ip4500 problems again, electrical?

[l_c]

I had the same sort of problem.
I believe that my power supply is good, and that my logic board is good.
And I am (tentatively) glad for that.
I don't know whether my issue is with the print head, or is a mechanical issue (friction?), or could be a regulation (power supply) fault.
Am hoping that it's just the print head making the system fail; but I'm having a hard time understanding that.

I posted my issue on the Canon forum site, here ...
http://community.usa.canon.com/t5/Personal-Printers/iP4500-powering-itself-off/td-p/138577

Any ideas? Thanks; Larry

 

[l_c]

I solved my iP4500 problem.
I purchased a new print head; QY6-0075 (direct replacement for the original QY6-0067 in my printer).
Cost to me was about 100 USD including postal mail (arrived in a couple of days).
The printer worked fine afterward.
So I gather that there was excess current drawn by my QY6-0067, and that created a power fault which prevents the printer from operating in full/normal power state (i.e. it shuts itself on, or remains in standby).
(If I knew the power rail pads on the print head, then I might have tested that myself, i.e. apply a small test voltage and measure current.)
Larry