HP 7470A User manual

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J,/
m
HRWUTT
PACKARD
" %
SERVICE MANUAL
GRAPHICS PLOTTER
SERIAL NUMBERS
This,manual applies directly to plotters
refix numben 2644V and
2517A. withwria# W
hanges described in Sec-
tion IV, this manual also applies to plot-
tenprefixed2308A, 2250A, and 2148A.
For additional important information
about serial numbers, see PLOTTERS
COVERED
BY MANUAL in Section I.
Copyright @ HEWLETT-PACKARD COMPANY 1982,1986
16399W. BERNARD0DRIVE, SAN DIEGO, CALIFORNIA 92127
I MANUAL PART NO. 07470-90000 Printed: SEPTEMBER 1984
I
i Revision A: October 198tj

... "'-
Table of Contents
TABLE OF CONTENTS
Page Section
.
Page
.
GENERALINFORMATION .............
1.1 . Introduction .......................
13 . SpcScations .....................
1.7 . SafetyConsiderations .............
1.9 . Ddption ........................
1.13 . heVoltage and Fuse
........................
Selection
1.17
. GroundingRequirements ..........
1.19 . Plottars Covered by Manual ........
1.24 . Options ...........................
1.28 . Accessonen Supplied ...............
1-30 . Packagingfor Shipment ...........
Rear Panel Switches (Option
001)
...........................
HP-IBInterface(Option 002) .....
Rear PanelSwitches(Option
002)
...........................
HewlettPackard InterfaceLoop
(Option 003)
...................
Rear Panel US/A4 Switch (Option
003) ...........................
........................
Proceseor
Read Only Memory ..............
......... Random AccessMemory
............ GateArraysA and B
Motor Supply Voltage
Comparator
...................
............
Motor ServoSystems
............
Motor Current Sensor
Pen Down Circuit
................
... Parta Removal and Replacement
Top
Case ........................
PaperDrive Motor Assembly
(Figure
55) ....................
.........
Pen Solenoid(Figure 55)
........ Pen Drive Motor and Belt
Pen Carriage. Pen Holder. and
Damper
.......................
Pen Stablw ......................
Pinch Rollers ....................
Printed Circuit Assembly ........
Pinch RollerMechanism and
.............
Paper Drive Shaft
Power Module and
Transformer ...................
............ Power Module Wiring
RecommendedTest Equipment
.....
Troubleshooting ...................
Exchange Printed Circuit
Amembly ......................
Drive Motonr andPen
Solenoid
.......................
Troubleshooting Table ...........
Test A ...........................
Test B (SeeTable 55) ............
Diagrams .......................
PERFORMANCETESTS ................
2.1 . Introduction .......................
2.3 . Basic Operating Test ..............
2.5 . Hewlett-Packard Graphics
Language
.......................
2.7 . Test Program ......................
REPLACEABLE PARTS .................
3-1 . Introduction .......................
3.3 . ExchangeAssemblies ..............
3-5 . ReplaceableParts Liat .............
3-7 . OrderingInformation ..............
3-9 . CodeLiat of Manufacturers ........
3-11 . Designations and
................... Abbreviations
....................
MANUAL CHANGES
4-1 . Introduction .......................
............... .
4-4 Serial Preh History
4.6. Changes ...........................
4-7 . Change 1 ........................
4-10 . Change 2 ........................
4-12 . Change3 ........................
415 . Change4 ........................
SERVICE ................................
51 . Introduction .......................
................. 53 . Circuit Description
57 . RS-232-C/CCm V.24 Interface
(Option001)
...................
TABLES
Tge Page Table . Page .
1.1 . Specifications ......................... 1-1 3-3 .
1-2 LineVoltage Selection ................. 1-2
1.3 . Power Cord Configuration ............. 13 3-4 .
14 . AccessoriesSupplied ................... 1-6
2.1
. 7470A HP-GLInstruction Set .......... 2-2 35 .
31 . Parta Liat. Main PCA. RS.232.C.
3.6 .
Option 001 ........................... 3.2
32 Parta Liat, Main PCA. HP.IB . 41 .
Option 002 ........................... 3-5
Parta Liat. Main PCA. HP.IL,
Option 003 ........................... 3-7
PartaList. Replaceable
....................
Mechanical Parta 3-10
..............
Manufacturers' Code List 3-12
ReferenceDesignations and
.......................
Abbreviations 3-13
History of
Serial Refir
.............................
Changes 4-1
Revision
A: October 1986 iii

