Valleylab Surgistat II User manual

Service Manual

SurgiStat™ II
Electrosurgical Generator

Preface

This Service Manual and the equipment it describes are for qualified technicians
who maintain the SurgiStat™ II Electrosurgical Generator. Additional user
information is available in the SurgiS tat™ II User’s Guide.

This document covers technical descriptions of the SurgiStat™ II generator,
including its physical appearance, all operator controls and indications,
operational specifications, component functional descriptions (module level),
diagrams of the electronic circuits used, and troubleshooting guidelines (with
chart comparisons).

The SurgiStat™ II was constructed with the highest quality components and was
built in an ISO 9000 registered environment. In the unlikely event that your
generator fails within one year of purchase date, Valleylab will warranty the
product and effect factory repairs. Please refer to Section 8, Repair Policies and
Procedures for what is covered, how long, and how to obtain a Return
Authorization Number.

Caution

Federal (USA) laws restrict this device to sale by or on the order of a physician.

Equipment covered in this manual

SurgiStat™ II Electrosurgical Generator (120 VAC Model) Surg II-20
SurgiStat™ II Electrosurgical Generator (240 VAC Model) Surg II-8
SurgiStat™ II Electrosurgical Generator (100 VAC Model) Surg II-J

Valleylab Part Number 1003626
Effective Date August 2006

Trademark acknowledgements

Valleylab™, ForceTriad™, Force FX™, Force EZ™, Force Argon™, LigaSure™,
LigaSmart
SurgiStat

™

, Smart™, Cool-Tip™, TissuFect™, REM™, RFG-3C™, OptiMumm™,

™

, EDGE™, AccuVac™, PolyHesive™, and Instant Response™ are

trademarks of Valleylab.

Manufactured for

Valleylab
a division of Tyco Healthcare Group LP
Boulder, Colorado 80301-3299 USA

For information call

1-303-530-2300

European representative

Tyco Healthcare UK Ltd.
Gosport, PO13 0AS, UK

Made in USA
Printed in USA

©2006 Valleylab All rights reserved.

ii SurgiStat II Service Manual

Safety Precautions when Operating the Generator

The safe and effective use of electrosurgery depends to a large degree on factors
solely under the control of the operator. There is no substitute for a properly
trained and vigilant medical staff. It is important that they read, understand, and
follow the operating instructions supplied with this electrosurgical equipment.

To promote the safe use of the SurgiStat II electrosurgical generator, please refer
to the User’s Guide for standard operating precautions.

Applicable Safety Standards

CSA C22.2, NO. 601.1-M90
UL60601-1
IEC 60601-2-2 (1998-90) Class 1 Equipment, Type CF
CENELEC EN 60601-1-2
FCC Part 15, Class A
IEC 60601-1 2nd Edition (1988)

Conventions Used in this Guide

Warning

Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.

Caution

Indicates a hazardous situation which, if not avoided, may result in minor or
moderate injury.

Important

Indicates an operating tip or
maintenance suggestion.

Notice

Indicates a hazard that may result in product damage.

SurgiStat II Service Manual iii

Preface ..................................................................................................................................................................... ii

Safety Precautions when Operating the Generator .........................................................................................iii

Applicable Safety Standards................................................................................................................................iii

Section 1. The SurgiStat II Electrosurgical Generator

Functional Description.........................................................................................................................................1-2

Unit Description....................................................................................................................................................1-3

Safety Precautions when Testing the Generator............................................................................................1-3

General Warnings, Cautions, and Notices.............................................................................................1-3

Active Accessories.....................................................................................................................................1-4

Fire/Explosion Hazards.............................................................................................................................1-5

Generator Electric Shock Hazards..........................................................................................................1-5

Servicing......................................................................................................................................................1-6

Cleaning.......................................................................................................................................................1-6

Section 2. Controls, Indicators, and Receptacles

Front Panel............................................................................................................................................................2-2

Controls and Indicators Overview.....................................................................................................................2-3

Cut and Blend Controls.......................................................................................................................................2-4

Coag and Bipolar Controls.................................................................................................................................2-5

Indicators...............................................................................................................................................................2-6

Power Switch and Receptacles.........................................................................................................................2-7

Rear Panel............................................................................................................................................................2-8

Symbols on the Front Panel...............................................................................................................................2-9

Section 3. Technical Specifications

Performance Characteristics..............................................................................................................................3-2

Duty Cycle...................................................................................................................................................3-2

Dimensions and Weight............................................................................................................................3-2

Operating Parameters...............................................................................................................................3-3

Transport and Storage...............................................................................................................................3-3

Audio Volume..............................................................................................................................................3-3

Patient Return Electrode Sensing ...........................................................................................................3-4

Low Frequency (50-60 Hz) Leakage Current........................................................................................3-5

High Frequency (RF) Leakage Current..................................................................................................3-5

Standards and IEC Classifications....................................................................................................................3-5

Class I Equipment (IEC 60601-1)............................................................................................................3-5

Type CF Equipment (IEC 60601-1)/Defibrillator Proof.........................................................................3-5

Electromagnetic Interference...................................................................................................................3-6

Voltage Transients (Emergency Generator Mains Transfer)..............................................................3-6

Electromagnetic Compatibility (IEC 60601-1-2 and IEC 60601-2-2).................................................3-6

Output Power Characteristics..........................................................................................................................3-11

Maximum Output for Bipolar and Monopolar Modes..........................................................................3-11

Output Power Curves........................................................................................................................................3-12

Reference Output Waveforms................................................................................................................3-20

iv SurgiStat II Service Manual

Section 4. Theory Of Operation

Block Diagram ......................................................................................................................................................4-2

Functional Overview of Key Circuits .................................................................................................................4-2

High Voltage DC Supply............................................................................................................................4-2

Low Voltage DC Supplies..........................................................................................................................4-2

DC Supply Check Circuit...........................................................................................................................4-3

Temperature Sensing Circuit....................................................................................................................4-3

Four Request Activation Sensing Circuits..............................................................................................4-3

Speaker Circuit............................................................................................................................................4-3

Patient Return Electrode Sensing Circuit...............................................................................................4-4

RF Amplifier Circuit ....................................................................................................................................4-4

Monopolar Select Circuit...........................................................................................................................4-4

Monopolar/Bipolar Select Relays.............................................................................................................4-4

Controls and Indicators..............................................................................................................................4-5

Digital PWM Circuit .................................................................................................................................... 4-5

System Logic ........................................................................................................................................................4-5

SurgiStat II Control Signal Inputs and Outputs................................................................................................4-6

Section 5. Generator Operation

Inspecting the Generator and Accessories......................................................................................................5-2

Service Personnel Safety....................................................................................................................................5-2

Installation and Placement..................................................................................................................................5-3

Functional (Operational) Checks.......................................................................................................................5-3

How to Set Up and Start the SurgiStat II Unit........................................................................................5-3

How to Check the Patient Return Electrode Alarm Function...............................................................5-4

How to Check the Bipolar Mode (with Footswitch)................................................................................5-4

How to Check the Monopolar Mode (with Footswitch).........................................................................5-4

How to Check the Monopolar Mode (with Handswitch)........................................................................5-5

Operating the Unit................................................................................................................................................5-5

Section 6. Maintenance

Cleaning the Unit..................................................................................................................................................6-2

Performing Periodic Inspection..........................................................................................................................6-2

Replacing Fuses...................................................................................................................................................6-3

Section 7. Troubleshooting

Recommended Equipment for Troubleshooting..............................................................................................7-2

Troubleshooting the SurgiStat II........................................................................................................................7-2

Inspecting the Generator...........................................................................................................................7-2

Inspecting the Receptacles.......................................................................................................................7-3

Understanding Error Codes and Audio Tones ................................................................................................7-4

Correcting Common Problems...........................................................................................................................7-6

SurgiStat II Service Manual v

Section 8. Repair Policy and Procedures

Responsibility of the Manufacturer....................................................................................................................8-2

Returning the Generator for Service.................................................................................................................8-2

Obtain a Return Authorization Number...................................................................................................8-2

Clean the Generator..................................................................................................................................8-3

Ship the Generator.....................................................................................................................................8-3

Service Center ......................................................................................................................................................8-3

Section 9. Warranty
Section A. Board Drawings and Schematics

Main Board........................................................................................................................................................... A-3

Power Supply....................................................................................................................................................... A-4

RF Amplifier Circuit............................................................................................................................................. A-5

Request Sense Circuit Hand A......................................................................................................................... A-6

Request Sense Circuit Hand B......................................................................................................................... A-7

Request Sense Circuit Foot A........................................................................................................................... A-8

Request Sense Circuit Foot B........................................................................................................................... A-9

Display Board.................................................................................................................................................... A-10

Display Logic ......................................................................................................................................................A-11

Monopolar Select Circuit.................................................................................................................................. A-12

Main Printed Circuit Board............................................................................................................................... A-13

Display Printed Circuit Boards........................................................................................................................ A-14

Relay Printed Circuit Board............................................................................................................................. A-15

Front Panel Assembly...................................................................................................................................... A-16

Back Panel Assembly....................................................................................................................................... A-17

Final Assembly.................................................................................................................................................. A-18

vi SurgiStat II Service Manual

SECTION

1The SurgiStat II

Electrosurgical Generator

This section includes the following information:

1

• Key features

• Components and accessories

• Safety

Caution

Read all warnings, cautions, and instructions provided with this generator before
using.

Read the instructions, warnings, and cautions provided with electrosurgical
accessories before using. Specific instructions are not included in this manual.

SurgiStat II Service Manual 1-1

Functional Description

The SurgiStat II is a multipurpose electrosurgical generator for use in physician’s
offices and surgi-centers. It provides unsurpassed performance, flexibility,
reliability, and user convenience in one compact package.

