HP 7475a User manual

-------------(h!J ~:~KL.f~6--------------.
SERVICE MANUAL
HP 7475A
GRAPHICS PLOTTER
SERIAL NUMBERS
This manual applies directly to plotters
with serial numbers prefixed 2541 V.
For additional important information about
serial numbers, see PLOTTERS COVERED
BY MANUAL in Section I.
©1983, 1987 by HEWLETT-PACKARD1COMPANY
16399 W. BERNARDO DRIVE, SAN DIEGO, CA~IFORNIA 92127-1899
MANUAL PART NO. 07475-90000 Printed:
AUGUST 1987

Model 7475A Table ofContents
TABLE OF CONTENTS
Section
I GENERAL INFORMATION . . . . . . . . . . . . . 1-1
1-1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-6. Specifications . . . . . . . . . . . . . . . . . . . . . 1-1
1-8. Safety ConsidE!rations . . . . . . . . . . . . . 1-1
1-10. Plotters Covered by Manual . . . . . . . . 1-1
1-15. Description . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-19. Line Voltage and Fuse Selection.... 1-2
1-23. Grounding Requirements . . . . . . . . . . 1-3
1-25. Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-29. Accessories Supplied . . . . . . . . . . . . . . . 1-6
1-31. Recommended Test Equipment . . . . . 1-6
1-33. Packaging for Shipment . . . . . . . . . . . 1-6
II OPERATING AND PERFORMANCE
TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-3. Rear Panel Switches
(Option 001) . . . . . . . . . . . . . . . . . . . . . 2-1
2-9. Rear Panel Switches
(Option 002) . . . . . . . . . . . . . . . . . . . . . 2-1
2-13. Basic Operating Test . . . . . . . . . . . . . . 2-1
2-15. Hewlett-Packard Graphics
Language . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-17. Demonstration Plot . . . . . . . . . . . . . . . . 2-2
2-19. Test Program . . . . . . . . . . . . . . . . . . . . . . 2-2
2-21. Repeatability . .... . . . . . . . . . . . . . . .. . 2-2
III ADJUSTMENTS......................... 3-1
3-1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 3-1
IV REPLACEABLE PARTS . . . .. . . . . . . . .. . . . 4-1
4-1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-3. Exchange Assemblies . . . . . . . . . . . . . . 4-1
4-5. Replaceable Parts Lists . . . . . . . . . . . . 4-1
4-7. Ordering Information . . . . . . . . . . . . . . 4-1
4-9. Code List of Manufacturers . . . . . . . . 4-1
4-11. Designations and Abbreviations . . . 4-1
V PRODUCT HISTORY .. . . . . . . . . . .. . . .... . 5-1
5-1. Introduction . ~..................... 5-1
5-3. History of Assemblies by
Serial Prefix Number . . . . . . . . . . . . 5-1
5- 7. History of Printed Circuit
Assemblies . . . . . . . . . . . . . . . . . . . . . . 5-1
Section
VI SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-3. SimplifiedTheory of Operation . . . . . 6-1
6-7. RS-232-C/CCITT V.24 Interface
Circuit (Option 001) . . . . .. . . .. . . .. 6-1
6-14. HP-IB Interface (Option 002) . . . . . . . 6-2
6-25. Microprocessor Circuit . . . . . . . . . . . . . 6-5
6-29. Read Only Memory Circuit . . . . . . . . . 6-5
6-31. Random Access Memory Circuit . . . . 6-5
6-33. Gate Arrays A and B . . . . .. . .. . . . . . 6-5
6-35. Pen Carousel . . . .. . .. . . .. . . .. . . . .. . 6-5
6-37. Motor Servo Systems . . . . . . . . . . . . . . 6-5
6-41. Motor Supply Sensor Circuit . . . . . . . 6-6
6-44. Motor Current Sensor Circuit . . . . . . . 6- 7
6-46. Pen Down Circuit . . . . . . . . . . . . . . . . . . 6- 7
6-48. Power Supplies .. . . . . . . . . . . .. . . . . . . 6-7
6-50. Recommended Test Equipment . . . . . 6- 7
6-52. Troubleshooting . . . . . . . . . . . . . . . . . . . 6- 7
6-54. Exchange Printed Circuit
Assembly . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6-56. Drive Motors and Pen Solenoid .... . 6- 7
6-58. Troubleshooting Table . . . . . . . . . . . . . 6-8
6-60. Test A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6-62. Test B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6-64. Part Removal and Replacement . . . . 6-9
6-65. Top Case Removal . . . . . . . . . . . . . . . . . 6-9
6-66. Pen Carousel Housing Removal . . . . 6-9
6-67. Paper Drive Motor Assembly
Removal ......................... 6-10
6-68. Pen Solenoid . . . . . . . . . . . . . . . . . . . . . . 6-11
6-69. Pen Drive Motor and Belt . . . . . . . . . . 6-11
6-72. Pen Carriage, Penholder, and
Damper Removal . . . . . . . . . . . . . . . . 6-13
6- 75. Pinch Rollers Removal and
Replacement . . . . . . . . . . . . . . . . . . . . . 6-14
6-76. Printed CircuitAssembly
Removal . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
6-77. Pinch Roller Mechanism Removal . . 6-15
6-79. Paper Drive Shaft and Coupler
Removal . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
6-80. Power Module and Transformer . . . . 6-16
6-81. Power Module Wiring . . . . ........ . . 6-16
6-83. Cleaning . . .. . . . . . . . . . . . . .... . . . . . . 6-16
6-85. Pen Stall Cleaning . . . . . . . .. . . . . . . . . 6-17
6-87. Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
TABLES
Table
1-1. Specifications ........................ .
1-2. Line Voltage Selection ................ .
1-3. Line Fuses ............................ .
1-4. Accessories Supplied .................. .
1-5. Recommended Test Equipment ........ .
2-1. Baud Rate Selection .................. .
2-2. 7475A HP-GL Instruction Set ......... .
1-1
1-3
1-3
1-6
1-6
2-1
2-3
Table
4-1. Parts List, Main PCA, RS-232-C,
Option 001 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-2. Parts List, Main PCA, HP-IB
Option 002 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4-3. Parts List, Mechanical Parts . . . . . . . . . . . 4-8
4-4. Parts List, Pen Carousel Parts . . . . . . . . . 4-10
4-5. Code List of Manufacturers . . . . . . . . . . . . 4-11
i

