Power Module Wiring - HP 7475A Service Manual

Model 7475A
918
FUSE TO
SWITCH
Section VI
98 54
NEUTRAL GROUND
TO SWITCH
908
LINE TO
FUSE
TWO 8 - SWITCH TO TRANSFORMER (LINE)
TWO 928 - SWITCH TO TRANSFORMER (NEUTRAL)
WIRE IDENTIFICATION IS BY COLOR CODE:
54 =GREEN/YELLOW
7470-A-21-1
8 =GRAY
98 =WHITE/GRAY
908 =WHITE/BLACK/GRAY
918
=
WHITE/BROWN/GRAY
928 =WHITE/RED/GRAY
Figure 6-21. Power Module Wiring
6-84. Thorough cleaning should be performed periodi-
cally. Cleaning intervals are determined by the type of
operation, local air contamination, and climatic condi-
tions. Cleaning procedures should include the following:
a. Blow away the dust accumulation with compressed
air, if available. Dust may also be removed with
a lint-free cloth.
b. Clean the outer surface of the plotter with a
damp sponge or cloth. Use a mild soap and water
solution if necessary. Wipe dry after cleaning.
NOTE
To prevent sratching, do not use abra-
sive cleaners on the plastic cover. The
cover should be cleaned with a mild
solution of soap and water and wiped
dry with a lint-free cloth.
6-85.
PEN STALL CLEANING
6-86. Before using overhead transparency pens, remove
leftover ink from the capping hole in the pen stalls
of the carousel using a cotton swab. This will prevent
the transfer of other inks to the plots.
6-87. DIAGRAMS
6-88. Figure 6-22 explains symbols which may appear
on the schematic diagrams, and Figure 6-23 illustrates
logic symbols used. Figures 6-24 through 6-26 are sche-
matic diagrams of the 7475A circuits.
6-17