The SurgiStat II generator includes digital technology. This new technology is
evident in the self-checking circuitry and error code readouts. The unit offers
monopolar and bipolar electrosurgical operations.

The following are SurgiStat II key advan tages and benefits.

Power Capabilities Up to 120 watts (W) of Pure Cut

@ 500 ohms (
Up to 90 W of Blend @ 800
Up to 80 W of Desiccation @ 1000

Ω).

Ω.

Ω.

Up to 40 W of Fulguration @ 1000
Up to 30 W of Bipolar @ 200

T wo Levels of Coagulation:
Desiccation and Fulguration

Return Electrode Monitoring
System

Memory The generator automatically powers

Desiccation provides precise control
of bleeding in localized areas.

Fulguration provides greater control of
bleeding in highly vascular tissue over
broader tissue surface areas.

The unit incorporates a return
electrode contact quality monitoring
system (RECQMS). This system
determines the type of patient return
electrode attached (single-plate or
split-plate).

It also continuously monitors the
contact impedance between the
patient and the split-plate patient
return electode.

Contact impedance is only monitored
when approved split-plate patient
return electrodes are used.

up to the last modes selected, and
previously set power settings.

Ω.

Ω.

Isolated (Floating) Radio
Frequency (RF) Output

This minimizes the potential of
alternate site burns.

1-2 SurgiStat II Service Manual

Electrosurgical Generator

Unit Description

Standard Front Panel
Connectors

Self Diagnostics These diagnostics continually monitor

These connectors accept the latest
monopolar and bipolar instruments.

the unit to ensure proper
performance.

Whenever they detect a problem,
medical personnel receive audible
and visual alarm responses, and the
output is suspended until the alarm
condition is cleared.

The SurgiStat II elect rosurgical generator is a self-contained uni t, cons isting of
the main enclosure and power cord. The main components incorporated in the
generator are:

• Front Panel Components Power switch, two dials for controlling power

output, membrane switches for selecting modes, receptacles for connecting
electrosurgical accessories, and indicators that show the current settings and
patient return electrode status.

The SurgiStat II

• Rear Panel Components Volume control, footswitch receptacle, power cable

receptacle and fuse holder, and equipotential grounding lug.

• Internal Components Display board, main board, pad sensing module,

speaker board, and relay board.

Safety Precautions when Testing the Generator

Before testing this generator it is important that you read, understand, and follow
the instructions supplied with it. Also, be familiar with any other equipment used
to install and test the generator.

General Warnings, Cautions, and Notices

Warning

Use the generator only if the self-test has been completed as described.
Otherwise, inaccurate power outputs may result.

The instrument receptacles on this generator are designed to accept only one
instrument at a time. Do not attempt to connect more than one instrument at a
time into a given receptacle. Doing so will cause simultaneous activation of the
instruments.

SurgiStat II Service Manual 1-3

Caution

Do not stack equipment on top of the generator or place the generator on top of
electrical equipment. These configurations are unstable and/or do not allow
adequate cooling.

Provide as much distance as possible between the electrosurgical generator and
other electronic equipment (such as monitors). An activated electrosurgical
generator may cause electrical interference with them.

Do not turn the activation tone down to an inaudible level. The activation tone
alerts the surgical team when an accessory is active.

Notice

If required by local codes, connect the generator to the hospital equalization
(grounding) connector with an equipotential cable.

Connect the power cord to a wall receptacle having the correct voltage.
Otherwise, product damage may result.

Active Accessories

Warning

Electric Shock Hazard Do not connect wet accessories to the generator.
Electric Shock Hazard Ensure that all accessories and adapters are correctly

connected and that no metal is exposed.

Caution

Accessories must be connected to the proper receptacle type. In particular,
bipolar accessories must be connected to the bipolar instrument receptacle only.
Improper connection may result in inadvertent generator activation or a contact
quality monitor alarm.

Set power levels to the lowest setting before testing an accessory.

Notice

During bipolar electrosurgery, do not activate the generator until the forceps have
made contact with the patient. Product damage may occur.

1-4 SurgiStat II Service Manual

Fire/Explosion Hazards

Warning

Explosion Hazard Do not install the generator in the presence of flammable

anesthetics, gases, liquids, or objects.
Fire Hazard Do not place active accessories near or in contact with flammable

materials (such as gauze or surgical drapes). Electrosurgical accessories that are
activated or hot from use can cause a fire. Use a holster to hold electrosurgical
accessories safely away from personnel and flammable materials.

Fire Hazard Do not use extension cords.
Fire Hazard For continued protection against fire hazard, replace fuses only

with fuses of the same type and rating as the original fuse.

Generator Electric Shock Hazards

Warning

Do not remove any covers or panels exposing the internal components. Refer to
a Valleylab representative for service.

Connect the generator power cord to a properly grounded receptacle. Do not use
power plug adapters.

Electrosurgical Generator

The SurgiStat II

Do not connect a wet power cord to the generator or to the wall receptacle.
Always turn off and unplug the generator before cleaning.
Do not touch any exposed wiring or conductive surfaces while the generator is

disassembled and energized. Never wear a grounding strap when working on an
energized generator.

When taking troubleshooting measurements use appropriate precautions, such
as using isolated tools and equipment, using the “one hand rule,” etc.

Potentially lethal AC and DC voltages are present in the AC line circuitry, high
voltage DC circuitry , and associated mounting and heat sink hardware described
in this manual. These potentials are not isolated from the AC line. Take
appropriate precautions when testing and troubleshooting this area of the
generator.

High frequency, high voltage signals that can cause severe burns are present in
the RF output stage and in the associated mounting and heat sink hardware.
Take appropriate precautions when testing and troubleshooting this area of the
generator.

SurgiStat II Service Manual 1-5

Servicing

Caution

Read all warnings, cautions, and instructions provided with this generator before
testing.

Notice

There are no internal user serviceable parts. For repairs, return the generator to
Valleylab.

Cleaning

Notice

Do not clean the generator with abrasive cleaning or disinfectant compounds,
solvents, or other materials that could scratch the panels or damage the
generator.

1-6 SurgiStat II Service Manual

2Controls, Indicators,

and Receptacles

This section describes the front and rear panels, including all
controls, indicators, receptacles, the fuse drawer, and ports.

SECTION

2

SurgiStat II Service Manual 2-1

Front Panel

Figure 2-1.Layout of controls,
indicators, and receptacles on
the front panel

2-2 SurgiStat II Service Manual

Controls and Indicators Overview

Users may control most SurgiStat II functions from the front panel. Each control
is plainly marked and colored on the front panel for quick reference. Volume
control and a footswitch connector are on the rear panel.

Normal operations involve activating the generator with either a front-connected
handswitch OR a rear-connected footswitch. The following components are the
user interface.

Power Switch The rocker ON/OFF switch on the lower left corner

allows turning off the generator when the unit is not in
use.

Membrane
Function Switches

Power Control
Knobs

Watts Display A &
B (Cut and Coag)

Visual LED
Indictors

The front panel overlay contains six membrane function
switches (sometimes called matrix switches). There is a
membrane switch dedicated for each operational mode.
These switches switch the unit between mode settings.

These rotary knobs allow you to select the desired RF
power level for all modes of operation. The power
control knobs move in increments of one watt.

These large power output displays report the
generator’s output power setting from 1 to 120 watts in
one watt increments (at the rated load). During
operation, the numeral output of the display gives the
surgeon an indication of available generator power.

Mode LEDs indicate the mode setting.
The YELLOW indicators and controls indicate cutting

and blending operations. A yellow field LED indicates
that either a Pure Cut or Blend mode is activated.

The BLUE indicators and controls indicate desiccation,
fulguration, and bipolar operation. The blue field LED
indicates that either Desiccate, Fulgurate, or Bipolar
mode is activated.

The Footswitch Control LED Indicator indicates which
mode the footswitch is presently in.

Monopolar footswitch control allows the user to activate
the monopolar mode when using footswitch controlled
accessories.

Bipolar footswitch control allows the user to activate the
bipolar mode.

A return electrode indicator displays which type of
patient return electrode is attached to the patient. It also
has an associated audio alarm that sounds when a
patient return electrode is not detected during activation.

Controls, Indicators,

and Receptacles

Audible Indicators An activation tone sounds whenever the SurgiStat II

Electrosurgical Generator is activated. The volume may
be adjusted up or down on the rear of the unit.

An alarm sounds during all alarm conditions. Y ou cannot
adjust the volume of this alarm.

SurgiStat II Service Manual 2-3

Cut and Blend Controls

Figure 2-2.Controls for the Cut
and Blend modes

Cut Indicator

Illuminates when
Pure Cut mode is
selected.

Cut Selector

When pressed,
selects the Pure
Cut mode.

Cut and Blend
Power Display
(watts)

Indicates the
power set for the
Pure Cut or Blend
mode.

Cut and Blend
Activation
Indicator

Illuminates when
either Pure Cut or
Blend mode is
activated.

Blend Selector

When pressed,
selects the Blend
mode.

Blend Indicator

Illuminates when
Blend mode is
selected.

Cut and Blend Power
Control Dial

Increases or decreases the
Cut or Blend power output in
increments
of one watt.

2-4 SurgiStat II Service Manual

Coag and Bipolar Controls

Figure 2-3.Controls for the
Desiccate, Fulgurate, and
Bipolar modes

Desiccate Indicator

Illuminates when
Desiccate mode is
selected.

Desiccate Selector

When pressed, selects
the Desiccate mode.

Controls, Indicators,

Coag and Bipolar
Power Display (watts)

Indicates the power set
for any Coag or Bipolar
mode.

