Olsa Service Hints - IBM Selectric Maintenance Manual

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 Engineers have replaced a Selectric I/O in a
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 "On
Line".
This Section is designed to illustrate the usefu Iness
and diagnostic abilities hidden within the OlSA.
Several of the main items are:
1. Using 0 lSA as an exercizer.
2. Diagnosing mechanical problems.
3. OlSA Servicing Aids for the Selectric
4. Scopi ng procedures for
0
lSA 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 Selectric is pulled off the system, be
sure that it is a Selectric problem.
2. Use every available moment of on-line time to
diagnose the symptoms.
3. Endeavor to duplicate the failure under known
conditions.
4. Obtain print-outs when avai lable, showing the
Selectri c mal-function.
5. Use error indications and CE test panels when
available 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? -- Or, has it failed both on output and input?
7. Listen -- Does print clutch operation sound er-
rati c rather than rhythmi c? Is the machi ne ex-
cessive
y
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 lure 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 OlSA Service Hints
Refer to the 0 lSA Instructi on/Reference Ma'1ua I for
instructions on how to connect your Selectric I/O 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 hana cycle wheel on Selectric I/O.
Assume your printer is intermittently failing 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 OlSA. Every other machine cycle
will 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-
ti ona I cam fo \lower bai
I.
5. Space 'Clutch 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 ability of magnet assembly to trip
cycle clutch with only one print magnet energized.
1 . Function Switch: Print Alternate
Ti It and Rotate Print T3 R%
Print Alternate Tl R+5
On print cycles, R-5 only will 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 will
be energized.
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