Full m/lab SD2000 schematics

[Mechanic]

HI GS,

You must have a big voltage offset coming out of the tlc27 into the tlc074. With no target signal it should be 0v with maybe an offset of +-10mV max. Have you used the same opamp or a substitute? Connect the input side of the 2.2uf caps to ground and measure the voltage offset at each stage up to the threshold control.

It is hard work manually copying the pcb from the schematic. I used to do that but made some very dumb mistakes when I made the pcb. I now only make the schematic first then convert the schematic to pcb in Diptrace, then mostly manually route the nets and verify the pcb to the schematic. Works much better this way.

Cheers Mick

[g.s]

Good evening MEC ..
of embodiments check around the than mine pcb For point ( RX ) ..The result is that all the links are RIGHT ok ..
1 ) the chips that I have used are all the same with original from ZED ,Simple is package DIP..
2 ) I have replace the transistor BC850 with BC 550 located near the LM394..
3 ) at NE5534 I have used two capacitors in parallel 39 pf and 1 pf ceramic because I could not find is on that market 40 pf..
3 ) for two pot at ground balance I have used 50 k 10 turm..
4 ) at TLC27M7 to B point the output of this there are two diodes ( bas16 ) I have to replace 1n4148 ..
5) in all the chips Power is -5v and +5v,at schematic at tlc27m7 at the end near the gate NAND why you are writing in point b (( #NOTE )), aaaa one more thing to close matter the link the Pilie NAND we mean the a 1 pin to 2 pin the REVERSE MATTERS, for Pilie NAND use the HEF4011 BP..

mechanic Did my signal is low from coil because he managed to do it with resistance 0.7 R ...

THANK YOU much that suffering..

[serci78]

What is IRF10 transmission and insulation timing? mechanic help please regards

[Mechanic]

Hi Serci,

Check the power supply page, middle right hand side "goes to transmit cct B" its the 2.5v reference.

Hi GS,

Did you check the voltage offset yet?

The outputs at the testpoints should be no more than a couple of mV. Check that the voltage going to the threshold cct is the same.

I don't think the resistance of your coil will be effecting the threshold in this way.

Cheers Mick

[g.s]

HI MEC...
I made my measurements indicated..
Take a look and you..about the outcome..



SWITCH ( volts/div ) on the oscilloscope is my 0.1

[Mechanic]

HI GS,

It needs to be done at 5 or 10mV. 0.1 is too high to tell.

Cheers Mick

[porkluvr]

g.s. you must be the proud owner of an oscilloscope and also a F****** moron.
Your scope shots convey almost ZERO information.

ZERO (0)

[g.s]

Good evening mec ..

CORRECT me is here...



Now I have the oscilloscope to 10 mv..
sorry we all make mistake by speed..

[Mechanic]

HI GS,

Ok well assuming the middle line on your scope is gnd, the offset there looks fine, it would be less than 5mv which should be easily adjusted by the threshold control.
Set the channel control switch to ch1(or2) and then look at the signal coming out of pin 14 on the 4053. It should be the same as the signal going in on pin 12 or 13.
Make sure the gnd connection at the tlc074 at the threshold pot has the same potential as the gnd connection at the tlc27m7cd, perhaps use a wire to connect the grounds together.
Check that the output of the tlc27m7 pin 7 is the same voltage as pin 14 4053.

See how you go with that!

Cheers Mick

[g.s]

HI MEC ..

COMPLETION MEASUREMENT I I indicated . Here is my..



point GND It is certain OK ,I did the test with the cable and I have the same result is OK...

then ???

EEE MEC the VOLTAGE catering is my +4,85v and -4,95v may be a problem from this ?? , for this MAYBE had to hate so much resistance from the THRESHOLD .??...amount should be line voltage A little over +5v and -5v ???

[Mechanic]

Hi GS,

Your +-5v supplys are fine. The voltage is never an exact 5v. Don't know Perhaps there is a mistake in the schematic You scope shots look correct. If its working, its working.

Cheers Mick

[g.s]

yes do that..
my head to see asterisks amounts has produced..

I WILL DO control and remainder SCHEMATIC line line today.

[kadir6141]

hi friends why is 1.leg emty lm336

[g.s]

best explained kadir .. you are not understandable ..

[Mechanic]

hi friends why is 1.leg emty lm336

Because it is not used! It is a 2.5v zenar diode.

Cheers Mick