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

TM11-6625-2752-14&P

Section IV-Principles of Operation

Models 7758A, 7418A

00758-1

4-17.

4-20.

4-21.

4-18.
4-19.

4-22.

4-2

Figure 4-2. 12-Volt Regulator Circuit (Preamplifier Power Supply 8848A)

TM11-6625-2752-14&P

Section IV-Principles of Operation

Models 7758A, 7418A

Figure 4-3. 440 Hz Oscillator Circuit (Preamplifier Power Supply 8848)

07758-1

4-23.

Figure 4-4. 2400 Hz Oscillator Circuit Preamplifier Power Supply 8848A)

4-3

TM11-6625-2752-14&P

Section IV-Principles of Operation

Models 7758A, 7418A

07752-1

4-24.

4-25.

4-26.

4-27.

4-28.

4-29.

4-30.

4-31.

4-32.

4-4

UNDERDAMPED

Figure 4-5. Galvanometer Damping

TM11-6625-2752-14&P
Section IV-Principles of Operation

Models 7758A, 7418A
07758-1

Figure 4-7. Model 7758A/7418A Recorder, Block Diagram

4-6

TM11-6625-2752-14&P
Section IV-Principles of Operation

Models 7758A, 7418A

07758-1

Figure 4-6. Recorder Signal, Circuits, Simplified Diagram

4-5

TM11-6625-2752-14&P
Section IV-Principles of Operation

Models7758A, 7418A

07758-1

4-33.

4-.34.

4-35.

Figure 4-8. Galvanometer Position Feedback Circuit

4-7

TM11-6625-2752-14&P

Section IV-Principles of Operation
Models 7758A, 7418A
07758-1

4-36. An example of unbalance is shown in Figure 4-8. As

the positive signal causes the galvanometer to move the

stylus as shown, the rotor moves so that more of the

oscillator output is felt on the split capacitor
plates/. These plates are connected to the CR1-Q1 half of
the demodulator, so that more positive voltage is impressed

upon C1. The unshaded plates receive proportionately less

of the oscillator output, and so CR2-Q2. the negative side

of the demodulator, produces less positive output for C1.

C1, then, sends a positive feedback voltage to the driver

amplifier, which tends to return the stylus toward the

center of the chart. The feedback voltage is sided by a
torsion spring that facilitates setting of the sylus mechani-

cal center. For maintenance purposes, note that one volt of

position voltage corresponds to 10 division s of stylus

movement

4-37.

4-38.

Stylus heat is controlled from the Heat Pot Board,
A2A2, on the front panel. The heat control voltage is
applied to a simple feedback amplifer located on the driver
amplifier assembly. Q11, Q12, and Q13, which has a
current limiting circuit similar to that used for the
galvanometer. The amplifer output drives the resistive
stylus heat element. A good stylus should have about 34
ohms resistance.

4-39. Power Control Circuits

works, the -20V supply voltage, applied to

to the switch via

the main feeder line at the top of Figure 4-9 energizes the

center contacts of the switch segment. /when the push-

button marked "5" is depressed, -20V is applied to

solenoids. L3 and L4 through diodes CR5 and CR6,

respectively, aelecting the

speeds of 5 mm/sec

ted

by fixed voltages applied to the heat control

proper gear combination

and higher, the

heat control voltage is

In

potentiometers by the control switch. The heat control
potentiometer setting permits front panel adjustment of the
trace density through the heat control circuit each driver
amplifier.

4-43. CHART DRIVE.

4-44. The recorder chart drive consists of a 115 volt ac
motor, a gearbox with four pairs of clutches and speed
selection solenoids, a paper drive roller, and a paper brake.

4-45. Chart Motor.
4-46. The chart motor is a continuous duty, synchronous

motor with a speed of 1800 rpm for 60 Hz operation. A

pulley on the motor shaft engages a drive belt

that

transmits power to the gearbox. To provide additional

electrical safety, the motor IS Insulated from the recorder

chassis by non-conducting spacers.

4-40. Power IS controlled from the recorder front panel.
Figure 4-9 shows recorder power switching together with
chart motor control circuits and speed control solenoid
circuit.

4-41

Line common reaches the chart drive motor through

Sl, the power switch and the Ul voltage selector, whenever

Sl IS on. The high side of line power IS applied to the chart
drive motor through motor relay Kl, which is actuated

by

the control switch RUN button on the front panel, or
a remote run signal (Figure 2-9). The motor is described
further in Paragraph 4-46. Kl also turns on

stylus

heat

through the control switch.
4-42. The motor drives the gearbox, the speeds of which

are controlled by speed selection solenoids Ll, L2, L3, and
L4. The speed control action of these solenolds is described

in Paragraph

4-51. The segments of the control switch are
so arranged that the solenoids are energized in the correct
combinaiton for each speed desired. The switch IS

shown in

the 5 mn/sec position. As an example of how the switch

4-8

4-47.
4-48.

Control.

Chart paper speed IS varied by a gear train consisting
of sets of four gears, on two shafts (Figure 4-10) These
shafts are fixed in place and do not rotate. Each set of four
gears (A, B, C, and D) either provides a speed reduction
with all four gears transmitting power, or no speed
reduction, with power bypassing the reduction gears
through a spring clutch that links gears A and D on the
primary shaft. Gear D IS mechanically part of Gear, A on the
next set, so power IS directly transmitted to the next set of
gears

When direct drive is desired, the associated solenoid

4-49
is energized, withdrawing the plunger from the clutch
pawls. The clutch then engages, coupling gears A and D
The spring clutch between gears B and C automatically

disengages since gear C, being smaller than gear B, rotates
faster when gears A and D are in direct drive

Figure 4-9. Recorder Power Control Circuits, Simplified Diagram

Figure 4-9.

TM11-6625-2752-14&P

Section IV- Principles of Operations

Models 7758A, 7418A

07158-1

Recorder Power Control Circuits, Simplified Diagram

Figure 4-9.

Figure 4-10. Chart Drive Gears

4-9

TM11-6625-2752-14&P

Section IV-Principles of Operation

Models 7758A, 7418A

07758-1

4-10

TM11-6625-2752-14&P
Section IV-Principles of Operation

Models 7758A, 7418A
07758-1

Figure 4-11. Gearbox Power Flow

4-10

4-50.

4-51.

TM11-6625-2752-14&P

Section IV-Principles of Operation

Models 7758A, 7418A

07758-1

4-52.

4-53.

Figure 4-12. Paper Feed Path

4-11

TM11-6625-2752-14&P

Section IV-Principles of Operation

Models 7758A, 7418A

07758-1

4-12

Figure 4-13. Recorder Power Supply and Regulator Circuits, Simplified Diagram

TM11-6625-2752-14&P
Section IV-Principles of Operation

Models 7758A, 7418A

07758-1

4-54.

