schematic shows calibration pot as 5 k. It measures 4.88k. ..? resistor R14 to ground? schematic shows 1k, I see? marked 820 ohms and measure 798 ohms ..
resistor on top side of pot? R15 schematic shows 33k I see and measure 2.7k
there is 5 volts at the top of resistor R15. calibration pot center tap needs a little more voltage to move counter 2.5khz.
Any suggestions ???? I could replace R15 with 2k ohms .. ???? the 33k could be a mistake in the schematic..? can others verify ??
Robert
