Hitachi HT354. Turntable won't stop. - UK Vintage Radio Repair and Restoration Discussion Forum

ssnjimb · 11th Sep 2021, 6:41 pm

Hello

I have a Hitachi HT 354 Turntable.

It wont switch off be it auto cut or cut. it just keeps rotating even when the record has finished.

Thankyou in advance
James

analogadikt · 11th Sep 2021, 7:05 pm

There should be s microswitch inside and that is not working now. You shall have to open it up to check if the problem is with the acutateing mechanism or the switch itself.

Regards,

ssnjimb · 11th Sep 2021, 8:15 pm

How should i do that? I have never opened it up before.

Restoration73 · 11th Sep 2021, 9:42 pm

If in doubt, read the service manual (registration required)

https://www.vinylengine.com/library/...i/ht-354.shtml

ben · 12th Sep 2021, 1:09 am

If this uses an AC mains motor, I suppose a suppressor cap on the switch might have failed s/c. You'll be able to check this once inside!

analogadikt · 12th Sep 2021, 9:12 am

Quote:

Originally Posted by ben

If this uses an AC mains motor, I suppose a suppressor cap on the switch might have failed s/c. You'll be able to check this once inside!

It is a direct drive DC servo motor.

Regards,

hayerjoe · 14th Sep 2021, 9:51 am

Quote:

Originally Posted by ssnjimb

Hello

I have a Hitachi HT 354 Turntable.

It wont switch off be it auto cut or cut. it just keeps rotating even when the record has finished.

Thankyou in advance
James

I had this exact same problem on a mid-70s Sanyo deck just recently. I replaced the microswitch and still it ran! the culprit was a failed capacitor across the switch, it had failed and the circuit was therefore always connected

You need to take the deck out (find a manual) then look for the underdeck on/off switch (usually operated by a lever), it may be the switch or trace wiring further back to see if a capacitor has failed

Good luck

ssnjimb · 15th Sep 2021, 6:58 pm

Hello.

Thank you for the replies.

It now turns on and off at the start of the record as it should, but it won't turn off when it is at the end of the record.

James

ben · 15th Sep 2021, 7:27 pm

You need to take a look at the trip pawl or whatever system is used mechanically to activate the end stop. Likely hard grease stopping free movement of something. photos would help.

ssnjimb · 15th Sep 2021, 7:35 pm

attached are pictures as requested

Audio1950 · 15th Sep 2021, 7:44 pm

We really need to see a view around the centre spindle, from the top, with the turntable removed, as this is where the end trip is situated.

Barry

ssnjimb · 15th Sep 2021, 7:52 pm

ok. i will take those pictures when i am home on friday.

Thankyou
James

analogadikt · 16th Sep 2021, 7:36 am

It should be clarified if the tonearm returns to rest but the motor does not stop or the auto return/stop function does not activate at all.

Regards,

ssnjimb · 16th Sep 2021, 6:45 pm

The Auto return is not working.

James

Michael Maurice · 17th Sep 2021, 6:39 am

What you can do, with the turntable removed is turn the spindle clockwise and at the same time engage the large cog and see if it rotates.

As has been said it could be that its seized due to hardened grease, or it may be that the cog thats attached to the spindle has cracked and therefore not turning with the spindle.

11th Sep 2021, 6:41 pm	#1
ssnjimb Tetrode Join Date: Dec 2006 Location: Evesham, Worcestershire, UK. Posts: 83	Hitachi HT354. Turntable won't stop. Hello I have a Hitachi HT 354 Turntable. It wont switch off be it auto cut or cut. it just keeps rotating even when the record has finished. Thankyou in advance James

11th Sep 2021, 7:05 pm	#2
analogadikt Tetrode Join Date: Aug 2010 Location: Mumbai, India. Posts: 98	Re: Hitachi HT354. Turntable won't stop. There should be s microswitch inside and that is not working now. You shall have to open it up to check if the problem is with the acutateing mechanism or the switch itself. Regards, __________________ Anwesh

11th Sep 2021, 8:15 pm	#3
ssnjimb Tetrode Join Date: Dec 2006 Location: Evesham, Worcestershire, UK. Posts: 83	Re: Hitachi HT354. Turntable won't stop. How should i do that? I have never opened it up before.

11th Sep 2021, 9:42 pm	#4
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Hitachi HT354. Turntable won't stop. If in doubt, read the service manual (registration required) https://www.vinylengine.com/library/...i/ht-354.shtml

12th Sep 2021, 1:09 am	#5
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Hitachi HT354. Turntable won't stop. If this uses an AC mains motor, I suppose a suppressor cap on the switch might have failed s/c. You'll be able to check this once inside! __________________ Regards, Ben.

15th Sep 2021, 6:58 pm	#8
ssnjimb Tetrode Join Date: Dec 2006 Location: Evesham, Worcestershire, UK. Posts: 83	Re: Hitachi HT354. Turntable won't stop. Hello. Thank you for the replies. It now turns on and off at the start of the record as it should, but it won't turn off when it is at the end of the record. James

15th Sep 2021, 7:27 pm	#9
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Hitachi HT354. Turntable won't stop. You need to take a look at the trip pawl or whatever system is used mechanically to activate the end stop. Likely hard grease stopping free movement of something. photos would help. __________________ Regards, Ben.

15th Sep 2021, 7:35 pm	#10
ssnjimb Tetrode Join Date: Dec 2006 Location: Evesham, Worcestershire, UK. Posts: 83	Re: Hitachi HT354. Turntable won't stop. attached are pictures as requested Attached Thumbnails

15th Sep 2021, 7:44 pm	#11
Audio1950 Dekatron Join Date: Nov 2008 Location: Whittlesey, near Peterborough, Cambridgeshire, UK. Posts: 3,763	Re: Hitachi HT354. Turntable won't stop. We really need to see a view around the centre spindle, from the top, with the turntable removed, as this is where the end trip is situated. Barry

15th Sep 2021, 7:52 pm	#12
ssnjimb Tetrode Join Date: Dec 2006 Location: Evesham, Worcestershire, UK. Posts: 83	Re: Hitachi HT354. Turntable won't stop. ok. i will take those pictures when i am home on friday. Thankyou James

16th Sep 2021, 7:36 am	#13
analogadikt Tetrode Join Date: Aug 2010 Location: Mumbai, India. Posts: 98	Re: Hitachi HT354. Turntable won't stop. It should be clarified if the tonearm returns to rest but the motor does not stop or the auto return/stop function does not activate at all. Regards, __________________ Anwesh

16th Sep 2021, 6:45 pm	#14
ssnjimb Tetrode Join Date: Dec 2006 Location: Evesham, Worcestershire, UK. Posts: 83	Re: Hitachi HT354. Turntable won't stop. The Auto return is not working. James

17th Sep 2021, 6:39 am	#15
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,229	Re: Hitachi HT354. Turntable won't stop. What you can do, with the turntable removed is turn the spindle clockwise and at the same time engage the large cog and see if it rotates. As has been said it could be that its seized due to hardened grease, or it may be that the cog thats attached to the spindle has cracked and therefore not turning with the spindle. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/