Dynatronics Dynatron 850 Plus User manual

i
SERVICE MANUAL
Dynatron®850plus &
Dynatron®550plus

Dynatron®850plus & 550plus
ii
CAUTION: Federal law restricts this device to sale by or on the order of a physician,
chiropractor, physical therapist, or dentist licensed by the law of the state in which said
person practices to use or order the use of the device.
IMPORTANT: Before treating a patient with the Dynatron 850plus or the Dynatron
550plus, see the “Contraindications, Warnings, and Precautions” in this manual.
INDICATIONS FOR USE:
Muscle stimulation therapy delivered by the Dynatron 850plus and 550plus is indicated
for the following uses:
1. relaxation of muscle spasm;
2. prevention or retardation of disuse atrophy;
3. increasing local blood circulation;
4. muscle re-education;
5. immediate postsurgical stimulation of calf muscles to prevent venous thrombosis; and
6. maintaining or increasing range of motion.
Interferential, premodulated, high volt, and microcurrent therapy are indicated for
providing temporary relief of chronic intractable pain.
INDICATIONS FOR ULTRASOUND USE:
Ultrasound therapy is intended to generate deep heat within body tissues for the treatment
of selected medical conditions such as relief of pain, muscle spasms, and joint
contractures, but not for the treatment of malignancies.
(21 CFR 890.5300)
Dynatron® 850plus and Dynatron® 550plus Service Manual
Revised June 2004
© Copyright 1997
Dynatronics Corporation
7030 Park Centre Drive
Salt Lake City, UT 84121
[phone] [phone]
ALL RIGHTS RESERVED

Dynatron®850plus & 550plus
iii
Table of Contents
Section I
Introduction I
Introduction to the Dynatron 850plus™ and 550plus™ ........................................................................ 2
New Features.......................................................................................................................................... 2
Treatment Options.................................................................................................................................. 3
Simplified Setup..................................................................................................................................... 4
Before You Treat a Patient..................................................................................................................... 4
How to Use This Manual........................................................................................................................ 4
Installation and Features............................................................................................................................ 5
Unpacking .............................................................................................................................................. 5
Standard Accessories.............................................................................................................................. 5
Soundheads and Probes.......................................................................................................................... 6
Accessories............................................................................................................................................. 6
Dynatron 850plus and Dynatron 550plus Physical Features.................................................................. 7
Instructions for Using Toggle Keys ..................................................................................................... 13
Time and Power Displays..................................................................................................................... 15
Ultrasound Heads (Dynatron 850plus only)......................................................................................... 15
Microcurrent Probes (optional accessory)............................................................................................ 16
High Volt Probe (optional accessory) .................................................................................................. 17
Quick Reference of Special Key Presses ................................................................................................. 18
Section II
Operation and Treatment Instructions
General Operating Instructions............................................................................................................... 20
Power On/Off ....................................................................................................................................... 20
Basic Treatment Setup.......................................................................................................................... 20
Conductance Bar Graph ....................................................................................................................... 21
“LEAD” Warning - No Patient Current ............................................................................................... 22
Interferential / Premodulated Instructions............................................................................................. 24
Basic Interferential / Premod Setup...................................................................................................... 24
Detailed Interferential / Premodulated Setup ....................................................................................... 25
Interferential / Premodulated Default Settings ..................................................................................... 28

