Igeneral Information; Introduction; Specifications; Safety Considerations - HP 7475A Service Manual

Model 7475A
Section I
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION
1-2. This service manual contains information nec-
essary to test and service the Hewlett-Packard Model
7475A Plotter. This manual is divided into six sections
as follows:
I GENERAL INFORMATION
II OPERATING AND PERFORMANCE TESTS
III ADJUSTMENTS
IV REPLACEABLE PARTS
V PRODUCT HISTORY
VI SERVICE
1-3. Information for interfacing, operating, and pro-
gramming the Model 7475A is contained in the following
publications:
HP
Title Part Number
Interfacing and Programming Manual 07475-90001
Operation and Interconnection Manual 07475-90002
Programmer's Reference Card 07475-90004
1-4. This General Information section includes a de-
scription of the plotter, its specifications, options avail-
able, accessories supplied, and general installation
instructions.
1-5. SPECIFICATIONS
1-6. Table 1-1 lists the specifications for the Model
7475A. These specifications include the performance
standards against which the plotter is tested.
1-7. Also included in Table 1-1 are supplemental
characteristics. Supplemental characteristics are not
specifications but are typical characteristics included as
additional information for the user.
1-8. SAFETY CONSIDERATIONS
1-9. Safety information relevant to the service proce-
dure being described is provided in the appropriate sec-
tions of this manual. The Model 7475A and this manual
should be reviewed for safety markings and instructions
before service work is begun.
Table 1-1. Specifications
PERFORMANCE SPECIFICATIONS
Repeatability
With the same pen: 0.1 mm (0.004 in.)
With a different pen: 0.2 mm (0.008 in.)
SUPPLEMENTAL CHARACTERISTICS
Maximum plotting area
B/A3: 402.2 mm (15.8 in.)
X
274.8 mm (10.8 in.) metric
414.2 mm (16.3 in.)
X
258.0 mm (10.2 in.) English
A/A4: 274.8 mm (10.8 in.)
X
192.2 mm (7.6 in.) metric
258.0 mm (10.2 in.)
X
198.2 mm (7.8 in.) English
Pen velocity
Pen down: maximum, 38.1 cm/s (15 in.ls)
programmable, 1 to 38
emfs
in 1 cm/s
increments.
Pen up: 50.8 cm/s (20 in.ls)
Addressable step size
0.025 mm (0.00098 in.)
Acceleration
Approximately 2g
Power requirements
Source: 100, 120, 220, or 240 Vac -10%, +5%
Frequency: 48 to 66 Hz
Consumption: 35 W maximum
Size
Length: 57 cm (22.5 in.)
Width: 37 cm (14.5 in.)
Height: 13 cm (5 in.)
Weight
7.2 kg (15.8 lb)
1-10. PLOTTERS COVERED BY MANUAL
1-11. The plotter serial number is located on the rear
panel. Hewlett-Packard uses a two-part serial number
consisting of a four-digit prefix and a five-digit suffix
separated by a letter (OOOOAOOOOO). The prefix is the
same for all identical plotters and changes only when a
modification is made that affects parts compatibility.
The suffix is assigned sequentially and is different for
1-1