Table ofContents Model 7475A
TABLES (Continued)
Table Page
Table
Page
4-6. Reference Designations and
5-3. Date Codes ............................
5-1
Abbreviations o 0 0 0 0 I 0 0 0 0 o o o oo o o o o o o o o 4-12
6-1.
RS-232-C/CCITT V.24 Interface Signal
5-1. Assemblies by Plotter Serial Number Levels ···················............
6-2
Prefix ................................ 5-1
6-2. Recommended Test Equipment .........
6-7
5-2. Item Description ....................... 5-1 6-3. Troubleshooting ··············.........
6-8
ILLUSTRATIONS
1-1. Model 7475A . . .. .. . . .. . .. . .. . .. .. . .. . . . 1-0
1-2. Top Case Removal . .. . . . ... . .. . .. . . .. . . 1-3
1-3. Line Voltage Selection . . .. .. . . .. . .. . . .. 1-4
1-4. Power Cord Configurations . .. .. . . .. . .. 1-5
2-1. Pl and P2 Button and Power Switch
Locations . . .. .. .. . . .. . . .. . .. .. . . . .. .. 2-3
2-2. Demonstration Plot . . .. .. . .. . .. . . .. . .. . 2-5
2-3. Test Program . . . .. .. . . .. . .. . .. . .. .. . .. . 2-6
2-4. Features Test Plot . . .. .. . . .. . . .. . .. . . .. 2-9
2-5. Repeatability Test Points . .. .. . . .. . .. . . 2-10
4-1. Model 7475A Exploded View . . .. .. . .. . . 4-9
4-2. Pen Carousel Parts . . .. .. . . .. . . .. . .. . .. 4-10
6-1. 7475A Simplified Block Diagram . . .. .. . 6-1
6-2. RS-232-C/CCITT V.24 Interface
Circuits . . .. .. .. . . .. . .. . . .. .. .. . . .. . . 6-3
6.-3. HP-IB Interface Circuits and Handshake
Timing Diagram . . .. .. . . .. . .. . .. . .. .. 6-4
6-4. Quadrature Waveforms . . ... . .. . .. . . .. . 6-6
6-5. Motor Servo System Block
Diagram . . . . . ... . . .. . .. . .. . . ... . . . 6-6
6-6. Drive Signal · .ses . . .. .. . .. . . .. . .. . . .. 6-9
6-7. Top Case Ret._Jval . . .. .. . . .. . . .. . .. . . .. 6-9
6-8. Pen Carousel Cable . . ... . . .. . .. . .. . .. . . 6-9
11
6-9. Pen Carousel Housing . . . ... . . . .. . . .. . . 6-10
6-10. Paper Drive Motor and Solenoid
Cables . . .. .. . .. .. . . .. . . .. .. . . .. . . . .. . 6-10
6-11. Paper Drive Motor Clamp and Pen Drop
Shield . . . ... . .. . .. . . .. . . .. .. . . . .. . . .. 6-10
6-12. Paper Drive Coupler Parts . . .. .. . . . .. . . 6-11
6-13. Pen Solenoid and Pen Drive . . . . .. .. . . .. 6-12
6-14. Pen Drive Tensioner . . . .. .. . . .. . . .. . . .. 6-12
6-15. Pen Carriage . . . .. .. . . .. . . .. . .. . . . .. .. . 6-12
6-16. Measuring Pen Down Force . . . .. .. . . .. . 6-14
6-17. Pinch Rollers . .. . .. . .. . . .. . . .. . . .. .. . . . 6-14
6-18. Chassis Assembly Removal . . . . .. .. . . .. 6-14
6-19. Underside ofChassis Assembly . . . . .. . . 6-15
6-20. Power Module Removal . . .. .. . . .. . . . .. . 6-16
6-21. Power Module Wiring . . . .. .. . .. . . .. . . . . 6-17
6-22. Schematic Diagram Notes . . .. .. . . .. . . . 6-18
6-23. ANSI Y32.14 Logic Symbols . . .. .. . . . .. 6-20
6-24. RS-232-C, Option 001 Schematic
Diagram . . ... . .. . . .. . . .. . . .. .. . . .. . . 6-27
6-25. HP-IB, Option 002 Schematic
Diagram . . ... . .. . . .. . . .. . . .. .. . . . .. . 6-29
6-26. Power Supply, Schematic
Diagram ..................... , . . .. . . 6-31

