IBM Selectric - Olsa; Olsa SERVICE HINTS

OlSA
24.0 OlSA
There are times, because of customer requi rements,
or other considerations, when on-line service time
must be held to a minimum.
Therefore, the need wi II arise for 0 lSA. Many Cust-
omer Engi neers have rep laced a Se lectri c I/O ina
system with a spare machine and have then been faced
with a situation whereby the I/O wi II apparently per-
form satisfactori lyon 0 lSA but wi II not operate liOn
Line II •
This Section is designed to illustrate the usefulness
and diagnostic abilities hidden within the 0 lSA.
Several of the main items are:
1. Using 0 lSA as an exercizer.
2. Diagnosing mechanical problems.
3. 0 lSA Servicing Aids for the Se:lectric •
4. Scoping procedures for OlSA and the I/O.
In order to use OlSA effectively, obtain as much in-
formati on about the fai lure as possib Ie.
1. Befor~ the Selectrk is pulled off the system, be
sure that it is a Selectric prob lem.
2. Use every available moment of on-line time to
diagnose the symptoms.
3. Endeavor to duplicate the fai lure under known
conditions.
4. Obtain print-outs when avai lable, showing the
Selectric mal-function.
5. Use error indications and CE test panels when
avai lable to help you determine what area in the
Selectric might be causing the trouble.
6. Ask, especially on keyboard machines -- Does it
fail only on output? -- Does it fail only on in-
put? -- 0 r, has it fai led both on output and input?
7. Listen -- Does print clutch operation sound er-
ratic rather than rhythmic? Is the machine ex-
cessively noisy in one area or during anyone op-
eration? Does machine seem to be slower in per-
forming anyone operation than others?
If you know:
1. Under what conditions the fai IlUre occurred.
2. What general areas might have caused the fail-
ure: .
3. What symptoms the fai lure caused.
Then you shou Id be ab Ie to use 0 lSA to:
1. Duplicate the conditions that brought on the
fai lure.
2. Pinpoint the fai ling mechanism or component.
3. Know when the malfunction has been eliminated.
OlSA SERVICE HINTS
25.0 0 lSA Service Hints
Refer
to the 0 lSA Instruction/Reference Manual for
instructions on how
to connect your Selectric'VO to
OlSA.
25.1 HAND CYCLING
Turn ET motor swi tch off.
Set desired operation on function switch.
Set desired character on ti It rotate switch.
Push Start.
Use hand cycle wheel on Selectric I/O.
Assume your printer is intermittently fai ling to space.
Print escapement is okay, so the trouble is in the op-
erational area. Set function switch to print/space
and push start on 0 lSA. Every other machi ne cyc Ie
wi II be a space cycle.
Hand cycle the Selectric and observe:
1. Space magnet armature pick.
2. Space interposer unlatching clearance and move-
ment to rear.
3. Cycle release arm trips.
4. Space operational latch is pu~hed under opera-
tional cam follower bail.
S. Space'c lutch pawls drop into ratchet and cam
turns.
6. Escapement torque bar pu lis escapement paw Is
from rack.
7. Carrier moves one space.
8. Escapement trigger re-Iatches on escapement
torque bar lever.
Any interruption in this sequence of events wi II cause
a fai lure to space.
25.2 S.H. ONE ARMATURE TEST
Purpose: Check abi lity of magnet assemb Iy to trip
cycle clutch with only one print magnet energized.
1. Function Switch: Print Alternate
Ti It and Rotate Print T3 R,0'
Print Alternate T 1 R+S
On print cycles, R-5 only wi II be energized. On
print alternate cycles, T-2 only will be energized.
2. Function Switch: Print
Ti It and Rotate T3 R+3
Each machine cycle only the R2A armature wi II
be energized.
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