HP 7418a schematic
TM11-6625-2752-14&P
(NSN6621-00-621-6568)
WARNING
TM11-6625-2752-14&P
TM11-6625-2752-14&P
(NSN6625-00-621-6568)
o-i
TABLE OF CONTENTS
TM11-6625-2752-14&P
Paragraph
SECTION 0. INTRODUCTION .......0-1
SECTION I. GENERAL INFORMATION .......1-1
1-1. Introduction..............1-1
1-3. Eight-Channel Recorder..........1-1
1-9. Application and Specifications.......1-1
1-13. Accounts and Optics 1-2.
1-15. Preamplifier 1-2
SECTION II. INSTALLATION..........2-1
2-1. Initial Inspection.........2-1
2-3. Mechanical Check..........2-1
2-5. Performance Tests.............2-1
2-7. Damage Claims..............2-1
2-9. Storage.......2-1
2-11. Installation ............2-1
2-13. Premaplifier Installation.........2-1
2-15. Power Connections.............2-1
2-18. Signal Connections............2-1
2-22. Remote Control and Marker Connections .,.2-4
SECTION III. OPERATION..........3-1
3-1. Introduction..........3-1
3-3. Control Locations.........3-2
3-5. System Operation.........3-3
SECTION IV. PRINCIPLES OF OPERATION
4-1. Introduction.........5-2
4-4. Preamplifier Power Supply 8848A.....4-0
4-7 Guarded Input Circuits..........4-1
4-9. Unregulated 18 Volt Supplies.......4-1
4-11. Preamplifier Supplies...........4-1
4-13. Oscillator Supply..........4-1
4-14. Regulated 12 Volt Supplies.........4-1
4-16 regulator Assembly..........4-1
4-18. 440 Hz Oscillator...........4-2
4-21. 2400 Hz Oscillator............4-2
4-24. Recorder Signal Circuits..........4-4
4-28. Galvanometer Dumping..........4-4
4-30. Damping.........4-4
4-31. Stylus Linkage.........4-4
4-33. Galvanometer Position Feedback.......4-7
4-37. Host Control Circuit........4-8
4-39. Power Control Circuits..........4-8
4-43. Chart Drive...............4-8
4-45. Chart Motor..............4-8
4-47. Speed Control............4-8
4-50. Speed Selection Solenoids.......4-11
4-51. Power Flow...............4-11
4-52. Paper Feed...........4-11
Page
Paragraph
4-54.
4-56.
4-58.
4-60.
4-61.
4-62.
4-63.
4-64.
4-66.
4-69.
4-70.
SECTION V. MAINTENANCE............5-1
5-1.
5-3.
5-5.
5-8.
5-10.
5-12.
5-16.
5-18.
5-20. Electrical Checks............5-4
5-22.
5-24.
5-26.
5-27.
5-28.
5-29.
5-31. Stylus Pressure Adjustment
5-32. Stylus Center Adjustment
5-33. Stylus Parallax Adjustment
5-34.
5-35. Stylus Removal and Replacement
5-37.
5-38.
5-40.
5-43.
5-46. Paper Table Disassembly
5-48.
5-49. Pressure Roller Replacement
5-50. Drive Roller Replacement
5-51.
5-53.
5-54. Gearbox Removal
5-55.
5-56.
Page
Recorder Power Supply and Regulator
Circuits.........4-13
Recorder DC Power Supplies.......4-13
Regulator/Oscillator..........4-13
+5 Volt Regulator...........4-13
+12 Volt Regulator......4-13
_12 Volt Regulator...........4-13
200kHz.................4-13
Oscillator Regualtion Circuit.......4-13
Marker Circut...........4-13
Marker Switches.......4-14
Marker Heat Driver...........4-14
Introduction.............5-1
Test Equipment and Lubricants........5-1
Performance Checks....................5-1
Variable Line Voltage...........5-2
Proventive Maintenance.........5-2
Operational Checks and Inspection.....5-2
Cleaning...............5-4
Lubrication.............5-4
Adjustments and Minor Repairs........5-4
Paper Drive Adjustments.........5-4
Paper Tracking Adjustment
Paper Timing Check
Paper Tension Adjustment
Stylus Adjustments
Channel Time Synchronization
Stylus Lapping
Corrective Maintenance
Galvanometer Removal and Replacement . 5-20
Drive Unit Removal and Replacement
Platen Replacement
Gerbox Removal and Overhaul
Gearbox Inspection
Gearbox Disassembly and Lubrication
(Overhaul)
Gearbox Lubrication
...........5-17
............
