Oki Microline 520 Service Handbook page 178

3.3.02 Printhead Gap Adjustment
General Information
Before performing this adjustment, always verify that the printhead is properly installed. This
adjustment should be performed when the following parts are replaced.
1. Printhead (3.2.02)
2. Space Motor Assembly (3.2.11)
3. Space Rack (3.2.13)
4. Guide Rail (3.2.15)
5. Platen Assembly (3.2.19)
6. Carriage Shaft (3.2.25)
NOTE:
Place a new ribbon cartridge in the printer before testing for parallelism.
If the density of the top portion of the characters differ from that of the bottom portion,
follow steps 10 - 12.
Maintenance 3 - 66 Microline 520/521 Service Handbook
P/N 59257803