55trucker
New Member
Don't get me wrong. I'm not saying the Dolby board is not an issue. It definitely can be, especially on the earlier production models. What I'm trying to say is it is not the first place to go when you have a channel drop out in one of these receivers. Like any 40+ year old receiver, almost ANY of the switches, relays and pots can cause channel drop and this receiver has a lot of them. In many cases, it just needs to be cleaned, don't jump to the Dolby board.
Absolutely true. The early production units have the green flex pc boards connecting the push switches to the Dolby board. They are very fragile and tear easily when handled. Unfortunately it's hard to get access to the Dolby switch without moving those push switches out of the way.
This discussion has focused on the 9090 and 9090DB. With the excetion of the power supplies and output transistors, it all applies directly to the 8080 and 8080DB.
- Pete
It's been approx a year since i last posted with the Dolby issue with my 9090db.....(which as of yet has not been solved).
Pete how does one distinguish the year date of the improvements to the Dolby board?
Steve
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