Hitachi HT-350 stuck in 45

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digthispig222
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Hitachi HT-350 stuck in 45

Post by digthispig222 » 16 Feb 2019 22:28

So I found a Hitachi HT-350 at a thrift store to replace my Onkyo CP-1010A which has broken anti-skate. Everything seemed to be fine with the Hitachi until I decided to clean the speed selector switch. I had disassembled that part to clean it. When I went to put it all back, the turntable wouldn't spin. I went back and changed the order of how things were, and now it does spin but only in 45 mode. What am I doing wrong?

nat
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Re: Hitachi HT-350 stuck in 45

Post by nat » 17 Feb 2019 00:11

You may need a new switch - when you say disassembled that part, what do you mean? Did you break it open or do you mean that part, as in section or area, of the turntable?
Any chance you've looked for a service manual in the library here? It might Help if there is one for the 350 or a similar model.

digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 17 Feb 2019 00:37

What I mean by disassemble, I mean that the switch mechanism has 2 oval-looking parts you have to stack on top of each other, with a circle part in between. All held down by nuts and washers. If I stack them in a certain way, it will spin but only in 45 speed no mater how I adjust the switch.

themisto462
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Re: Hitachi HT-350 stuck in 45

Post by themisto462 » 18 Feb 2019 14:20

Hello.

Let's see, if we could get your TT running again.... :D
digthispig222 wrote:
17 Feb 2019 00:37
If I stack them in a certain way, it will spin but only in 45 speed no mater how I adjust the switch.
  • Do all three plates sit plane on each other?
  • Is the little contact plate in the circle part in the right place? (See picture)
  • Did you squeeze the little contact plate too much when you cleaned it, so that it has lost its spring action?
S5002354.JPG
Speed selector switch - position is "33"
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digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 19 Feb 2019 01:20

OK, so are all three plates supposed to sit directly on top of each other? I noticed there was a thing that looked sort of like a cross between a washer and a nut (not sure what the name of that is) and wondered what it was for. Where are those supposed to go?

hobie1dog
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Re: Hitachi HT-350 stuck in 45

Post by hobie1dog » 19 Feb 2019 05:07

That was the first tt that I bought, sounds like you just didn't get it put back together correctly.

themisto462
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Re: Hitachi HT-350 stuck in 45

Post by themisto462 » 19 Feb 2019 11:58

digthispig222 wrote:
19 Feb 2019 01:20
OK, so are all three plates supposed to sit directly on top of each other? I noticed there was a thing that looked sort of like a cross between a washer and a nut (not sure what the name of that is) and wondered what it was for. Where are those supposed to go?
Here are some pictures showing how the parts belong together (click to enlarge):
S5002368.JPG
Speed selector switch
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speed selector switch_1.jpg
Exploded view
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digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 19 Feb 2019 22:50

Mkay, thanks a bunch for shedding some more light on this. I lost one of the nuts and one of the washers whilst working so that'll be fun lol. Let's see what I can do here...

digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 20 Feb 2019 00:37

OK new development: the nut and washer I lost are basically gone forever now. Anybody know what size to look for?

themisto462
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Re: Hitachi HT-350 stuck in 45

Post by themisto462 » 20 Feb 2019 12:05

digthispig222 wrote:
20 Feb 2019 00:37
OK new development: the nut and washer I lost are basically gone forever now. Anybody know what size to look for?
Those are sad news. :(

Did you search the work area with a magnet? If the nut and the spring washer were laying in the plinth, you should also check the magnet of the motor, as it is free accessible - maybe both already stick at it... .

If you still can't find them - the thread size is M2. Maybe you have a model shop around the corner, they should have them.

digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 20 Feb 2019 21:18

Alright so I ended up finding what I needed, screwed them all on, and now I'm getting nothing. How did you get the contact plate to sit perfectly in the circle part? That's probably where I'm going wrong.

themisto462
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Re: Hitachi HT-350 stuck in 45

Post by themisto462 » 20 Feb 2019 22:17

Strange. :-k

Is it possible, that the contact plate is mounted twisted around the longitudinal axis? That tiny, rectangular contact plate is made of a piece of sheet metal, to get a spring action (which is needed to get a full contact to the contacts in the upper and lower plate).
If it is twisted, it can't reach the contacts... .

Maybe you could post a picture of your switch, where I can see the circle plate and the contact plate.

digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 20 Feb 2019 22:48

Here's the best I can get anything to look like
Attachments
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digthispig222
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Re: Hitachi HT-350 stuck in 45

Post by digthispig222 » 20 Feb 2019 22:55

OK new development. I think I figured out our problem: that white wire broke! Does anyone have a picture of what it's supposed to look like? I think I can solder it back.

themisto462
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Re: Hitachi HT-350 stuck in 45

Post by themisto462 » 20 Feb 2019 23:35

The contact in the lower plate (where the white wire is soldered to) has slipped out of the plate and twisted about ~90°.
It should look like this:
Hitachi HT-350_speed switch.jpg
Lower plate
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