Tableof Contanb
Model 7470A
TABLES (Continued)
4-2
Parta Lirt, Main PCA, RS-2324.
Option001 ...........................
4-3 .
Pam Lirt, Main PCA HP.IB.
Option 002 ...........................
44 .
Parta Lht, Main PC& HP.IL,
Option 003 ...........................
4-5 . Parta Lirt, Main PC& RS-2324.
option 001 ...........................
Pae Table
.
ILLUSTRATIONS
Parta List, Main PC& HP.IB.
........................... Option 002 4-20
RS-232-C/CCm V.24 IntarfaceSial
bvls ............................... 5-1
Baud
Rate %action ................... 5-2
.................. HP-IBInterface Lines 5-3
RecommendedTeat Equipment ......... 5-13
Troublwhwting ....................... 5-15
Fie- paoe Fie-
Top CareRemoval ..................... 1-2 5-45 .
Line VoltageSelection ................. 13
Power Cord Cdguntiona
............ 13 5-6 .
Tat Program .......................... 24 5-7 .
ParformanceVdcationPlot .......... 2-6 58 .
Exploded View ........................ 3-11 5-9 .
SchematicDiagram. RS-232-C. 5-10 .
Option 001 ........................... 4-5 5-11 .
Schematic Diagram. HP.IB. 5-12
Option002
........................... 4-9 5-13 .
Schematic Diagram. HP.IL, 5-14
.
Option003 ........................... 4-15 5-15 .
SchematicDiagnunr. Power Suppk ... 4-23
RS2324/CCTX' V.24 Interface 5-16 .
Circuih ............................. 5-2
HP-IL Interface Citr ............... 54 5-17 .
ServoSystamBlock Diagram .......... 5-45
..................... TopCase Removal 5-6 5-18 .
Paper Drive Motor and Pm
Solenoid .............................
Pen Drive .............................
Pen Stablw ............................
Pinch Rollem ..........................
............ ChauiaAuambly Removal
....... Under Sideof Chauir Auembly
Power Module Ramoval ................
PowerModule Wiring ..................
Schematic Diagram No- .............
ANSI Y3214LogicSymbol8 ...........
SchematicDiagram. RS-2324. Option
001
..................................
Schematic Diagram. HP.IB. Option
002
..................................
Schematic Diagram . HP.1 L. Option
. . .
003 ..................................
SchematicDiagram, Pow= Suppliaa ....
Fievirion A: October 1986

. -
Safety Symbob
Genenl Definitionsof Safety Symbols Used On Equipment
International caution symbol (refer to manual): the product will be
marked with this symbol when it is necessary for the user torefer
to
the instruction manual in order to protect against damage tothe
instrument.
4
Indicatesdangerousvoltage (terminalsfed from the interior by
voltage exceeding
1000 volts must be so marked).
Protectiveconductor 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 pound before
operatingequipment.
Low-noise or noiseless, clean pound (earth)
terminal. Used for a
signal common,
as well as providing protection against electrical
shock in case of a fault. Aterminal marked
with this symbolmust
be connected to ground in the manner described in the installation
(operating)manual, and before operating the equipment.
Frame or chassis terminal. Aconnection
to the frame (chassis)of
lj7 OR A the equipmentwhich normally includes allexposed metal struc-
tures.
- Alternatingcunent
-
000 Direct cuxrent
G Alternatingor direct current
The WARNING sign denotesa 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-
eratingprocedure, 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.
Revision A: October 1986

