Hi Neshprint,
The 7700 error can be caused by a faulty cartridge. Unfortuately, the error code does not definately mean that and it does not specify which one may be the cause.
To resolve this issue, it is recommended that both ink cartridges are replaced with new, genuine Canon ink cartridges.
Your PIXMA TS3722 is compatible with the following ink cartridges:
PG-275 black
CL-276 color
PG-275XL black
CL-276XL color
They can be purcahsed directly from Canon:
Ink for your PIXMA TS3722 - usa.canon.com
If the 7700 error perists after changing both ink cartridges, please contact one of Canon's Technical Support Representatives via phone or chat. To contact a Technical Support Representative, please use the link below to log into your My Canon account:
https://mycanon.usa.canon.com
Once logged in, click on your PIXMA TS3722 and then click on the Product Support button to access your available support options.
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