Dynatron®850plus & 550plus
iv
Biphasic / Russian Instructions ................................................................................................................29
Basic Biphasic / Russian Setup.............................................................................................................30
Detailed Biphasic / Russian Setup ........................................................................................................30
Biphasic / Russian Default Settings......................................................................................................33
High Volt Instructions...............................................................................................................................35
Set Up High Volt Treatment with Electrodes .......................................................................................35
Set Up High Volt Treatment with Optional Probe................................................................................36
Basic High Volt Setup ..........................................................................................................................37
Detailed High Volt Setup......................................................................................................................37
High Volt Default Settings....................................................................................................................41
Microcurrent Instructions ........................................................................................................................42
Basic Microcurrent Setup .....................................................................................................................42
Microcurrent Treatment Time...............................................................................................................43
Detailed Microcurrent Setup.................................................................................................................43
Audio Tone ...........................................................................................................................................46
Microcurrent Default Settings...............................................................................................................46
How To Use Microcurrent Probes ........................................................................................................46
Ultrasound Instructions ............................................................................................................................48
Soundhead Warming.............................................................................................................................48
Turn Soundhead Warming Off / On .....................................................................................................49
Basic Ultrasound Setup.........................................................................................................................49
Detailed Ultrasound Setup ....................................................................................................................49
Ultrasound Default Settings..................................................................................................................51
Patient Coupling ...................................................................................................................................51
Poor Coupling.......................................................................................................................................52
Ultrasound Coupling Bar Graph ...........................................................................................................52
Head Temperature Hot..........................................................................................................................53
Head Temperature Bar Graph...............................................................................................................54
Display Watts or W/cm2.......................................................................................................................54
Combination Therapy Instructions .........................................................................................................56
Comboplus™ ........................................................................................................................................56
Stim Through the Soundhead................................................................................................................57
Combination Therapy Setup .................................................................................................................58
Modify Treatment .................................................................................................................................60
Combination Default Settings...............................................................................................................61

Dynatron®850plus & 550plus
v
Simultaneous Treatments......................................................................................................................... 62
Set Up A Second Treatment................................................................................................................. 62
Modify Simultaneous Treatments ........................................................................................................ 63
Stop One Treatment.............................................................................................................................. 63
Setting Defaults ......................................................................................................................................... 64
Save New Defaults ............................................................................................................................... 64
Restore Factory Defaults ...................................................................................................................... 65
Interferential Default Settings .............................................................................................................. 65
Premodulated Default Settings............................................................................................................. 65
Russian / Biphasic Default Settings ..................................................................................................... 65
High Volt Default Settings................................................................................................................... 66
Microcurrent Default Settings .............................................................................................................. 66
Ultrasound Default Settings ................................................................................................................. 66
Combination Default Settings .............................................................................................................. 66
Battery Operation ..................................................................................................................................... 67
Battery Requirements ........................................................................................................................... 68
Battery Life........................................................................................................................................... 68
Section III
General Modality Information
Interferential and Premodulated Therapy ............................................................................................. 70
Interferential (Quadpolar) Therapy ...................................................................................................... 70
Premodulated (Bipolar) Therapy.......................................................................................................... 70
Target.................................................................................................................................................... 71
Why Is Target Better? .......................................................................................................................... 71
Sweep ................................................................................................................................................... 72
Interferential Electrode Placement ....................................................................................................... 72
Russian / Biphasic Therapy...................................................................................................................... 73
Russian Stimulation.............................................................................................................................. 73
Biphasic Stimulation ............................................................................................................................ 73
Biphasic / Russian Parameters.............................................................................................................. 73
High Volt Therapy .................................................................................................................................... 76
High Volt Therapy with Electrodes...................................................................................................... 76
High Volt with Optional Probes........................................................................................................... 76
High Volt Waveform............................................................................................................................ 76
High Volt Settings................................................................................................................................ 76

Dynatron®850plus & 550plus
vi
Microcurrent Therapy ..............................................................................................................................78
Microcurrent Therapy with Electrodes .................................................................................................78
Microcurrent Therapy with Probes .......................................................................................................78
Microcurrent Waveforms......................................................................................................................78
Microcurrent Settings............................................................................................................................78
Ultrasound Therapy..................................................................................................................................79
About Ultrasound..................................................................................................................................79
SmartHeads...........................................................................................................................................79
Patient Coupling ...................................................................................................................................79
Soundhead Temperature .......................................................................................................................80
Section IV
Contraindications, Warnings, and Precautions
Contraindications, Warnings, & Precautions for Interferential, Premodulated, Russian, Biphasic, and
High Voltage Pulsed Stimulation .............................................................................................................82
Contraindications ..................................................................................................................................82
Warnings...............................................................................................................................................82
Precautions............................................................................................................................................83
Treatment Setup Warnings ...................................................................................................................84
Adverse Effects.....................................................................................................................................84
Use Only Dynatronics Accessories With This Device .........................................................................84
Contraindications, Warnings, & Precautions for Microcurrent Treatment........................................85
Indications for Use................................................................................................................................85
Contraindications ..................................................................................................................................85
Warnings...............................................................................................................................................85
Precautions............................................................................................................................................86
Adverse Reactions ................................................................................................................................86
Contraindications, Warnings, & Precautions for Ultrasound Treatment ...........................................87
Contraindications ..................................................................................................................................87
Precautions............................................................................................................................................88
Warnings...............................................................................................................................................88
Electrotherapy Usage Cautions................................................................................................................89
Carbon Electrodes.................................................................................................................................90
Self-Adhesive Electrodes......................................................................................................................91
Combination Treatment Usage Cautions ..............................................................................................92
Lead Wires............................................................................................................................................92
Test Leads .............................................................................................................................................93