7470A
lNTROOUCTION
--
section I
SECTION I
GENERAL INFORMATlON
Table 1-1. Swcations
1.2.
Thb dce manual con- informationnecea-
sary to test and service the Hewlett-Packard Model
7470A Plotkr. Thin manual is divided into fivesections
aa foilown:
1 - General Information
I1 - PerformanceTests
III - Replaceable Parts
IV - ManualChanges
V -Senrice
13. Information for interfacing and operating the
Model 7470A will
be found in thefollowing:
Title
-
Interfacingand Program- .
ming Manual
OperatingManual
InterconnectionGuide
Programmer's Reference
HP Psrt Number
14. This General Information section contains the
spdicationsand option andaccemoryinformation.
I
1-5. SPECIFICATIONS
1 1-6. Table 1-1lists the sptdicatiom for the Model
I 7470A. These spaQfications include the performance
standardsagainst which the plotter
is tested.
1-7. SAFETY CONSIDERATIONS
1. Safetyinformation relevant to the service pmcc
dun being described ia provided in the appropriate
sections of this manual. The Model 7470A and this
manual should be reviewed for safety markings and
instructionsbefore senricework
is begun.
1 DESCRIPTION
1-10. The Model 7470A accepta digital informationto
produce graphic plots on
X 11 in. or IS0 A4 (210
X 297 mm) paper or special transparency plastic. Dis-
posable pens
are available in variousink colors.
1-11. The two-pen capability permits more than one
color to
be used in a plot without the necessity of
stopping the plotter to change pens manually. Pens
are automatically capped when in the pen stables. A
pen that is in the pen carriage will be automatically
replaced in its stable when the PAPER LOADIHOLD
lever is moved to the LOAD position. Either pen may
MAXIMUM PLO'ITING AREA
Y axis: 190 mm (7.5 in.)
X axis: 273 mm (10.7 in.) metric
258 mm ( 10.2 in.) English
REPEATABIUTY
With the same pen: 0.1 mm (0.004 in.)
With a differentpen: 0.2 mm (0.008 in.)
PENVELOCX'IY
Pen down: maximum, 38.1 cm/s (15in./s)
programmable,1 to 38 cm/s in
1cm/s increments
Pen up: 50.8 cm/s (20in./s)
ADDRESSABLE STEP SIZE
0.025 mm (0.00098in.)
ACCELERATION
Approximately2g
POWER REQUIREMENTS
Source: 100,120,220,or 240 V- -1096, +5%
Frequency: 48 to 66 Hz
Consumption: 25 W maximum
SIZE
Length: 432 mm (17in.)
Width:
343 mm ( 13.5 in.)
Height: 127 rnm (5 in.)
WEIGHT
5.7 kg (125Ib)
be selected by program control or by pressing the PEN
LEFT (1)or PEN RIGHT (2)button. To replace a pen
in
its stable, hold the ENTER button down while
pressing the appropriate pen select button.
1-12 Seven different line types are provided. Label-
ingcan
be donein five character setsplua userdefined
characters (except in HP-IL Option 003). Text (label-
ing)
can be written in any direction, upright or slanted.
Character size
is also variable.
1-13. LINEVOLTAGE AND FUSE SELECTION
To prevent damageto theplotter, make
sure the line voltageselectionand fuse
protection
is correctbefore connecting
line power.
Revision A: October 1986

Section I Model 7470A
The line power cord and power outlet
must have a protective earth (ground)
contact.
1-14. The 7470A primary power circuit can be con-
figured to operate from any one of the following power
sources ata line frequency of
48 to 66 Hz, single phase.
Maximum power used is
25 W.
1-15. Line voltage selection is identified on the label
visible in the small receased window in the rear panel.
Applying line voltage of
220 Vor 240 V
to the plotter while the line voltage
selection is set for
100 V or 120 V
operation may damage the plotter
circuits.
1-16. The line voltage selection may be changed to
conform to the line voltage in a particular area Use
the following procedure.
F]
The followingprocedure should be per-
formed only by servicatrained person-
nel who
are awareof theelectrical shock
hazards involved.
a. Set the plotter LINE switch to OFF (0) and dis-
connect the line cord.
b. Remove the plotter top case by removing the
screws indicated in Figure
1-1. Lift the rear of
the top case and the front will release. When
replacing, make sure the PAPER HOLD lever
extends through the case. and the tabs inside
the front of the top care
align properly above
and below the bare plate.
11\1\1111"""
REMOVETHESE SCREWS
TO RELEASE
TOP CASE
74704-2.1
Figure 1-1. Top Case Removal
c. Line voltage selection
is determined by the power
input connections to the transformer primary
windings. Table
1-2 lists the wire colors and
transformer contact connections for each line
voltage. Thetransformer pin numbers areiden-
tified on the power module molding. Figure
1-2
illustrates the connections for each voltage.
Changethe wire connections asrequired to con-
form to the desired linevoltage selection.
Make sure the line fuse is correct
accordingtoTable
1-3. Thefuseholder
cap is the bayonet type. Press and
turn counterclockwise
to remove,clock-
wise to lock.
d. 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.
Table
1-2. Line Voltage Selection
*Wireidentification is by color code:
8 =CRY
928 = WHT:RED/GRY
958 = WHT:GRN/GRY
NOMINAL
LINE
VOLTAGE
100 V
120 V
220 V
240 V
TRANSFORMER PRIMARY CONNECTIONS*
PIN
1
8
8
8
8
PIN 2
928
NC
958
NC
PIN
3
958
928
NC
958
PIN 4
8
8
958
958
PIN 5
958
928
928
928
PIN 6
NC
958
8
8
PIN 7
928
958
928
928