Coag and Bipolar
Activation Indicator

Illuminates when Desiccate,
Fulgurate, or Bipolar modes
are activated.

and Receptacles

Fulgurate Indicator

Illuminates when
Fulgurate mode is
selected.

Fulgurate Selector

When pressed,
selects the
Fulgurate mode.

Bipolar Selector

When pressed,
selects the Bipolar
mode.

Bipolar Indicator

Illuminates when
Bipolar mode is
selected.

Coag and Bipolar Power Control Dial

Increases or decreases the Coag or
Bipolar power output in increments
of one watt.

SurgiStat II Service Manual 2-5

Indicators

Figure 2-4.Indicators for power,
return electrodes, and footswitch
control

Bipolar Footswitch Control
Indicator and Symbol

Illuminates when bipolar foot
control is selected.

Patient Return Electrode Alarm Indicator

Illuminates when the system detects a patient
return electrode alarm condition.

Power Indicator

Illuminates when the
unit is on.

Split-Plate Patient Return
Electrode Indicator

Illuminates when the system
detects a split-plate.

Single-Plate Patient Return
Electrode Indicator

Illuminates when the system
detects a single-plate.

Monopolar Footswitch Control
Indicator and Symbol

Illuminates when monopolar foot
control is selected.

Footswitch
Control Selector

When pressed,
switches between
monopolar and
bipolar foot control.

2-6 SurgiStat II Service Manual

Power Switch and Receptacles

Figure 2-5.Location of the unit
power switch and front panel
receptacles

Controls, Indicators,

and Receptacles

Bipolar Receptacle

Accepts standard
cables for bipolar
handpieces.

Power On/Off
Switch

Turns the unit
on or off.

Patient Return Electrode
Receptacle

Accepts a standard patient
return electrode plug.

Monopolar Handswitching
Receptacle

Accepts standard three-pin
handpieces. Connect
handswitching accessories.

Monopolar Footswitching
Receptacle

Accepts cables or adapters
equipped with standard (Bovie
#12) active plugs. Connect
footswitching accessories.

SurgiStat II Service Manual 2-7

Rear Panel

Figure 2-6.Layout of connectors
and controls on the rear panel

Equipotential Connector

Allows attaching a standard
grounding cable to chassis ground
for additional protection against
leakage current.

V o lume Control

Controls the volume of the audible tones
produced during normal unit activation.
To increase volume, rotate the knob
clockwise.

Power Cable Receptacle
and Fuse Holder

Connects a hospital grade
power cord to supply AC
mains power to the unit.

Footswitch Receptacle

Accepts the E6008 or E6008B
monopolar footswitch. Use the
monopolar footswitch for both
monopolar and bipolar
activation. Use only a Valleylab
monopolar footswitch with a
SurgiStat II generator . Use of an
incompatible footswith may
cause unexpected output.

Serial Number Label

Specifies the unit model
number, serial number,
nominal line voltage,
frequency, current, and
power consumption.

2-8 SurgiStat II Service Manual

Symbols on the Front Panel

Symbols Description

Cut Controls

Cut mode

Coag Controls

Indicators

Blend mode

Desiccate mode

Fulgurate mode

Bipolar mode

Single-plate patient return electrode

Controls, Indicators,

and Receptacles

Split-plate patient return electrode

Monopolar footswitch control

Footswitch (on the selector button)

Bipolar footswitch control

SurgiStat II Service Manual 2-9

Symbols Description

Power Switch and Handpiece Connectors

Read instructions before use

Type CF eq ui p ment

Patient return electrode

RF isolated – patient connections are isolated from earth at

F

high frequency

Caution – high voltage

Monopolar output

Bipolar output

2-10 SurgiStat II Service Manual

Symbols on the Rear Panel

Symbols Description

Symbols on the Rear Panel

Equipotential ground stud

Nonionizing radiation

Volume control

Controls, Indicators,

and Receptacles

Danger

Explosion risk if used with flammable anesthetics

Monopolar footswitch

Read instructions before use

SurgiStat II Service Manual 2-11

2-12 SurgiStat II Service Manual

3Technical Specifications

All specifications are nominal and subject to change without notice.
A specification referred to as “typical” is within ± 20% of a stated
value at room temperature (25° C / 77° F) and a nominal input

SECTION

3

power voltage.

SurgiStat II Service Manual 3-1

Performance Characteristics

Input Power

Surg II-20
110–120 Volt

Nominal input power
voltage for calibration:
115 V

Mains line frequency
range (nominal):
50-60 Hz

Power consumption:
360 VA

Fuses (2): 5A (Slow
Blow)

Surg II-8
220–240 Volt

Nominal input power
voltage for calibration:
230 V

Mains line frequency
range (nominal): 50­60 Hz

Power consumption:
360 VA

Fuses (2): 3.15A (Slow
Blow)

Surg II-J
90–110 Volt

Nominal input power
voltage for calibration:
100 V

Mains line frequency
range (nominal):
50-60 Hz

Power consumption:
360 VA

Fuses (2): 5A (Slow
Blow)

Duty Cycle

Under maximum power settings and rated load conditions (Pure Cut, 120 W @
500 Ω load), the generator is suitable for activation times of 10 seconds on,
30 seconds off for one hour.

Notice

The internal temperature of the unit is constantly being monitored. If the
temperature rises above 85° C (185° F) an alarm sounds, the system displays an
error code, and the system disables output power.

Dimensions and Weight

Width 26 cm (10.25 in.)

Depth 30.5 cm (12 in.)

Height 15.2 cm (6 in.)

Weight < 6.5 kg (< 14 lbs)

3-2 SurgiStat II Service Manual

Operating Parameters

Ambient temperature
range

Relative humidity 15% to 75%, noncondensing

Atmospheric pressure 700 to 1060 millibars

Warm-up time If transported or stored at temperatures outside the

10° to 40° C (50° to 104° F)

operating temperature range, allow one hour for the
generator to reach room temperature before use.

T ransport and Storage

Ambient temperature
range

Relative humidity 0% to 75%, noncondensing

Atmospheric pressure 500 to 1060 millibars

-34° to 65° C (-29° to 149° F )

Technical Specifications

Audio Volume

The audio levels stated below are for activation tones (bipolar, cut, and coag) and
alarm tones (return electrode and system alarms) at a distance of one meter . Alarm
tones meet the requirements for IEC 60601-2-2.

Activation Tone

Volume (adjustable) 45 to 65 dBA

Frequency Cut: 1 kHz

Blend: 1 kHz
Desiccation: 2 kHz
Fulguration: 2kHz
Bipolar: 2 kHz

Duration Continuous while the generator is activated

SurgiStat II Service Manual 3-3

Alarm Tone

Volume (not
adjustable)

Frequency 2 kHz for 1 second, then

Duration 4 seconds

70 dBA ± 5 dBA

1 kHz for 1 second

Patient Return Electrode Sensing

Single-Plate Measurement current: < 100 µA

Measurement frequency: 62.5 kHz ± 2.5 kHz
Set resistance: 0

Continuous measurement:

Once the system establishes the single-plate electrode
resistance, an increase of 20
cause an alarm. When the alarm condition exists, the
system deactivates output power.

Ω to 5 Ω ± 3 Ω

Ω ± 5 Ω in resistance will

Split-Plate Measurement current: < 100 µA

Measurement frequency: 62.5 kHz ± 2.5 kHz
Set resistance: 10

Continuous measurement:

Once the system establishes the split-plate electrode
resistance, an increase of 40% in resistance or up to

Ω (whichever is less) will cause an alarm. A

150
decrease of resistance below 4
alarm. When the alarm condition exists, the system
deactivates output power.

Ω ± 5 Ω to 135 Ω ± 10 Ω

Ω ± 2 Ω will cause an

The system presents audible and visible alarms when it does not sense a patient
return electrode:

• When a fault condition occurs, the alarm indicator flashes red, an alarm tone
sounds, and the system disables output power.

• The red LED alarm indicator remains illuminated until you correct the
condition that caused the alarm condition.

• Activation attempts during an alarm condition result in an audio alarm and the
alarm indicator flashes.

• When the alarm condition is resolved, the green single or split-plate indicator
will illuminate.

• The system measures the return electrode sensing current according to
IEC 60601-1.

3-4 SurgiStat II Service Manual

Low Frequency (50-60 Hz) Leakage Current

Enclosure source
current, ground open

Source current, patient
leads, all outputs

Sink current at high
line, all inputs

< 300 µA 90V-110V mains voltage
110V-120V

< 500 µA 220V-240V mains voltage

Normal polarity, intact ground: < 10 µA
Normal polarity, ground open: < 50 µA
Reverse polarity, ground open: < 50 µA

< 50 µA

High Frequency (RF) Leakage Current

Bipolar RF leakage
current

Monopolar RF leakage
current

< 39 mA

< 150 mA

rms

rms

Technical Specifications

Standards and IEC Classifications

The SurgiStat II generator meets all pertinent clauses of the IEC 60601-1 second
edition and IEC 60601-2-2 third edition.

Class I Equipment (IEC 60601-1)

Accessible conductive parts cannot become live in the event of a basic insulation
failure because of the way in which they are connected to the protective earth
conductor.

Type CF Equipment (IEC 60601-1)/Defibrillator Proof

The SurgiStat II generator provides a high degree of protection
against electric shock, particularly regarding allowable leakage
currents. It is type CF isolated (floating) output and may be used
for procedures involving the heart.

SurgiStat II Service Manual 3-5

Liquid Spillage (IEC 60601-2-2 Clause 44.3)

The SurgiStat II generator enclosure is constructed so that liquid spillage in
normal use does not wet electrical insulation or other components which, when
wetted, are likely to adversely affect the safety of the equipment.