4-55.

4-56.
4-57.

4-58.

4-59.

4-62.

4-63.

4-64.

4-60.

4-61.

4-65.

4-66.

4-67.

4-13

TM11-6625-2752-14&P
Section IV-Principles of Operation
Models 7758A, 7418A

07758-1

4-68.

4-69.

4-70.

4-91. To switch the current, differential input circuit

is controlled by two things, to turn the current

on at the appropriate time. The height of the
output voltage pulse, and thus the quantity of current, is
determined by the heat control voltage level. It is limited
by the point at which the main +l5V supply starts (or

stops) drawing current. The differential circuit switches

series regulator Q18, Q12 to pulse the marker heat current

as drown by the shaded areas in Figure 4-14. This provides
a pulse on the steep leading and trailing edges of the main

waveform, when the capacitive supply is not drawing

current. Board exchange instead of troubleshooting is
recommended if this circuit IS found to be inoperative.

4-14

Figure 4-14. Marker Heat Driver Output Current Waveforms

5-1.

5-2.

5-3.

5-4.

MAINTENANCE

Paragraph 5-5

Paragraph 5-10

Paragraph 5-20

Paragraph 5-22
Paragraph 5-38.

SECTION V

5-5.

5-6.

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

Table 5-1. Recommended Test Equipment

To be made, see Figures 5-3, 5-4.

5-1

TM11-6625-2752-14&P

Section V-Maintenance
Models 7758A, 7418A

07758-1

Table 5-2. Lubricants and Solvents Required

5-14. Operate the Recorder in all speed
perform the operating procedure, using all controls listed in
Figure 3-l.

5-15. The following steps check operation of the
Recorder:

a.

Recorder slides..

smoothly and that they lock in the full open position
(Figure 2-1).

5-7. To facilitate by checking the Driver Amplifiers and the

Regulator/Oscillator Assembly, extender boards (Table 5-1)

are available as accessories.

Paper tension: Run the Recorder at the highest
speed and inspect paper travel over the platen at the paper
table (see Figure 4-12). The paper should travel snugly over
the paper table. Adjust the paper brake if necessary, or

5-8.

Variable Line Voltage.

5-9.

During the performance

checks, the Recorder should
be connected to the power source through an adjustable
autotransformer so the line voltage can be changed 10%

from the nominal 115 or 230 Vac.

CAUTION

TO AVOID DAMAGE, REMOVE POWER FROM THE
RECORDER BEFORE DISCONNECTING ASSEMBLIES
OR COMPONENTS. NEVER TlP RECORDER ONTO
REAR PANEL AREA, TO AVOID DAMAGING THE
TRANSFER PC ASSEMBLY AND DRIVER

AMPLIFIERS.

5-10. PREVENTIVE MAINTENANCE.

5-11. Preventive maintenance is recommended every six
months or 1000 hours of operation, and new procedures
may be used as an aid for minor repairs, adjustments and
troubleshootmg.

5-12.

Operational Checks and Inspection.

5-13. Switch Recorder power OFF Inspect the Recorder
for evidence of mechanical or electrical overload, dents,
rust, and corrosion. Check that all components are securely
mounted, including the cable connectors Also check ex-

ternal connecting cables for strain, breaks, and frayed

insulation. If the Recorder is installed in a cart or cabinet,

the cables should be free when the Recorder is moved in

and out.

replace the brake felt (Paragraph 5-28).

C.

Paper tracking Run the Recorder at 25 mm/sec for

5 sheets. Paper should follow the right table guide without

weaving or damaging the edge of the paper. A static trace

position should not vary-more than 0.5 mm from any
reference grid line, after 6 to 12 sheets have passed and
tracking has settled down. Check several more sheets at 200

mm/second. For tracking adjustments, see paragraph 5-26.

d.

Galvanometer to Paper Parallax

will have the same time reference with respect to the paper,

all stylus tips must fall on the same time reference line of

the paper, 0.25 division. To check parallax, apply power
to the Recorder, and set to STANDBY mode. With finger
pressure, gently move the stylus off center full scale, in the
positive and negative directions The trace over the width of
each channel should be within 0. 25 mm of the reference
grid line. If not, see Paragraph 5-33 to adjust stylus

parallax. All 8 channels should be referenced to the same
grid line, that is, all traces should end at the same point
when the Recorder stops If not, see Paragraph 5-34

channel time synchronization procedure, which is used to
adjust galvanometer parallax, that is, to line up the
galvanometers in a straight line so the style will fall on the
same time line.

Signal Stylus.

e
and condition. If a stylus is bent or twisted, replace it
(Paragraph 5-35).

Stylus

f.
the trace lacks definition, but when pressure is too heavy,
friction causes noticeable non-linearity and hystereais
Refer to Paragraph 5-31 for stylus pressure adjustments.

WARNING

Check that the slides roll in and out

each signal stylus for cleanliness

Pressure

When stylus pressure is too light,

So that all channels

5-2

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

SIGNAL STYLUS
ADJUSTMENTS.

MARKER STYLUS
ADJUSTMENTS, SEE

SEE FIGURE 5-9 FlGURE 5-21

Figure 5-1.

Recorder Test and Adjustment Points

5-3

TM11-6625-2752-14&P

Section V-Principles of Operation

Models 7758A, 7418A

07758-1

d.

Carefully clean the writing and marker stylus with

Chlorothene. Do not use steel wool or abrasive cleaning

compounds. Be careful not to bend the styli vertically , they

are easily distorted in the vertical direction.

5-18. Lubrication.

5-19. Minor lubrication should be performed during pre­ventive maintenance Major lubncation (minor lubrication
plus gearbox) is done at overhaul and at regular intervals of

12 months or 2000 hours operation, if used mostly in the
upper half of the speed range. If the Recorder is used
mostly for low speed operation, more clutches are engaged

and

more reduction gears are used. Thus, a more

frequent

lubrication may be required, typically every 6 months or

1000 hours. To help assure uninterrupted service if an
extended period of recording is anticipated, overhaul and
lubricate the Recorder before placing it in service

Lubri­cants are listed in Table 5-2, lubrication points are shown in
Figure 5-2.

5-20. ELECTRICAL

5-21.

5-16. Cleaning

To check out the Model 8848A Power Supply, make

the cable shown in Figure 5-3, and follow the steps in Table
5-17. Depending on environmental conditions, cleaning
may be required at much shorter intervals than the regular

maintenance intervals:

Unplug Recorder power cord. Remove chart paper.

a.

Expose top

and rear of

Recorder, and remove dust with a

vacuum hose.

b.

