Pioneer SX-1010, 939, 838, et.al., Relay Replacement

[mattsd]

For the soft start relay on the 1050, use 653-LY2-DC48 and swap the old case onto the new relay. For the protection relay:

SX-1050
(the SX-1050 is a rare use of this particular relay,
but because it has a second chassis mount soft start relay
it is listed twice, once in this post, because only 3 models use it.)
4pdt pcb mount 48v 653-MY4-02-DC48 MOUSER.COM stock level 38 @ $8.11

 

[cuda440]

Okay, thanks! I should have been able to tease that out if the thread(s) myself, but I couldn't seem to do it.

Mouser order placed.

 

[TMaster]

Just updating the thread that the old cover from the SX-1010 relay does fit on the new LY2F-DC24 relay. You just have to rotate the cover 180 degrees and it goes on perfectly. No more standoffs.

 

[markthefixer]

There were different vendors that made those original relays, so it is always a "try it, but don't COUNT on it" situation. Which is why I never pushed hard on that angle.

 

[larryderouin]

I've done the same thing in the 737/939/1010, but ONLY if they are the clear cased OMRON's. The other brands won't do this, so Marks caution is warranted. It all depends on who made the original relay.

 

[sregor]

I've done the same thing in the 737-939/1010, but ONLY if they are the clear cased OMRON's. The other brands won't do this, so Marks caution is warranted. It all depends on who made the original relay.

Off topic, but windows treats the 737-939/1010 as a phone number, and wants to know if I wanted to use skype to call it when I clicked on it... Okay - back to an excellent thread.

 

[larryderouin]

Off topic, but windows treats the 737-939-1010 as a phone number, and wants to know if I wanted to use skype to call it when I clicked on it... Okay - back to an excellent thread.

EDITED POST 65 to SHUT WINBLOWS/SKYPE UP.

 

[Watthour]

And yet another option using a Schneider/Magnecraft relay:

https://www.alliedelec.com/product/schneider-electric/rxze2fa/70335296/

 

[markthefixer]

just as a BTW, in 1979/1980 I was working for Magnecraft when they were on the NorthWest side of Chicago.
developing / computer automating their relay test equipment. This was when the 16 bit uComps were coming out (8086, 8088).
I was as likely to be found at a bridgeport in the machine shop as a logic analyzer and scope in the lab.

 

[Watthour]

Somehow I can visualize that. Sounds familiar, too.

 

[merlynski]

Any suggestions for the ASR-025 softstart relay in the M-22?
Thanks!

 

[markthefixer]

Any suggestions for the ASR-025 softstart relay in the M-22?
Thanks!

We used to be able to track what other models the parts were used in, with: https://parts.pioneerelectronics.com

Sure would help with some particulars. What other models used the ASR-025?

Looks like it uses one per channel, at 24v dc dpdt chassis mount. looks like 1 watt core.... hmmm, they're ASR-026!! RIGHT... you said soft start...

120v, half wave rectified, 1k 5w resistor, 2.2uf 160v NP cap, 1 watt core is 2600 ohms, 18.5mA

IF it's 48v, it looks like a 653-LY2-DC48

 

[merlynski]

We used to be able to track what other models the parts were used in, with: https://parts.pioneerelectronics.com

Sure would help with some particulars. What other models used the ASR-025?

Looks like it uses one per channel, at 24v dc dpdt chassis mount. looks like 1 watt core.... hmmm, they're ASR-026!! RIGHT... you said soft start...

120v, half wave rectified, 1k 5w resistor, 2.2uf 160v NP cap, 1 watt core is 2600 ohms, 18.5mA

IF it's 48v, it looks like a 653-LY2-DC48

Thank You.

 

[markthefixer]

Thank You.

That's NOT the last word, WHAT is the voltage across the coil when in operation?

edit - he responded in another thread that ALL THREE relays were marked 24v.

thus
that would be 653-LY2-DC24

 

[Young46]

Ive been following this thread as I am rebuilding my SX-1010. Yesterday I replaced the relay (MY4S-US-24DC) with an Omron LY2F 24VDC. I took both relays out of the housing and the new one popped right in to the original housing.

 

[fromnowon]

I was watching a youtube video on SX-939 restoration, by "xraytonyb".

There is a lengthy section on relays in Part I during which Tony puts a 1N4148 across two pins to protect a transistor from EMF. Considering this is one of the most referred to threads for SX-x3x relay advice I thought I'd post it to see if others think this is a good idea or not.

 

[merlynski]

GOOD IDEA, but IMHO, a 1N4148 is a bit wimpy for that application (Ifsm: 2A), I would use a 1N4001, 1N4004, they will take the surge current much better (Ifsm: 45A) . It will also, marginally, slow the relay release time.

 

[SaturationPt]

It is common to put a diode across the pins of a relay to protect them from the reverse-polarity spike that can happen as the electromagnetic field collapses, ... but the transistor powering the relay is already a diode, ... and a larger one than the 1N4148.

It’s IMO un-necessary but if it makes people feel good, at least go up to a larger diode.

Funny how most of these receivers survived 50 years without the diode and now they all need one.

 

[merlynski]

I would not pull a unit out of service to add one but I have personally seen a transistor fail when the relay driver transistor turned off. No diode, Literally before my eyes: transistor on, relay pulled in, transistor off, relay clicked off then on immediately and stayed on. Test showed transistor shorted C to E. YMMV. The faster the transistor shuts off, the higher the voltage spike.

 

[markthefixer]

It is common to put a diode across the pins of a relay to protect them from the reverse-polarity spike that can happen as the electromagnetic field collapses, ... but the transistor powering the relay is already a diode, ... and a larger one than the 1N4148.

It’s IMO un-necessary but if it makes people feel good, at least go up to a larger diode.

Funny how most of these receivers survived 50 years without the diode and now they all need one.

Funny how legacy errors get perpetuated, nay enshrined & worshiped, in history.