Model 7475A Safety Symbols
General Definitions of Safety Symbols Used On Equipment
7 OR@
rh OR J.
WARNING I
1-A-26-1
International caution symbol (refer to manual): the product will be
marked with this symbol when it is necessary for the user to refer to
the instruction manual in order to protect against damage to the
instrument.
Indicates dangerous voltage (terminals fed from the interior by
voltage exceeding 1000 volts must be so marked).
Protective conductor terminal. For protection against electrical
shock in case of a fault. Used with field wiring terminals to indi-
cate the terminal which must be connected to ground before
operating equipment.
Low-noise or noiseless, clean ground (earth) terminal. Used for a
signal common, as well as providing protection against electrical
shock in case of a fault. A terminal marked with this symbol must
be connected to ground in the manner described in the installation
(operating) manual, and before operating the equipment.
Frame or chassis terminal. A connection to the frame (chassis) of
the equipment which normally includes all exposed metal struc-
tures.
Alternating current
Direct current
Alternating or direct current
The WARNING sign denotes a hazard. It calls attention to a pro-
cedure, practice, or the like, which, if not correctly performed or
adhered to, could result in personal injury.
The CAUTION sign denotes a hazard. It calls attention to an op-
erating procedure, practice, or the like, which if not correctly
performed or adhered to, could result in damage to or destruction
of part or all of the product.
iii

Section I Model 7475A
7475-A-1-1
Figure 1-1. Model 7475A
1-0

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 OPERATINGAND 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 isbegun.
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 Wmaximum
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

Section I
each plotter. This manual applies directly to plotters
with the serial prefix shown on the title page.
1-12. If the serial number prefix ofyour plotter is higher
than the one shown, one or more update packages of
revised pages are supplied with the manual. Use these
new pages to replace the original pages. If two or more
update packages are supplied, insert them in order by
revision letter; that is, Revision A first, then Revision B,
etc. The title page will then show the latest serial prefix
and the manual will apply directly to plotters with that
prefix.
1-13. In addition to plotterchanges, revised pages may
correct errors in the manual or include improved proce-
dures.
1-14. If the plotter at hand has a lower serial prefix
than the one shown on the title page, information in the
Product History section will adapt this manual to that
plotter.
1-15. DESCRIPTION
1-16. The Model 7475A accepts digital information to
produce graphic plots on ISO A3, 297 X 420 mm (11 X 17
in.) paper or ISO A4, 210 X 297 mm (8-1/2 X 11 in.) paper
orspecial transparency plastic. Disposable pens are avail-
able in various ink colors.
1-17. The six-pen capability permits several colors to
be used in a plot without stopping the plotter to change
pens manually. Pens are automatically capped while
they are stored in the pen carousel.
1-18. Seven different line types are provided. Labeling
can be done in nineteen character sets plus user-defined
characters. Text(labeling) can bewritten in any direction,
upright, or slanted. Character size is also variable. In
addition, arc and circle generation as well as area fill
with various fill types are provided.
1-19. LINE VOLTAGE AND FUSE SELECTION
To prevent damage to the plotter, make
sure the line voltage and fuse selection
is correct before connectinglinepower.
I WARN•• I
The line power cord and power outlet
must have a protective earth (ground)
terminal.
1-20. The 7475A primary powercircuit can beconfigured
to operate from any one of the following power sources
at a line frequency of 48 to 66 Hz, single phase. Maxi-
mum powerused is 35 W.
1-2
100 Vac-10%,+5%
120 Vac -10%,+5%
220 Vac -10%,+5%
240 Vac -10%,+5%
Model 7475A
1-21. Line voltage selection, and the required fuse
ratings for each line voltagesetting, are specified on the
line voltage label which is visible through the small
recessed window in the rear panel. See Figure 1-2.
Applying a linevoltage of 220 V or240 V
to the plotter while the linevoltage selec-
tion is set for 100 V or 120 V operation
may damage the plotter circuits.
1-22. The line voltage selection may be changed to con-
form to the line voltage in a particular area. Use the fol-
lowing procedure. I
WARNING I
The following procedure should be per-
formed only by service-trained person-
nel who are aware of the electrical shock
hazards involved.
a. Set the plotter LINE switch to OFF (O) and dis-
connect the linecord.
b. Remove the plotter top case by removing the
screws indicated in Figure 1-2. Lift the rear of the
top case and the front will then release. When
replacing the top case, make sure the PAPER
HOLD lever extends through the case, and that
the tabs inside the front of the top case align
properly above and below the base plate.
c. Line voltage selection is determined by the power
inputconnectionsto the transformer primary wind-
ings. Table 1-2 lists the wire colors and trans-
former contact connections for each line voltage.
The transformer pin numbers are identified on
the power module molding. Figure 1-3 illustrates
the connectionsfor each voltage. Change the wire
connections as required to conform to the desired
line voltage selection.
d. Make sure the line fuse is correct according to
Table 1-3. The fuseholder cap is the bayonet type.
Press and turn counterclockwise to remove, clock-
wise to lock.
e. Change the position of the line voltage label
block so that the voltage selected is right side up.
This block snaps in and out of the power module
molding.
f. Replace the top case, making sure it fits properly
on the front edge of the base and the PAPER
HOLD lever extends through the case.
g. Install the proper power cord for the power range
selected and type of mains outlet to which the
cord is to be connected. See Figure 1-4.