Clean Recorder

and

Preamplifier front panels and
controls with a soft, lint-free cloth or a wax-impregnated
polishing cloth.

CAUTION

IF A SOLVENT IS

NECESSARY TO CLEAN THE
PANEL, USE ONLY CHLOROTHENE OR ETHYL ALCO­HOL. OTHER SOLVENTS, SUCH AS ACETONE OR
ISO-PROPYL ALCOHOL, MAY REMOVE PANEL PAINT

5-3 To check out the 7758A or 7418A Recorder, follow

the procedure in Table 5-4 To facilitate checking, make the

cable shown in Figure 5-4 To support the Driver Amplifier
or Regulator, Oscillator for testing, fasten the PC board test
support shown in Figure 54 onto the rear of the heat sink

with a No 10 nut (Figure 5-5)

5-22. ADJUSTMENTS

5-23. Mechanical adjustments are confined to the
drive and galvanometer assemblies. Paper drive minor repair
and troubleshooting information is presented in Table 5-5

If necessary, galvanometer superficial parts may be replaced
only to the extent indicated in the Replaceable Parts List
Do not attempt to disassemble the Galvanometer, but
return it to Hewlett-Packard for service.

OR MARKINGS. IF THE PANEL MUST BE MARKED,

FOR INSTANCE WITH CHANNEL IDENTITY, USE

5-24. Paper Drive Adjustment

ONLY CHINA MARKING WAX CRAYON, OR COLOR­CODED EMBOSSING TAPE. DO NOT USE FELT.
NYLON, OR BAMBOO-TIPPED MARKERS ON THE
INSTRUMENT PANEL OR THE MARKING MAY DIS­COLOR THE PANEL PAINT PERMANENTLY.

5-25. The rubber drive roller pulls paper over the

table, where it is aligned by the paper guide The pa
kept snug on the table by the paper brake felt, which
presses the paper against the back of the platen The paper
is kept from shipping on the drive roller by two spring-

Pull the paper table out at the bottom (Figure 3-2,

C.

Step I). Clean the surface of the paper table with
Chlorothene solvent.
metal pressure rollers with Chlorothene.
front

of

the

Under

bottom of the table, clean the

At

the bottom

Drive

Unit, clean the rubber drive roller with

Chlorothene (Figures 5-13, 5-15).

loaded pressure rollers To set up the Recorder so that

run on the channel centerlines, the paper is first adjusted to
run at the right edge of the paper guide, which is fixed in
location. Then the stylus position for each channel is
adjusted (see Table 5-4), the mechanical limit stops
adjusted, and the electrical limiters are adjusted

CHECKS.

AND

MINOR

REPAIRS.

5-4

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

Figure 5-2. Recorder Lubrication Points (Typical)

5-5

TM11-6625-2752-14&P

Section V-Maintenance
Models 7758A, 7418A
07758-1

Table 5-3. Performance Checks Model 8548A Power Supply

5-6

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

Figure 5-3. Preamplifier Power Supply 8948A, Power Test Points, Test Cable

5-7

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

CONNECTOR 5080-4650 KIT

(SAME AS REMOTE, FIGURE 2-7)

5-8

PC BOARD TEST FIXTURE 07754-00800

Figure 5-4. Test Cable and Fixture

Figure 5-5. Driver or Regulator Board Test Setup

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

Table 5-4. Electrical Performance Checks and Adjustments for 7758A/7418A Recorder

5-9

TM11-6625-2752-14&P
Section V-Maintenace

Models 7758A, 7418A

07758-1

Table 5-4. Electrical Performance Checks and Adjustments for 7758A/7418A Recorder (Continued)

5-10

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

Figure 5-5A. Removal and Disassembly

5-10.1

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

Figure 5-6. Regulator/Oscillator Board Test Points

5-11

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

Table 5-4. Electrical Performance Checks and Adjustments (cont.)

5-12

TM11-6625-2752-14&P

Section V-Principles of Operation

Models 7758A, 7418A

07758-1

Table 5-4. Electrical Performance Checks and Adjustment (cont.)

beyond left

line

of chart.

b.

Adjust Channel LIMIT R control (R9 Figure
to limit stylus travel to 1.5 divisions beyond
line of chart.

C.

Repeat Steps a and b for remaining channels

d.

Turn amplitude control of Function Generator
cow so stylus travel stops at last grid line of chart top
and bottom. Triangular waveform must not limit at
either top or bottom of chart.

e.

Set MODE switch to STDBY.

2. D

SEC speed.

square wave.

to produce a 20 division deflection on Recorder.

Figure 5-7 inset) so overshoot on chart IS between 0.5

a.

Set Function Generator frequency to 1 Hz, and

and 0.8 division.

output to triangular waveform. set amplitude control
to 10.0 volts p-p.

b. Set Recorder MODE switch to RUN.

(c. Adust LIMIT controls and (R() R13, Figure

3.

5-7 inset) on each Driver Amplifier board fully

clockwise. to cause all styli to travel at least 1.5

diviations beyond chart channel edge, for channels
next to markers, and 3 divisions on all other channels.

d.

Adjust Channel 1 right and left bumpers to

limit travel of stylus to 2.5 divisions beyond top and

for a 10 division stylus deflection.

bottom line of chart channel.

e.

Repeat Step d for remaining chart

NOTE: Stylus travel beyond the edge of the

grid must not interfere with any adjacent channel

stylus or marker stylus when syli are at maximum

to 100 Hz and back to 10 Hz three times before
reading deflection on chart.

on chart.

excursion toward each other.

Push Recorder SPEED button for 100 MM/

b. Adjust Function Generator output to 1 Hz

C.

Set Recorder MODE switch RUN.

d.

Adjust Function Generator amplitude control

e.

Adjust Channel I DAMPING control (R30,

f. Set MODE switch to STDBY.

Repeat steps b to f for remaining channels.

g.

a.

Set Function Generator to 10 Hz sine wave.

b.

Push Recorder SPEED button for 5 MM/SEC.

Set MODE switch to RUN.

C.
d. Adjust Function Generator amplitude control

e.

Switch Function Generator output from 10 Hz

f.

Stylus must deflect 7.07 divisions (3 dB down)

Set MODE switch to STDBY.

g.

5-13

TM11-6625-2752-14&P

Section V- Maintenance

Models 7758A, 7418A

07758-1

5-14

Figure 5-7. Amplifier Board Test Points

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

Table 5-4. Electrical Performance Checks and Adjustments (cont.)

07758-1

5-15

TM11-6625-2752-14&P

Section V- Maintenance
Models 7758A, 7418A
07758-1

Table 5-4. Electrical Performance Checks and Adjustment (cont.)