Electromagnetic Interference

When placed on or beneath an activated Valleylab electrosurgical generator, the
SurgiStat II generator operates wit hout interference. The generator minimizes
electromagnetic interference to video equipment used in the operating room.

Voltage Transients (Emergency Generator Mains
Transfer)

The SurgiStat II generator operates in a safe manner when the transfer is made
between line AC and an emergency generator voltage source.

Electromagnetic Compatibility (IEC 60601-1-2 and
IEC 60601-2-2)

The SurgiStat II generator complies with the appropriate IEC 60601-1-2 and
IEC 60601-2-2 specifications regarding electromagnetic compatibility.

Notice

The SurgiStat II should not be used adjacent to or stacked with equipment other
than specified in the SurgiStat II User Guide and Service Manual. If adjacent or
stacked use is necessary, the SurgiStat II should be observed to verify normal
operation in the configuration in which it will be used.

The SurgiStat II intentionally applies RF energy for diagnosis or treatment during
activation. Observe other electronic medical equipment in the vicinity during the
SurgiStat II activation for any possible adverse electromagnetic effects. Ensure
adequate separation of electronic medical equipment based on observed
reactions.

The use of accessories, other than specified in the SurgiStat II User Guide and
Service Manual, may result in increased emissions or decreased immunity of the
SurgiStat II.

3-6 SurgiStat II Service Manual

Guidance and manufacturer's declaration - electromagnetic emissions

The SurgiStat II is intended for use in the electromagnetic environment specified below. The customer or the user of
the SurgiStat II should ensure that it is used in such an environment.

Emissions test Compliance Electromagnetic environment -

guidance

RF emissions

CISPR 11

RF emissions

CISPR 11

Harmonic emissions

IEC 61000-3-2

Voltage fluctuations/ flicker

emissions IEC61000-3-3

Group 2 The SurgiStat II uses RF energy only

for its internal function. Therefore, its
RF emissions are very low and are
not likely to cause any interference in
nearby electronic equipment.

Class A The SurgiStat II is suitable for use in

all establishments other than
domestic and those directly

Class A

Complies

connected to the public low-voltage
power supply network that supplies
buildings used for domestic purposes.

Technical Specifications

SurgiStat II Service Manual 3-7

Guidance and manufacturer's declaration - electromagnetic immunity

The SurgiStat II is intended for use in the electromagnetic environment specified below. The customer or the user of
the SurgiStat II should assure that it is used in such an environment.

Immunity test IEC 60601 test

Electrostatic discharge

(ESD)

IEC 61000-4-2

Electrical fast transient/

burst IEC 61000-4-4

Surge

IEC 61000-4-5

Volt a g e di ps, short

interruptions and voltage

variations on power supply

input lines

IEC 61000-4-11

+/-6 kV contact

+/-2 kV for power

supply lines

+/-1 kV for input/

output lines

+/-1 kV differential

+/-2 kV common

(>95% dip in Ut)

for 0,5 cycle

(>60% dip in Ut)

for 5 cycles

(>30% dip in Ut)

for 25 cycles

(>95% dip in Ut)

level

+/-8 kV air

mode

mode

<5% Ut

40% Ut

70% Ut

<5% Ut

for 5 sec

Compliance level Electromagnetic environment -

guidance

+/-6 kV contact

+/-8 kV air

+/-2 kV for power

supply lines

+/-1 kV for input/

output lines

+/-1 kV differential

mode

+/-2 kV common

mode

<5% Ut

(>95% dip in Ut)

for 0,5 cycle

40% Ut

(>60% dip in Ut)

for 5 cycles

70% Ut

(>30% dip in Ut)

for 25 cycles

<5% Ut

(>95% dip in Ut)

for 5 sec

Floors should be wood, concrete or
ceramic tile. If floors are covered with
synthetic material, the relative humidity
should be at least 30%.

Mains power quality should be that of a
typical commercial or hospital environment.

Mains power quality should be that of a
typical commercial or hospital environment.

Mains power quality should be that of a
typical commercial or hospital environment.
If the user of the SurgiStat II requires
continued operation during power mains
interruptions, it is recommended that the
SurgiStat II be powered from an
uninterruptible power supply or a battery.

Power frequency (50/60

Hz) magnetic field

IEC 61000-4-8

NOTE: Ut is the a.c. mains voltage prior to the application of the test level.

3 A/m 3 A/m Power frequency magnetic fields should be

at levels characteristic of a typical location
in a typical commercial or hospital
environment.

3-8 SurgiStat II Service Manual

Guidance and manufacturer's declaration - electromagnetic immunity

The SurgiStat II is intended for use in the electromagnetic environment specified below. The customer or the user of
the SurgiStat II should assure that it is used in such an environment.

Immunity test IEC 60601 test level Compliance level Electromagnetic environment -

guidance

Portable and mobile RF
communications equipment should be
used no closer to any part of the
SurgiStat II, including cables, than the
recommended separation distance
calculated from the equation applicable
to the frequency of the transmitter.

Conducted RF IEC

61000-4-6

Radiated RF

IEC 61000-4-3

3 Vrms

150KHz to 80MHz

3 V/m

80MHz to 2.5GHz

3 V

3 V/m

Recommended separation distance

√P

d=1.2

d=1.2

√P 80MHz to 800MHz

d=2.3√P 800MHz to 2.5GHz

Where P is the maximum output power
rating of the transmitter in watts (W)
according to the transmitter
manufacturer and d is the
recommended separation distance in
meters (m).

Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,
should be less than the compliance level in each
frequency range

Interference may occur in the vicinity of
equipment marked with the following
symbol:

Technical Specifications

NOTE 1 At a 80MHz and 800MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and

reflection from structures, objects and people.

a. Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land
mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with
accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey
should be considered. If the measured field strength in the location in which the SurgiStat II is used exceeds the
applicable RF compliance level above, the SurgiStat II should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or relocating the SurgiStat II.

b. Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.

SurgiStat II Service Manual 3-9

Recommended separation distances between portable and mobile RF communication equipment and the

SurgiStat II

The SurgiStat II is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The Customer or the user of the SurgiStat II can help prevent electromagnetic interferences by maintaining
a minimum distance between portable and mobile RF communications equipment (transmitters) and the SurgiStat II
as recommended below, according to the maximum output power of the communications equipment.

Separation distance according to frequency of transmitter (m)

Rated maximum output

power of transmitter (W)

0.01 0.12 m 0.12 m 0.23 m

0.1 0.38 m 0.38 m 0.73 m

1 1.2 m 1.2 m 2.3 m

10 3.8 m 3.8 m 7.3 m

100 12 m 12 m 23 m

For transmitters rated at a maximum output power not listed above, the recommended separation distance d in
meters (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the
maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.

150 kHz to 80MHz

√P

d=1.2

80MHz to 800MHz

d=1.2√P

800MHz to 2.5GHz

d=2.3√P

NOTE 1 At a 80MHz and 800MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and

reflection from structures, objects and people.

3-10 SurgiStat II Service Manual

Output Power Characteristics

Maximum Output for Bipolar and Monopolar Modes

Power readouts agree with actual power into rated load to within 20% or 5 W,
whichever is greater. All measurements were taken at the nominal input power
voltage used for calibration.

Mode Output Power Output Frequency Repetition Rate Vp-p max

Crest Factor*

(Rated Load)

Cut 120 W @ 500

Blend 90 W @ 800

Desiccate 80 W @ 1000

Fulgurate 40 W @ 1000 Ω 410 kHz ± 50 kHz 25 kHz ± 5 kHz 6.5 kV 7.7 ± 20%

Bipolar 30 W @ 200

Ω 357 kHz ± 50 kHz N/A 2.5 kV 2.9 ± 20%

Ω 357 kHz ± 50 kHz 30 kHz ± 5 kHz 3.5 kV 3.3 ± 20%

Ω 475 kHz ± 50 kHz 57 kHz ± 5 kHz 4.5 kV 5.5 ± 20%

Ω 520 kHz ± 50 kHz 32 kHz ± 5 kHz 2.0 kV 6.9 ± 20%

* An indication of a waveform’s ability to coagulate bleeders without a cutting effect

Technical Specifications

SurgiStat II Service Manual 3-11

Output Power Curves

The curves that follow depict the changes for each mode at specific power
settings. All measurements were taken at the nominal input power voltage used
for calibration.

Monopolar Cut Curves

These measurements were taken using short (< 0.5 meter) leads. For each output
power vs. impedance curve, the upper curve represents readings taken at full
power; the lower curve, readings taken at half power.

Figure 3-1 .

Output power vs. impedance for
Pure Cut mode

Figure 3-2.

Peak voltage vs. power setting
for Pure Cut mode

Output Power (watts)

Load Resistance (ohms)

Open Circuit Peak Voltage (volts)

Output Power Setting (watts)

3-12 SurgiStat II Service Manual

Figure 3-3.

Output power vs. generator
settings for Pure Cut mode

130

120

110

100

90

80

70

60

50

40

30

20

10

Output Power (watts)

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 11 0 115 120

Generator Setting

Figure 3-4.

Output power vs. impedance for
Blend mode

Technical Specifications

Output Power (watts)

Load Resistance (ohms)

SurgiStat II Service Manual 3-13

Figure 3-5.

Peak voltage vs. power setting
for Blend mode

Figure 3-6.

Output power vs. generator
settings for Blend mode

Open Circuit Peak Voltage (volts)

Output Power Setting (watts)

100

90

80

70

60

50

40

30

20

10

Output Power (watts)

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Generator Setting

3-14 SurgiStat II Service Manual

Figure 3-7.

