35v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWE-074: C224: 1uF 35v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWE-074: C225: 47uF 10v CEA: 647-UPW1V470MED 47uF 35v
AWE-074: C226: 47uF 10v CEA: 647-UPW1V470MED 47uF 35v
AWE-074: C229: 100uF 35v CEA: 647-UPW1V101MPD 100uF 35v
AWE-074: C230: 100uF 35v CEA: 647-UPW1V101MPD 100uF 35v
AWE-074: C231: 1uF 25v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWE-074: C232: 10uF 25v CEA: 647-UPW1E100MDD6 10uF 25v
AWE-074: C235: .1uF 35v CSZA: 667-ECQ-V1H104JL .1uF 50v
AWE-074: C236: 100uF 35v CEA: 647-UPW1V101MPD 100uF 35v
AWE-074: C237: 47uF 25v CEA: 647-UPW1V470MED 47uF 35v

Q201: 2SA725: 512-KSA992FBU
Q202: 2SA725: 512-KSA992FBU

AF Board (AWK-060)

AWK-060: C109: .33uF 35v CSZA: 667-ECQ-V1H334JL .33uF 50v
AWK-060: C110: .33uF 35v CSZA: 667-ECQ-V1H334JL .33uF 50v
AWK-060: C201: .47uF 25v CSZA: 667-ECQ-V1H474JL .47uF 50v
AWK-060: C202: .47uF 25v CSZA: 667-ECQ-V1H474JL .47uF 50v
AWK-060: C207: 220uF 6.3v CEA: 647-UPW1A221MED 220uF 10v
AWK-060: C208: 220uF 6.3v CEA: 647-UPW1A221MED 220uF 10v
AWK-060: C211: 47uF 25v CEA: 647-UPW1V470MED 47uF 35v
AWK-060: C212: 47uF 25v CEA: 647-UPW1V470MED 47uF 35v
AWK-060: C219: .47uF 25v CSZA: 667-ECQ-V1H474JL .47uF 50v
AWK-060: C220: .47uF 25v CSZA: 667-ECQ-V1H474JL .47uF 50v
AWK-060: C221: 220uF 35v CEA: 647-UPW1H221MPD 220uF 50v
AWK-060: C222: 470uF 16v CEA: 647-UPW1E471MPD6 470uF 25v
AWK-060: C303: 100uF 50v CEA: 647-UPW1H101MPD 100uF 50v
AWK-060: C304: 22uF 50v CEA: 647-UPW1H220MDD 22uF 50v
AWK-060: C305: 220uF 50v CEA: 647-UPW1H221MPD 220uF 50v
AWK-060: C306: 220uF 50v CEA: 647-UPW1H221MPD 220uF 50v
AWK-060: C307: 100uF 25v CEA: 647-UPW1V101MPD 100uF 35v
AWK-060: C311: 10uF 50v CEA: 647-UPW1H100MDD 10uF 50v

Q201: 2SA725: 512-KSA992FBU
Q202: 2SA725: 512-KSA992FBU
Q203: 2SA725: 512-KSA992FBU
Q204: 2SA725: 512-KSA992FBU

Main filter caps:

AWK-060: C309 and C310: 4700uF 35v, 25mm by 55mm L/S 10mm:

Panasonic THA: 667-ECO-S1JA472CA 4700uF 63v, 25mm by 50mm L/S 10mm

OR

United Chemi-Con KMH: 661-EKMH630VNN472MQ 4700uF 63v, 25.4mm by 50mm L/S 10mm

BOM List

667-ECQ-V1H474JL | 6
647-UPW1A221MED | 2
647-UPW1H221MPD | 3
647-UPW1H101MPD | 1
667-ECQ-V1H334JL | 2
647-UPW1V470MED | 7
647-UPW1E471MPD6 | 1
647-UPW1H100MDD | 1
647-UPW1H220MDD | 1
647-UKL1H010KDDANA | 3
647-UPW1V101MPD | 4
647-UKL1H4R7KDDANA | 2
647-UPW1E100MDD6 | 1
647-UPW1C101MED | 2
667-ECQ-V1H104JL | 1
512-KSA992FBU | 6

 

[sghee44]

This is great! Thank you.

 

[mattsd]

Filter caps added.

 

[jyobpner]

Thanks for the list here, indeed! I am working on my first unit... an SX-450... and this list will help. Is there a schematic out there that corresponds to your part numbers? (C208, Q203...) I would love to have it as well to reference and utilize.

Thanks.
Jim

 

[mattsd]

Get the service manual here: http://elektrotanya.com/pioneer_sx-450_sm.pdf/download.html

This wisdom manual will tell you all you need to know. Okay, not literally, but most questions can be answered by reading it.

 

[Alienz]

Does this include all electrolytics on the tunerboard too? I recapped most of my SX450 but i didnt do the ones around the tuning cap since i wasnt sure if it would cause tuning problems.

 

[mattsd]

No, the only ones I included on the RF board are the ones associated with the preamp, the tuner caps I left alone as replacing them can throw it out of alignment.

 

[Alienz]

No, the only ones I included on the RF board are the ones associated with the preamp, the tuner caps I left alone as replacing them can throw it out of alignment.