5-16

Table 5-4. Electrical Performance Checks and 'Adjustments
(cont.)

5-26.

TM11-6625-2752-14&P

Section V-Maintenance

Models 7758A, 7418A

07758-1

5-28.

5-27.

5-29.

5-30.

5-31.

5-17

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

WARNING

CAUTION

5-32.

CAUTION

5-18

Figure 5-8. Paper Tension Adjustment

TM11-6625-2752-14&P

5-19

Section V - Maintenance

Models 7758A, 7418A

07758-1

5-33.

5-34.

Figure 5-9. Stylus Adjustments

5-35.

CAUTION

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

5-36.

5-37.

Figure 5-10. Channel Time Synchronization Adjustment

5-38.

5-39.

5-40.

5-41.

5-20

Section V

Maintenance

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

Figure 5-11. Stylus Removal and Replacement

5-21

TM11-6625-2752-14&P

Section V - -Maintenance
Models 7758A, 7418A
07758-1

5-42.

5-22

Figure 5-12. Stylus Lapping Procedure

5-43.

5-44.

WARNING

CAUTION

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

Figure 5-13. Drive Unit and Galvanometer Mounting Screws

WARNING

WARNING

5-45

5-23

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A
07758-1

5-46.
5-47.

5-48.

5-49.

Figure 5-14. Drive Unit Removal and Replacement

5-50.

Remove the screw and standoff standoff holding the chain
guard at the drive roller sprocket, and pivot the guard down
and to the left.

(Loosen the drive roller sprocket setscrew (No. 8

d.

spline wrench). Remove sprocket and 0510-1051 shaft key
being careful not to lose the key . Count the number of
shim washers, if any are required for chain alignment.

5-24

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

Figure 5-15. Paper Table Removal, Table Link and Drive Roller Disassembly

5-25

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A
07758-1

5-26

Figure 5- 16. Gearbox Removal

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

end

While listening as closely as is safely practical

gearbox in all chart speeds (selected from the Recorder
front panel), and listen for chattering of clutch springs,
which indicates a need for lubrication or for replacement of
a clutch spring or of a gear, if the gear hub
obviously faulty parts, such as a clutch spring jamming the
gearbox, during overhaul.

5-54. GEARBOX REMOVAL.

Loosen drive unit side plate screws noted in Figure

e.

5-51. Spring the right side plate outward u
pressure only, and pull the right end of the drive roller and
table link forward to remove them. Then work the

left

of the drive roller and its shaft out of the bearing in the left
side plate. The bearing may come out with the roller &aft.
Press the other bearing out of the right side plate.

NOTE

For greater clearance while springing the side plates
yet still maintaining support of the bank of galvanometers,
the two screws holding up galvanometer mount A22MP59
(Figure 6.15) may be temporarily replaced with longer 6-32
x 1 inch screws. Reinstall the original screws

Before reinstalling the bearings, clean them as

f.

of soft wire (Figure 5-16) It will be used in Step e to
suspend the gearbox chain from the top of the side plate

follows.

(1) Wash, but do not soak, the bearings in

Chlorothene solvent.

(2)

0il them with penetrating oil (Table 5-2),

side plate. Remove rear clamp attachment screw from side
plate.

letting it soak into the porous metal, then with No. 10
lubricating oil.

5-52. The gearbox may be removed without taking the
Drive Unit out of the Recorder. A small motor and belt
drive may be provided on the bench for gearbox run-m, or
the gearbox , may be run in after reinstallation, since it is

and slip the MM/SEC drive belt off its pulley. The MM/SEC
motor IS the larger motor.

easily accessible from the top of the recorder.

NOTE.

Gearbox Lubrication Intervals The gearbox should
be lubricated whenever the recorder IS overhauled, in
addition to the normal lubrication at 12 months or 2000

output sprocket with screwdriver as shown. Be sure chain
held up by bent wire over side plate.

hours of operation at varying speeds. Under continued
low-speed operation, the gearbox should be lubricated
every 6 months or 1000 hours. Whenever an extended

period of recording is anticipated, that is. for 30, 60, or 90

recorder, lift gearbox input pulley over belt drive output
pulley, and slip belt off gearbox pulley Be careful not to
bend pulley flanges while twisting gearbox

days continuous duty, a lubrication and inspection before

the recording period will help to assure uninterrupted

service For a list of recommended lubricants, see Table 5-2.

and gearbox together and place on bench Separate belt
drive and gearbox by twisting apart, then lift gearbox input
pulley over belt drive output pulley and slip belt off

5-53. GEARBOX INSPECTION. Before removing the

gearbox pulley

gearbox, take off the top cover and inspect inside for brass
particles from the gears If any are found, move the gears
by hand and look for excessive wear or damage to the gear
teeth.

unfasten two screws D on one side, and slip one bearing
mount (MP6 or MP7) off the shaft

WARNING

from either bearing mount, install a new bearing, and

retighten the setscrew, set with either Glyptal or Loctite.

IS

worn. Replace

a.

Make a wire chain hanger out of a paper clip or piece

b.

Remove cables from clamps on left Unit Housing

C.

Refer to Figure 5-16 and remove
4 screws A from gearbox base plate.
2 screws B from drive belt and pulley assembly
In MM/MIN units, 3 screws C from 60.1 motor
chassis assembly. Catch nuts and insulators from
below.
Note that motor chassis is electrically insulated.

d.

Slightly twist belt drive pulley assembly, as shown,

e.

Release chain by twisting gearbox and lifting it off

f.

(MM/MIN UNITS) Leave belt drive assembly in

(UNITS WITHOUT MM/MIN) Remove belt drive

To remove belts from the belt drive assembly,

g.

h

To replace the belt drive bearings, remove setscrew E

is

1

Re-installation

Generally the reverse of removal,
reinstallation of MM/MIN gearboxes requires that the
MM/MIN motor chassis front screw be tightened before the
two rear screws, to keep the MM/MIN drive belt tight
Reposition cable connector as shown in Figure 5-20 Pull

drive belts hand tight only.

5-27

TM11-6625-2752-14&P
Section V - Maintenance
Models 7758A, 7418A
07758-l

WARNING

TO AVOID SERIOUS SHOCK HAZARD, REINSTALL
MOTOR ELECTRICAL INSULATING PADS AND WASH­ERS REMOVED IN PARAGRAPH 5-544, STEP C.
SHOULDERS SHOULD BE UPWARDS.

5-55. GEARBOX DISASSEMBLY AND LUBRICATION

OVERHAUL). Use the following procedure to disassemble

the gearbox, and to

inspect for clutch wear. The procedure

is Illustrated in Figure 5-17. Note that each gear has, in
addition to one or two toothed discs, one or two hub

sections that fit

inside the

clutch springs. The hub sections

of adjacent gears meet inside the spring, and must fit very
closely or else the spring will wind

down between the hubs,

disabling the gearbox. The shaft end play adjustment,

which follows

this overhaul procedure, is essential. End

play must be adjusted before running the gearbox, to
prevent damage.

