HP 7475a - SECTION III ADJUSTMENTS; 3-7. PEN HEIGHT ADJUSTMENT

Model 7475A
Section III
SECTION Ill
ADJUSTMENTS
3-1. INTRODUCTION
3-2. This section describes mechanical adjustments
required to return the HP 7475A to its nonnal operating
condition after repairs have been made. There are no
electrical adjustments in the HP 7475A.
3-3. EQUIPMENT REQUIRED
3-4. The adjustment procedures require use of the fol-
lowing tools:
Allen wrench (0.050 in.)
100 mm ruler
3-5. MECHANICAL ADJUSTMENTS
3-6. PEN HEIGHT ADJUSTMENT
3-7. Pen height adjustment is necessary if the pen
carriage assembly is disassembled or replaced.
I WARNING I
The following procedure should be per-
onned only by service-trained personnel
who are aware of the electrical shock
hazards involved.
a. Set the HP 7475A LINE switch to OFF (0) and
disconnect the line cord.
b. Remove the HP 7475A top case by removing the
screws indicated in Figure 3-1.
REMOVE THREE
SCREWS
Figure 3-1. Top Case Removal
c. Position pen holder at center of platen.
d. Using the 100 mm ruler, measure the distance
from the platen to bottom of pen holder. It should
be 10.5 mm. See Figure 3-2.
e. To adjust pen height, insert a 0.050 in. Allen
wrench through hole at rear of pen carriage. Turn
clockwise to decrease height and counter-clockwise
to increase pen height. See Figure 3-3.
f. Reverse procedure to replace top case.
PEN
HOLDER
PLATEN
Figure 3-2. Measuring Pen Height
PEN HEIGHT ADJUSTMENT SCREW
7090-A-25· 1
Figure 3-3. Pen Height Adjustment
3-1