MP530-fried the logic board with a bad head?

nerdful1

Getting Fingers Dirty
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I have to emphasize this (seems to be a special disease of canon printers..)

Some say this could be avoided by a protective circuit...if the manufacturer was willing to avoid it...

Years ago, I tried to order this for my lab as a capital equipment request, but never (shot down) ordered.
I had plans at home for similar gadget for consumer electronics and was surprised to see Tektronix come out with one.

You could put a signature analyser and scope on each logic board contact of importance, and compare it to a known good board.

From old Tektronics ad:
Analog Signature Analysis
Since the TR210 is used while the power to the circuit-under-test is turned off, you avoid an accidental short that could cause further damage. It allows you to analyze the overall health of a solid-state component, which makes it perfect for finding leakage or substrate damage that has brought a circuit board or a complete system down prematurely. Because it can compare suspect components to known good equivalents, it's also ideal for troubleshooting when documentation is missing or incomplete. The TR210 works by applying a current-limited AC signal across two points of a component. The current flow causes a vertical deflection of the TDS200 oscilloscope display, while the voltage causes a horizontal deflection. Together, they give you a unique current-voltage "analog signature" that represents the overall health of the device-under-test. By analyzing each signature, you can quickly tell if a component is good, bad, or marginal.
 
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