K8009 not working

At power on all digits 00:00:00 are on, HH-Leds blinking, also LED131 with higher speed. Pressing SW1 or SW2 makes LED1 on Transmitter PCB to blink almost same fast speed. Thats all!

Make sure code of transmitter is set identical to code of receiver (JC1, JC2 or none on K8009, wire jumpers on transmitter).
Check if decoder information arrives on µ-controller (pin 1 & 3).

Re: K8009 (delivered fully mounted)

Hi, … - next stage … ( I would need an expert here … :slight_smile:)

The M8009 always stays in start mode (hr 00 blinking).
I cannot control it using the remote.

Working with the sceme of the unit shows:

All voltages are ok (board input, at the ZD’s, VDD’s= 4,66V, remote)

Pushing a remote button raises ZD3 to —> 1,6 V <— (at best setting of CV2 = rec. adj.)

Thats too low, I guess … isn’t it ?

As a result, the inputs of IC3 + IC4 only going to 1,6 Volt.
Therefore the outputs always staying at HIGH=4,66 V.

So, the inputs of IC2 (µProc) always staying at HIGH, too.

I can fully control the board, when I MANUALLY pull pin 3 or 1 of the µProc (IC2) to ground.

Q1: The activation signal at ZD3 = input of IC3+IC4 = 1,6V seems too low to toggle… is that right ?
Q2: I cannot think of reason for this … what can I check to find out … ?

thanks a lot
Apparillo :wink: