Thomson TTV 3575 P - Betacam SP - VU meter doesn't turn on - UK Vintage Radio Repair and Restoration Discussion Forum

CRavens · 15th Aug 2023, 1:51 pm

Hello,

Everything in this deck is working perfectly, except the VU meter that doesn't turn on. What could go wrong? I have a functional VU meter on a BVW 65 P, I could potentially use some donor parts, not the led meter though, looks slightly different probably because of the recorder/player difference in the decks audio monitoring, any suggestions? Thanks.

PS: The audio works and the level knobs too.

John123 · 16th Aug 2023, 3:31 pm

Assuming this uses a VFD, check the low-voltage AC heater supply (e.g +5V). If present, check the anode supply which is usually a high negative supply (e.g. -30v) normally fed to the display directly from the PSU, or in some cases, generated 'locally' by a DC-DC boost converter.

Check PSU health in general (caps, etc). And of course, those all-important fuses..

CRavens · 20th Aug 2023, 8:37 pm

I think I will try to swap boards first in that area and see what happens, thanks!

15th Aug 2023, 1:51 pm	#1
CRavens Diode Join Date: Aug 2023 Location: Lisbon, Portugal. Posts: 9	Thomson TTV 3575 P - Betacam SP - VU meter doesn't turn on Hello, Everything in this deck is working perfectly, except the VU meter that doesn't turn on. What could go wrong? I have a functional VU meter on a BVW 65 P, I could potentially use some donor parts, not the led meter though, looks slightly different probably because of the recorder/player difference in the decks audio monitoring, any suggestions? Thanks. PS: The audio works and the level knobs too.

16th Aug 2023, 3:31 pm	#2
John123 Heptode Join Date: Jan 2007 Location: Luton, Bedfordshire, UK. Posts: 891	Re: Thomson TTV 3575 P - Betacam SP - VU meter doesn't turn on Assuming this uses a VFD, check the low-voltage AC heater supply (e.g +5V). If present, check the anode supply which is usually a high negative supply (e.g. -30v) normally fed to the display directly from the PSU, or in some cases, generated 'locally' by a DC-DC boost converter. Check PSU health in general (caps, etc). And of course, those all-important fuses.. __________________ Regards, John

20th Aug 2023, 8:37 pm	#3
CRavens Diode Join Date: Aug 2023 Location: Lisbon, Portugal. Posts: 9	Re: Thomson TTV 3575 P - Betacam SP - VU meter doesn't turn on I think I will try to swap boards first in that area and see what happens, thanks!