Philips N1700 problem. - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Snarf81 · 17th Jun 2020, 11:39 am

Hi Ben,
I not at home currently, but as soon as I get back later today I'll take some voltage measurements and let you know.

Cheers
Rich.

Snarf81 · 17th Jun 2020, 7:16 pm

Are these the measurements you were asking about Ben?

I'm not much good with a multimeter.

Cheers
Rich.

ben · 18th Jun 2020, 11:09 am

The first picture 31v would suggest there is the s/c I mentioned , but then the third pic shows 17v, no idea why this might be. Where's the black probe connected to?

Snarf81 · 18th Jun 2020, 11:18 am

The black probe was through a hole on the metal chassis of the vcr. There are three wires on the head motor/capstan motor connector block, I just put the red probe on each of the connector block pins. The 17v is what's going into the capstan motor, the 31v is what's seems to be going into the head motor, I'm guessing the middle wire is ground?

Regards,
Rich.

Snarf81 · 19th Jun 2020, 8:42 pm

Ah-ha.

Ben, it was that transistor you mentioned at fault! I swapped it for one from a scrap machine and Hey Presto.

I do need to get hold of a replacement Head Servo Module though as the one originally in this VCR is defective. I've swapped it for a good module from my other working VCR for the time being just so I can fully test it.

Thank you Ben for pointing me in the right direction, and to all who replied, it's much appreciated.

Regards
Rich.

ben · 21st Jun 2020, 10:19 pm

Well done for going in there and getting your hands dirty! Keep us posted on how things go.

Snarf81 · 22nd Jun 2020, 5:58 pm

Thanks, Ben.
After testing some more it kept shutting down, so I looked in the service manual and found that the other transistor needed changing. Changed that and no more shutting down. I wonder what will be next. Haha.

Cheers
Rich.

ben · 22nd Jun 2020, 6:03 pm

I wonder if the motor is drawing too much current, possibly slightly sticky?

Snarf81 · 22nd Jun 2020, 10:35 pm

It all seems ok now (fingers crossed). I played one of the tapes that was originally recorded on it from the late 1970s in the modified speed and it ran for 6 hours non stop. Next job is to clean all of the heavy nicotine staining off it internally and try to get hold of the A/V out modification.

Cheers
Rich.

17th Jun 2020, 11:39 am	#21
Snarf81 Heptode Join Date: Aug 2018 Location: Rogiet, Monmouthshire, Wales, UK. Posts: 615	Re: Philips N1700 problem. Hi Ben, I not at home currently, but as soon as I get back later today I'll take some voltage measurements and let you know. Cheers Rich.

17th Jun 2020, 7:16 pm	#22
Snarf81 Heptode Join Date: Aug 2018 Location: Rogiet, Monmouthshire, Wales, UK. Posts: 615	Re: Philips N1700 problem. Are these the measurements you were asking about Ben? I'm not much good with a multimeter. Cheers Rich. Attached Thumbnails

18th Jun 2020, 11:09 am	#23
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Philips N1700 problem. The first picture 31v would suggest there is the s/c I mentioned , but then the third pic shows 17v, no idea why this might be. Where's the black probe connected to? __________________ Regards, Ben.

18th Jun 2020, 11:18 am	#24
Snarf81 Heptode Join Date: Aug 2018 Location: Rogiet, Monmouthshire, Wales, UK. Posts: 615	Re: Philips N1700 problem. The black probe was through a hole on the metal chassis of the vcr. There are three wires on the head motor/capstan motor connector block, I just put the red probe on each of the connector block pins. The 17v is what's going into the capstan motor, the 31v is what's seems to be going into the head motor, I'm guessing the middle wire is ground? Regards, Rich.

19th Jun 2020, 8:42 pm	#25
Snarf81 Heptode Join Date: Aug 2018 Location: Rogiet, Monmouthshire, Wales, UK. Posts: 615	Re: Philips N1700 problem. Ah-ha. Ben, it was that transistor you mentioned at fault! I swapped it for one from a scrap machine and Hey Presto. I do need to get hold of a replacement Head Servo Module though as the one originally in this VCR is defective. I've swapped it for a good module from my other working VCR for the time being just so I can fully test it. Thank you Ben for pointing me in the right direction, and to all who replied, it's much appreciated. Regards Rich.

21st Jun 2020, 10:19 pm	#26
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Philips N1700 problem. Well done for going in there and getting your hands dirty! Keep us posted on how things go. __________________ Regards, Ben.

22nd Jun 2020, 5:58 pm	#27
Snarf81 Heptode Join Date: Aug 2018 Location: Rogiet, Monmouthshire, Wales, UK. Posts: 615	Re: Philips N1700 problem. Thanks, Ben. After testing some more it kept shutting down, so I looked in the service manual and found that the other transistor needed changing. Changed that and no more shutting down. I wonder what will be next. Haha. Cheers Rich.

22nd Jun 2020, 6:03 pm	#28
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Philips N1700 problem. I wonder if the motor is drawing too much current, possibly slightly sticky? __________________ Regards, Ben.

22nd Jun 2020, 10:35 pm	#29
Snarf81 Heptode Join Date: Aug 2018 Location: Rogiet, Monmouthshire, Wales, UK. Posts: 615	Re: Philips N1700 problem. It all seems ok now (fingers crossed). I played one of the tapes that was originally recorded on it from the late 1970s in the modified speed and it ran for 6 hours non stop. Next job is to clean all of the heavy nicotine staining off it internally and try to get hold of the A/V out modification. Cheers Rich.