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The error code ##334 represents a EEPROM
check error. The manual says this means the Printed Circuit Board may
need replacing, however, try this procedure. Insert paper into
machine. 1)To enter service mode press Menu, copy, # 2) Select Test Mode
with the + or - keys 3) Press OK 4) Press 8, lcd shows 'Please Wait',
after wait, press 3, the lcd then alternates between 3-0 (EEPROM clear), and 3-1 (Purge flag) 5) When EEPROM clear (3-0) shows in lcd,
press 0, then OK, then Stop then press the OFF button.
Repeat the above from Step1 to step3 in step 4 this time reset the Purge flag by pressing 0 when 3-1 shows in the lcd, OK, Stop, Off. If
the red fault light is still blinking press Resume.
#334 is an eprom error and if turning on and off does not reset it, you have something going on with the main logic board. http://printer1.blogspot.com/2009/01/canon-multipass-mp730-service-manual.html
Above is a service and repair manual this will assist you to troubleshoot and hopefully repair, although I fear with this type of fault, it needs to be returned to the factory.
My printer will print on every type of paper i set it to in the preferences, except "plain paper". the machine also doesn't copy when set to plain paper also. I printed a report cover on matte paper which printed fine, but when i change back to plain paper, it doesn't print.
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