...............
.......
..........5-17
.......
.......
........
......
.....
...........
...........
.........
...........
......
........
.....
...........
..........
....
. . 5-22
5-17
5-17
5-17
5-18
5-19
5-19
5-19
5-20
5-20
5-24
5-24
5-24
5-24
5-27
5-27
5-27
5-28
5-28
i
TM11-6625-2752-14&P
TABLE OF CONTENTS
Paragraph
5-57.
5-58.
5-59.
5-61.
5-62.
Gearbox Reinstallation. . . .5-31
Gearbox Run-In. . . . . . . . . . . . . . .5-34
Marker Assembly Maintenance. . . . . . . . . .5-34
APPENDIX
Figure
1-1
Model 7758A and 7418A Recording
Systems. . . . . . . . . . . . .1-0
8848A Preamplifier Power Supply. . . . . . .1-1
1-2
2-1.
2-2
2-3.
Recorder Access for Receiving Inspection . . . .2-2
Rear Panel Connectors and Fuses. . . . . . . . .2-3
Recorder and Mobile Cart Power
Connections. . . . . . . . . . . .2-4
2-4.
1065-Series Cabinet Power Module and
Schematic Diagram (typical). . . . . . . . . . 2-5
2-5.
2-6.
Output Adapter 14208A, 142088. . . . . . . .2-6
System Connection (with Control Section
4682A). . . . . . . . . . . . . 2-7
2-7.
Preamplifier Power Supply 884A. Input and
Output Connection. . . . . . . . . . . 2-8
2-8.
7418A System Input Cable Preparation (Multi- Text
channel Amplifier Options 030, 031). . . . . . 2-9
Cabel and Connector Assembly Diagrams for
2-9.
SIGNAL, MONITOR, and REMOTE Rear
Panel Connectors, Models 7758A, 7418A. 2-10
Option 001, 010 Mounting Kit 07758-60400 2-11
2-10.
3-1
4-1.
Control Locations. . . . . . . . . . .3-1
3-2.
Paper Loading Procedure. . . . . . . 3-2
Preamplifier Power Supply., Simplified
Diagram. . . . . . . . . 4-0
4-2.
12-Volt Regulator Circuit Power
Supply 8848). . . . . . . . . . . 4-2
4-3.
440 Hz Oscillaotr Circuit (Preamplifier Power
Supply 8848A). . . . . . . . . . . 4-3
4-4.
2400 Hz Oscillator Circuit (Preamplifier Power
Supply 8848A). . . . . . . . . . . 4-3
4-5.
4-6.
Galvanometer Damping. . . . . . . . . .4-4
Recorder Signal Circuits, Simplified Diagram. . .4-5
ii
Page
Gearbox Shift Play Adjustment. . . . 5-31
Paragraph
SECTION VI. REPLACEABLE PARTS. . . . . . . . 6-1
Page
Solanoid Adjustment. . . . . . . . . . . . . .5-31
Introduction. . . . . . . . . . . . . . .6-1
6-1.
6-4.
Reference Designations. . . . . . . . . . . . . . . . 6-1
6-10.
Ordering Information. . . . . . . . . . . . . . . .6-2
A .DIFFERENCE DATA SHEETS. . . . . . . . . . . . . . . . . . . .A-1
B. DIFFERENCE. . . . . . . . . . . . . . . . . . . . . B-1
C. MAINTENANCE ALLOCATION. . . . . . . . . . . . . . . . . . . . .C-1
D. REPAIR PARTS AND SPECIAL TOOLS LIST. . . . . . . . . . . . . .D-1
LIST OF ILLUSTRATIONS
Page
Figure Page
4-7.
4-8.
4-9.
