P-Touch PT-330 won't print anything

I have a PT-330 that won't print anything. It sounds just like this problem asked over at Justanswers.


http://www.justanswer.com/printers/2ktvg-older-p-touch-label-maker-pt-330-when-print.html

"Customer Question
I have an older P-Touch label maker (PT-330). When I print, the label comes out but it is blank. I have tried several different size tapes to see if it is a tape problem, but they all are the same. Is it a goner? "

Everything seems to work, it just doesn't print anything on the tape.






I inspected it very carefully and the problem is that the roller isn't being pressed tightly against the printhead. The plastic in the mechanism has gotten brittle and a piece has cracked so it no longer works properly.

If you look carefully at the picture you can see the gap. There isn't supposed to be any gap when the lever is pushed all the way down.





It's interesting to look at the system board. Click on the pic for a full size view.




There's a Mitsubishi M37702S1AFP M37702 cpu in spot #5.



There's a ROM chip, a Samsung KM23C4100CG-12 in spot #4.



There's a RAM chip, an NEC D43257BGU-85LL in spot #2.



There's a Gate Array, an NEC D65612GF053 in spot #3.



There's an LCD driver NJU6450AF from JRC (new japan radio company njr.com) in spot #6.




I haven't figured out where spot #1 is. Perhaps it's the LCD on the other side of the board.


There's a motor to drive the gears and roller that pulls the tape through, a Mabuchi EG-530AD-9B 2400RPM 9V motor CCW.




In the upper left, there's a pad for a connector called XT1 P5. I wonder if that's for some kind of external connector, like a serial port possibly.

Maybe the XT1 is the marking for a crystal oscillator, the one marked 16000NMF?

The F is the Fujitsu logo, and it looks like a piezoelectric resonator, so it must be a Fujitsu resonator.





Judging from all of the 97s I see on the system board, I would estimate it to be built in 1997.


It'd sure be interesting to dump the rom from this board, wish I had an EPROM programmer.


Here's the other side of the system board, with all of the keyboard pads and the LCD.



And the back of the keyboard.