fluke 83 constant continuity

[glinjik]

Hi guys anyone any idea why fluke 83 is in constant continuity as soon as i push the button for continuity it goes constant beeping i thought maybe the input jacks were done but even with the input jack block removed same result i have check components cant find a thing the selector switch seems OK I'm baffled all other measurements re normal IM getting to the point of putting it in the bin and getting a uni-t lol

[ogdento]

i encourage you to keep at it!  these can be a pain to fix but it's very satisfying once you do.

if all the other measurement ranges (ohms, volts, etc, and you've verified 10M dcv input impedance) are working than I'd probably start with the piezo driver:

if you look at the schematics you'll see U4 pin 15 (signal p23) goes to the base of Q9 to drive the beeper... is the p23 signal turning on/off when you change the continuity button?  if so, q11 could be bad.  if not, check the other piezo driver bits (see section 2-18 in the service manual)

[glinjik]

thank you fo your reply i nave a AVO tt169 here so tomorrow will check all transistors