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Which problem?

This is the control board. Look at the block below it. Connectors often cause similar problems.

No. You should have about 310V and 2.6A I wrote above: Watch the current on the center console. Menu "Machine" . If it doesn't show, switch the language to German. Field supply is made with 2 diodes and 2 thyristors. If one thyristor is not working..... then 170V and 1.6A (It can by checked...

There is no way an English translation would be more powerful on a German machine.

Some models when the machine is stopped, yes

Replace the potentiometer (if defective), the motor, (if defective) and adjust as I have shown above. There is no other way.

Not exactly. Current and voltage must be measured while the machine is running.

Parameter disk main drive. (HA parameter)... From the set of diskettes of the machine. Use the Parafin program. If you don't have Paraffin, here it is.

What does the nameplate of the motor say?

Ee.

Older machines have the option of running tacho or rotor (armature) voltage. The connection diagram can be found on the last page of the electric documentation of the machine. It is done with a small screwdriver. 3 bridges must change places. I'll take a picture of it for you tomorrow.

It is good to learn first, then write.

Try working without a tacho.

Tacho.

The second HD is defective. Program not find partition D:\ there is a job list. A fresh installation on new disk or on the old disk with a new partition. Min. 4 partitions...... Or use a service disc & emergency mode.

DOS 6.2

What is the difference?

Bad adjustment also sprays

A new BIOS setting is required. For old machines: control, alt, escape, to enter BIOS setting. If the disks are original from the production of the machine, I attach a photo of the setting.

Low price = low quality