Model 7475A
7475-A-2-1
LINE VOLTAGE AND
FUSE RATING LABEL
REMOVE
THREE
SCREWS
Figure 1-2. Top Case Removal
LINE
FUSE
1-23. GROUNDING REQUIREMENTS
1-24. To protect operating personnel, the plotter must
be properly grounded. The plotter is supplied with a
three-conductor power cable which, when connected to
an appropriate power outlet, grounds the plotter. To
preserve this protection feature, do not operate the plot-
terfrom a power outlet which has no grounded connection.
Section I
1-25. OPTIONS
1-26. The Model 7475A is available with one of two
types ofinterface, designated as the following options:
Option 001
Option 002
RS-232-C/CCITI' V.24
Hewlett-Packard Interface Bus
1-27. Option 016 provides a special "eavesdrop" cable
for Option 001.
1-28. The line voltage selection ordered is designated
as one ofthe following:
OptionOIO
Option012
Option 022
Option024
lOOVac
120Vac
220Vac
240Vac
1-29. ACCESSORIES SUPPLIED
1-30. The items listed in Table 1-4 are supplied with
each plotter.
1-31. RECOMMENDED TEST EQUIPMENT
1-32. Equipmentrequired to maintain the Model 7475A
is listed in Table 1-5.
Table 1-2. LineVoltage Selection
NOMINAL
LINE
VOLTAGE
PINI
IOOV
8
120V
8
220V
8
240V
8
*Wire identification is by color code:
8=GRAY
928 =WHITE/RED/GRAY
958= WHITE/GREEN/GRAY
LINE
VOLTAGE
100/120 v
*220/240V (0.25 X 1.25 in.)
(5X 20 mm)
TRANSFORMERPRIMARY CONNECTIONS*
PIN2 PIN3 PIN4 PIN5
PIN6 PIN7
928
958 8 958 NC 928
NC
928 8
928
958 958
958 NC 958
928 8 928
NC 958 958 928 8 928
Table 1-3. Line Fuses
FUSE
FUSE FUSEHOLDER CAP
RATING
HP PART NUMBER HP PART NUMBER
0.6AT 2110-0016
2110-0565
0.3AT
2110-0044 2110-0565
0.315AT
2110-0639
2110-0567
*Either Part No. 2110-0044 or 2110-0449 will provide adequate protection. Part No. 2110-0044 is a standard U.S. fuse for
240 V line; Part No. 2110-0449 is a standard European fuse for 220 V line.
1-3

Section I
1-4
8 928
LINE VOLTAGE
LABEL BLOCK
958 8
928
DETAIL A - 100V
LINE VOLTAGE
LABEL BLOCK
8
928
DETAIL C - 220V
8
928
8
LINE VOLTAGE
LABEL BLOCK
928
958
DETAIL B - 120V
8 958
LINE VOLTAGE
LABEL BLOCK
928
8 928
DETAIL D - 240V
WIRE IDENTIFICATION IS BY COLOR CODE:
8 =GRAY
928 =WHITE/RED/GRAY
958 =WHITE/GREEN/GRAY
CAUTION
MAKE SURE CORRECT FUSE IS
INSTALLED. REFER TO TABLE 1-3.
Figure 1-3. Line Voltage Selection
Model 7475A

Model 7475A
BS 1363A
N
c:::::i
E
D
AS C112
CEE 7-Vll
NEMA 5-15P
NEMA 6-15P
SEV 1011
DHCK-107
HP Part Number 8120-1351; 250 V, 13 A, 1 q, plug
rating. For use in United Kingdom, Cyprus, Nigeria,
Zimbabwe, Singapore.
HP Part Number 8120-1369; 250 V, 10 A, 1 q, plug
rating. For use in Australia, New Zealand.
HP Part Number 8120-1689; 250 V, 10/16 A, 1 q, plug
rating. For use in East and West Europe, Saudi
Arabia, Egypt, South Africa, India.
HP Part Number 8120-1378; 125 V, 15 A, 1 q, plug
rating. For use in Canada, Japan, Mexico,Philippines,
Taiwan, UL approved in United States.
HP Part Number 8120-0698; 250 V, 15 A, 1 q, plug
rating. For use in Canada, UL approved in United
States.
HP Part Number 8120-2104; 250 V, 10 A, 1 q, plug
rating. For use in Switzerland.
HP Part Number 8120-2956; _250 V, 10 A, 1 q, plug
rating. For use in Denmark.
NOTE: All plugs are viewed from connector end.
L =Line or Active Conductor(also called "live" or "hot")
N =Neutral or Identified Conductor
E =Earth or Safety Ground
Figure 1-4. Power Cord Configurations
Section I
Option No_
900
901
902
903
904
906
912
1-5