7--
Model 7470A
--
Section I
HP Part Number 8120-1369; 250 V, 10 A, 1 4
plug rating. For use in Australia, New
Zealand
OptionNo.
HP Part Number 8120-1351; 250 V, 13 A, 1 4
900
plug rating. For me in United Kingdom.
Cyprus, Ni Zimbabwe,Singapore.
0
0
NEMA b15P
9
NEMA 615P
SEV 1011
cT3
n
0
(=j
NOTE AU plugs are viewed from connectorend.
L = Lineor ActiveConductor (also called "live" or "hot")
N
= Neutral or Identified Conductor
E
= Earth or Safety Ground
!.A-184
HP Part Number 8120-1689; 250 V, 10/16 A,
1 4 plug rating. For use in East and West
Europe, Egypt
-
HP Part Number 8120-1378;135 V, 15 &'.I 6
plug rating. For use in Canada, Japan,
Mexico, Philippinen, Taiwan, Saudi Arabia,
UL approved in United States.
HP Part Number 81204698; 250 V, 15 A, 1 4
plqgrating. For use in Canada, UL approved
in United Statea
HP Part Number 8120-2104; 250 V, 10 A, 1 6
plug rating. For use in Switzerland.
HP Part Number 8120-W, 250 V, 10 A, 1 4
plug rating. For use in Denmark.
HP Part Number 81204211; 250 V, 10 A, 1 &
plug rating. For use in India, Republic of
South
Africa.
Figure 1-3. Power Cord Configurations
Revision
A: October 1986 1-5

Table 14. Acceuoricrr Supplied
OperatingManual
I I
DESCRIPTION
*Intarfacingand Pmgramming Manual
Interconnection Guide
I
1
I
Qm
1
Programnier's Referam Card
I I
*.Plotter paper, 8% x 11 in., 50 ah&
I
1
I
Package of 5 fiber tippenr. 0.3 mm nib
width.
1 each red, blue, green. black. yellow
I1
HP PART NUMBER I
*Supplied with Option 001 only.
*.Paper size A4 (210 x 297 mm) HP PartNo. 17802P may be rupplid,based on the destination of the plotter.
1-32. If the original packaging material har been re
c. Urn a layer of shock-absorbingmaterial atleast
tained. pack the plotter in the same manner as it was
70 to 100 mm (3 to 4 in.) thick around all side8
received. The following general instructionr should be
of the plotter to provide firm cushioning and
used for packingwith commercially availablemateriala. preventmovementinsidethe container.
a. Wrap theplottar
in heavy paper or plertic.
b. Ure a rtrong hippingcontain-.
d. Seal contain- securely.Mark contain- FRAGILE
to enrurecarefulhandling.
Revirion A: October 1986

Section 111
1 7470A
SECTION Ill
REPLACEABLE PARTS
&1. INTRODUCTION Table 3.3 = Option 003 PCA
Table
3-4 = Mechanical parts
3-2.
Thie section contains information for ordering
parts for the HP Model 7470A Plotter. Included are
3 ORDERING INFORMATION
lista of electrical and mechanical parte and an illue-
tration of mechanical parts.
3-8.
To obtain replacement parts or aesembliee ad-
dress anorder or inquiry to the nearest Hewlett-Packard
3-3. EXCHANGEASSEMBLIES
Salesand Support Office.Include the HP Part Number,
the check digit (listed under the heading "CD" in the
3-4. Part numbers for aesembliee that are available parte list).the description. and thequantity required.
on an exchange basis are listed in theparts lists below
the new assembly number. These factory repaired and
3.9. CODE LIST OF MANUFACTURERS
tested assemblies areavailable only on a tradein basis:
therefore. the defective assembly must be returned for
3-10.
Table 3.5 lists the fivedigit code numbers as-
credit. For this reason. aseemblieta required for spare simedto the manufacturers of pans in the Model
7470A
parts stock must be ordered by the new part number. Plotter. These code.numbers appear with the parts in
Tablee 3-1 through 3-4 as an aid for ordering replace
3-5. REPLACEABLEPARTS LISTS
ment parts directly from the manufacturer.
3-6.
Electrical parts for the 7470A are lieted in Tables
3-11. DESIGNATIONSAND ABBREVIATIONS
3.1 through 3-3. Table 3.4 is a list of mechanical parts
which are illustrated in Figure
3-1.
3-12. Table 34 lista designations and abbreviationsueed
throughout this manual. Abbreviations in the parts
Table
3-1 = Option 001 PCA lists are always capital letters. In other parts of the
manual both upper and lower case abbreviations are
Table
3.2 = Option 002 PCA used.