daver2
10k Member
Correct.
Your eyes are the best diagnostic tool!
An engineering saying is "if it doesn't look right, it isn't right"!
If it looks corroded/damaged fix it first. I am still not sure why it is those two patches that were corroded like they were.
Anyhow, the +12V supply enters the board via the orange wire. It passes through the small inductor just above the connector. C12 is a smoothing capacitor across the +12V supply after the inductor.
This supply then feeds the motor controller IC - the TA7245.
If the PCB damage - or C12 was faulty - this could cause a reduction in the supply voltage to the TA7245 motor controller IC. This could account for your observed fault.
There are reported problems for this type of disk drive indicating that the electrolytic capacitors are prone to failure.
There is another (smaller) capacitor C17 close to the TA7245 that performs a similar function (across +12V and 0V/GND). In light of the evidence, I would be inclined to replace this component also.
Dave
Your eyes are the best diagnostic tool!
An engineering saying is "if it doesn't look right, it isn't right"!
If it looks corroded/damaged fix it first. I am still not sure why it is those two patches that were corroded like they were.
Anyhow, the +12V supply enters the board via the orange wire. It passes through the small inductor just above the connector. C12 is a smoothing capacitor across the +12V supply after the inductor.
This supply then feeds the motor controller IC - the TA7245.
If the PCB damage - or C12 was faulty - this could cause a reduction in the supply voltage to the TA7245 motor controller IC. This could account for your observed fault.
There are reported problems for this type of disk drive indicating that the electrolytic capacitors are prone to failure.
There is another (smaller) capacitor C17 close to the TA7245 that performs a similar function (across +12V and 0V/GND). In light of the evidence, I would be inclined to replace this component also.
Dave