Dynatron®850plus & 550plus
vii
Current Limit........................................................................................................................................ 93
Current Limit Warning......................................................................................................................... 94
Microcurrent Usage Cautions.................................................................................................................. 95
Ultrasound Usage Cautions...................................................................................................................... 96
Applicator Movement........................................................................................................................... 96
Patient Susceptibility............................................................................................................................ 96
Potential for Burns................................................................................................................................ 96
Output Power........................................................................................................................................ 97
Penetration of Ultrasound Waves......................................................................................................... 97
Coupling............................................................................................................................................... 97
Section V
Ultrasound Technical Information
Ultrasound Regulation............................................................................................................................ 100
Beam Profile ............................................................................................................................................ 101
Enter Soundhead Parameters................................................................................................................ 104
New SmartHeads™ ............................................................................................................................ 104
Using Older Model Soundheads With the 50 Series Plus .................................................................. 104
Calibration Procedure............................................................................................................................ 106
Problem Solving ...................................................................................................................................... 109
Soundhead Temperature Too Hot ...................................................................................................... 109
Cooling the Soundhead ...................................................................................................................... 109
Whirlpool Treatments......................................................................................................................... 109
Soundhead Temperature Too Cold..................................................................................................... 110
No Soundhead .................................................................................................................................... 110
Other Error Messages in the Display.................................................................................................. 110
Section VI
Technical Information
General Specifications ............................................................................................................................ 114
Dynatron 850plus and 550plus Specifications ................................................................................... 114
Stim Specifications............................................................................................................................. 114
Microcurrent Specifications ............................................................................................................... 114
High Volt Specifications .................................................................................................................... 115
Ultrasound Specifications (Dynatron 850plus only) .......................................................................... 115

Dynatron®850plus & 550plus
viii
Environmental Conditions ..................................................................................................................115
Safety Features of the Dynatron 850plus and 550plus .......................................................................115
Care and Cleaning Instructions...........................................................................................................116
Suggested Maintenance Schedule.......................................................................................................116
Routine Ultrasound Calibration Inspections (Dynatron 850plus only)...............................................117
Software Updates................................................................................................................................118
Returning a Unit for Repair ................................................................................................................118
Definition of Symbols.........................................................................................................................119
Equipment Classification....................................................................................................................119
Disposal of Equipment and Accessories.............................................................................................119
Additional Technical Information Available (for Technicians Only).................................................120
FDA Compliant Electrodes and Lead Wires.......................................................................................120
Medical Device Reporting Requirements..............................................................................................121
Reporting any Incident of Patient Discomfort ....................................................................................121
Section VII
Service
Processor Interaction ..............................................................................................................................124
Processor Interaction with the Keyboard and Displays ......................................................................124
Processor Interaction with Oscillators ................................................................................................124
Processor Interaction with the Output Jacks.......................................................................................124
Processor Control of Output Waveforms............................................................................................124
Basic Trouble Shooting Techniques.......................................................................................................125
Hands-On Testing Pads and Leads .....................................................................................................125
Installing Software Updates....................................................................................................................126
Installing Replacement Parts..................................................................................................................126
Section VIII
Schematics and QC Check Lists