Output power vs
Desiccate mode

. impedance for

Monopolar Coag Curves

These measurements were taken using short (< 0.5 meter) leads.

Output Power (watts)

Load Resistance (ohms)

Figure 3-8.

Peak voltage vs. power setting
for Desiccate mode

Technical Specifications

Output Power Setting (watts)

Open Circuit Peak Voltage (volts)

SurgiStat II Service Manual 3-15

Figure 3-9.

Output power vs. generator
settings for Desiccate mode

80

70

60

50

40

30

20

10

Output Power (watts)

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80

Generator Setting

Figure 3-10.

Output power vs. impedance for
Fulgurate mode

Output Power (watts)

Load Resistance (ohms)

3-16 SurgiStat II Service Manual

Figure 3-11.

Peak voltage vs. power setting
for Fulgurate mode

Figure 3-12.

Output power vs. generator
settings for Fulgurate mode

Open Circuit Peak Voltage (volts)

Output Power Setting (watts)

40

35

30

25

20

15

10

5

0

Output Power (watts)

0 5 10 15 20 25 30 35 40

Technical Specifications

Generator Setting

SurgiStat II Service Manual 3-17

Figure 3-13.

Output power vs. impedance for
Bipolar mode

Bipolar Curves

Output Power (watts)

Load Resistance (ohms)

Figure 3-14.

Peak voltage vs. power setting
for Bipolar mode

Open Circuit Peak Voltage (volts)

Output Power Setting (watts)

3-18 SurgiStat II Service Manual

Figure 3-15.

Output power vs. generator
settings for Bipolar mode

30

25

20

15

10

5

Output Power (watts)

0

0 5 10 15 20 25 30

Generator Setting

Technical Specifications

SurgiStat II Service Manual 3-19

Figure 3-16.

Pure Cut mode waveform

Reference Output Waveforms

The following figures are the output waveforms as viewed on an oscilloscope.

Figure 3-17.

Blend mode waveform

3-20 SurgiStat II Service Manual

Figure 3-18.

Desiccation mode waveform

Figure 3-19.

Fulguration mode waveform

Technical Specifications

SurgiStat II Service Manual 3-21

Figure 3-20.

Bipolar mode waveform

3-22 SurgiStat II Service Manual

1Theory Of Operation

This section includes the following information:

SECTION

4

• Block diagram

• Functional overview of key circuits

• System logic

• Control signal inputs and outputs

SurgiStat II Service Manual 4-1

Block Diagram

Figure 4-1 .

Functional block diagram of the
SurgiStat II system

Functional Overview of Key Circuits

The following descriptions highlight the main circuits.

High Voltage DC Supply

The unit incorporates a high voltage power supply to generate the RF output
power. The high voltage power supply delivers an unregulated DC output for the
RF output. The nominal DC voltage from the high voltage power supply is
87 VDC ± 5 V.

Low Voltage DC Supplies

The unit incorporates four regulated low voltage levels to control generator
operations. They are: 15 VDC, 12 VDC, 8 VDC, and 5 VDC.

• The 15 VDC circuit supplies power for all of the request sense circuits, the
switching of the mode relays, and the audio circuit.

• The 12 VDC circuit supplies power for the patient electrode sense module.

• The 8 VDC circuit supplies power for the RF drive circuit. This circuit turns
on and off the power MOSFETS for the RF output power.

• The 5 VDC circuit supplies power for the logic system and all of the displays
and indicators.

4-2 SurgiStat II Service Manual

DC Supply Check Circuit

System logic uses the DC supply check circuit to monitor the high voltage DC
supply. If the voltage increases by 30%, the system displays error code E4 and
disables the RF output.

For isolation purposes, the high voltage sense voltage is measured from the 15­volt DC power supply.

Temperature Sensing Circuit

System logic uses the temperature sensing circuit to monitor the internal
temperature of the unit. If the temperature rises above 85° C (185° F), the system
displays error code E7 and disables the RF output.

Four Request Activation Sensing Circuits

System logic uses the activation request sensing circuit to detect both hand­controlled and foot-controlled activation requests. This circuit consists of a
Colpitts Oscillator (operating at approximately 50 kHz) and a level detection
circuit.

In a nonactivation status, the Colpitts oscillator operates at its set operating
frequency and presents a sine wave to the level detection circuit. The level
detection circuit converts the sine wave into a square wave. Activation will not
occur as long as a square wave is present.

When a resistance (approximately 200 Ω or less) is presented to the transformer’s
secondary winding by a hand-control or foot-control, the sense transformer is
essentially shorted. The “short” is felt on the transformer’s primary winding,
causing the Colpitts oscillator to temporarily shut down.

When the oscillator shuts down, the sense signal becomes +5 VDC (logic “1”).
This informs the system logic that a handswitch or footswitch activation request
has been made.

If the square wave (from any of the request sense circuits) is not present at the
system logic when the unit is initially turned on, the system displays an error
code, sounds an alarm, and disables RF output.

Speaker Circuit

System logic uses the audio circuit to generate activation tones and alarm tones.
You can adjust volume for the activation tones from the back panel of the unit.

Notice

You cannot adjust alarm volume up or down.

Theory Of Operation

SurgiStat II Service Manual 4-3

Patient Return Electrode Sensing Circuit

The patient return electrode sensing module senses and sends signals to the
system logic, which displays which type of patient return electrode is attached to
the patient.

When you connect a single-plate patient return electrode to the unit, the pad
sensing module will detect if the resistance is below 5 Ω. If it is, the SurgiStat II
will display the green single-plate LED on the front of the unit.

When you connect a split-plate patient return electrode to a patient and the pad
sensing module detects a resistance between 10 and 135 Ω, then the SurgiStat II
will display the green split-plate LED on the front of the unit.

The pad sensing module constantly monitors the patient contact quality. If the
impedance changes by a specific amount, then the unit displays an alarm and
immediately deactivates the RF output power.

Warning

Patient return electrode contact quality is only monitored when a split-plate
patient return electrode is attached to the patient.

RF Amplifier Circuit

The RF amplifier circuit generates the RF output energy that is delivered to the
patient. It is a single-ended power amplifier, incorporating three power MOSFETs
and two toroidal step-up transformers.

The digital PWM circuit and the system logic unit generate the initial RF drive
pulse. When the RF drive pulse turns the power MOSFETs “On,” current flows
from the high voltage supply through one of the output transformers, depending
on which mode the unit is in, through the clamping diodes, and then through the
MOSFETs to high voltage ground.

The energy developed by the “On” time is stored in an LC tank circuit. When the
MOSFETs are off, the energy is delivered to the patient through the output
capacitors. A longer “On” time develops more energy in the LC tank circuit;
therefore, more energy is delivered to the patient.

Monopolar Select Circuit

The monopolar select circuit switches the SurgiStat II between each of the four
monopolar modes. Matrix switches on the front panel allow mode selection. High
voltage relays switch and isolate the four monopolar configurations.

Monopolar/Bipolar Select Relays

The monopolar / bipolar select relays change which output transformer is used to
deliver the RF output to the patient.

4-4 SurgiStat II Service Manual

Controls and Indicators

The SurgiStat II uses the following controls and indicators:

•

Membrane switches These switches switch between modes.

•

Displays Seven segment displays indicate the output power in watts.

•

Mode indictors Green LEDs indicate the present mode of the unit.

•

Power control knobs These mechanical encoders adjust the output power

for each mode.

•

Power switch A double pole single throw switch snaps into the front bezel.

This switch supplies the AC mains current to the generator.

Digital PWM Circuit

The digital PWM circuit controls the output power of the unit. The system logic
uses this digitally controlled signal to provide a precise signal to the RF drive.

The power setting (generated by the user on the front of the unit) determines the
pulse width.

When the user sets the power, the system logic determines what the pulse width
needs to be to deliver the requested output.

System Logic

The control logic uses a field programmable gate array as the generator “brain.”
This system interprets all inputs and delivers the correct corresponding outputs.

This system controls every operation of the unit.
A system clock circuit, composed of an oscillator, provides the basic operating

frequency of 5 MHz.
The reset circuit provides a single pulse when you turn on the SurgiStat II

generator. This pulse resets the field programmable gate array to ensure proper
operation.

Theory Of Operation

SurgiStat II Service Manual 4-5

SurgiStat II Control Signal Inputs and Outputs

The following table lists the important input and output signals. From a
troubleshooting standpoint, the absence (and presence) of these signals will help
you isolate problems.

Signal Name Description

PAD_SNS_ERROR This is the input signal from the pad sense module that

informs the system logic that a pad sensing error has
occurred.

When a pad sense error occurs, a logic 1 (5 VDC) is
sent to the system logic section.

PAD_NSED This is an input signal from the pad sense module that

informs the system logic that a single-plate patient
return electrode is attached to the front jack strip.

When the pad sense module senses the presence of a
single-plate patient return electrode, a logic 0 (0 VDC)
is sent to the system logic.

PAD_SED This is an input signal from the pad sense module that

informs the system logic that a split plate patient return
electrode is attached to the patient.

When the pad sense module senses the presence of a
split-patient return electrode, a logic 0 (0 VDC) is sent
to the system logic.

AUD_DRV This is an output signal from the system logic that

generates the activation tones for all modes of
operation.

A 1 kHz square wave is generated when the cut or
blend mode is activated. A 2 kHz square wave is
generated when the coagulation, fulguration, or bipolar
mode is activated.

This signal is used by the audio circuit.

ALM_DRV This is an output signal from the system logic that

generates a 2 kHz / 1 kHz square wave for activating
the alarm siren.

This signal is used by the audio circuit.