NOTE Obtain a

cm), and with a diameter of 5/16 inch (0.8 cm)

in order after cleaning but before lubrication, at

parts

wooden dowel rod about a foot long (30

to keep

which time they will be put back on the gearbox shaft.

a.

Remove the gearbox top cover, and the flat mount-

ing plate (four screws each).

Remove four screws holding the curved bottom

b
cover (solenoid plate). This should leave only the gears,
shafts, and gearbox sideplates.

c.

Remove the two round-head, slotted Nylock

screws holding the output sprocket and input pulley. Keep

the same number of shun washers on each

screw. Detach

the side plates from each other, leaving one shaft on each
side plate Do not remove the
orientation and position of each component on

shaft end hex nuts. Note the

each of the

shafts.

NOTE If gears are to be replaced or components

lubricated, remove only one shaft at a time
order of the gears on the shaft for best

d

While holding one end plate in

to preserve the

wear characteristics.

each hand, pull

out
the primary shaft from the gears (Figure 5-17). Lift the
entire primary gear tram out as one unit. Note the
orientation and position of each component.

Remove the parts from the gear tram one at a time,

e.
and clean each part by brushing it with Chlorothene
solvent Wipe plastic clutch sleeves with Chlorothene­dampened cloth.

CAUTION

f. Inspect each part for damage and wear before
lubrication, To check for hub
hub surface and check for grooves.

g.

Arrange each part in order on dowel for proper

position during reassembly on the shaft during lubrication.
5-56. GEARBOX LUBRICATION. After all gears are

arranged on the dowel, lubricate as follows:

a

Gil each gear bearing with Mystery Oil (Table 5-2) to

soften gum residues.

b. Primary Shaft Lubrication.

Grease

shown in Figure 5-18 using the following steps to grease
each assembly:

(1) Work grease into coils of each spring, and

install on one half of clutch hub. Note

be in proper position (Figure 5-18).

(2) Slip plastic clutch sleeve (with ratchet teeth)

over spring; mate sleeve cutout to spring tab.

(3)

hub into assembled clutch and spring. As a test

wear, clutch hub should “grab” spring when twisted in one

direction, and
together

slips

to be sure the hub faces are in contact. If clutch

in both

worn spring.

NOTE:

Do not over-grease clutches, which may cause them

to slip.

C.

When all gears are reassembled onto shaft, slip shaft

out as shown in Figure 5-17, leaving gear tram as

Gil shaft lightly
excess oil Note that shaft does not rotate. Steel washer on
shaft end must be properly positioned.

d.

Remove secondary shaft in same way as primary
shaft (Paragraph 5-55), clean gears and spring clutches
without submerging them in solvent, and arrange them in

order (Figure 5-18). 0il with Mystery 0il (Table 5-2).

e.

Secondary Shaft Lubrication

Grease each secondary clutch and gear assembly as
shown in Figure 5-18. Inspect each part for damage or wear
before greasing, as noted in illustration Drag a fingernail
across hub surface to inspect for wear grooves Use
following steps to grease springs and hubs

(1) Work grease into the coils of each clutch spring

(2) Grease each clutch hub

(3) Twist spring and hub together Remove excess
grease. Test clutch hub by twisting in both directions Press

the hubs together to be sure the hub faces are in contact
Hub should “‘grab” when twisted one way and slip when
twisted the other way

wear;

drag a fingermail across

each

primary clutch and gear assembly as

that spring tab must

Coat mating gear hub with grease and twist

of

clutch

slip when

twisted in other. Press the hubs

directions, replace hub and attached gear, or

one

unit.

with No

10 oil (Table 5-2), and remove

5-28

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

0758-1

Figure 5-17. Gearbox Disassembly

5-29

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

5-30

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

5-30

Figure 5-18. Clutch Lubrication

TM11-6625-2752-14&P

5-59.

Section V - Maintenance

Models 7758A,

7418A

07758-1

Figure 5-19. Gearbox Shaft End Play Adjustment

f.

When all gears are reassembled onto shaft, slip shaft

out, leaving gear tram as one unit (Figure 5-17). 0il shaft

lightly (do not use grease).

Reassemble both shafts with the side plates and

g.

tighten Nylock shaft-end Screws so gears will just rotate
by hand.

Grease gearbox gear teeth with HP 6040-0222 gear

h.

grease

Replace rounded bottom cover (four screws, Figure

1.
5-17); leave screws loose and install mounting plate. Then
tighten them.

CAUTION

5-57. GE

The end

the gearbox top cover removed, as shown in Figure 5-19.

Tighten the shaft end screw snug, then back off
while using a feeler gage at the side plate to obtain 0.007
inch (0.178 mm) end play.

OX

SHAFT END PLAY ADJUSTMENT.

play

of both gearbox shafts must be adjusted with

CAUTlON

SHAFT, NOT JUST TO THE SPACER WASHER. TOO
TIGHT ADJUSTMENT WILL CAUSE BURNOUT. END
PLAY MUST BE NO MORE THAN 0.007 INCH (0.178
MM), OTHERWISE CLUTCH SPRINGS WILL WIND
DOWN BETWEEN THE HUBS AND DISABLE THE
GEARBOX.

5-58. SOLENOID ADJUSTMENT. Position the gearbox
on top of the Recorder top cover, which has been slid back
onto the driver amplifiers, as shown in Figure 5-20. Plug the
speed control cable into the rear of the front panel Control
Switch PC Board, with the blank pm to the MM/SEC motor
side of the recorder, as shown (left as you face the rear
panel). Then select the highest MM/SEC chart speed, apply
power to the Recorder, and select STANDBY mode. With
all the solenoids thus energized, adjust the clearance
between the solenoid pawls and the clutch sleeves with the
typical adjustment screw shown. Place an 0.01 inch (.254
mm) feeler gauge between the paw1 and sleeve for each
adjustment.

5-60.