Model 7758A, 7418A Recorder, Block Digagram 4-6
Galvanometer Position Feedback Circuit. . . 4-7
Recorder Power Control Circuit, Simplified
Diagram. . . . . . . . . . . . . .4-9
4-13.
Chart Drive Gears. v. . . . . . . . . . . . .4-9
Gearbox Power Flow. . . . . . . . . . . . 4-10
Paper Feed Path. . . . . . . . . . . .4-11
Recorder Power Supply and Regulator Ciruits,
4-10.
4-11.
4-12.
Simplified Diagram. . . . . . . . . .4-12
4-14.
Marker Heat Driver Output Current
Waveforms. . . . . . . . . . .4-14
Recorder Test and Adjustment Points. . . . .5-3
5-1
Recorder Lubrication Points (Typical). . . . . . . .5-5
5-2
5-3
Preamplifier Power Supply 8848A, Power
Test Points, Test Cable. . . . . . . . . .5-7
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-12.
5-13.
Test Cable and Fixture. . . . . . . . . . . .5-8
Driver or Regulator Board Test Setup. . . . . .5-9
Regulator/Oscillator Board Test Points. . .5-11
Driver Amplifier Board Test Points. . . . . . .5-14
Paper Tension Adjustment. . . . . . . . . .5-18
Stylust Adjustments. . . . . . . .5-19
Channel Time Synchroniztic Adjustment 5-20
Stylus Removal and Replacement. . . . .5-21
5-11.
Stylus Lapping Procedure. . . . . . . . .5-22
Drive Unit and Galvanometer Mounting
Screws. . . . . . . . . . . . . . . . . .5-23
Drive Unit Removal and Replacement. . .5-24
5-14.
5-15.
Paper Removal, Table Link and Drive
Roller Disassembly. . . . . . . . . . 5-25
Gearbox Removal. . . . . . . . . . .5-26
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
Gearbox Disassembly. . . . . . . . .5-29
Clutch Lubrication. . . . . . . .5-30
Gearbox Shaft End Play Adjustment. . . . . . . 5-31
Gearbox Solenoid Adjustmentl. . . . . . . . . .5-33
Marker Assembly Adjustment and Removal 5-34
LIST OF FIGURES
TM11-6625-2752-14&P
Figure
6-1.
6-2.
6-3.
6-4
6-5.
Page
6-3
6-22
6-22
6-23
Figure
6-18
6-19
6-20.
6-21.
6-23
6-6.
6-7.
6-8.
6-9.
6-10.
6-24
6-25
6-26
6-27
6-28
6-22.
6-23.
6-24.
6-11.
6-29
6-25.
6-12.
6-30 6-26.
6-13.
6-14
6-15.
6-16.
6-31
6-31
6-32
6-33
6-27.
6-28.
6-17.
6-33
6-29.
Page
6-34
6-35
6-35
6-36
6-41
6-41
6-42
6-42
6-43
6-43
6-44
6-45
Table
Page
1-1.
1-2.
1-3.
5-1.
5-2.
5-3.
1-2
1-3
1-4
5-1
5-2
5-6
Table
5-4.
5-5.
6-1.
6-2.
6-3.
Page
5-9
5-32
6-4
6-21
6-36
6-4.
6-40.1
iii
TM11-6625-2752-14&P
Section I - Channel Information
Models 7758A, 7418A
07758-1
1-0
Figure 1-1. Model 7758A and 7418A Recording Systems
SECTION O
0-1. SCOPE.
0-2. INDEXES OF PUBLICATIONS.
0-3. FORMS AND RECORDS.
TM11-6625-2752-14&P
0-4. REPORTING EQUIPMENT IMPROVEMENT (EIR).
0-1
TM11-6625-2572-14&P
0-5. ADMINISTRATIVE STORAGE.
0-2
INTRODUCTION.
1-1.
1-2.
1-3.
1-4.
SECTION I
1-6.
1-7.
TM11-6625-2752-14&P
Section I - General Information
Models 7758A, 7418
07758-1
1-5.
1-8.
1-9.
1-11.
Figure 1-2. Preamplifier Power Supply
1-12.
