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A preventive maintenance schedule for the Model 50
is shown on Figure 51. The asterisked items indi-
cate the frequency that should be used for the first
six months of system operation. Because component
failures are more frequent during the first six months
of operation, frequent preventive maintenance will
minimize unscheduled maintenance during that period.
Preventive maintenance should be performed at a
critical time, such as the first thing Monday morning
or immediately after power has been down for an
extended period.
Lamp Test
Use the lamp test switch on the maintenance panel to
test and replace all defective lamps. Marginal voltage,
frame thermal, open CB, and power check lamps are
PREVENTIVE MAINTENANCE
not tested
by
the test switch, but should be checked by
substitution or by duplicating the situatio'l that would
cause the lamp to indicate. The lamps are pluggable
and can be replaced from the front of the pannel. Use
CE tool #461420 for removing lamp assemblies.
Diagnostics
Run all diagnostics (CPU and channel multiprograms
using all multiplexor and selector channels avail-
able in order to get a maximum configuration in
overlapped operation).
For biasing, vary the marginal check voltages
per the marginal check specifications before running
the diagnostics. Test for both upper and lower
marginal check limits while running the diagnostics.
Figure 50 is a listing of Model 50 diagnostics.
.------ lnsta II
at ion
l
fl
Frequency (Weeks)
Unit
Item
CPU
Lamp Test (Page 79)
Run Diagnostics and FLT's (Page 74)
Bias Diagnostics and FL T's (Page 74)
CPU and Channel
Run CPU and Channel Control Multiprogram
Bias CPU and Channel Control Multiprogram
Channel
Run Diagnostics (Page 74)
Bias Progressive Scan (Page 74)
Main Storage
Run Diagnostics (Page 74)
(Includes Bump
Bias Diagnostics** (Page 84)
and Storage Protect)
Local Storage
Run Diagnostics (Page 74)
Bias Diagnostics** (Page 76)
Check Array Te1T1perature (Page 92)
ROS- Retry
Check Timing (Page 95)
Power System
Make Visual Checks
Miscellaneous
Check Filters/Screens
Check Fans/Blowers
Check Usage Met er
*Denotes frequency during first six months of operation.
(A diagnostic listing is shown on Figure 50.)
1
1
2
4
x
.
x
x
.
x
x
.
x
x
.
x
.
x
.
x
.
x
.
x
.
x
x
x
x
x
x
x
**Biasing in these cases means checking operation
at
the four corners of the shmoo plot limits;
that is, the earners of the rectangle in local storage and the corners of the rectangle in main
storage whose sides are
at
least 4.5% (of the operating point voltages) away from the operating
point.
FIGURE 51.
MODEL 50 PREVENTIVE MAINTENANCE SCHEDULE
8
13
x
x
x
.
x
x
x
x
x
x
x
26
52
x
x
x
x
x
Preventive Maintenance
(3/71)
79
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