Dynatron®850plus & 550plus
1
Section I
Introduction

Dynatron®850plus & 550plus
Introduction 2
Introduction to the
Dynatron 850plus™ and 550plus™
The Dynatron 850plus and Dynatron 550plus offer the practitioner a wide range of treatment
options in a single device. Both devices provide interferential and premodulated therapy,
high voltage pulsed stimulation, Russian and biphasic stimulation, and microcurrent. The
850plus also includes ultrasound and combination therapy.
The devices include the advantages of earlier Dynatronics models, such as customizable
treatments with convenient setup. In addition, these units are smaller and lighter in weight
than earlier models and now offer the option of battery operation, making the devices truly
portable. One additional channel is now dedicated to high volt therapy, allowing a greater
variety of simultaneous treatments. The manufacturer’s warranty for these devices is now
two years (see full warranty details at the back of this manual).
This manual provides operator information and instructions for both of these models. The
sections that discuss ultrasound and combination treatments apply only to the Dynatron
850plus model. All other sections of this manual apply to both devices. Sections of this
manual that apply only to the Dynatron 850plus are clearly marked.
New Features
For models having software greater than Rev. 1.01 or later, the following new features have
been added (effective January 1998).
• Conductance Bar Graph. A graphical representation of conductivity during and
interferential, premodulated, or microcurrent treatment.
• Ultrasound Coupling Bar Graph. Shows soundhead coupling during an ultrasound
treatment.
• Soundhead Temperature Bar Graph. Indicates when soundhead temperature is too hot
during a treatment.
• “Lead” warning. A new warning displayed if the device detects an open circuit,
indicating no patient current is being delivered and the treatment setup must be inspected.
• New warnings notifying the user when the soundhead is too hot, or when the soundhead
is not detected by the device
These new features are described in greater detail in the treatment instructions later in this
manual. The determine the software revision level for the Dynatron device, power the device
on and observe the number shown in the Time display at the end of the device’s startup
routine.

Dynatron®850plus & 550plus
3
Treatment Options
The following modalities are provided by both the Dynatron 850plus and the Dynatron
550plus:
Interferential Therapy: This traditional therapy, delivered with two channels and
four electrodes, also includes Dynatronics’ patented Target feature for easy location
of the treatment site and delivery of the full interferential beat where it is needed.
You can select the high frequency range, the low frequency range, or both, along
with Target. Or select Sweep when you want to deliver the current over a more
general area. You can also customize the frequency settings for individual treatments
or save a unique default setting.
Premodulated Therapy: Ideal for treating areas where four electrode-placement is
not practical, this modality extends the versatility of the device by offering a
premodulated interferential current using one channel and two electrodes.
Biphasic Stimulation: This option provides muscle stimulation using a sinusoidal
biphasic waveform with pulse widths, ranging from 50 to 400 microseconds. It
offers normal, co-contraction and reciprocal contraction modes, selectable on/off
cycle times and ramp times, and customizable pulse rate and pulse width.
Russian Stimulation: With this modality, you can deliver muscle stimulation
treatments selecting from an array of options including normal, co-contraction and
reciprocal contraction, selectable on/off cycle times and ramp times, and
customizable pulse rate and pulse width.
High Voltage Pulsed Stimulation: This traditional electrotherapy modality offers a
pulsed, monopolar current with pulse widths in the microsecond range and pulse rates
ranging from 1 to 200 Hz utilizing a twin-peak monophasic waveform. Polarity,
on/off cycle time, and ramp time are selectable, and pulse rate may be customized for
each treatment. Treatment may be delivered using either electrodes or optional
probes.
Microcurrent Therapy: Microcurrent treatment may be delivered using two
electrodes for unattended therapy, or the optional hand-held probes for manual
treatment. You may select the desired polarity and customize the frequency and
intensity. An audible tone allows you to monitor conductance.
The following additional modalities are provided with the Dynatron 850plus (not included
with the Dynatron 550plus):
Ultrasound Therapy: The Dynatron 850plus includes Dynatronics’ patented multi-
frequency ultrasound capability. Soundheads are available in 1 cm2, 2 cm2, 5 cm2,
and 10 cm2sizes. Each soundhead offers 1, 2, and 3 MHz. (The 1 cm2soundhead
offers 2 and 3 MHz.) Duty cycle options are 10, 20, or 50 percent, or a continuous
duty cycle.
Combination Therapy - Comboplus™: Dynatronics’ new Comboplus feature gives
you almost unlimited options in setting up a combination treatment with the
Dynatron 850plus. Now you can combine an ultrasound treatment with any single-
channel electrotherapy modality provided by this device, including Premodulated,
Biphasic, Russian, High Volt, or Microcurrent. In addition, combination therapy is