Section I
1-33. PACKAGING FOR SHIPMENT
1-34. If the plotter is being returned to Hewlett-Packard
for service, attach a tag indicating the type of service
required, model number, full serial number, and your
return address. Also include this information in any
correspondence.
1-35. If the original packaging material has been re-
tained, pack the plotter in the same manner as it was
received. The following general instructions should be
used for packing with commercially available materials.
Model 7475A
a. Wrap the plotter in heavy paper or plastic.
b. Use a strongshipping container.
c. Use a layer of shock-absorbing material at least
70 to 100 mm (3 to 4 in.) thick around all sides of
the plotter to provide firm cushioning and prevent
movement inside thecontainer.
d. Seal containersecurely. Mark container FRAGILE
to ensure careful handling.
Table 1-4. Accessories Supplied
DESCRIPTION
QTY
HP PART NUMBER
Interfacing and Programming Manual 1
07475-90001
Operation and Interconnection Manual 1
07475-90002
Programmer's Reference Card 1
07475-90004
*Plotter paper, pad, 8-112 X 11 in. or 1 17800P
210 X 297 mm (A4), 50-sheets 17802P
*Plotter paper, pad, 11 X 17 in. or 1 17804P
297 X 420 mm (A3), 50-sheets 17806P
Package of5 fiber-tip pens, 0.3 mm nib width, 1 17847P
1 each blue, green, black, aqua, violet
Package of5 black fiber-tip pens, 0.7 mm nib width 1 17826P
Package of5 fiber-tip pens, 0.3 mm nib width, 1 17849P
1 each brown, yellow, orange, red, red-violet.
Pen Carousel 1 5061-5080
*Power Cord 1 See Figure
1-4
*Paper size and power cord supplied is based on the destination ofthe plotter.
Table 1-5. Recommended Test Equipment
TYPE RECOMMENDED MODEL
Computer/controller HP
85 Personal Computer with the
appropriateinterface:
HP 82937A HP-IB Parallel Interface
HP 82939A RS-232-C Interface and
HP 8120-3258 RS-232-C Interface cable
Rom Drawer HP82936A
l/ORom
HP 00085-15003
Digital Multimeter HP3465A
Oscilloscope
HP 1740A
Optical Comparator
B&L 81-34-35
1-6

Model 7475A Section II
SECTION II
OPERATING AND PERFORMANCE TEST
2-1. INTRODUCTION
2-2. The following information is provided to determine
whether the plotter is operating properly. If operation is
not correct, refer to Section VI of this manual for service
information.
2-3. REAR PANEL SWITCHES (Option 001)
2-4. A3/ A4. This switch chooses between Bl A3 size
paper and A/ A4 size paper. The switch is used to set the
default paper size only at power up. Subsequent paper
size changes can be made from the front panel.
2-5. BAUD RATE. Table 2-1 shows the switch settings
required. Disregard any markings on the switch itself
and use the 1 and 0 markings on the rear panel to
determine baud rate.
2-6. PARITY. Two rear panel switches are used for
parity selection. When the SI/PARITY switch is set to 1
(ON), the S2/PARITY switch selects odd or even parity.
2-7. MET/US. This switch is used to program the
plotting area for four paper sizes:
Paper Switch
Maximum
Size Position .
Plotting Area
B/A3
MET
275 x 402 mm
us
10.2 x 16.3 in.
A/A4
MET
192 x 275 mm
us
7.5 x 10.2 in.
2-8. D/Y. When the EAVESDROP switch is in the Y
position, received data is retransmitted and the plotter
does not respond unless it is given a "Plotter On"
instruction. When this switch is in the D position, the
plotter responds to all recognized commands.
2-9. REAR PANEL SWITCHES (Option 002)
2-10. ADDRESS. The plotter's HP-IB address is set by
five of the seven switches on the rear panel. Disregard
any markings on the switch itself and use the 1 and 0
labels on the rear panel to determine the address in
binary coded decimal.
2-11. A3/ A4. This switch chooses between Bl A3 size
paper and A/ A4 size paper. The switch is used to set the
default paper size only at power up. Subsequent paper
size changes can be made from the front panel.
2-12. MET /US. This switch is used to program the
plotting area for four paper sizes:
Paper
Switch Maximum
Size Position
Plotting Area
BIA3
MET
275 x 402 mm
us
10.2 X 16.3 in.
A/A4
MET
192 X 275 mm
us 7.5 x 10.2
2-13. BASIC OPERATING TEST
2'14. The front panel controls can be used to test basic
operation of the plotter; however, this procedure does not
test the 110 circuits.
a. Make sure six pens are installed in pen carousel.
Table 2-1. Baud Rate Selection
ONE STOP BIT
TWO STOP BITS
REAR PANEL SWITCHES
BAUD
REAR PANEL SWITCHES
B4 B3 B2 Bl
RATE
B4 B3 B2
Bl
-- - -
External 0 0 0 0
-- - - 75
0 0 0 1
----110 0 0 1 0
0 0 1 1 150 --- -
0 1 0 0 200 ----
0 1 0 1 300 1 0 1 1
0 1 1 0 600 1 1 0 0
0 1 1 1 1200 1 1 0 1
1 0 0 0 2400 1 1 1 0
1 0 0 1 4800 1 1 1 1
1 0 1 0 9600 --- -
1 =Switch Open; 0 =Switch Closed
2-1