1-1
TM11-6625-2752-14&P
SECTION I. General Information
Models 7758A, 7418A
07758-1
1-13.
1-14.
1-15.
1-16.
1-17.
Table 1-1. Specifications
1-2
Table 1-1. Specifications (continued)
TM11-6625-2752-14&P
SECTION I -
General Information
Models 7758A, 7418A
07758-1
Bench Enclosure (Accessory
(30.2 cm). Width, 20.25 in. (51 cm). Depth, 24 in.
(60.5 cm). Paper Takeup Tray projects 11.5 in. (29.2
cm) from front enclosure and hangs down 5.5 in.
(13.8 cm).
Mobile Cart: Height, 50.5 in. (128 cm). Width, 21.5
In. (55 cm). Depth, 26 in. (67 cm). Paper Takeup
Tray projects 11.5 in. (29.2 cm). Add 6 in. (15 cm)
to
WEIGHT: Recorder alone: 110 lb (49.9 kg including
driver amplifiers. With bench top enclosure: 128 lb
(58 kg). In mobile cart with power supply, but less
preamplifier: 354 lb (160 kg).
Each Channel: Position (10 div trim), Gain,
Damping, High Limit, Low Limit.
POWER REQUIREMENTS: 60 Hz or 5O Hz (option-
al), 115/230 Vac), 10% Power consumption is less
-than 5A in 115 Vac operation. Warmup Time:
Approximately
DIMENSIONS:
ENVIRONMENT: Maximum ambient temperature
(free air circulation) 40 C (104 F); if blocked from
free air flow, 25 C (77 F). Location should be
reasonably free from dust, explosive or corrosive
vapors, and extreme cold.
C0NNECTIONS: Signal Input J12 for preamp signals
from power supply. Through Signal Monitor J13,
preamplifier outputs for monitor scope, tape, and
Recorder Alone: Height, 10.5 in. 26.6 (cm) Width,
19.0 in (483 cm), for standard RETMA equivalent
rack. Depth, 22.75 in. (57.3 an). Projects 2.5 in. (6.3
an) from front of rack.
inputs, low voltage dc power and remote control
functions.
Width
or Depth for caster projections
devices are available at the rear
to preamplifier inputs and auxiliary
): Height, 11.875 in.
Table 1-2. 8848A Preamplifier Power Supply
Regulated Outputs:
+12Vdc at 800 mA maximum.
- 12Vdc at 800 mA maximum.
Ripple not more than 4 mV under full load.
Unregulated outputs:
+18Vdc at 600 mA maximum.
-18Vdc at 600 mA maximum.
(Current capacity is 1.4 amperes minus current
supplied by regulated output circuits.)
Power Requirements:
115 or 230 volts (switch provided), 50 to 400
Hz, 120 watts full load.
Specifications
Oscillator Outputs:
440 Hz + 2% floating, 14Vac peak-to-peak, 4
watts maximum. Amplitude stability + 5%.
2400 Hz 2% floating, 10Vac rms, 50 mW
maximum. Amplitude stability + 5%.
Weight:
About 26 lbs. (11,8 Kg) less preamplifiers.
Dimensions:
7 in. high x 19 in. wide x 2O in. front-to-back
(178x483x521 mm).
1-3
TM11-6625-2752-14&P
SECTION I- General Information
Models 7758A, 7418A
00758-1
Table 1-3. Recorder Options and System Options
045 System installed in 1065B tall cabinet, with
051 With writing shelf on right side facing system
cabinet or cart.
052 With writing shelf on left side facing system
cabinet or cart.
053 With l top-mounted tilt stand for display on
1064C cart or 1065C short cabinet.
054
With 14217A Transducer Holder for two 1280Series Physiological Pressure Transducers,
mounts on IV Pole.
055 System installed in 1065C short cabinet, with
paper tray.
057
With 14217-6O010 mount for IV pole on right
side, facing cart or cabinet. Accepts 0.25 to
0.75 inch (0.63 to 1.9 cm) diameter IV pole.
Includes pole for mounting Option 054 Trans-
ducer Holder.
058 Same as Option 057 except mounted on left
side.
078 Lass 8848A Power Supply and enclosure,
7758A System.