Dynatron®850plus & 550plus
Introduction 4
no longer restricted to just one channel—any channel may be used. This means you
may set up a combination treatment using any of the three electrotherapy output
jacks. Combination therapy offers simultaneous treatment time and allows you to
select from all the available options for both modalities used in the combined
treatment.
Simplified Setup
The unique design of the Dynatron 850plus and 550plus front panels means treatment setup
has never been easier. A few simple key presses are all you need to fully set up a treatment.
The careful grouping of available options for each modality ensures that you can easily see
and select from the appropriate options for that modality.
Each modality offers default settings which are automatically selected when the modality is
selected—saving time in the treatment setup. You can change these defaults to match your
own most common treatment setups to reduce setup time to a matter of seconds.
Before You Treat a Patient
Before administering a treatment to a patient with the Dynatron 850plus or 550plus, you
should familiarize yourself with all the operating instructions for the modality used, as well as
the contraindications, warnings, and precautions for that modality.
You should also read in this manual general information about each of the modalities. In
addition to the information provided in this manual, consult other published sources for
additional application and safety instructions regarding use of each type of therapy.
How to Use This Manual
This manual is organized to help you learn how to use your Dynatron 850plus and 550plus
device, and to provide easy reference for looking up specific instructions or information. The
information in the manual is grouped as listed below. Note that all treatment instructions for all
modalities are in one section, and that all contraindications, warnings, and precautions for all
modalities are provided together in another section.
This grouping of information makes it easy for you to find what you are looking for. To assist
you further, descriptive titles appear at the foot of each page to help to identify immediately
what section you are in. Familiarize yourself with the organization and presentation of this
manual to make best use of the information provided.
Section I: Introduction, Installation and Features
Section II: Operation and Treatment Instructions
Section III: General Modality Information
Section IV: Contraindications, Warnings, and Precautions
Section V: Ultrasound Technical Information
Section VI: General Technical Information
Section VII: Patient Information

Dynatron®850plus & 550plus
Installation & Features
5
Installation and Features
Unpacking
When you receive the unit, immediately unpack it and all accessories and check for possible
damage, obvious or concealed. In case of damage, immediately notify the carrier and take
any steps necessary to file a claim for the damage sustained. Do not destroy the shipping
carton. The carton should be reused if the device must be shipped for any reason. The carton
is specially designed to protect the unit from shipping damage. Improper packaging of the
unit during transport can result in damage and invalidate the warranty.
Complete the warranty registration form and return it to Dynatronics within 10 days of
purchase. This is essential to insure you are not billed for services that are covered by
the warranty policy. Warranty registration should include serial numbers for both the
device and soundheads.
Connect the AC power cord, which is equipped with a hospital grade, UL listed plug, to a
properly grounded 110/120V 60 Hz AC outlet (the device will automatically switch to
220/240V 50 Hz when connected to a power source with that voltage). The power cord must
also be firmly plugged into the device itself. When the cord is properly connected, it can not
be easily pulled out. Do not place the cord or the device in a place where the cord could be
tripped over or accidentally pulled out of its socket during a treatment.
Read the operating instructions in this manual before proceeding with a treatment.
Standard Accessories
The following accessories are included with the Dynatron 850plus or 550plus units:
Qty Part No. Description
1 D851/ D551 Dynatron®850plus or Dynatron®550plus unit
1 9B0031 Power Cord
1 8A0061 Patient Remote Stop Cable
1 8H0006 Operator's manual
2 7B0230/ 7B0231 72” double leads (1 red, 1 black)
1 7B0234 Special lead wire for combination treatments (with Dynatron
850plus only)
1 7B0204 POLYS™ self-adhesive electrodes 1.75” x 3.75” w/pin
connector (pkg of 4)
4 7B0063/ 7B0065 3” round carbon electrodes (2 red, 2 gray)
4 7B0191 Sponge fabric for use with carbon electrodes
2 DW248 2” x 48” straps
1 7B0191 5” x 8” dispersive electrode for high volt w/ sponge fabric
1 7B0202 Applications manual
1 7B0217 Ultrasound gel sample (with Dynatron 850plus only)