Position the input pulley over the belt drive output

pulley, and slip the belt on. Placing the gearbox into

position on the motor chassis, twist the output chain onto

the output sprocket. Adjust the input and output drive
tension by holding (twisting) the gearbox hand-tight against

the resistance of its input belt and output chain, while

5-31

TM11-6623-2752-14&P

Section V - Maintenance

Models

7758A,

7418A

07758-1

Table 5-5. Paper Drive Troubleshooting

TROUBLE

BAD PAPER TRACKING (paper
moves to one side or climbs paper

guide flange)

PAPER WEAVES FROM SIDE
TO SIDE

PAPER TEARS AT FOLD

PAPER JAMS IN PRESSURE

ROLLERS

IRREGULAR PAPER SPEED

INCORRECT BUT STEADY
PAPER SPEED

PROBABLE CAUSE

Uneven tension on pressure rollers
Brake pressure springs came off
Worn brake felt or bent paper guide
Paper table unevenly adjusted

Slick or duty paper brake felt or
drive roller

Excessive brake pressure (should

cause 2-3 lb pull)
One pressure roller spring is weaker

or misadjusted

Slick or duty drive roller, loose
pressure roller adjustment, or
excessive brake tension

Gearbox clutch shipping or
grabbing

Speed control solenoid malfunction,
coi1 or lead open, felt paper brake
misadjusted, or incorrect paper
loading

SOLUTION

Provide even tension on paper.

Reseat springs.
Replace felt or guide.
Adjust table comers.

Clean drive roller and pressure
rollers, or replace brake felt.

Adjust both screws evenly cow for
less tension.

Balance tension (NOTE.
goes to side with tighter
ment) or replace both springs.

Clean drive roller, or adjust pres­sure roller or felt brake.

Adjust clutch solenoid. D
dean clutch, re-lube with
twist to check for wear.

Make sure paper is not be
pressure rollers Adjust brake. Check

solenoid circuits, also gearbox for
Jammed clutch actuators, pawls,
clutches

NO PAPER DRIVE

NO SIGNAL ON PAPER

5-32

Defective drive motor, broken
timing belt or drive roller chain,
drive roller sprocket key or setscrew
missing Motor power open circuit
or blown fuse

Drive amplifier. oscillator, heat, or
galvanometer problem
CAUTION GALVANOMETER IS

Visually check for belt, chain,

roller motion, Check motor fuse, and

motor cable from bottom of power

supply Test connections to motor

chassis terminal blocks.

Refer to Table 5-4 for driver

troubleshooting. See text for stylus

and galvanometer adjustments

NOT FIELD REPAIRABLE RE­PLACE ONLY EXTERNAL PARTS
SHOWN IN FIGURE 6-14

TM11-6625-2752-14&P

Section V - Maintenance

Models 7758A, 7418A

07758-1

Figure 5-20. Gearbox Solenoid Adjustment

5-33

TM11-6625-2752-14&P
Section V - Maintenance

Models 7758A, 7418A

07758-1

Figure 5-21. Marker Assembly Adjustment and Removal

tightening the mounting plate screws. Re-attach the sole-

noid control cable. If the input belt tends to “walk” off the

that all solenoids are operating properly, retracting the

pawls fully, and not hanging up on the clutch sleeves.

pulley, the Gear Drive Assembly probably needs reposition­ing in its four elongated holes in the Drive Unit side plates.
The Gear Drive Assembly is the main motor chassis(see
Section VI). Then reposition the gearbox to bring the input
pulley back in line with the belt.

5-63. The marker assemblies are attached between the
galvanometers. To adjust the stylus position, first set the

writing stylus bumpers (Table 5-4) and then loosen the

attachment screw (Figure 5-21). Position the marker stylus

5-61. GEARBOX RUN-IN.. To disperse excess lubricant
and test the gearbox, give it a test run after reinstallation.
First, run the gearbox at lowest speed (selected at the
recorder control panel).Excess Mystery oil, applied in the
procedure in Paragraph 5-56, will run from
gears, carrying with it dissolved gum and grease residue.
Stop the drive motor and wipe away this residue frequent-

of

ly. After 15 minutes

running run through a complete set
of gear changes at the front panel of the recorder while
inspecting the action of the gearbox (top cover removed).

All clutches should operate properly and the gears should

rotate smoothly. Stop the drive motor and place three

No. for drops of No. 10 oil (Table 5-2) between the

gears to lubricate the gear bearing (a typical point is

indicated in Figure 5-20). Run the gearbox at its lowest

speed for several minutes to ensure that the oil will seep

down into the gear bearings and be stored for future

so that it does not hit either bumper during its excursion,
and tighten the attachment screw. Unfasten this screw to
remove the stylus, and also remove the heat lead and its

attachment screw. To increase stylus pressure, move stylus

toward paper by loosening the screw in the slotted hole just
above mounting screw for stylus. To remove the marker
coil, unfasten the marker leads (Figure 5-l) by unplugging a
small cable, and unfasten the two marker mounting screws
shown in Figure 5-21. Two stylus heat leads also must be
disconnected in the marker frame area.

5-62.
heat leads from standoffs on galvanometer and remove
Pozidriv screw from maker mounting bracket (Figure

5-21). Install the new stylus on the mounting bracket with

the screw, and reinstall the heat leads. Reset stylus pressure
with each new installation, and readjust the marker

amplitude stop, if necessary.

If the stylus only, less coil, must be replaced, remove

5-34

SECTION VI

6-1.

6-2. This section contains schematics, figures and

information for identifying, locating and ordering replace-

and 6-3 list parts in Order of the ref-

designations (circuit references) and provide the

information for each item.

a. Description 0f the part (see list of abbreviations on the

following page).

b. Typical manufacturer of the part using a five-digit

See the code list of manufacturers in Table 6-2.

c. Manufacturer's part number.

d. Total quantity used in the instrument (TQ column).

NOTE: Identification of the attaching parts (screws, nuts,

washers, rivets, etc.) used to secure a component in place is

entered immediately after the listing of the respective

component in Table 6-1 or 6-3.

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-l

6-4. REFERENCE DESIGNATIONS

6-5. Tables 6-1 and 6-3 are baaed On an alpha-numerical

method of listing the end item, assemblies, subassemblies

and circuit components. These items are defined as

follows:

a. AN END ITEM instrument with all the supplied

accessories. The END ITEM is made up of assemblies to aid

in the location of parts.

The complete reference designation is read as the first
resistor (Rl) of the second subassembly (A2) of the first
assembly (Al).

6-7. Partial reference designation are normally used on

equipment and illustrations. The partial reference

designation consists of the component alpha designation

and numeric designation. The complete reference

designations are obtained by placing the proper assembly

the partial reference designations.

that can be purchased have part numbers in the part
number columns; that cannot be purchased have the

word “Reference” in the column.

6-8. In this section, these assembly prefix numbers are
usually shown with each reference designation, in the title

of the figure or at the bottom of the illustration block
following the notation “REF DESIG PREFIX”. The com­plete reference designation should be used to easily locate
a part and the description in the Parts List.

capacitor, R1 resistor etc). These parts are prefaced by the

assembly number (A1CI, A1C2, A1R1, A2R2,

etc.) to

indicate thee assembly On which the part is located.

