Epson FX-870 Service Manual page 107

Adjustments, Maintenance, and Lubrication
9. Rotate the adjusting bushing until the platen gap is large enough for a 0.36 mm thickness
gauge, but too narrow for a 0.40 mm thickness gauge.
10. Move the carriage until the edge of the printhead is at the 75th column print position for
an 80-column printer or at the 130th column print position for a 136-column printer.
11. Use the 7 mm box driver to rotate the parallelism adjustment bushing on the right frame
of the printer mechanism.
12. Rotate the adjustment bushing until the platen gap is large enough for a 0.36 mm
thickness gauge but too narrow for a 0.40 mm thickness gauge.
13. Move the printhead back to the 5th column print position again. Check the platen gap
with the thickness gauge. It should still be large enough for the 0.36 mm thickness gauge
but too narrow for the 0.40 mm gauge. If this is not the case, go back to step 8.
14. Remove the printhead, install the ribbon mask, replace the printhead, and install the
printer mechanism back in the case.
5-2
Figure 5-2. Parallelism Acijustment Bushing
Figure 5-3. Platen Gap
Epson FX-870/1170