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Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.5 LUBRICATION
3.5.01 General Information
If the lubrication procedures are not performed properly, the printer will require more frequent cleaning.
Excessive lubricant attracts dust and accumulations build up quickly. An accumulation of paper dust is the
most frequent cause of print quality problems in a dot matrix printer.
3.5.02 Lubrication Schedule
Routine inspection and lubrication should be performed as listed below.
· Every six months
or
· 300 hours of operation
or
· When a part on the lubrication schedule is replaced
3.5.03 Lubrication Types
· Grease (Dow Corning BR2 or equivalent)
· Machine Oil (10 - 30 weight)
3.5.04 Lubrication Amounts
Do NOT over-lubricate the printer. Operational problems are caused by excess lubricant. The excess
lubricant causes dust to accumulate. These accumulations can jam gears or cause print problems.
The Lubrication Chart will direct you to use the following amounts of lubricant.
· Medium
Oil: three to four drops
Grease: thin coating (approximately 0.15 inch)
· Small
Oil: one drop
Grease: extremely thin coating (approximately 0.008 inch)
3.5.05 Lubrication Table
Lubrication
Point
Disassembly
Procedure
Lubricant Amoun
t
Notes
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