6-9. For example, to determine the value and the part

number of resistor R6 in the A2 assembly (A2R6), locate

the A2 group listing (the second group) in the parts list.

6-6. Examples of the alpha-numeric
used to identify assemblies , sub

components follow:

numbering method

assemblies and circuit

Then refer to the R (resistor) designations in the group and

find R6. The value and the part number are in the columns

adjacent to the description.

6-1

TM11-6625-2752-l4&P

6-10.

Section VI - Replaceable Parts
Models 7758A, 7418A

07758-l

6-11. To order a replacement part, address order or inquiry
to the local Hewlett-Packard Sales/Service Office (see list of’
addresses at the rear of the manual) and supply HP part
number of the item from Table 6-1 or 6-3.

6-12. To order a part not listed in the table, provide the

following information:

6-13.

6-2

Table 6-1. Replaceable Parts

TM11-6625-2752-14&P
Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

Figure 6-1. Model 7758A, or 7418A Thermal Tip Recorder Assemblies

6-3

TM11-6625-2752-14&P

Section VI - Replaceable Parts
Models 7758A, 7418A
07758-1

07750-60010

07750-60011

07750-00062

07758-00064

07758-00061

07756-00063

07758-200010

2510-0123

07758-20010

2510-0123

07754-008070
2516-0123

2560-0086

07754-00070

2510-0123

2580-0086

07758-00320

1490-0960

2510-0123

Table 6-1. Replaceable Parts (continued)

6-4

07758-60020

07758-60021

2530-0084

2580-0006

07758-00181
07758-00182

0370-1005

0370-1005
0370-1005

0370-1005

0370-1005
0370-1005

0370-1005

0370-1005
0370-1005
0370-1005

07758-00190

0590-0199

2200-0166

07758-10360

See introduction to this section for ordering Information

2200-0166

07758-20360

2200-0166

07758-20360

2200-0166

07758-20360

2200-0166
07750-20360
2200-0166

07758-20360

2200-0166

07758-20360
2200-0166

07758-20360
2200-0166

0370-2051

0370-2051

0370-2051

0370-2051
0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

0370-2051

6960-0006

7120-1254
07758-60150

07758-60170

Table 6-1. Replaceable Parts (continued)

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

07758-60270

2200-0183
0360-1730
0150-0052
0150-0052

0150-0052
0150-0052
0150-0052
1901-0033

1901-0033

1901-0033
1901-0033
1901-0033
1901-0033
1901-0033

1901-0033
1901-0033
1901-0033

1901-0033

1901-0033
1200-0151

1200-0151

1200-0151

1200-0151

1200-0151
1200-0151

1200-0151
1010-0032

0683-2705

0686-1865

0683-1525
0683-4715
0683-2715
0683-1015

0683-2705

See introduction to this section for ordering information

6-5

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A
07758-1

0683-2705
0683-2705
0683-2705

0683-2705

0683-3315

0683-1815

2100-2031

2100-2031
2100-2031
2100-2031

2100-2031
2100-2031
2100-2031
2100-2031
2100-2031

2100-2031
2100-2031
2100-2031
2100-2031
2100-2031

2100-2031
2100-2031

3101-1289

07758-00270

07758-68260

2200-0103

2190-0027

2950-0071

1251-1968

2100-2853

2100-2853

2100-2853

2100-2853

2100-2853

2100-2853

2100-2853

2100-2853

07758-00260

Table 6-1. Replaceable Parts (continued)

6-6

07758-60150
08821-40011
03821-40012

2200-0147
2340-0001

1251-1190

1251-1190

07758-60170
08821-40011
08821-40012

2200-0147

2340-0001

07758-08280

1251-1190

07758-60030

2530-0004
2580-0006
0180-1873

0180-1873

See introduction to this section for ordering information

0180-2529

0180-0052
3185-0032

1901-0525
2510-0145

2580-0084
1901-0525

2530-0145

2580-0806

2110-0014
2110-0087

2110-0030
2110-0014

2110-0030
3110-0023

2110-0381

2110-0303
8120-0951

1251-2995
0490-0424

07750-59620

2650-0051
2680-0110

07758-00560
07750-00010

07750-00480

2200-0185

07758-00550

07750-08030

2200-0105

0180-0078
2510-0045
2580-0006

0180-0075
2510-0045
2500-0084

0160-2149

2350-0197

2420-0886
7120-0684
7124-1928
07758-06050
2368-8115
7124-1605

1251-0333

1251-1005

1251-1086

1251-1292

1251-1694

0683-2735

0686-1515

0686-2225
3101-1395
9100-2373

0590-0304
5060-1188

077750-60190

07750-60200
1400-0085

1400-0035
1400-0085
1400-0085
1400-0085

1200-0727

0361-0346

07750-60250

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

Table 6-1. Replaceable Parts (continued)

0590-0199
2200-0111
8168-0153

6-7

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

0160-0153

0160-0153

0160-0153

0160-0153

0160-0161

1251-0962
2200-0113
2340-0001

1251-2205

1251-1962

2200-0113

2340-0001
1291-2205

1251-1962

2200-0113

2340-0001
1251-2295
1251-1962
2200-0113

2340-0001

1251-2205

1251-1962

2200-0113

2340-0001

1251-2205
1251-1962

2200-0113
2340-0001
1251-2205

1251-1962

2200-0113
2340-0001
1251-2205
1251-1962

2200-0113

2340-0001

1251-2205

1251-1962

2200-0113
2340-0081

1251-2205

1251-1626

07758-08250
0403-0062

0360-1730

07758-60190

1251-1295

1251-1292
1251-1679

1251-1291

1251-1682

1251-2745
1251-1696

1251-0190

07758-60200

1251-1682

1251-2744

1400-0249

1251-1694

1251-0198

Table 6-1. Replaceable Parts (continued)

6-8

07754-60170

2680-0157

2190-0759

2190-0780
0180-0186

0180-0196

0160-0154

0160-0165

0160-0165

0160-0165

0160-0207

1901-0033

1901-0033

1902-3182

1902-3182

1901-0033
2500-0001

2680-0157
07754-20340
2190-0759

2190-0780
2360-0119

1853-0066

1854-0071

1853-0066

1854-0039

1200-0181

1853-0066

0853-0223
0340-0464

2190-0007

2360-0201

2500-0001
1853-0045
1200-0181

1854-0071

1854-0063

0340-0464

2190-0007

2360-0201
2500-0001

1854-0409
1853-0066

1854-0071
1854-0063

0046-0464
2150-0007

2360-0201

2500-0001

0683-1035

0698-6909

0757-0452
0683-6835

0098-6909

0683-1055

0698-5143

0683-1035

2100-2464

0698-3134

0683-1035

0690-3136
2100-2464
0683-1035

0698-7382

0083-5635

0683-1515

0686-5605

0683-1015

0811-2619

0761-0026

0686-2715

0686-1525

0686-1825
0686-5685
0683-1515

0683-1015

0811-1732

0683-2235

2100-2464

0757-0123

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

Table 6-1. Replaceable Parts (continued)

