So I am restoring a Hitachi boombox. I noticed something that looks like a protection relay. Can it cause problems? Can it be cleaned? I am thinking about replacing it as a precaution. What do you think?
Relay
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This is a relay. I don't know what its purpose is. Could it be a speaker protection relay? I don't have the service manual. It's Hitachi TRK-8130E.Superduper said:
I already bought a replacement, but don't know if its compatible for sure. It is Fujitsu FBR111CD012 Input: DC. Contacts: SPDT. Contact Ratings: 3Amp. Coil Voltage: 12VDC. Coil Resistance: 390 Ohm . Mech Mtg: PCB 5 pin. Looks like below.
Oh, I'm not disputing that it's a relay. I'm merely saying I have never seen a relay in a boombox before. Ever. And I have seen a lot of boomboxes. And why do you want to change it? Is something wrong? If not, just wait until there is a problem. Might be never.
What could it be for? If Bobby's Datasheet is any indication, it's merely a single pole relay. I doubt it would be for speaker protection, would need 2 poles for that. More likely for switching of AC/DC operation but then again, without following the traces to see what is actually being switched, that little photo of the corner really can't tell us anything. If somebody has a schematic, we could find out pretty easily.
What could it be for? If Bobby's Datasheet is any indication, it's merely a single pole relay. I doubt it would be for speaker protection, would need 2 poles for that. More likely for switching of AC/DC operation but then again, without following the traces to see what is actually being switched, that little photo of the corner really can't tell us anything. If somebody has a schematic, we could find out pretty easily.
My Hitachi TRK-9300 makes a click noise a couple of seconds after you turn it on and off. Maybe it’s part of the on/off pop suppression circuitry??
The trk-9300 is a larger 3-pc unit right? But the one in question is a smallish 1-pc box. Jimmy, when you turn on your box, are the speakers muted until the click?jimmyjimmy19702010 said:
I don't want to cause panic on the forum but 40 year old relay is a ticking bomb and a dirty oneSuperduper said:
What does it mean 1-pc? Maybe it's a small boombox but I don't hear difference between this and my Hitachi TRK-8080e, which is how many pc?Superduper said:
What does it mean 1-pc? Maybe it's a small boombox but I don't hear difference between this and my Hitachi TRK-8080e, which is how many pc?1 piece - speakers and main cabinet all in 1 piece.sssboa said:I don't want to cause panic on the forum but 40 year old relay is a ticking bomb and a dirty oneThe trk-9300 is a larger 3-pc unit right? But the one in question is a smallish 1-pc box. Jimmy, when you turn on your box, are the speakers muted until the click?Superduper said:
3 piece - speakers housed in separate cabinets that attach to the centre cabinet.
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Oh, so there's no 2 piece I guessjimmyjimmy19702010 said:1 piece - speakers and main cabinet all in 1 piece.
3 piece - speakers housed in separate cabinets that attach to the centre cabinet.
So this is an interesting discussion. I've never seen a relay in a boombox before but then again, I only own a couple of Hitachi's & those I have don't employ them since being a mechanical component, they aren't as reliable as a solid state solution. For example, the Sanyo M9990 uses a solid state switching solution using a pair of power transistors to do the switching. It would've been much simpler to do it with a relay but since boomboxes don't consume as much current as a home audio system, apparently the Sanyo engineers felt that the same task could be accomplished more reliably with solid state components.
Anyhow, after hearing of relays in Hitachi's, I browsed a few Hitachi service manuals and discovered that the 9140 uses a relay that apparently is for powering up the boombox when the cassette motor receives power. The 9900 also uses a relay but in this case, it appears to be the switch that powers up the boombox. It is also a 2-pole relay so there is another function which I didn't investigate further.
So, I guess in certain Hitachi's, there are relays. Anyone know of another major manufacturer that used relays in their boomboxes?
Anyhow, after hearing of relays in Hitachi's, I browsed a few Hitachi service manuals and discovered that the 9140 uses a relay that apparently is for powering up the boombox when the cassette motor receives power. The 9900 also uses a relay but in this case, it appears to be the switch that powers up the boombox. It is also a 2-pole relay so there is another function which I didn't investigate further.
So, I guess in certain Hitachi's, there are relays. Anyone know of another major manufacturer that used relays in their boomboxes?
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