TR-909 Lowtom and Closehat problems

[dancelwerk]

909 Lowtom and Closehat problems

Hello again to all,

I have a problem with the Lowtom of my TR-909, doesn't sound.

The circuit of the Lowtom is working, I know because when I program, for example the Midtom I put a wire from trig midtom to trig lowtom and the lowtom sounds and working. I think that the problem is because the lowtom trig is not coming to the circuit, ist perhaps the flip flop 4174 IC1?

I have other problem too, the hihat closed doesn't work too, only the open hihat, I think that ic1 control both trigger sounds, but I don't sure.

I did change in the hihat circuit Q72 and Q73, and the capacitor C135 without success. The Openhihat works perfect.

Any idea what should I be check?

Thanks in advance

Dancelwerk.