Section II
Before applying power to the plotter,
check the line voltage selection (visible
through the small window in the rear
panel) and make sure the selected line
voltage and fuse value are correct. If
not, refer to Line Voltage and Fuse
Selection in Section I.
b. Apply power to the plotter.
c. With the PAPER LOAD lever in the LOAD posi-
tion, place a sheet of paper (ISO A4/ 8-112 X 11
in. or ISO Aa/ 11 X 17 in.) against the left-hand
rail and the rear guide. Lower the lever to the
PAPER HOW position and be sure that the
plotter is set for the proper paper size.
d. Select a pen by pressing one of the six pen push-
buttons and then operate each of the front-panel
controls. Vertical, horizontal, and diagonal lines
(using the directional controls with a pen down)
should be smooth.
NOTE
If the pen is down, it will lift when
either Pl or P2 is pressed. The VIEW
pushbutton is a latching control. After
VIEW ispressed once, the other controls
will not operate until VIEW is pressed
a second time. The ERROR lightshould
be on when in the VIEW mode. The
ERROR light should be on when the
PAPERlever is in the LOAD position.
If Pl or P2 is pressed while the lever
is in LOAD, the ERROR light should
flash. This error may be cleared by
moving the lever to HOLD and back
to LOAD, or by pressing ENTER and
VIEW at the same time, in which case
the plotter initializes again. While the
plotter is ON, and the PAPER lever is
in the HOLD position, the ERROR
lightflashes very briefly approximately
every five seconds when the motor
power supply voltage is sensed.
2-15. HEWLETT-PACKARD GRAPHICS
LANGUAGE
2-16. The Model 7475A recognizes the Hewlett-Packard
Graphic Language (HP-GL) instructions listed in Table
2-2.
2-2
Model 7475A
2-17. DEMONSTRATION PLOT
2-18. The Model 7475A contains a demonstration plot
stored in Read Only Memory (ROM). The running of
this plot will verify proper operation ofmost ofthe logic
circuits as well as the operation of the paper and pen
drive mechanisms; however, it does not test the 1/0
circuitry. To run the demonstration plot proceed as follows:
a. Make sure six pens are installed in carousel.
b. With the PAPER LOAD lever in the LOAD posi-
tion, place a sheet ofpaper (A4/ 8-1/2 X 11 in. only)
against the left hand rail and the rear guide.
Lower the lever to thepaper HOW position.
c. While holding down buttons Pl and P2, apply
power to the plotter. See Figure 2-1. Release buttons
afterinitialization starts.
d. The resultant plot is illustrated in Figure 2-2.
2-19. TEST PROGRAM
2-20. The program in Figure 2-3 is written in BASIC
language specifically for the HP Model 85 Personal
Computer, but may be adapted to other controllers. This
program tests the input/output circuits of the 7475A and
the majority ofthe logic circuits, as well as the operation
of the paper and pen drive mechanisms. The resultant
plot is illustrated in Figure 2-4.
NOTE
Lines beginning with an exclamation
point are only explanatory and not part
ofthe plot program. Those lines may be
omitted when enteringthe program.
The addresses shown in lines 130, and
140 are only examples, and may vary
with the system or computer used.
2-21. REPEATABILITY
2-22. To verify repeatability specification (Table 1-1)
load six new pens in the carousel and run the test
program previously described. Using an optical com-
parator, verify that the repeatability points on the test
plot are within 0.1 mm using the same pen, and within
0.2 mm using a different pen. See Figure 2-5.

Model 7475A Section
II
POWER SWITCH
7475-A-36-1
Figure 2-1. Pl and P2 Button and Power Switch Locations
Table 2-2. 7475A HP-GL Instruction Set
INSTRUCTION
DEFINITION
VECTOR GROUP
PA x,y(,x,y(,-))
Plot absolute (integer format, -32 768 to +32 767)
PR x,y(,x,y(,-))
Plot relative (integer format, -32 768 to +32767)
PU
Pen up
PD
Pen down
CHARACTER GROUP
CAn
Designate alternate character set (n =integer from 0 to 4, 6 to 9, or 30 to 39)
CP spaces, lines
Character plot (decimal format, -128to+127.9999)
CSn
Designate standard set (n =integer, 0 to 4, 6 to 9, or 30 to 39
DI run, rise Absolute direction (decimal
format -128to+127.9999)
DR run, rise Relative direction (decimal
format-128 to +127.9999)
LB c .... c Label
ASCII string (c =ASCII characters)
SA
Select alternate character set
SI wide, high
Absolute character size (decimal format in centimetres)
SL tan angle(+ or-)
Absolute character slant from vertical (decimal format, tangent of angle from
vertical)
SR wide, high
Relative character size (decimal format, percentage of P2x - Plx and P2y - Ply)
SS
Select standard character set
UC User-defined
character
DIGITIZE GROUP
DC Digitize
clear
DP
Digitize point
oc
Output current position and pen status
OD
Output digitized point and pen status
AXES GROUP
TL tp(,tn) Tick
length (tp =positive length, tn =negative length)
XT X-axis tick
YT Y-axis tick
SETUP GROUP
IP plx,ply(,p2x,p2y)
Input Pl (and P2) (integer format -32 768 to +32 767)
IW xlo,ylo,xhi,yhi
Input window (integer format -32 768 to +32 767)
OP
Output Pl and P2
2-3

Section II
Model 7475A
Table 2-2. 7475A HP-GL Instruction Set (Continued)
INSTRUCTION DEFINITION
CONFIGURATION AND
STATUS GROUP
DF
Set default values
IM e(,s(,p)) Input e, s, and p masks
IN
initialize
OE
Output error
OS
Output status
SC xl,x2,yl,y2
Scale (integer format -32 768 to +32 767)
DTc
Define label terminator (c =ASCII character)
OA
Output actual position and pen status
00
Output options
OF
Output factors
OI
Output identification
ow
Output window
ARC AND CIRCLE GROUP
AA x center, y center arc
Draw arc starting with current position
angle(,chord angle)
AR x center, y center arc
Draw arc with center relative to current position
angle(,chord angle)
CI radius(,chord angle)
Draw circle around current position
AREA FILL GROUP
FT type (spacing (angle)) Fill type
RAx,y
Shade rectangle, absolute
RRx,y
Shade rectangle, relative
WG radius, start angle,
Shade wedge
stop angle (,chord angle)
EAx,y
Edge rectangle, absolut.e
ERx,y
Edge rectangle, relative
EW radius, start angle,
Edge wedge
stop angle (,chord angle)
PT thickness
pen thickness
MISCELLANEOUS GROUP
ROn
Rotate axes in degrees (n = 0,90)
2-4

