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Section V
Maintenance
Table
5-2.
Lubricants and Solvents Required
Model 7754A/7414A
5-12. Operational Checks and Inspection
Type
MACHINE OIL,
0.10
GEAR GREASE
CHAIN GREASE
PENETRATI G OIL
SOLVE T AND CLEA ER
Commercial Source
or Hewlett-Packard
Part No.
6040-0220
6040-0222
6040-0223
Commercial, such as
Marvel Mystery Oil
DOW CWorothene
(l,I-Inhibited
TricWoroethane)
5-13. Switch Recorder power OFF. Inspect the Recorder
for evidence of mechanical or electrical overload, dents,
rust, and corrosion. Check that all components are securely
mounted, including the cable connectors. Also check exter-
nal connecting cables for strain, breaks, and frayed insu-
lation.
If
the Recorder is installed in a cart or cabinet, the
cables should be free when the Recorder is moved in and
out.
WARNING
TO PREVENT PERSONAL INJURY IF RECORDER
SHOULD SLIDE PARTLY OUT, KEEP RECORDER
ATTACHED TO CART OR CABINET WITH SCREWS IN
FRONT PANEL AT ALL TIMES EXCEPT DURING
MAINTENANCE.
5-14. Operate the Recorder in all speed ranges, and perform
the operating procedure, using all controls listed in Figure
3-1.
a.
As part of an incoming inspection;
b.
Periodically, where maximum reliability is required;
c.
To troubleshoot malfunctioning circuits; and
d.
After repairs or adjustments.
5-7. To facilitate checking the Driver Amplifiers and the
Regulator/Oscillator Assembly, extender boards (Table 5-1)
are available as accessories.
5-8. Variable Line Voltage.
5-9. During the performance checks, the Recorder should
be connected to the power source through an adjustable
autotransformer so the line voltage can be changed ± 10%
from the nominal 115 or 230 Vac.
CAUTION
TO AVOID DAMAGE, REMOVE POWER FROM THE
RECORDER BEFORE DISCONNECTING ASSEMBLIES
OR COMPONENTS.
5-10. PREVENTIVE MAINTENANCE
5-11. Preventive maintenance is recommended every six
months or 1000 hours of operation and as an aid for minor
repairs, adjustments and troubleshooting.
5-2
5-15. The following steps check operation of the Recorder:
a.
Recorder slides: Check that the slides roll in and out
smootWy and that they lock in the full open position
(Figure 2-1).
b.
Paper tension: Run the Recorder at the highest
speed, and inspect paper travel over the platen at the paper
table (See Figure 4-9). The paper should travel snugly over
the paper table. Adjust the paper brake (paragraph 5-24) if
necessary, or clean or replace the brake felt (Paragraph
5-27).
c.
Paper tracking: The paper brake should be slightly
tighter at one side or the other so the paper will track
consistently to the right and not weave back and forth. Run
approximately 5 feet of the chart at 25 mm/sec. Marker
styli are normally in a fixed position between channels.
Remove the record and measure the distance between the
marker trace and the edge of the chart paper. The measure-
ment should be consistent within
±
0.5 mm all along the
length of the record. Repeat this procedure at the 100
mm/sec speed. If the paper weave exceeds the limit, loosen
the left paper brake adjustment screw slightly (Figure 5-1).
If
adjustment is difficult or if tracking problems persist, see
Paragraph 5-24.
d.
Galvanometer to Paper Parallax: So that all channels
will have the same time reference with respect to the paper,
all stylus tips must fall on the same time reference line of
the paper, ± 0.25 division. To check parallax, apply power
to the Recorder, and set to STANDBY mode. With finger
pressure, gently move the stylus off center full scale, in the
07754-1
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