Hitachi HT-350 won't start normaly.

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dalex111
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Joined: 10 Jul 2017 13:19

Hitachi HT-350 won't start normaly.

Post by dalex111 » 24 Jul 2017 08:43

Hello.
Such a problem:
There is a turntable Hitachi HT-350.
The drive motor does not start when it is turned on. The disc makes 1/4 turn and stops. Starts only if run by hand. Next works properly.
If there are ideas I will be happy. Suggest what to do?
Thank you.
Attachments
hitachi_ht-350.jpg
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tezzating
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Re: Hitachi HT-350 won't start normaly.

Post by tezzating » 24 Jul 2017 17:32

When you spin it by hand it frees up the binding, so it'll run fine until it sits an extended time, which makes me think the grease inside the motor has broken down. Get the service manual, open it up and clean & grease the motor to start.

dalex111
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Joined: 10 Jul 2017 13:19

Re: Hitachi HT-350 won't start normaly.

Post by dalex111 » 25 Jul 2017 06:14

I already changed the lubricant in the engine. The disk rotates easily. But this did not solve the problem.

themisto462
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Re: Hitachi HT-350 won't start normaly.

Post by themisto462 » 01 Mar 2018 22:55

I know, this topic is a bit older, but maybe any Help is still needed...

This problem seems to occur more often with the turntable. Over the past years, I've had seen so many offers at the famous auction side or the local classifieds with a similar problem description.

And even my HT-350 had the same problem some time ago. The platter needed a little nudge to run. After some measuring of the electrical components on the circuit boards, I came to the conclusion, that two capacitors were faulty. The "bad boys" were the C01 (22µF/10V) and the C02 (0,01µF/400V). After replacing those, the turntable worked normally again.
Screenshot-2018-3-1 Hitachi-HT-350-Service-Manual pdf.jpg
Location of the capacitors
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Screenshot-2018-3-1 Hitachi-HT-350-Service-Manual pdf(1).jpg
Location of the capacitors in the circuit diagram
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Best regards.

Gramotey
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Joined: 26 Jun 2017 22:10

Re: Hitachi HT-350 won't start normaly.

Post by Gramotey » 13 Mar 2018 21:53

Thank you so very much!
I figured that some cap(s) could be a problem, but way... yeah, thank you for figuring it out! I am going to try this tonight.

All the blessings to you! [-o<
themisto462 wrote:I know, this topic is a bit older, but maybe any Help is still needed...

This problem seems to occur more often with the turntable. Over the past years, I've had seen so many offers at the famous auction side or the local classifieds with a similar problem description.

And even my HT-350 had the same problem some time ago. The platter needed a little nudge to run. After some measuring of the electrical components on the circuit boards, I came to the conclusion, that two capacitors were faulty. The "bad boys" were the C01 (22µF/10V) and the C02 (0,01µF/400V). After replacing those, the turntable worked normally again.
Screenshot-2018-3-1 Hitachi-HT-350-Service-Manual pdf.jpg
Screenshot-2018-3-1 Hitachi-HT-350-Service-Manual pdf(1).jpg
Best regards.

cbxade
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Joined: 12 Apr 2018 18:34

Re: Hitachi HT-350 won't start normaly.

Post by cbxade » 02 Nov 2018 22:15

Hi Gramotey, did replacing the caps do the job as i am having the same issue ?
Thank you

power winder
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Re: Hitachi HT-350 won't start normaly.

Post by power winder » 03 Nov 2018 22:26

Hi. I am new to this site, so please bare with me.
I have a Hitachi ht350, I gave the tt a little nudge and it spun just a 1/4 turn, I looked at the comments and replies for this fault, and I found that the capacitor #2, is open circuit, or at least it seems to be, I have a digital meter which only has ohms.
The capacitor in circuit states it is 125v, but the diagram states 400v,.
how can I be sure this cap is good/no good

themisto462
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Re: Hitachi HT-350 won't start normaly.

Post by themisto462 » 04 Nov 2018 10:44

Hello and welcome to vinylengine.
power winder wrote:
03 Nov 2018 22:26
The capacitor in circuit states it is 125v, but the diagram states 400v,.
The rated voltage depends on the country and its mains voltage, where the TT is used. For USA and Canada, the value is stated 125V, for Europe, Asia etc. it is 400V.
Screenshot_2018-11-04 Hitachi-HT-350-Service-Manual pdf.png
Snapshot of the service manual
(207.42 KiB) Downloaded 96 times
power winder wrote:
03 Nov 2018 22:26
how can I be sure this cap is good/no good
Here is a guidance, how to check a capacitor with a multimeter without capacitance measurement:
https://translate.googleusercontent.com ... z3L0FTuZPQ

I hope this helps.

Regards.

power winder
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Re: Hitachi HT-350 won't start normaly.

Post by power winder » 11 Nov 2018 22:29

Thanks for the quick reply, do you have any idea where I can purchase one of these, I see it is supposed to be a metaled film capacitor, can it be changed for something other than that, only I cannot find the correct capacitor with all the correct numbers, etc.

cbxade
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Joined: 12 Apr 2018 18:34

Re: Hitachi HT-350 won't start normaly.

Post by cbxade » 11 Nov 2018 22:53

power winder wrote:
11 Nov 2018 22:29
Thanks for the quick reply, do you have any idea where I can purchase one of these, I see it is supposed to be a metaled film capacitor, can it be changed for something other than that, only I cannot find the correct capacitor with all the correct numbers, etc.
Hi, try https://uk.rs-online.com for any caps. Usually pretty good

hobie1dog
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Re: Hitachi HT-350 won't start normaly.

Post by hobie1dog » 12 Nov 2018 01:47

The HT-350 was my first turntable, still wish I would have kept it.

power winder
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Re: Hitachi HT-350 won't start normaly.

Post by power winder » 12 Nov 2018 16:09

I have looked on there site and I am not able to find the exact type, can it be changed for another type?
Can you please Help me, is s uf, larger or smaller than a puf.


power winder
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Re: Hitachi HT-350 won't start normaly.

Post by power winder » 13 Nov 2018 19:49

Thank you for your assistance, I will look at these.

power winder
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Re: Hitachi HT-350 won't start normaly.

Post by power winder » 17 Nov 2018 04:33

if I purchase capacitors that are not marked pos or neg, like those in the listing, how will I tell which is pos?.

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