GRAPHICS IMPROVES COMMUNICATION
SALES
REVENUE DISTRIBUTION
DIV. - 12%
2000
1500
MANF. - 38%
DIVIDEND HISTORY
1000
500
oL-1'~~~.a.-~~_JO.~--"~"'---'
1982 1983 1984 1985 1986
YEARS

Section II
Model 7475A
10
20
30
40
50
60
70
"Autost"
7475A FEATURES PLOT
CJULY 4,1983)
80
90 I
SELECT ADDRESS FOR PLOTTER INTERFACE
100 CLEAR
110 DI SP "ENTER ADDRESS"
120 DISP
130 DI SP " e9. RS-232-C
140 DISP " e9. HP-IB
150 DISP
160INPUT N
, 1 0'"
'705'"
170 DI SP " ADDRESS I S" ; N
180 IF N<99 THEN GOSUB 1280
190 I
200 I INIT 7470A & OUTPUT P1,P2 & WINDOW COORDINATES
210 I
220 OUTPUT N USING
11
1,K
11
; "INOP;"
230 ENTER N ; X1,Y1,X2,Y2
240 OUTPUT N USING
11
1, K
11
;
11
ow;
11
250 ENTER N ; X3,Y3,X4,Y4
260 I
270 I DRAW + AT P1 & P2 & LABEL COORDINATES
280 I
290 OUTPUT N USING
300 OUTPUT N USING
310 OUTPUT N USING
320 OUTPUT N USING
330 OUTPUT N USING
340 GOSUB 1180
II•, K"
II•, K"
"I, K"
"I' K"
"I' K"
350 OUTPUT N USING
11
1,K"
360 GOSUB 1220
370 OUTPUT N LISI NG "I, K"
380 I
390 I DRAW & LABEL AXIS
400 I
410 OUTPUT N USING
11
1,K"
420 FOR I•1 TO 8
430 OUTPUT N USING
11
1,K"
440 NEXT I
450 FOR I•1 TO 15
460 OUTPUT N USING
11
1,K"
470 NEXT I
480 OUTPUT N USING
11
1,K"
490 GOSUB 1180
500 OUTPUT N USING
11
1,K"
510 :iOSUB 1220
520 OUTPUT N USING "1,K"
530 OUTPUT N USING
11
1,K
11
540 OUTPUT N USING
11
1,K"
550 FOR I•15 TO 0 STEP -1
"SP1PA5080,4064PDPUSM+PA";X1;",";Y1
II CPZ, - . 3LBP1 = (" , VAL$ (x 1), II ·' II , VAL$ (y 1), II ) II , CHR $(3 )
11
PA" ; x2;
11
, " ; yz;
11
SM; "
11
cp - 16' - . 3 LB p2 = ( '' ' VAL $(x2 ) ·'
11
I
11
, VAL $(y2 ) ,
11
)
11
·' c HR$ (3 )
II PA2022' 2464"
11
PA8088,4064"
11
FT4,100,45PA9372,6440RR700,700SP2ER700,700
11
"SP2PA9144, 1016PD
11
II XTPR-1 011 '0
11
II PRO, 400YT"
"PUPA2022, 4064"
II PA8088, 5664"
"FT4, 50, 90PA9722, 5600WG350, 0, 360, 40SP3EW350,, 0, 360, 40"
''SP3PA600,3500DI0,1LBCentimetres",CHRSC3)
"PA700,6966DI"
560 IF I<10 THEN OUTPUT N USING
11
1,K" ; "CP1,0"
570 OUTPUT N USING
11
1,K" "LB" ,VALSCI ),CHRSC13),CHRSC3),"PRO, -400"
580 NEXT I
590 OUTPUT N USING
11
1,K"
600 GOSUB 1180
610 OUTPUT N USING "1,K"
620 GOSUB 1220
630 OUTPUT N USING
11
1,K"
640 OUTPUT N USING
11
1,K"
650 FOR I•O TO 8
"PA2022,5664"
"PAZOZZ, 2464"
II FT1 'o, OPA9722' 4060PT. 5WG700, 60, 60SP4EW700, 1)0, 60"
II PA1032, 756SP4"
7475-A-33-1
Figure 2-3. Test Program (Sheet 1 of 3)
2-6

