TABLE 7-1. 7035B TROUBLESHOOTING INDEX (Continued)
PROBLEM
POSSIBLE CAUSE
CURE
8.
(cont)
c.
Excessive X-axis gear backlash.
c.
Adjust backlash (paragraph 5-83).
9.
X-axis motor stalls when
X drive belt too tight. Measure
Adjust (loosen) drive belt
end of scale stops are
per paragraph 5-78.
(paragraph 5-79).
hit. (Prolonged operation
in this condition may
damage motor or ampli-
fier - motor must not
stall. )
10. Recorder response ex-
Input signal source impedance too
Use lower source impedance.
tremely slow - operating
high (paragraph 5-92).
on 1 mv/inch (0.4 mv/cm)
range.
11. Zero position not repeat-
No source impedance connected to
Place resistance across
able during recorder
input.
input terminals (+ to -).
"set-up" - using 1 mv/
R to be 20K or less.
inch range (0.4 mv/cm).
12. Pen carriage wobbles
Pen carriage wheels too hose.
Adjust pen carriage wheels
causing poor writing.
per paragraph 5-71.
13. Y-axis moves in jerks,
a.
Drive string too loose. Measure
a.
Tighten drive string (see
seems to occasionally
per paragraph 5-66.
paragraph 5-67).
bind or stick.
b.
Pen carriage wheels set too tight.
b.
Adjust pen carriage per
paragraph 5-71.
c.
Insufficient backlash in gears (too
c.
Adjust backlash (paragraph 5-69).
tight).
d.
Motor brushes excessively worn.
d.
Replace brushes (see paragraph 5-38).
e.
Motor brush stuck, held off
e.
Free-up brush (see paragraph 5-40).
commutator.
f.
Bearing in drive system faulty.
f.
Replace bearing.
g.
Excessive mechanical friction.
g.
Clean and lubricate per
Unit needs general cleaning and
paragraphs 5-9, 5-12.
lubrication.
14. X-axis moves in jerks,
a.
X-axis slider rod bearings too
a.
Adjust slider rod bearings
seems to occasionally
tight.
(paragraph 5-85).
bind or stick.
b.
X-gear backlash insufficient (too
b.
Adjust backlash (paragraph 5-83).
tight).
c.
Motor brushes excessively worn.
c.
Replace brushes (paragraph 5-38).
d.
Motor brush stuck and therefore
d.
See paragraph 5-40.
held off commutator.
e.
Bearing in drive train faulty.
e.
Replace bearing (paragraph 5-87).
f.
Excessive friction.
f.
Clean and lubricate per
paragraphs 5-9 and 5-12.
7-4
Summary of Contents for HP-7035B
Page 1: ...TECHNICAL MANUAL HEWLETT PACKARD MODEL HP 7035B ...
Page 9: ...FIGURE 1 4 DIMENSION DRAWING FIGURE 1 5 ACCESSORIES 1 3 ...
Page 12: ...FIGURE 1 7 TYPICAL FREQUENCY RESPONSE INPUT FILTER FIGURE 1 8 TYPICAL DYNAMIC RESPONSE 1 6 ...
Page 14: ...FIGURE 2 1 WING BRACKET INSTALLATION FIGURE 2 2 STACKED CONFIGURATION 2 2 ...
Page 16: ...FIGURE 3 1 FRONT PANEL CONTROLS 7035B AND 7035B 001 MODELS 3 2 ...
Page 20: ...FIGURE 4 1 BLOCK DIAGRAM FIGURE 4 2 DETAILED BLOCK DIAGRAM 4 2 ...
Page 48: ...TM 11 6625 2850 14 P FIGURE 6 1 EXPLODED VIEW CABINET 6 9 ...
Page 49: ...TM 11 6625 2850 14 P FIGURE 6 2 EXPLODED VIEW CARRIAGE ARM SHEET 1 OF 2 6 10 ...
Page 58: ...FIGURE 7 1 COMPONENT IDENTIFICATION FRAME 7 8 ...
Page 59: ...TM 11 6625 2850 14 P Figure 7 2 Component Identification Circuit Board 7 9 ...
Page 60: ...TM 11 6625 2850 14 P Figure 7 3 Schematic Model 7035B D 07035 92550 7 10 ...
Page 62: ...TM 11 6625 2850 14 P FIGURE 8 1 COMPONENT IDENTIFICATION CIRCUIT BOARD 8 2 ...
Page 66: ...TM 11 6625 2850 14 P FIGURE 8 5 EXPLODED VIEW CARRIAGE ARM 8 6 ...