Dynatron®850plus & 550plus
Installation & Features 6
Soundheads and Probes
The Dynatron 850plus may be purchased with one or more applicator soundheads in the
following sizes:
Part No. Size Frequencies
SH01CM 1 cm2Operates at 2 and 3 MHz
CM02SH 2 cm2Operates at 1, 2, and 3 MHz
CM05SH 5 cm2Operates at 1, 2, and 3 MHz
CM10SH 10 cm2Operates at 1, 2, and 3 MHz
An optional high volt probe or microcurrent probe may also be purchased for use with this
device. Contact your Dynatronics dealer to order optional accessories
Accessories
The following optional and replacement accessories may be purchased from Dynatronics or
from your Dynatronics dealer:
Part No. Description
8E0026 High volt probe (requires one or more applicators)
8E0017 High volt applicator 2” round
8E0018 High volt applicator 5/8” round
8E0019 High volt applicator 2”x1-1/2”
8D0007 Microcurrent active probe
8D0027 Microcurrent ground probe
7B0208/ 7B0209 2” diameter carbon electrodes (red and gray)
7B0063/ 7B0065 3” diameter carbon electrodes (red and gray)
7B0059/ 7B0061 3” x 5” carbon electrodes (red and gray)
7B0067/ 7B0069 1.5” x 2.0” carbon electrodes (red and gray)
7B0003/ 7B0203 1.75” x 3.75” adhesive electrodes (with snap or pin connector)
7B0005/ 7B0204 1.75” square adhesive electrodes (with snap or pin connector)
7B0205 1.25 round adhesive electrodes (with pin connector)
7B0206 2” round adhesive electrodes (with pin connector)
7B0207 3” round adhesive electrodes (with pin connector)
7B0139 120” lead (black)
7B0141 120” lead (red)
7B0077 Bifurcated extension lead wire
7B0081 Banana-to-pin adapter
7B0001 Snap adapter
7B0161/ 5LTRGEL Ultrasound coupling gel (8 oz.bottle or 5 liter container)

Dynatron®850plus & 550plus
Installation & Features
7
POWER-INTENSITY
TIME START
STOP
HI VOLT
+
-
PREMOD
IFC
BIPHASIC
CO-CONT
NORMAL
RECIP
.5 RAMP
1.0 RAMP
1.5 RAMP
2.0 RAMP
HIGH
LOW
TARGET
SWEEP
CH 1 CH 2
MICRO
+
-
RUSSIAN
COMBO
SOUND
1 MHz
2 MHz
3 MHz
10/10
10/30
10/50
CONT
10%
20%
50%
CONT
HV
TARGET
PAUSE
WIDTH
RATE
FREQ
TIME
SOUND
MICRO
HV
2
1
FUNCTION
64
758
9123 10 11
14
13
12
16
17
18
21
19
22
20
23
24
261525
CH
Dynatron 850plus Control Panel
Dynatron 850plus and Dynatron 550plus Physical Features
Before operating the Dynatron 850plus or Dynatron 550plus, acquaint yourself with the
control panel by reviewing the illustrations and descriptions on this and the following pages.
The numbered features in the diagrams correspond to the numbered descriptions. Before
administering treatment to a patient, read the sections later in this manual that provide
specific instructions for performing treatments, discussions of each modality, definitions of
the available options, along with contraindications, warnings, and precautions for all
modalities.
Note that some options use “toggle” keys for making selections. More specific instructions
for using toggle keys are provided later in this section.
General Selections:
1. START: Pressing this key starts the treatment timer, and treatment proceeds as set up.
2. STOP: Pressing this key during a treatment IMMEDIATELY stops the output and sets
the treatment time to zero for all modalities. Treatments may also be stopped by pressing
the button on the patient REMOTE STOP cable. You can also stop a treatment for one
treatment only by pressing and holding the Function