AUX_RLY_DRV This is an output signal from the system logic that

controls the accessory relay on the back panel.

TAP_SEL This is an output signal from the system logic that

controls relays on the main board. The relays select
which secondary windings will be used from the
monopolar output transformer.

4-6 SurgiStat II Service Manual

Signal Name Description

OUT_SEL This is an output signal from the system logic that

controls relays on the main board. They control which
output transformer provides the RF output circuit
delivered to the patient.

HAND/FOOT_SEL This is an output signal from the system logic that

controls relays on the main board. These relays direct
which output jack receives the output RF power.

The output power for monopolar modes is switchable
from foot-controlled handpiece activation to hand­controlled (switching pencil) activation.

RF_DRV This is an output signal from the digital PWM circuit

that controls the pulse width duration for the RF drive.

CON_SENS This is an input signal that informs the system logic if

the 24-pin ribbon cable (between the main board and
the display board) is connected.

When the cable is connected, a logic 0 (0 VDC) is sent
to the system logic section. When the cable is
damaged, not secure, or not connected, a logic 1
(5 VDC) is sent to the system logic.

TEMP_SEN This is an input signal from the temperature sense

circuit that informs the system logic if the internal
temperature of the unit is above 85° C (185° F).

If the internal temperature of the unit is below 85° C
(185° F), a logic 1 (5 VDC) is sent to the system logic.

If the internal temperature of the unit rises above
85° C (185° F), a logic 0 (0 VDC) is sent to the system
logic.

HV_SENS This is an input signal from the high voltage sense

circuit that informs the system logic if a high voltage
error has occurred.

If the line voltage is within normal operating
parameters, a logic 1 (5 VDC) is sent to the system
logic.

If the line voltage increases by more than 30%, a logic
0 (0 VDC) is sent to the system logic.

ACT_REQ_HAND_A This is an input signal from the hand A request sense

circuit. hand A refers to the Cut button on the
handpiece. A Colpitts oscillator located on the main
board generates this signal.

When an activation request occurs, this oscillator
issues a logic 1 (5 VDC) signal.

Theory Of Operation

SurgiStat II Service Manual 4-7

Signal Name Description

ACT_REQ_HAND_B This is an input signal from the hand B request sense

circuit. Hand B refers to the Coag button on the
handpiece. A Colpitts oscillator located on the main
board generates this signal.

When an activation request occurs, this oscillator
issues a logic 1 (5 VDC) signal.

ACT_REQ_FOOT_A This is an input signal from the foot A request sense

circuit. foot A refers to the Cut pedal on the footswitch.
A Colpitts oscillator located on the main board
generates this signal.

When an activation request occurs, this oscillator
issues a logic 1 (5 VDC) signal.

ACT_REQ_FOOT_B This is an input signal from the foot B request sense

circuit. foot B refers to the Coag pedal on the
footswitch. A Colpitts oscillator located on the main
board generates this signal.

When an activation request occurs, this oscillator
issues a logic 1 (5 VDC) signal.

4-8 SurgiStat II Service Manual

1Generator Operation

This section covers the following topics:

SECTION

5

• Inspecting the generator and accessories

• Service personnel safety

• Installation and placement

• Functional (operational) checks

• Operating the unit

SurgiStat II Service Manual 5-1

Inspecting the Generator and Accessories

Before each use, inspect the unit and all accessories to verify good working order:

• Inspect for physical damage to the generator and its connections.

• Verify that the appropriate accessories and adapters are present.

• Inspect all cords and connectors for signs of wear, damage, and abrasion.

• Verify that the unit displays no error messages when turned on.

Service Personnel Safety

Warning

Hazardous Electrical Output This equi pment is for operational use only by a

trained, licensed physician. Bio-med technicians must also exercise caution
when testing a unit.

Electric Shock Hazard Connect the generator power cord to a properly
grounded receptacle. Do not use power plug adapters.

Connect the power cord to a properly polarized and grounded power source with
the frequency and voltage characteristics that match those listed on the back of
the unit.

Fire Hazard Do not use extension cords.

Caution

Do not stack equipment on top of the generator or place the generator on top of
electrical equipment. These configurations are unstable and/or do not allow
adequate cooling.

Provide as much distance as possible between the electrosurgical generator and
other electronic equipment (such as monitors). An activated electrosurgical
generator may cause interference with them.

Nonfunction of the generator may cause interruption of surgery. A backup
electrosurgical generator should be available for use.

Do not turn the activation tone down to an inaudible level. This activati on tone
alerts the surgical team when an accessory (and the generator) is active.

When using a smoke evacuator in conjunction with the electrosurgical generator,
place the smoke evacuator a distance away from the generator. Set the
generator’s volume control (on the rear panel) at a level that ensures all activation
tones may be heard.

5-2 SurgiStat II Service Manual

Notice

If required by local codes, connect the generator to the hospital equalization
connector with an equipotential cable. There is an equipotential connector on the
rear of the unit.

Connect the power cord to a wall outlet having the correct voltage. Otherwise,
product damage may result.

Installation and Placement

Place the SurgiStat II Electrosurgical Generator on any flat surface with a tilt
angle of not more than 10 degrees. The unit relies on natural convection cooling.
Do not block the rear vents.

Ensure that air flows freely on all sides of the unit.

Warning

Connect the power cord to a properly polarized and grounded power source with
the frequency and voltage characteristics that match those listed on the back of
the unit.

Functional (Operational) Checks

Generator Operation

Upon initial installation of the unit, perform the following checks. Refer to the
figures in Section 2, Controls, Indicators, and Receptacles, for the location of the
controls and connectors.

Caution

At no time should you touch the active electrode or bipolar forceps. A serious
burn could result.

How to Set Up and Start the SurgiStat II Unit

1. Verify that the power switch is in the Off (O) position and that no accessories

are connected to the unit.

2. Connect a hospital-grade power cable to the AC power cable receptacle on the

back of the unit, then to a properly grounded wall outlet.

3. Connect a two-pedal footswitch to the matching footswitch receptacle on the

back of the unit. Use only a Valleylab footswitch with the SurgiStat II
generator. Although other types of footswitches may fit, they may not be
compatible with this electrosurgical generator. Use of an incompatible
footswitch may cause unexpected output.

4. Do not connect a patient return electrode to the front of the unit at this time.

5. Turn on the unit by switching the power switch to the On (|) position.

6. The correct startup for the unit is a quick flash of all indicators and a series of

beeps. The unit will return to the last mode and power setting used.

SurgiStat II Service Manual 5-3

How to Check the Patient Return Electrode Alarm
Function

1. Adjust the power settings for each mode (Pure Cut, Blend, Desiccation,

Fulguration, and Bipolar) to 1 W.

2. Press the Cut pedal of the footswitch.

3. Verify that an alarm sounds for three seconds, and then the Patient Return

Electrode Sensing Alarm Indicator light illuminates. This indicates the patient
return electrode is not connected to the unit.

4. Verify that adjusting the volume control on the back of the unit (while the

alarm is sounding) cannot change the alarm’s sound level.

How to Check the Bipolar Mode (with Footswitch)

1. Select the Bipolar mode by pressing the Bipolar mode switch on the front

panel.
Note: The unit automatically changes to bipolar footswitching when you

select the Bipolar mode.

2. Verify that the Bipolar mode LED illuminates green, and that the system

generates the coag tone when you press the Coag pedal (blue) or the Cut pedal
(yellow) on the footswitch.

3. While activating the Bipolar mode, rotate the volume control over the full

range to verify that the sound is audible throughout the range.

4. Confirm that releasing the Coag pedal or Cut pedal returns the unit to an idle

state.

How to Check the Monopolar Mode (with Footswitch)

1. Select monopolar foot control by pressing the Footswitch Control Selector

until the Monopolar Footswitch Control Indicator illuminates.

2. Connect a single-plate patient return electrode to the return electrode

receptacle of the unit. Verify that the green single-plate patient return
electrode indicator illuminates.

3. Press the Cut pedal on the footswitch. Verify that the Cut and Blend

Activation Indicator illuminates and that the system generates the Cut
activation tone.

4. While activating the Cut mode, rotate the volume control over the full range

to verify that the sound is audible throughout the range.

5. Press the coag pedal on the footswitch. Verify that the Desiccate, Fulgurate,

and Bipolar Activation Indicator illuminates and that the system generates the
coagulation activation tone.

6. While activating the Coag mode, rotate the volume control over the full range

to verify that the sound is audible throughout the range.

5-4 SurgiStat II Service Manual

Operating the Unit

How to Check the Monopolar Mode (with Handswitch)

1. Connect a handswitching handpiece to the Monopolar Handswitching

receptacle.

2. Activate, one at a time, the Cut and Coag handswitching controls. Verify that

each control causes the correct indicator and tone to sound.

Monopolar Cut Select the desired mode of operation (Pure Cut or Blend), then

select the power settings by rotating the Cut and Blend Power Control Dial.

Monopolar Coag Select the coag mode of operation (Desiccate or Fulgurate),

then select the power setting by rotating the Coag and Bipolar Power Control
Dial.

Bipolar Select the mode of operation for Bipolar (coagulation or fulguration),

then select the bipolar power settings by rotating the Coag and Bipolar Power
Control Dial.

Activate the generator by pressing the appropriate button on the handswitch or
footswitch.

Notice

One footswitch can activate either monopolar or bipolar operation.

Generator Operation

Monopolar Operation

T o activate ... Press this ... On this device ...

Pure Cut or Blend
modes

Desiccate or Fulgurate
modes

T o activate ... Press this ... On this device ...