6-9

TM11-6625-2752-14&P
Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

0683-2735

0683-1035

0683-1025

0698-6909
0683-1065

0757-0869

0683-2235

0683-1015
0683-1515

0686-3915

0683-1015

0811-1732

1820-0283

1820-0203

07754-00170

07754-60170

07754-60170

07754-60170

07754-60170

Table 6-1. Replaceable Parts (continued)

07754-60170

07754-60170

07754-60170

07758-60240

2680-0157
2190-0758
2190-0780

0148-0208
0150-0052
0160-2222

0160-0174

0180-1930
0100-0291

0150-0052

0180-0291

0150-0052
0160-2891

0150-0052
0160-0174
0160-0161

0160-0174

0140-0280

0160-2222

0160-0174

0160-0174

0160-0174

0150-0032

0150-0052

0160-0174

0160-0174
0180-2060

0160-8161

6-10

0180-2060
0160-0174
0180-0097

1901-0033
9140-0210

07754-29340

2853-0300

2853-0300

1854-0071

1854-0071

1854-0063

0340-0464

2190-0088

2360-0201

2500-0081

1854-0063

0340-0464

2190-0008

2360-0201

2500-0001
1854-0071

1853-0300
1854-0022
1200-0181
1854-0071

1854-0071

1854-0063

0340-0464

2190-0008

2360-0201
2500-0001

1854-0071

1854-0071

1853-0300

1853-0300

1853-0045

1200-0181

1853-0045
1853-0300
0698-4002

2100-1703
0698-5353
0683-3325

0698-4002

0683-1515

0683-2725

0811-1732
0686-1515

0757-0442

0757-0442
0698-4002

0698-4002
0683-4725
0811-1732
0683-1025

0698-6273
0698-6866
0698-5323
0683-4725

0683-1245

0683-5625

0683-1505

0761-0025

0683-1825
0811-1202

0683-3335

0683-3335

0683-3335
0683-1035

0683-3335

0683-4715

0683-1245
0683-1825
0683-1825

0683-1245

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

Table 6-1. Replaceable Parts (continued)

6-11

TM111-6625-2752-14&P
Section VI -Replaceable Parts

Models 7758A, 7418A

07758-1

0683-4715

0683-1825

0690-4002

0812-0072

0683-1025

0683-1045

0757-0460

0683-1045

0683-4745

0698-4002

0757-0442

0683-1025

0683-3325

0683-1025

07754-60470

1820-0196

1820-0196

1820-0056
1820-0055

1820-0056

1820-0053

1820-0430

0340-0464

2190-0008

2360-0195

2500-0001

07758-00240

2190-0758

2190-0780

2360-0119

2500-0001

2680-0157

Table 6-1. Replaceable Parts (continued)

07758-60241

1820-0055

07754-60070

2680-0055

07754-28630

3030-0044
07754-08550

07754-20600

07754-20600

07754-00390

2340-0006
2200-0105

3050-0269

07754-60430

0520-0173

0610-0002

07754-00040

2360-0107

2360-0111

07754-08480

07754-60080

07754-00650
1400-0017

0360-1045

2200-0109

2340-0006

2360-0115

2420-0006

1251-0198

6-12

07754-60340
07754-60341

07754-60070

07754-60070

07754-60070

07754-60070

07754-60070

TM11-6625-2752-14&P

Section VI - Replaceable parts

Models 7758A, 7418A

07758-1

Table 6-1. Replaceable Parts (continued)

07754-60070

07754-60070

07758-60100

2510-0053

1460-1370

1460-1370

07758-08300
2200-0101
07758-00300

2200-0101

07758-20260

2200-0167

07758-20350

0570-0171

07758-00040

07758-00160

07758-00420

2200-0181

0510-1051

2190-0833

07758-00101

2200-0105

07758-00102

2200-0105

07758-20280
07758-20270
07758-00170
2200-0103

07758-20230

07758-00120
0590-0199

2200-0168

07758-08450

07758-00450

6-13

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

07758-20190

2200-0101

2200-0105

07758-20190

07758-00440

2200-0101

2200-0105

07758-00440

1460-1324

1460-1324

07758-00090
2360-0115

07758-20190
07758-00090

2360-0115

07754-20190

07758-60070

07758-60070

07758-20101
07758-20102

07758-20080

07758-20070

07758-20290

2360-0115

07758-20290

2360-0115

07758-00150

07758-20050

07754-00730
07754-00730

07754-00730
07754-00730

07758-20020

2360-0183

07758-20020

2360-0183
07758-00071

0590-0126

0361-0347

07758-00072

0361-0547

0590-0126
07754-20500

07754-20500

1500-0357

0590-0199

2200-0107

2680-0059

1430-0460

07750-00530
07750-20370

07750-20370
00758-00140

00758-00140

07758-20090

07758-20090

0361-0383

07758-00460

0361-0383
07758-00110

07758-20030
07758-00130

2360-0183

07758-00430

07758-20220

07758-20220

07758-00570
2510-0049

07758-00580

2510-0049

Table 6-1. Replaceable Parts (continued)

6-14

07758-60110

2680-0055

3140-0412
0570-0945

0160-3118
0660-1289

0360-1279

2360-0211

2420-0086
0360-1289

0360-1279

2360-0211

2420-0006

0340-1289

0360-1279

2360-0211

2420-0006

07758-00080
2360-0115

07758-20320

1500-0097

07758-20250

07758-00490

2510-0045

07758-20340

0520-0130

07758-20340

0520-0120

1500-0030

1500-0337

1410-0816

1410-0816

07758-20380
07758-20150

07758-20200

07758-20170

0160-2963

0160-0934
2740-0003

0160-0934

2740-0003

07758-40010
2200-0141

07758-60390

8120-0962

0362-0167

TM11-6625-2752-14&P

Section VI - Replaceable Parts

Models 7758A, 7418A

07758-1

Table 6-1. Replaceable Parts (continued)

07758-60120
2360-0115

6490-1094
0525-0051

0490-1094

0525-0051

0490-1094

0525-0051

0490-1094

0525-0051

07754-20230

07754-20250

1410-0974

1410-0974

07758-00210

07758-00200
07758-00220

7360-0113

2360-0115
07758-20240

07754-20080
07754-48010

1460-1211
07758-20110

07754-40010

6-15