MP-3350 faint copies great prints

[aAandy]

hello everyone

this machine prints well (except the dots, new drum going in) but copies come out rather faint - cleaned exposure lamp, reflector, mirrors, lens and CCD to no effect

this is evidently a scanner issue, i will be returning to try some changes in SP4429, 4450, 4460, 4572 & 4585, but i was wondering if anyone has seen this before and can point me in the right direction

attached first page is a print, 2nd a copy

thanks in advance

Andy

[slimslob]

I do not see any mention of cleaning slit glass or platen glass.

[davel]

Check again that the mirrors are clean.

[sandmanmac]

this is evidently a scanner issue, i will be returning to try some changes in SP4429, 4450, 4460, 4572 & 4585, but i was wondering if anyone has seen this before and can point me in the right direction

Replacing Drum? Just the drum? NO.
Replace/Rebuild the PCDU.

Widely known issue (have a look through the site) that these PCU's often behave in this manner when they approach/ exceed the PM.
"Yes", I know it doesn't make sense since the copies are good.
Service and calibrate the PCU PROPERLY and the issue will be resolved

[Oze]

Replacing Drum? Just the drum? NO.
Replace/Rebuild the PCDU.

Widely known issue (have a look through the site) that these PCU's often behave in this manner when they approach/ exceed the PM.
"Yes", I know it doesn't make sense since the copies are good.
Service and calibrate the PCU PROPERLY and the issue will be resolved

Fit a new PCDU.
This series is notorious for this symptom and a new PCDU is the resolution.

[aAandy]

I do not see any mention of cleaning slit glass or platen glass.

opsies - naturally i cleaned both before cleaning the lamp, reflector, mirrors, lens and CCD

[aAandy]

Check again that the mirrors are clean.

i don't need to check, when i clean something, it is spotless else i do it again til it is

[aAandy]

Replacing Drum? Just the drum? NO.
Replace/Rebuild the PCDU.

Widely known issue (have a look through the site) that these PCU's often behave in this manner when they approach/ exceed the PM.
"Yes", I know it doesn't make sense since the copies are good.
Service and calibrate the PCU PROPERLY and the issue will be resolved

yes, i've read all the threads, and i've seen this issue before where a new PCDU did not correct the issue (machine replaced) - the PCDU in this machine is relatively new and the fault occurred 'overnight'

not to mention i've been doing this for more than 30 years, so i posted because this was outside of normal

[aAandy]

thank you everyone for your responses, it is very much appreciated - i will be revisiting this machine Monday and i have a new PCDU so i can eliminate that possibility

sadly, a new lens assembly (CCD assembly) costs the client around $900.00 here - so i will fiddle every possible SP mode adjustment before going there

will post the solution in due course

[BLADE]

I reckon the 'good print' is poor and needs fixing before looking at the poor copy