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A lot of times, the "Beep" - if it's been operated too many times, will actually burn out R185, that 4.7M or thereabouts - resistor. IT's a high value, so different times the chassis was "run" they changed the value of that resistor - so look for that "green band" as the multiplier and also it's around TR33...
Here's' a Snippet...
[ATTACH=full]40556[/ATTACH]

D71 controls the "peep" so if they disable the beep, D71 or that R185 - I'd look into figuring they may be bad.

C146 is a 10V 100uF - for a VERY LONG peep or a long duration "mute mode"

D69 supplied the power - so check that too...

[QUOTE="Handy Andy, post: 742726, member: 52309"] A lot of times, the "Beep" - if it's been operated too many times, will actually burn out R185, that 4.7M or thereabouts - resistor. IT's a high value, so different times the chassis was "run" they changed the value of that resistor - so look for that "green band" as the multiplier and also it's around TR33... Here's' a Snippet... [ATTACH=full]40556[/ATTACH] D71 controls the "peep" so if they disable the beep, D71 or that R185 - I'd look into figuring they may be bad. C146 is a 10V 100uF - for a VERY LONG peep or a long duration "mute mode" D69 supplied the power - so check that too... [/QUOTE]

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