HP 7925D Service Manual page 51

7925
Maintenance
TYPE OF CONTAMINATION:
NONE. IDEAL HEAD CONDITION.
CAUSE:
NEW HEAD OR MINIMAL OPERATION
IN A CLEAN ENVIRONMENT.
REMEDY:
NONE.
TYPE OF CONTAMINATION:
OXIDE BUI LDUP ON TRAI LING EDGE (DOWN HEAD SHOWN).
TYPICAL OPERATING CONDITION.
CAUSE:
NEW MEDIA OR MANY HOURS OF OPERATION.
REMEDY:
CLEAN AS OUTLINED IN PARAGRAPH 2-15.
TYPE OF CONTAMINATION:
ABRASION AND PARTICULATE.
CAUSE:
MEDIA IS ABRASIVE OR EXCESSIVE MECHANICAL RUNOUT EXISTS.
REMEDY:
REPLACE DEFECTIVE HEAD AS OUTLINED IN PARAGRAPH 5-18.
A DELAY IS PERMISSIBLE. IF WIDTH OF ABRASION IS LESS THAN
0.13-cm lO.05-in.)
TYPE OF CONTAMINATION:
ABRASION AND PARTICULATE.
CAUSE:
EXCESSIVE OPERATION ON ABRASIVE MEDIA. AIR FLOW
RESTRICTED AND/OR CONTAMINANTS PRESENT IN AIR
CIRCULATION
REMEDY:
REPLACE DEFECTIVE HEAD AS OUTLINED IN PARAGRAPH 5-18.
REPLACE MEDIA. CHECK ABSOLUTE FILTER SEAL AND
MEASURE ABSOLUTE FILTER OUTPUT AIR PRESSURE AS
OUTLINED IN PARAGRAPH 2-13.
REF 7300-12(1) THRU (4)
Figure 2-6. Examples of Head Contamination
2-11