Widget drive 1:This drive turns on and spins, there is an audible clunk about 5 seconds after reaching speed (this drive sounds lovely, smooth and no strange noises)
The lights on the widget controller board light up and the voice coil actuator arm attempts to read the disk and initiate the self test. Although this fails and the head just jitters backwards and forwards (it doesn't make the very unique squeaking noise)
The controller board waits for the motor to reach its speed, then issues a servo reset pulse. /ServoReset releases the HDA brake solenoid, this is the clunk you hear. After that, a single seek is done. You should hear "squeak-squeak". If you get "squeak-bang" or somthing like this instead, your servo is broken or badly misaligned. After that the controller performs a R/W test on an outer track. If this passes, the bad block scan is started ("squeak-tic-tic-tic-..." with blinking LED).
Your drive seems to fail after the first seek and it should end up with the ready LED on. In this condition the drive will not accept regular R/W commands, but you can use diagnostic tools like WidEx (Apple III), NeoWidex (Lisa) or UsbWidEx (PC-based) to read the status registers of the controller. This should give you more information about the fault type.
To check and align the servo system, refer to the last chapter on this page:
http://john.ccac.rwth-aachen.de:8000/patrick/UsbWidExamples.htm. Without special tools you can rotate the HDA axle manually. Keep the drive upright and do not move the HDA arm while motor is not spinning!
Widget drive 2:This drive turns on and spins up however there is no audible clunk and the brake doesn't release. None of the drive lights illuminate other than when powered on briefly
So you do not get the /ServoReset signal. Either your controller board is faulty and does not do anything at all, or the motor does not come up to speed (or the controller thinks so), or there is a /ServoReset pulse and your solenoid is badly misaligned and cannot move.
* Check the solenoid alignment. There should be a small air gap between the rubber pad and the HDA axle when the solenoid is engaged. Push its latch back manually to check this. It is possible that it sticks in the beginning and comes loose if you push it back a few times. The solenoid is attached with a central screw, so you can even remove and realign it if necessary.
However, do not move the HDA arm (i.e rotate the axle) while the spindle motor is not running! The rotating disk causes significant airflow inside the drive, and this is necessary to lift the heads from the magnetic surfaces. Without airflow the heads will scratch the magnetic coating.
* Swap the controller boards between both drives. It is safe to do so, this does not affect alignment or formatting.
* Monitor the ServoReset line with an oscilloscope during startup. If the pulse is there, check the motor PCB on the bottom of the drive and the solenoid. You can even issue a ServoReset by yourself by shorting U1D (74LS09) pin 3 to Gnd.