Bipolar mode Blue (Coag) or yellow

Yellow button Handswitching pencil

Yellow or Cut pedal Footswitch

Blue button Handswitching pencil

Blue or Coag pedal Footswitch

Bipolar Operation

Footswitch

(Cut) pedal

SurgiStat II Service Manual 5-5

5-6 SurgiStat II Service Manual

1Maintenance

This section includes the following information:

SECTION

6

• Cleaning the unit

• Performing periodic inspection

• Replacing fuses

SurgiStat II Service Manual 6-1

Cleaning the Unit

Warning

Electric Shock Hazard Always turn off and unplug the generator before

cleaning.

Caution

Do not allow fluids to enter the generator chassis.
Do not sterilize the generator.

Notice

Do not clean the generator with abrasive cleaning or disinfectant compounds,
solvents, or other materials that could scratch the panels or damage the
generator.

Clean the generator after each use. Follow the procedures approved by your
institution or use a validated infection control procedure.

1. Turn off the generator. Unplug the power cord from the wall outlet.

2. Thoroughly wipe all surfaces of the generator and power cord with a mild

cleaning solution or disinfectant and a damp cloth.

Performing Periodic Inspection

Every six months, visually inspect the generator for signs of wear or damage. In
particular, look for any of the following problems:

• Damage to the power cord

• Damage to the power cable receptacle

• Obvious damage to the unit

• Damage to any receptacle

• Accumulation of lint or debris in or around the unit

6-2 SurgiStat II Service Manual

Replacing Fuses

Fuses for the unit reside directly below the power cable receptacle on the rear of
the unit.

To replace the fuses, follow this procedure:

1. Unplug the power cord from the wall outlet.

2. Remove the power cord from the power cable receptacle on the rear panel.

3. To release the fuse

drawer, insert a small

Power Cable
Receptacle

flathead screwdriver into
the slot on the drawer
below the power cord
receptacle. Then, slide the
drawer out.

4. Remove the two fuses and

replace them with new
fuses with the same values.

5. Insert the fuse drawer into the power cable receptacle.

Use the following fuses:

Surg II-20
110–120 V

VAC 250 250 250

Amps 5.0 A 3.15 A 5.0 A

Type Slow Blow Slow Blow Slow Blow

Surg II-8
220–240 V

Surg II-J
90–110 V

Fuse
Drawer

Maintenance

Size 5 x 20 mm 5 x 20 mm 5 x 20 mm

SurgiStat II Service Manual 6-3

6-4 SurgiStat II Service Manual

1Troubleshooting

This section includes error code descriptions and actions to take to
resolve them.

SECTION

7

SurgiStat II Service Manual 7-1

Recommended Equipment for Troubleshooting

Use the following equipment to troubleshoot the SurgiStat II electrosurgical
generator.

• Digital multimeter with leads

• Electrosurgical analyzer or a true RMS voltmeter, such as a Fluke 8920A

• Wideband current transformer, such as a Pearson 4100

• Noninductive RF load resistors 200 Ω, 500 Ω, 800 Ω, 1000 Ω

• Oscilloscope (dual channel) at 100 MHz

• Oscilloscope probes, (2) 10X and 1000X

• Valleylab footswitch

• Valleylab handswitching pencil (single use or reusable)

• Standard technician’s tool kit

• Miscellaneous test leads and cables

Troubleshooting the SurgiStat II

If the generator is not functioning properly, use the information in this section to
perform the following activities:

• Identify and correct the malfunction.

• If the system displayed an error code, take the appropriate action(s) to correct
the error condition.

Inspecting the Generator

If the SurgiStat II malfunctions, check for obvious condi tions that may have
caused the problem.

1. Check the generator for visible signs of physical damage.

2. Verify that all accessory cords are properly connected.

3. Check the power cord. Replace the power cord if you find exposed wires,

cracks, frayed insulation, or a damaged connector.

4. Open the fuse drawer and inspect the fuse housing and fuses for damage and

corrosion.

5. Verify that the fuses are firmly seated. An internal component malfunction in

the generator can damage the fuses.

6. You may need to replace the fuses if the generator fails the self-test or stops

functioning. Refer to Fuse Replacement in Section 6.

7-2 SurgiStat II Service Manual

Inspecting the Receptacles

Equipment required:

• Footswitch

• Bipolar cable

• Monopolar instruments (handswitch and footswitch)

• Return electrode cable

Procedure:

1. Turn off the generator.

2. Disconnect the power cord from the wall receptacle.

3. Check the footswitch receptacle on the rear of the unit for obvious signs of

obstruction and damage.

4. Insert the footswitch connector into the footswitch receptacle. Check for a

secure fit. Use only a Valleylab footswitch with the SurgiStat II generator.

If the footswitch receptacle is damaged, contact your Valleylab Service Center.

5. Check the bipolar receptacle on the front of the unit for obstruction or

damage.

6. Insert a bipolar cable into the bipolar receptacle on the front of the unit. Check

for a secure fit.

If the bipolar receptacle is damaged, contact your Valleylab Service Center.

7. Check the monopolar handpiece receptacle on the front of the unit for

obstruction or damage.

8. Insert a handswitching pencil into the monopolar handpiece receptacle on the

front of the unit. Check for a secure fit.

If the monopolar handpiece receptacle is damaged, contact your Vallylab
Service Center.

9. Check the monopolar foot-controlled receptacle on the front of the unit for

obstruction or damage.

10. Insert a monopolar foot-controlled handpiece into the monopolar foot-

controlled receptacle on the front of the unit. Check for a secure fit.

If the monopolar foot controlled receptacle is damaged, Contact your
Valleylab Service Center.

11. Check the patient return electrode receptacle on the front of the unit for a

broken pin or an obstruction.

12. Insert a return electrode cable into the return electrode receptacle, and check

for a secure fit.

If the return electrode receptacle on the front of the unit is damaged, contact
your Valleylab Service Center.

Troubleshooting

SurgiStat II Service Manual 7-3

Understanding Error Codes and Audio Tones

The SurgiStat II Generator includes automatic, continual self-diagnostics. If the
diagnostics detect an error, the system displays an error code, sounds an audible
tone, and deactivates the output power.

Any errors detected will shut down the RF output power.

Notice

Internal firmware self-diagnostics continually monitor unit operation to ensure
proper and safe performance.

Most error codes result from faults in accessories attached to the unit. The
following table lists the error codes, describes the error, and recommends actions
to take to resolve the error.

Error Code Description Recommended Action

F1 on the Cut/

Blend display
F1 on the

Desiccate/
Fulgurate/Bipolar
display
This is a start
activation type of
error and is the
result of powering
On while pressing
the pencil
activation button.

F2 Simultaneous
activation error

F3 Foot activation
error

E4 High voltage
error

Handswitch or monopolar footswitch
cut pedal may be stuck

Handswitch or monopolar footswitch
coag pedal may be stuck

Cut and Coag buttons activated
simultaneously (pencil or footswitch)

Monopolar handpiece activated while
in Bipolar mode

Line voltage error (Line voltage too
high; that is, the power supply is 30%
above the nominal value)

1. Turn off, then turn on the generator. Do not press
buttons or accessory activation devices during the
self-test.

2. If the alarm number reappears, disconnect all
accessories. Turn off, then turn on the generator
again.

3. If the problem persists, replace the handpiece or
footswitch and repeat Step 1.

4. If the alarm number reappears, record the number
and contact your Valleylab Service Center.

The unit does not allow simultaneous activation of the
Cut and Coagulation modes. Release either the Cut or
Coag button on the handpiece, or the Cut or Coag pedal
on the footswitch.

Release pressure on the handpiece buttons. Use the
footswitch to activate bipolar, or switch to monopolar
mode.

1. Turn the unit off.

2. Verify that the unit is connected to the correct line

voltage.

7-4 SurgiStat II Service Manual

Error Code Description Recommended Action

E5 Pulse width

error

E6 Delta check
error

Internal pulse width measurement
exceeds setting requirement s

Internal pulse width measurement
conflicts with calibrated value

1. Turn unit off.

2. If using a metal patient return electrode plate, verify

that the cable connections are secure and replace
cables with loose connections. Turn unit on.

3. If error code occurred directly after changing mode
of operation, turn on the unit and delay activation of
the accessories after changing mode of operation.

4. If alarm number reappears upon restarting the unit,
record the number and call the Valleylab Service
Center.

1. Turn unit off.

2. If error code occurred directly after changing mode

of operation, turn on the unit and delay activation of
the accessories after changing mode of operation.

3. If error code occurred directly after changing the
power setting during activation, turn on the unit and
limit the change of power to approximately three
watts per second.

4. If alarm number reappears upon restarting the unit,
record the number and call the Valleylab Service
Center.

E7 Temperature
error

E8 Connector
sensing error
caused by a
sensed open circuit

Internal temperature of the unit
exceeded limit

The 24-pin ribbon cable connected
between the main board and the
display board is either disconnected
or damaged.

1. Turn the unit off.

2. Allow the unit to cool for 20 minutes.

Troubleshooting

3. Restart the unit.

Contact your Valleylab Service Center.

SurgiStat II Service Manual 7-5

Correcting Common Problems

If a solution is not readily apparent, use the table on the following page to help
identify and correct specific malfunctions. After you correct the malfunction,
verify that the generator successfully completes the self test.

Situation Possible cause Recommended action

Generator does not respond when
turned on

Generator is on, but did not
complete the self test

Disconnected power cord, faulty wall
receptacle, or faulty power cord

Fuse drawer is open or fuses blown

Loose or disconnected internal cables

Faulty power entry module or
connections

Faulty power switch

Alarm condition exists

Loose or disconnected internal cables Contact your Valleylab Service

Faulty power switch

1. Check power cord connections
(generator and wall receptacle).

2. Connect the power cord to a
functional wall receptacle. If
necessary, replace the power
cord.

1. Close the fuse drawer. If
necessary, replace the fuse(s).

2. If a problem persists, contact your
Valleylab Service Center.

Contact your Valleylab Service
Center.

