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Cbm dual drive 3040 disk - two red lights

I can only see the main drive motor in post #720 - not the stepper motor. The drive motor has the red and blue wires. The stepper motor has 6 wires going to it. Can you post a further picture please.

The resistance figure in post #721 looks fine to me now - well done. All I can assume previously is a measuring mistake when you got 0 Ohms.

Dave
 
Excellent, that's the beast..

You can see quite clearly two (2) bundles of wires:

1. RED, ORANGE and YELLOW.
2. RED, BLACK and BROWN.

The first bundle (RED, ORANGE and YELLOW) contains phases B and D.

The second bundle (RED, BLACK and BROWN) contains phases A and C.

The two (2) red wires (one from each bundle) should go to the black drive connector pins 11 and 12.

The RED wire from the RED, ORANGE and BROWN bundle should go to pin 11 of the black drive connector.

The RED wire from the RED, BLACK and BROWN bundle should go to pin 12 of the black drive connector.

With the black drive connector disconnected from the analogue logic board, can you measure the resistance between the two (2) RED wires that you follow back from the two bundles of wire from the stepper motor to the black drive connector please.

Dave
 
daver2 said:
Excellent, that's the beast..

You can see quite clearly two (2) bundles of wires:

1. RED, ORANGE and YELLOW.
2. RED, BLACK and BROWN.

The first bundle (RED, ORANGE and YELLOW) contains phases B and D.

The second bundle (RED, BLACK and BROWN) contains phases A and C.

The two (2) red wires (one from each bundle) should go to the black drive connector pins 11 and 12.

The RED wire from the RED, ORANGE and BROWN bundle should go to pin 11 of the black drive connector.

The RED wire from the RED, BLACK and BROWN bundle should go to pin 12 of the black drive connector.

With the black drive connector disconnected from the analogue logic board, can you measure the resistance between the two (2) RED wires that you follow back from the two bundles of wire from the stepper motor to the black drive connector please.

Dave
Click to expand...
pin 12 and 12..... 0.L M Ohm for both drives
 
>>> pin 12 and 12..... 0.L M Ohm for both drives

I assume you mean pin 11 and pin 12?

So, I assume that reading is open circuit? (which it should be)

Dave
 
daver2 said:
>>> pin 12 and 12..... 0.L M Ohm for both drives

I assume you mean pin 11 and pin 12?

So, I assume that reading is open circuit? (which it should be)

Dave
Click to expand...
yes sorry 11 to 12!
Yes open circuit
 
So, if my memory serves me correctly, everything now looks good - so all the desperation was possibly down to an inconsistent measurement technique somehow?

However, I would now like you to double-check the readings again described in posts #696 and #697 to make sure we have everything as we expect before we move on.

If everything is well, I am fairly convinced we have a good main drive motor and stepper motor on each drive.

Next we will see if we can identify why the drive motor doesn't work on the one drive.

After that, we will move on to the analogue board.

I am working this afternoon, so my posts may be a bit random...

Dave
 
DRIVE 1
Pin 12 (RED) and pin M (BROWN) - Phase C.= 36
Pin 12 (RED) and pin P (BLACK) - Phase A.= 35.5
Pin 11 (RED) and pin N (ORANGE) - Phase D.= 36.3
Pin 11 (REd0 and pin R (YELLOW) - Phase B.= 36,7

DRIVE 0
Pin 12 (RED) and pin M (BROWN) - Phase C.= 36
Pin 12 (RED) and pin P (BLACK) - Phase A.= 35.7
Pin 11 (RED) and pin N (ORANGE) - Phase D.= 36.1
Pin 11 (REd0 and pin R (YELLOW) - Phase B.= 36,1
 
So, these readings indicate to me that either I was not very good at explaining things or we had some measurement inconsistencies somewhere. Either way, we have resolved the issue by going all the way back to first principles and proceeding very methodically and slowly.

I am sorry that my second language is not Italian. During the lockdown my son was learning Dutch. Now he is also learning Norwegian!

This looks to me like both stepper motors are fine.

Reassemble the disks to the analogue board.

The next thig to do is to identify resistors R1 and R4 on the analogue board - and can you tell me what the values are - or detail the band colours. According to the schematic they should be 1k - but according to your photograph in post #659 that may not be the case.

Dave
 
daver2 said:
Mi dispiace che la mia seconda lingua non sia l'italiano. Durante il lockdown mio figlio stava imparando l'olandese. Ora sta imparando anche il norvegese!
Click to expand...
Oh! Tuo figlio è un ragazzo fantastico!
 
Thank you for the Italian lesson. Yes, he is a smart boy.

We have made great progress today. Do you want to carry on for a bit or wait now until tomorrow afternoon?

Dave
 
I am assuming we will be carrying on tomorrow afternoon.

The next test involves 'forcing' the motor speed controllers to turn ON.

We can also start to have a look at the signals that are driving the stepper motor for the head positioning.

Dave
 
Actually, in the meantime, if you would like to take some measurements for me to look at on the analogue board I will require the following:

Using your logic probe - the HIGH/LOW/PULSE status of pins 1, 5, 9 and 13 on UC1 (74LS04).

Using a multimeter (set to read 12V DC full scale) measure the voltage on both leads of the following diodes - with the black lead of your multimeter always connected to 0V/GND (i.e. only measure the specified voltages with the red lead of your multimeter):

CR1 through CR16 (16 diodes and 32 voltage readings).

Dave
 
daver2 said:
Using your logic probe - the HIGH/LOW/PULSE status of pins 1, 5, 9 and 13 on UC1 (74LS04).
Click to expand...
High signal for each pin....i take 5v for supplying logic probe...correct?
daver2 said:
CR1 through CR16 (16 diodes and 32 voltage readings).
Click to expand...
CR1: 0,6 - 0,6 V
CR2: 0,6 - 0,6 V
CR3: 1 - 11,4 V
CR4: 11,4 - 11,4 V
CR5: 1V - 198 mV
CR6: 0,6V - 193 mV
CR7: 11 - 11 V
CR8: 0,6 - 11 V
CR9: 0,6 - 0,6 V
CR10: 0,6 - 0,6 V
CR11: 1 - 11 V
CR12: 11 - 11 V
CR13: 1 - 0,2 V
CR14: 0,6 - 0,2 V
CR15: 11 - 10,8 V
CR16: 0,6 - 11 V
 
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