Dynatron®850plus & 550plus
Installation & Features 8
POWER-INTENSITY
TIME START
STOP
HI VOLT
+
-
PREMOD
IFC
BIPHASIC
CO-CONT
NORMAL
RECIP
.5 RAMP
1.0 RAMP
1.5 RAMP
2.0 RAMP
HIGH
LOW
TARGET
SWEEP
CH 1 CH 2
MICRO
+
-
RUSSIAN
10/10
10/30
10/50
CONT
HV
TARGET
WIDTH
RATE
FREQ
TIME
MICRO
HV
2
1
FUNCTION
64
758
9123 10 11
14
13
12
21
19
22
20
23
24
261525
Dynatronics
CH
Dynatron 550plus Control Panel
key while you press the Stop key, or by reducing that channel’s treatment time to zero.
3. PAUSE/FUNCTION: This key is used in combination with other key presses for
accessing unique features including: select polarity (high volt and microcurrent), audio
volume control (microcurrent), and to stop one treatment only. Specific instructions for
using this key are provided later in this manual.
For Dynatron 850plus only: This key is also used to pause an ultrasound treatment. First
press the channel toggle (CH) to select SOUND, then press PAUSE/FUNCTION; the
ultrasound output is stopped, the treatment time is paused, and the light on the Pause key
is on. When this key is pressed again, the ultrasound treatment resumes and the light on
the Pause key is off. The PAUSE option is not available with the Dynatron 550plus since
that model does not offer ultrasound. NOTE: During a Combo treatment, only the
ultrasound output and the treatment timer are stopped when you press Pause; the stim
output continues.
4. TIME ARROW KEYS: These UP/DOWN arrow keys are used to increase/decrease the
treatment time or other parameter that is displayed in the Time display.
5. TIME DISPLAY: This display is used to show the treatment time for one treatment at a
time; the display shows treatment time for the selected channel (the selected channel is
indicated by the green LED—all other channels in use at the

Dynatron®850plus & 550plus
Installation & Features
9
time will have yellow LEDs). The Time display can also display the pulse rate and width
for Russian and biphasic treatments, as well as the frequencies for interferential,
premodulated, and microcurrent treatments, and pulse rate for high volt. The treatment
parameters for any treatment in progress may be displayed at any time by first using the
channel toggle key to choose the desired channel then using the Time toggle key to select
the desired parameter (Time, Freq, Rate, Width).
6. CHANNEL TOGGLE KEY(CH): When a treatment is in progress, you can press this
key to choose an output channel and display the parameters for the treatment being
delivered by that channel. When a channel light is GREEN, the displays show the
settings for that channel. The available options depend on the modality selected. When
two or more treatments are in progress simultaneously, the toggle key is used to select the
channel you wish to view.
7. CHANNEL SELECTIONS: These lights indicate which output channels are currently in
use. A solid GREEN light indicates current is being delivered to that channel; the time,
intensity and other treatment parameters for that channel are also displayed. A solid
YELLOW light indicates a channel is in use and delivering current, but the time, intensity,
and treatment parameters are not displayed at this time (only one channel’s time and
intensity may be displayed at a time). Flashing green or flashing yellow indicate the “off”
segment of a biphasic, Russian or high volt treatment cycle. The channel’s intensity and
other treatment parameters may only be modified when it has a green indicator light. Press
the Channel Toggle key (CH) to select a channel to be viewed.
8. TIME TOGGLE KEY: Press this key to display various treatment parameters in the
Time display including Time (treatment time), Freq (frequency), Rate (pulse rate), and
Width (pulse width). Available options during a given treatment or treatment setup
depend on the modality selected.
9. TIME GROUP SELECTIONS: These lights indicate the parameters that are displayed
(one at a time) in the Time display. The default selection is the treatment time. Press the
Time toggle key to select the desired option (available options depend on the modality
selected). When a parameter is selected, its indicator light is green, its value is displayed
in the Time display above, and the time arrow keys may be used to change the value.
The device returns to the Time display after 10 seconds with no key presses.
10. POWER-INTENSITY DISPLAY: This display is used to display the treatment power (for
ultrasound) or intensity (for all other modalities) for the currently selected channel (the
selected channel is indicated by the green LED—all other channels in use at the time will
have yellow LEDs). Press the channel toggle key to select the desired channel to be
viewed.
11. POWER - INTENSITY ARROW KEYS: The arrow keys are used to increase/decrease
the intensity or power of one treatment. Changes made to power and intensity affect only
the currently selected channel (the selected channel is indicated by the green LED—all
other channels in use at the time will have yellow LEDs). Press the channel toggle key to
select the desired output channel. The arrow keys may then be used to change the
intensity or power for that channel.