Thanks!
I did recap most of the phono pre-amp on that board (at least i assumed it was ). There are some caps near the front, near the EQ controls, am I right in thinking these are for the EQ and safe to replace?

I recapped the left board with panasonics and elnas left over from other projects, gonna order the rest of the caps soon, it already sounds so much better now!

Only thing left to do is clean that infamous selector switch, it hasnt caused me much problems yet but i'd like to have this receiver in full working order again one day.

 

[glenz66]

Hello - I was going to start my very first recap on the Pioneer SX-450. I hear that it is a good entry level piece and it needs to be done.
Would anyone be able to help me confirm how to order the parts listed in this thread from, lets say, Mouser Electronics. For example, do I just do a search for part (AWE-074: C203: 4.7uF 35v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v) on that website? Or is there more to it? Sorry in advance, I just need a ledge to grab hold of to start the climb.

With thanks,
Greg

 

[Watthour]

Use the manufacturer's part numbers to search. For example, the first item is AWE-074: C203: 4.7uF 35v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v. The Pioneer designation, values, and descriptions can be stripped out to leave the part number UKL1H4R7KDDANA. That should yield some results (it did for me when I just tried it at Mouser.com).

 

[larryderouin]

The Bill of Materials List is already done. (at the bottom of the list under "BOM LIST") Copy that and plug it in to the BOM Maker on Mouser. The ECQ's will need equivalents as they are being phased out as obsolete.

 

[glenz66]

Thanks for the lift, guys! I am now on my way to becoming a recap pro.

 

[Rob_Feature]

Pioneer SX-450 recap list

I know this is from a while back, but I'm about to do a recap of my SX-450 and it was great to find this list (thanks!). Normally when doing a recap, people tend to just suggest doing all the electrolytic caps. In this BOM list, however, it includes film caps and transistors (and maybe other non-electrolytic parts I missed?). Are these necessary to replace? Normally I don't see those in a cap list. Any insight on why those are recommended here?

Main filter caps:
AWK-060: C309 and C310: 4700uF 35v, 25mm by 55mm L/S 10mm:
Panasonic THA: 667-ECO-S1JA472CA 4700uF 63v, 25mm by 50mm L/S 10mm

Also, the main filter caps aren't in the BOM but I'm assuming I should replace those too? The way they're listed is a little confusing. The first item above shows its for C309 and C310 (which I believe are the main filter caps). Is this the correct replacement?

But the Panasonic THA below that...is that a 3rd filter cap (I must not have noticed it when visually inspecting the board)?

So does my full list include the BOM in the original list plus the 3 filter caps? (I'm not missing anything else?)

Thanks!

 

[Rob_Feature]

Just a bump before I place my order...if anyone's around that can offer insight on the last comment, that would be appreciated. Thanks!

 

[larryderouin]

The transistors are known problem children. The films are generally regarded as vast improvements on the minimally operable parts that were installed. Cost is mnimal, and time involved is low. Best to replace now than have to tear it all down later to replace parts that weren't on 1st blush.

The Filter caps: original spec's are on 1st line. 2nd line is the THA cap that meets or exceeds all specs, and is as close to original size as possible.

 

[dlucy]

There are additional tips and pointers in this SX-450 thread: http://www.audiokarma.org/forums/in...t-o-modding-a-pioneer-sx-450-receiver.709512/

 

[nathan bean]

Sorry to drag this thread up but I am in the process of recapping my sx-450 and have found a couple cap values that differ from the BOMs that are out there.

(RF Board) C209/210: My unit actually had 220uF@6.3v caps installed
(AF Board) C221: My unit actually had 470uF@35v cap installed here

Other units may have different values in those positions. My hope is that this will help those in the future at least decide to LOOK at the values in their unit before putting an order together.

 

[Young46]

Sorry to drag this thread up but I am in the process of recapping my sx-450 and have found a couple cap values that differ from the BOMs that are out there.

(RF Board) C209/210: My unit actually had 220uF@6.3v caps installed
(AF Board) C221: My unit actually had 470uF@35v cap installed here

Other units may have different values in those positions. My hope is that this will help those in the future at least decide to LOOK at the values in their unit before putting an order together.

I know manufacturers make changes during production runs and never document or change the schematic. I have repaired a fair amount of equipment and have learned to document every component removed and where it was removed from. I am just a hobbyist and am not qualified to say if those caps are right or wrong. They are a considerable increase in capacity though and I couldn’t tell you if or how they would affect the circuit. Might be worth investigating further unless you’re the original owner and it’s operated fine. Techs on here can give you advice.

 

[nathan bean]

I know manufacturers make changes during production runs and never document or change the schematic. I have repaired a fair amount of equipment and have learned to document every component removed and where it was removed from. I am just a hobbyist and am not qualified to say if those caps are right or wrong. They are a considerable increase in capacity though and I couldn’t tell you if or how they would affect the circuit. Might be worth investigating further unless you’re the original owner and it’s operated fine. Techs on here can give you advice.

I am also a hobbyist who lacks the technical knowledge to fully understand these circuits. The advice I've received from others on the forum is to default to the originally installed components that I pulled out of the unit (my unit had never been worked on), because those undocumented changes you mentioned during production runs were never officially recorded.

I'm learning as I go, and truly appreciate the collective knowledge on this forum!