Check the display for an error code.
Note the number and refer to error
code list.

Center.

Main board malfunction

Display board malfunction

Activation and/or alarm tones do
not sound; speaker is
malfunctioning

Blank or confusing LED display Faulty ribbon cable between main

Loose or damaged connection
between speaker board and main
board

Loose or disconnected cable between
main board and display board

Main board malfunction

Display board malfunction

board and display board

Display board malfunction

Contact your Valleylab Service
Center.

Contact your Valleylab Service
Center.

7-6 SurgiStat II Service Manual

Situation Possible cause

Recommended action

Mode buttons do not operate
correctly when pressed

Generator is on and the accessory
is activated, but generator does
not deliver output

Loose or disconnected cable between
main board and display board

Loose or disconnected cable between
front panel overlay and display board

Damaged front panel overlay

Malfunctioning footswitch or
handswitching instrument

Display board malfunction

Power set too low Increase the power setting.

An error condition exists

Contact your Valleylab Service
Center.

1. Turn off the generator. Check and
correct all accessory connections.

2. Turn on the generator.

3. Replace the accessory if it

continues to malfunction.

Contact your Valleylab Service
Center.

1. Check the cut and co ag displays
for an error code number.

2. Note the number and refer to the
error codes descriptions in this
section.

Main board malfunction

RF output stage malfunction

Footswitch will not activate output Malfunctioning or damaged footswitch

receptacle

Footswitch activation signal lost on
main board

Incompatible footswitch

Contact your Valleylab Service
Center.

Contact your Valleylab Service
Center.

Use only a Valleylab footswitch with
the SurgiStat II generator.

Troubleshooting

SurgiStat II Service Manual 7-7

Situation Possible cause

Continuous monitor interference Faulty chassis-to-ground connections 1. Check and correct the chassis

Recommended action

ground connections for the
monitor and, if applicable, for the
generator.

2. Check other electrical equipment
in the room for defective grounds.

Interference with other devices
only when generator is activated

Electrical equipment is grounded to
different objects rather than a
common ground

Generator may respond to the
resulting voltage differences between
grounded objects

Malfunctioning monitor

Metal-to-metal sparking Check all connections to the

High settings used for fulguration Use lower power settings for

Electrically inconsistent ground wires
in the operating room

If interference continues when the
generator is activated, the monitor is
responding to radiated frequencies

Plug all electrical equipment into line
power at the same location.

Replace the monitor.

generator, patient return electrode,
and accessories.

fulguration or select the Desiccate
mode.

Verify that all ground wires are as
short as possible and go to the same
grounded metal.

Check with the manufacturer of the
monitor.

Some manufacturers offer RF choke
filters for use in monitor leads.

The filters reduce interference when
the generator is activated and
minimize the potential for an
electrosurgical burn at the site of the
monitor electrode.

7-8 SurgiStat II Service Manual

Situation Possible cause

Recommended action

Pacemaker interference Intermittent connections or metal-to-

metal sparking

Current traveling from active to return
electrode during monopolar
electrosurgery is passing too close to
pacemaker

Abnormal neuromuscular
stimulation (stop surgery
immediately)

Metal-to-metal sparking

1. Check all connections to the
generator.

2. It may be necessary to re-program
the pacemaker.

1. Use bipolar instruments, if
possible. If you must use a
monopolar instrument, place the
patient return electrode as close
as possible to the surgical site.

2. Make sure the current path from
the surgical site to the patient
return electrode does not pass
through the vicinity of the heart or
the site where the pacemaker is
implanted.

3. Always monitor patients with
pacemakers during surgery and
keep a defibrillator available.

4. Consult the pacemaker
manufacturer or hospital.

5. Contact the Cardiology
Department for further information
when use of electrosurgical
appliances is planned on patients
with cardiac pacemakers.

Troubleshooting

Check all connections to the
generator, patient return electrode,
and active electrodes.

Can occur during coag Use a lower power setting for the

Fulgurate mode or select the
Desiccate mode.

Abnormal 50-60 Hz leakage currents

Contact your Valleylab Service
Center.

SurgiStat II Service Manual 7-9

7-10 SurgiStat II Service Manual

SECTION

1Repair Policy and Procedures

This section contains the following information:

8

• The manufacturer’s responsibility

• Returning the generator for service

SurgiStat II Service Manual 8-1

Responsibility of the Manufacturer

Valleylab is responsible for the safety, reliability, performance, and service of the
generator only under the following circumstances:

• The user has followed the installation and setup procedures in this manual.

• Persons authorized by Valleylab performed assembly operation,
readjustments, modifications, or repairs.

• The electrical installation of the relevant room complies with local codes and
regulatory requirements, such as IEC and BSI.

• Equipment use is in accordance with the Valleylab instructions for use.

For warranty information, refer to Section 9, Warranty.

Returning the Generator for Service

Before you return the generator, call your Valleylab representative for assistance.
If instructed to send the generator to V alleylab, first obtain a Return Authorization
Number. Then, clean the generator and ship i t to Valleylab for service.

Obtain a Return Authorization Number

Call the Valleylab Customer Service Center for your area to obtain a Return
Authorization Number. Have the following information ready when you call:

• Hospital/clinic name/customer number

• Telephone number

• Department/address, city, state, and zip code

• Model number

• Serial number

• Description of the problem

• Type of repair to be done

8-2 SurgiStat II Service Manual

Clean the Generator

Warning

Electric Shock Hazard Always turn off and unplug the generator before

cleaning.

Caution

Do not allow fluids to enter the chassis.
Do not attempt to sterilize the generator.

Notice

Do not clean the generator with abrasive cleaning or disinfectant compounds,
solvents, or other materials that could scratch the panels or damage the
generator.

1. Turn off the generator, and unplug the power cord from the wall outlet.

2. Thoroughly wipe all surfaces of the generator and power cord with a mild

cleaning solution or disinfectant and a damp cloth. Follow the procedures
approved by your institution or use a validated infection control procedure.

Service Center

Ship the Generator

1. Attach a tag to the generator that includes the return authorization number and

the information (hospital, phone number, etc.) listed in Obtain a Return
Authorization Number.

2. Be sure the generator is completely dry before you pack it for shipment.

Package it in its original shipping container. If the original shipping container
is not available, request one when obtaining your Return Authorization
Number.

3. Ship the generator, prepaid, to the Valleylab Service Center.

For a complete list of service centers worldwide, please refer to the Valleylab
website:

http://www.valleylab.com/valleylab/international/service-world.html

Repair Policy and Procedures

SurgiStat II Service Manual 8-3

8-4 SurgiStat II Service Manual

2Warranty

SECTION

Valleylab, a division of Tyco Healthcare Group LP, warrants each product
manufactured by it to be free from defects in material and workmanship under
normal use and service for the period(s) set forth below. Valleylab’s obligation
under this warranty is limited to the repair or replacement, at its sole option, of
any product, or part thereof, which has been returned to it or its Distributor within
the applicable time period shown below after delivery of the product to the
original purchaser, and which examination discloses, to Valleylab’s satisfaction,
that the product is defective. This warranty does not apply to any product, or part
thereof, which has been repaired or altered outside Valleylab’s factory in a way so
as, in Valleylab’s judgment, to affect its stability or reliability, or which has been
subjected to misuse, neglect, or accident.

9

The warranty periods for Valleylab products are as follows:

ForceTriad Energy Platform One year from date of shipment
Electrosurgical Generators One year from date of shipment
RFG-3C Plus Lesion Generator One year from date of shipment
LigaSure Vessel Sealing System One year from date of shipment
LigaSure Reusable Instruments One year from date of shipment
Mounting Fixtures (all models) One year from date of shipment
Footswitches (all models) One year from date of shipment
Force Argon Units One year from date of shipment
OptiMumm Smoke Evacuator Two years from date of shipment
LigaSure Sterile Single Use Items Sterility only as stated on packaging
Sterile Single Use Items Sterility only as stated on packaging
Patient Return Electrodes Shelf life only as stated on packaging

SurgiStat II Service Manual 9-1

This warranty is in lieu of all other warranties, express or implied, including
without limitation, the warranties of merchantability and fitness for a particular
purpose, and of all other obligations or liabilities on the part of Valleylab.
Valleylab neither assumes nor authorizes any other person to assume for it any
other liability in connection with the sale or use of any of Valleylab’s products.

Notwithstanding any other provision herein or in any other document or
communication, Valleylab’s liability with respect to this agreement and products
sold hereunder shall be limited to the aggregate purchase price for the goods sold
by Valleylab to the customer. There are no warranties which extend beyond the
terms hereof. Valleylab disclaims any liability hereunder or elsewhere in
connection with the sale of this product, for indirect or consequential damages.

This warranty and the rights and obligations hereunder shall be construed under
and governed by the laws of the State of Colorado , USA. The sole forum for
resolving disputes arising under or relating in any way to this warranty is the
District Court of the County of Boulder, State of Colorado, USA.

Valleylab, its dealers, and representatives reserve the right to make changes in
equipment built and/or sold by them at any time without incurring any obligation
to make the same or similar changes on equipment previously built and/or sold by
them.

9-2 SurgiStat II Service Manual

APPENDIX

3Board Drawings and Schematics

This supplement contains the assembly drawings and schematics
for the following printed circuit boards:

A

• Control board

• Display board

• Footswitch board

• Power Supply/RF board.

SurgiStat II Service Manual A-1

A-2 SurgiStat II Service Manual