Less 8848A Power Supply, 7758B, C, or D
System.
079 Add Power Supply Enclosure for 77588
system.
080 Replace paper takeup tray with 7-inch high
paper takeup drawer on rack mount slides.
081 Add 3 inch supply drawer.
082
Add 7-inch supply drawer.
1-4
TM11-6625-2752-14&P
SECTION I-General Information
Table 1-3 Recorder Options and System Option (continued)
Models 7758A, 7418A
07758-1
1-5
2-1.
2-3.
2-4.
2-5.
2-6.
TM11-6625-2752-14&P
Section II -Installation
Module 773A, 7412A
SECTION II
2-13.
2-14.
23758-1
2-7.
2-8.
2-9.
2-10.
2-11.
2-15.
2-16.
2-17.
2-3)
2-18.
2-12.
2-19.
2-1
TM11-6625-2752-14&P
Section II.-Installation
Module 7758A, 7418A
87738-1
2-2
Figure 2-1. Recorder Access for Receiving Inspection
TM11-6625-2752-14&P
Section II.-Installation
Module 7758A, 7418A
07728-1
Figure 2-2. Reer Panel Connectors and Fuses
2-3
TM11-6625-2752-14&P
Section II-Installation
Module 7758A, 7418A
07158-1
2-20.
2-21.
2-4
Figure 2-3. Recorder and Mobile Cart Power Connections
2-22.
2-23.
TM11-6625-2752-14&P
Section II-Installation
Module 7758A, 7418A
07758-1
Figure 2-4. 1085-Series Cabinet Module and Schematic Diagram (typical)
2-5
TM11-6625-2752-14&P
Section II-Installation
Module 7758A, 7418A
07758-1
2-6
Figure 2-5. Output Adapter 14208A, 14208B
TM11-6625-2752-14&P
Section II-Installation
Module 7758A, 7418A
07758-1
Figure 2-6. System Connections (with Control Section 4682A)
2-7
TM 11-6625-2752-14&P
Section II - Installation
2-8
Figure 2-7.
lifier Power Supply Input and Output Connections
TM 11-6625-2752-14&P
Section II - Installation
Figure 2-8. 7418A System Input Cable Preparation (Multichannel Amplifier Options 030, 031)
2-9
TM11-6625-2752-14&P
Section II-Installation
Models 7758A,7418A
07758-1
Figure 2-9. Cable and Connector Assembly Diagrams for SIGNAL, MONITOR and REMOTE Rear Panel Connector
Models 7758A, 7418A
2-10
TM11-6625-2752-14&P
Section II-Installation
Models 7758A, 7418A
07758-1
Figure 2-10 Option 001,010, Mounting Kit 07758-60400
2-11
3-1. INTRODUCTION..
3-2.
3-3.
3-4.
3-5.
3-6.
SECTION III
OPERATION
TM11-6625-2752-14&P
Section III-Operation
Models 7758A, 7418A
07758-1
Figure 3-1. Control Locations
3-1
TM11-6625-2752-14&P
Section III-Operation
Models 7758A, 7418A
07758-1
3-2
Figure 3-2. Power Loading Procedure, Models 7758A. 7418A
TM11-6625-2752-14&P
Section III-Operation
Models, 7758A, 7418A
07758-1
CAUTION
Figure 3-2. Paper Loading Procedure, Models 775BA, 7418A (continued)
3-3
TM11-6625-2752-14&P
Section IV- Principles of Operations
Models 7758A, 7418A
00758-1
4-0
Figure 4-1. Preamplifier, Power Supply, Simplified Diagram
SECTION IV
PRINCIPLES OF OPERATION
TM11-6625-2752-14&P
Section IV-Principles of Operation
Models 7758A, 7418A
07758-1
4-1. INTRODUCTION.
4-2.
4-3.
4-7.
Guarded Input Circuits.
4-8.
4-9. Unregulated 18 Volt Supplies.
4-10.
4-11.
4-4. PREAMPLIFIER POWER SUPPLY 8848A.
4-5.
4-1
4-6.
4-13.
4-14.
4-15.
4-16.
4-1
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