Ricoh D093 - Band with no Image-Width 1;3 of Image; Image Writing Problems; No Image (Blank Copy;Print)

Image Problem Troubleshooting
D093/D094 7-8 SM
7.1.3 IMAGE WRITING
1. No Image (blank copy/print)
Possible causes:
 VDB board defective
 SIPU board defective
 LPH (LED head) defective
2. Band with no image-width 1/3 of image
Possible causes:
 Connection problem between VDB and LPH
 LPH head defective