This is my first post and was supposed to be a cry for help, but instead I have the solution.
Pardon if it is in the wrong section.
This working drive gave up the ghost this summer with the following symptoms:
The motor would all of a sudden be more noisy, head load solenoid would behave erratically.
Sometimes the solenoid would engage but would still fail to read disks.
VERY long story short:
After probing and recapping the main logic board I found that the index pin on the output would give sporadic pulses that corresponded with the solenoid engaging and disengaging.
The frequency of the pulses though indicated that the motor was indeed going uncontrolled and way too fast.
The solution:
The two SMD caps (4.7 uF and 22uF /25V) on the motor control board was leaky, but in such small quantities that no smell or discoloration was initially detected.
Desoldering them though gave the odour and measurements thereafter.
A good start for 2021!
Pardon if it is in the wrong section.
This working drive gave up the ghost this summer with the following symptoms:
The motor would all of a sudden be more noisy, head load solenoid would behave erratically.
Sometimes the solenoid would engage but would still fail to read disks.
VERY long story short:
After probing and recapping the main logic board I found that the index pin on the output would give sporadic pulses that corresponded with the solenoid engaging and disengaging.
The frequency of the pulses though indicated that the motor was indeed going uncontrolled and way too fast.
The solution:
The two SMD caps (4.7 uF and 22uF /25V) on the motor control board was leaky, but in such small quantities that no smell or discoloration was initially detected.
Desoldering them though gave the odour and measurements thereafter.
A good start for 2021!
