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Heck, When I was doing service calls 20-25 years ago most of our customers knew not to "fool around" in the back of a set whether it was on or off.
The interlock was helpful keeping people safe from most harm, (Those who were curious but knew nothing.)
Those that went past it (cheater cord) generally knew the pitfalls.
I refused to repair any sets without backs or bypassed interlocks that was company policy.
As far as service controls, If someone "fiddled" with them it didn't matter to me, As we still got the 19.95 for the call!
Personally, From a service standpoint I loved having the controls easily accessible at the back. Time was money and the faster and easier it was to do a set up and get on to the next call was fine with me. My favorite was the Motorola "works in a drawer" also called "junk in a drawer" by my boss!
That one was simple to set up, and almost everything could be done from the front of the set.
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