problem

Difference of #658530 MAXI Delta and #60955 decoder.

(and problem comes from the difference.)

The #60955 MAXI high efficiency decoder has very high potential. So it is good idea to change the decoder from #658530 Delta to #60955, but there is a complicated problem comes from difference of these two decoders.

What's differ?

Please notice for the polarity of each outputs.

Relationship of 'direction arrow' on 6021 CU and pin outputs.

#658530 (Delta):

Direction	#3(motor)	#1(Lr)	#8(Lf)
/\	+0~ +20V	0V	+0~+20V
\/	-0~ -20V	-0V~-20V	0V

#4~#6 always connected to internal gnd.(0V).

#60955(high eff. digital):

Direction	#3(motor)	#6(motor)	#1(Lr)	#8(Lf)
/\	+0~+20V	Gnd	off	Gnd
\/	Gnd	+0~+20V	Gnd	off

All voltages are measured between internal ground.

What's problem?

The difference of motor outputs(#3 - #6) doesn't makes trouble, that's why it makes same act for a DC motor.
If head lights are conventional bulb there's also no problem.
If head lights are LED there's polarity problem.

Before exchange of decoder:

If the direction turned to /\, then #8 will be +0V~+20V, so Lf- LED shine.
If the direction turned to \/, then #1 will be -0V~-20V, so Lr- LED shine.

I think this configurations by means of:

Keep compatibility for DC operating with DC circuit plate and according-to-direction head lights.
Simplify the lighting circuit by only turn on and off the motor output(so the brightness of headlights related to motor voltage).

BUT, this simplification makes problem.

After exchange a decoder to #60955:

If the direction turned to /\, #4 is +U(+20V) and #8 switch to gnd. but polarity is opposite for LED, so Lf- LED does NOT shine.
If the direction turned to \/, #4 is +U(+20V) and #1 switch to gnd. so Lr- LED shine.

This is a 'Head lights problem' occured by changing decoder.

How to fix?

Invert the polarity of Lf LED.

Simply doing this solves the problem.

I didn't test this configuration on DC= rails. I'll test it and report what happen in that situation in near future.

But I think there are many variations in certain models(as always in marklin's products).

Make sure, take a look your model for detail and think well actual diagram, before trying to do this. As a fact, I've burned out four yellow LEDs of E69 when I faced on this problem!

Be care full all the time, you dissect your models.

NOTE:The circuit diagrams fig.1,2 and 3 are simplified drawings. Naturally there are resister etc. in actual circuit.