Search results

I would go after the 2 small can transistors on the motherboard should be 2n3116 or 2n3700. They are used to bias the main drive transistors that are on the bottom of the heat sink.

Bearing are still available and parts a like transistors are still available. If you have a warranty from the previous repair on the unit I would send it back in for a evaluation. If not I would be willing to take a look at it if you wanted. I work for Bevan Aviation in Wichita KS, as the...

The 2 small can transistors on the top right of your pic and the 4 transistors on the bottom of the unit are the most common parts to fail. If you know how to check transistors that is where I would start or possibly send the unit back for evaluation. Sounds like the servo is ok, just need to...

Based on the picture of the multi-meter I would say that it looks like you had 10ohms of resistance. Brush wear looks to be ok on the commutator no bad threading or grooving that I can see. How was the back bearing, was it stiff or packed with carbon? Also, what resistors are you referencing...

Yes you could use a 12VDC supply and bias the motor directly to see if it would run, I would suggest to have a current meter so you can see what the current pull is. Even if the motor was faulty and was pulling more current than normal it might run but due to the current pull it would cause the...

Yes, the roll servo connector pins C and D with meter on resistance. Ideally yes, the motor should drive with that type of voltage reading. However, if one of the brushes is not properly seated or the windings are open/shorted the motor will not work.

Yes the 1C338 and 1C385 are the main amplifier/control head. With the AI only having a couple of deg roll error it should have been controllable with the roll turn knob or heading error if the heading rocker was closed. You could check the resistance of the drive motor, a 14v motor should be...

So, with red lead on CD47 C or E at the amp and black lead on CD47 D or D at the amp with the roll knob full right I had 12.2VDC and full left was -12.2VDC. Test was ran on the 66D1000 Century bench test set with a Century 2 amplifier (1C338). My guess would be that there is a fault in the...

Brushes and bearings are still available. If there is excessive wear on the commutator the drive motor assembly would have to go back to Globe for overhaul. Currently there is a part issue with some motor assemblies that I currently have at Globe and we are waiting on parts to finish the...

Correct, if you see the voltage at the servo connector CD 47 and you can control it with the roll turn knob or heading mode the wiring from the amplifier to the servo is good and the amplifier is functioning properly. The problem would then be in the roll servo, possibly a issue with the carbon...

On the CD47 roll servo connector there are 4 pins A(solenoid power), B(ground), C(motor), and D(motor/common). If you feel the solenoid engage pins A and B are good, the ones in question are C and D. You can take a multi meter and check the drive voltage (DC) from the amplifier by using pins C...

Adjusting the Left/Right bank limit pots will not remove a roll oscillation issue. It will adjust the maximum bank limit the system is able to produce. Depending on the unit Century 2 VS Century 3 there is a way to adjust the feedback in the roll circuit called Roll THD. On the Century 3 it...

If the installing shop did not do the gyro alignment procedure after the install this must be done. If the gains for the gyro are too far out of spec they can produce oscillations in flight. The alignment procedure is outlined in the GI275 IM. Things like bridle tension for the pitch servo...

As Jesse mentioned they should have got a interface box from Deklin instead of building the transformer isolation circuit.