IBM 1620 Manual page 12

tough tissue behind the original.
PILING
Insufficient carriage tension.
Improper universal bar adjustment.
Dirt in segment.
Dirt on power roll.
Escapement tripping too late or too early.
Dirt in carriage ways and rails.
Worn typebar.
Broken or worn universal bar.
It is possible for an operator to pile the type by
uneven rhythm or by striking two or more keys
nearly simu I taneously.
Strict adherence to adjustment procedures will
minimize this occurrence.
PAPER WRINKLING
Swollen platen and feed rolls.
Uneven feed roll pressure.
Bent deflectors.
Check all paper feed pointers.
Partial feed roll contact.
CARRIAGE RETURN
FAILS TO OPERATE
Faulty cam link adjustment
Bind in cam.
Back space pawl may be binding the interlock which
wi II cause carriage return fai lure.
INCOMPLETE RETURN
Fau I ty cam adjustment.
Escapement pawl pulled too far out of the rack.
lip of the clutch knockout lever adjusted too high.
Clutch lever bracket adjusted too loosely.
Nut on compression spring under machine should
be tightened.
Lack of tension of the latch spring.
Improper cam link adjustment.
Improper latch adjustment.
CARRIAGE LOCKS
Latch I ink adjustment allows too deep a latch en-
gagement.
Excessive latch spring tension.
Weak motor.
Bind in power roll and drive mechanism.
Tip of clutch knockout lever too low.
Clutch knockout lever I ink adjusted so knockout
lever is too low.
Margin rack adjustment allows too much overbank.
Clutch lever bracket adjusted too tightly.
Adjusting nut on compression spring adjusted too
3.6
tightly.
Clutch operating arm too close.
Carriage return tape off pulley.
Truck roller or star wheel binds.
Upper I ine
I~ck
Bellcrank spring.
UNEVEN MARGIN
Margin rack out of adjustment.
Broken tab lever assembly or margin stop.
Excapement pawl sticking or binding.
Weak pawl spring.
Air cylinder port closed too much.
Carriage return contacts maladjusted or bounc ing.
Too strong carriage return - especially on long
carriage machines.
MOTOR
FAILS TO START OR RUN
Faulty condenser. Check by turning motor by hand.
Fau I
ty
motor.
Broken switch.
Switch I ink improperly adjusted.
Frozen bearing.
Bel ts too tight.
NOISE
TOP COVER VIBRATBS
Open cover and spread sides sl ightly.
REAR COVER VIBRATES
Reposition rear cover.
CARRIAGE END COVERS VIBRATE
Reform spring clips.
PAPER TABLE VIBRATES
Reset positioning coll<llrs.
NOISY PAPER BAIL
Check for broken paper bai I spring.
Reposition bail rolls on shaft.
NOISY DRIVE
Check motor and pu lIey lubrication.
Align pulleys.
Replace worn belts.
Adjust belts.
Check power roll adjustment.
NOISY TYPING
Typebar hitting front scale.
Type rest pad worn.
Platen too hard.