4VL-E630U/TVL-E680UVL-E685U/T5. MECHANISM ADJUSTMENT5-2. Items and timings of inspection and maintenance5-2-1. Inspection and maintenance listTape travelling route(Refer to Section)Drum (Refer to Section)RemarksRollers• If abnormal rotation ordeflection (signifi-cant) is found, replacethe roller.Other than rollers• Clean the tape con-tacting areas. Be sureto use the specifiedcleaning agent.Possible symptomencountered• Lateral noise• Unclean head• Screen shakingUsage time (hrs.)500 1,000 1,500 2,000 3,000Checking/Maintenance pointTape travel system• Improper S/N ratio• No color appears.Video headTiming beltPinch rollerCapstan D.D. motorRelay Pulle shaftPulle gear shaftDrive gear shaft• Tape does not run.• Tape slackens.• Screen shakes.• Abnormal sound • Apply oil.(Oil: )• Replace if failure isfound.H H H∆ ∆ ∆Driving system∆ ∆ ∆Loading motor • Replace if failure (ab-normal sound) is de-tected.Abnormal soundPB/VS-REW take-up torquePB/VS-REW back tensiontorqueTu brake• Not ejectable• The specific mode can-not be set.• If conformance to thestandard is not en-sured, replace part.H H H H HH H HH H HH H HH H HPerformance checkNote:After oil is applied tothe drive gear shaft,slightly wipe it off withswab.HC (Head Cleaner)Oil:Grease: MORYCOAT YM-103/X5-6020Screw locking agent: THERE BOND 1401BCleaning liquid: Industrial-use ethyl alcohol: Replace.: Clean.∆ : Apply oil.H : Check.5-4. ADJUSTMENT OF MECHANISM TAPE TRAVEL SYSTEM5-4-3. Adjusting the Si roller height(2) Adjusting the Si roller1 Playback the tape such to set the V/SR mode.