Model 7475A Section II
660
670
680
690
700
710
720
730
740
750
760
770
780
790
800
810
820
830
840
850
860
870
880
890
900
910
920
930
940
950
960
OUTPUT N USING "1,K"
NEXT I
II LB" ' VAL$ (I ) ' CHR $( 13 ) ' CHR $( 3 ) ' II PR 1011 ' 0"
OUTPUT N LISI NG II I' K"
OUTPUT N LISI NG II I' K"
GOSUB 1180
OUTPUT N LISI NG II I' K"
GOSUB 1220
"PA4830,516;LBinches",CHRSC3l
II PA8088' 2464"
II PA2022' 4064"
OUTPUT N LISI NG II I' K"
I
"FT1,0,90PA9722,3570PT.5WG700,240,60SP5EW700,240,60"
! DRAW CIRCULAR FAN
I
OUTPUT N USING
11
1,K" ; "SP4PA5080,4064"
FOR I•108 TO 508 STEP 100
OUTPUT 705 LISI NG II.' K"
NEXT I
II CI II' I
OUTPUT 705 LISI NG II I' K"
DEG
"SP6IW3580,2564,6580,5564PA3580,2564ER3000,3000SP5"
FOR I•O TO 345 STEP 15
X5•5080+508•COSCI>
Y5•4064+508•SINCil
OUTPUT N LISI NG "I, K"
X5•5080+2200*COSCI)
Y5•4064+2200*SINCI>
OUTPUT N LISI NG II I' K"
NEXT I
OUTPUT N USING
11
1,K"
GOSUB 1180
OUTPUT N LISI NG II I' K"
GOSUB 1220
OUTPUT N LISI NG II I' K"
970 I DRAW LABELS
980 I
"PA" ;VAL$CINTCX5l >;" ," ;VAL$CINTCY5) lj"PD"
II PA" ; VAL$ (I NT (X5 ) ) ; II ' II ; VAL$ (I NT ( Y5 ) ) ; II PU"
I
"IWPA8088,4064;"
II PA2022' 5664"
"FT4, 50, 90PA9722, 2030WG3so .• o, 3SOSP6EW35o, o, :iso;"
990 OUTPUT N USING
11
1,K" ; "SP6PA3810,6514"
1000 OUTPUT N USING
11
1,K" "VSSI1,1SL.45LB7475A",CHRSC3>
1010 OUTPUT N LISI NG II I, K" II PA4645, 1778"
1020 OUTPUT N USING
11
1,K" "SISLLBFeatures" ,,CHR$C3l
1030 OUTPUT N USING
11
1,K" "CP-6,-1L8Plot",CHR$C3l
1040 OUTPUT N USING
11
1,K" "PA8088,5664"
1050 GOSUB 1180
1 060 OUTPUT N LISI NG II 1, K"
1070 GOSUB 1220
1 080 OUTPUT N LISI NG "11, K"
1090 I
1100 I FRAME WINDOW
1110 I
1120 OUTPUT N USING
11
1,K"
1130 OUTPUT N USING
11
1,K"
1140 END
1150 I
"PA808B,2464;"
"FT4,100,45PA9372,490RR700,700SP1ER700,700"
"PA5080,4064PDPU" ;X3;" ," ;Y3
II EA" ; X4; II 'II ; Y4; II SPOPA" ; X4; II 'II ; Y4; II ; II
1160 ! PEN TO PEN REPEATABILITY SUBROUTINES
1170 I
1180 OUTPUT N USING
11
1,K"
1190 OUTPUT N USING
11
1,K"
1200 RETURN
1210 I
"PR9, -9PD247,0,0, 18, -247,0,0,247, -10,0,0, -:~47,"
II -24 7, 0' 0' - 1 8' 24 7, 0, 0, - 24 7' 1 8' 0'0' 247PU"
1220 OUTPUT N USING
11
1,K" ; "PR0,512PD0,-1024PU-512,512PD1024,0PU"
1230 I OUTPUT N USING
11
11,K" ; "-512,0,512,o,o,-512,0,512CI512PU;"
1240 RETURN
1250 I
1260 I HP 85 RS232C INTERFACE SETUP
1270 I
1280 CONTROL 10,1
1290 CONTROL 10,2
1300 CONTROL 10,3
7475-A-34-1
16 I RECEIVED DATA GENERATES INTERRUPT
5 I ACTIVATES DTR & CTS
11 I ACT! VATES RTS, DRS & DTR
Figure 2-3. Test Program (Sheet 2 of 3)
2-7

Section II Model 7475A
1310
1320
1330
1340
1350
1360
1370
1380
1390
1400
1410
CONTROL
CONTROL
CONTROL
10,4 ; 3 I 8 BITS/WORD WITH NO PARITY
10,5 ; 16 I ENABLES HARDWIRE HANDSHAKE
10,16 ; 0 ! NO CHARACTERS SENT AT EOL
I
I 7470A-OP001 TURN-ON & CONFIGURATION
I
OUTPUT I~
OUTPUT N
OUTPUT I~
OUTPUT N
OUTPUT I~
USING
USING
USING
USING
USING
"ti' K"
"ti' K"
"ti' K"
II.' K"
"ti' K"
II 'c. (" I
"'c. J" I
"'c.K" I
"'c.Mj j j 13j 10:"
"'c.0;13:" I
1420 OUTPUT N USING "tt,K" "'c.L"
1430 ENTER N ; B
1440 DI SP " BUFFER SI ZE I S" j B
1450 RETURN
9114
TURN PLOTTER ON LIST1260
ABORT DEVICE CONTROL INSTRUCTION
ABORT GRAPHIC INSTRUCTION
TERMINATE OUTPUT WITH Cr & Lf
SET HARDWARE HANDSHAKE MODE
OUTPUT BUFFER SIZE
7475-A-35-1
Figure 2-3. Test Program (Sheet 3 of 3)
2-8

rs:
0
0..
~
P2•(10250, 7796) +
-:i
""'
-:i
Ol
>
i5
i4
7475A
13 + +
12 •
u
~
iO
aq
e;
Cl) 9
('!>
+ +
t.:l
u
~
c..
~ B
'rj
E
('!>
$1)
....
a-
+'
7
;;i
c
u
rn
tJ
--3
6
('!>
rn
....
~
5
0 + +
....
4
3 •
2
Features
Plot
1
0
aim
0 1 2 3 4 5 6 7
+ Pi• (250, 596)
Inches
r:n
('!>
(")
~-
0
:::s
~
......
c:O
......