Dynatron®850plus & 550plus
Installation & Features 10
IFC / Premod Selections:
12. IFC/PREMOD: Press this key once to begin setup of an interferential treatment (the IFC
LED is lighted); press this key twice to begin setup of a premodulated treatment (the
Premod LED is lighted). When you select IFC, both channels 1 and 2 are automatically
selected and the green LED lights for those two channels will be on. Connect two leads
to the output jacks for the channels that are selected. When you select PREMOD, a
single channel (CH1 or 2) is automatically selected and that channel’s green LED will be
on. Connect one lead to the output jack that corresponds to the channel indicated by the
green LED.
13. HIGH/LOW TOGGLE (used with interferential, premodulated and high volt): Press this
key one or more times to select the desired frequency range for interferential and
premodulated treatments or the pulse rate range for high volt treatments. The green LED
indicates the option selected. For example, press the High/Low toggle key once to select
High, press again to select Low, press again to select High/Low Alternating, and press
again to select High/Low Consecutive. For high volt treatments, you can select High or
Low only, but not both. During a treatment, the current sweeps through the range(s)
selected.
For interferential and premodulated, the HIGH frequency range is initially set at 80 to
150 Hz; and the LOW frequency range is 0 to 10 Hz. For high volt, the HIGH pulse rate
range is initially set at 80 to 120 Hz; and the LOW pulse rate range is 1 to 10 Hz. These
frequency ranges may be modified for every treatment, if desired and new default settings
for the device may also be saved. See treatment setup instructions later in this manual for
a complete description of the options that may be selected.
14. TARGET/SWEEP TOGGLE: This key is pressed to select either Target, Target Sweep,
or static treatment for an interferential treatment. The Target pad is used to locate the
exact treatment site (if the Target option is selected during an interferential treatment).
15. TARGET PAD: For use during interferential treatments when “Target” is selected.
Touch the TARGET pad at different points on the pad to reach the precise treatment site.
When you lift your finger from the Target pad, the selected point is locked until you
change it again. This patented feature is used to locate the specific treatment site in an
interferential treatment and to place the point of interference at that point.
Ultrasound Selections (DYNATRON 850plus ONLY—the ultrasound feature is
not available on the Dynatron 550plus):
16. SOUND/COMBO: Press this key once to begin setup of an ultrasound treatment (the
Sound LED on this key is lighted as well as the Sound LED in the channel indicator
area); press this key twice to begin setup of a combination treatment (the Combo LED is
lighted as well as the Sound LED and a single Channel LED in the channel indicator
area). When either of these options is chosen, the soundhead should first be plugged into
the ultrasound output jack on the side panel. For combination treatments, the special
combo lead wire should be attached to the output jack selected (see full instructions for
setting up a combination treatment later in this manual). In the COMBO mode, the
electrotherapy treatment is delivered through the soundhead and through a single
electrode which is placed on the patient. Only single-channel electrotherapy options are
available in the COMBO mode.

Dynatron®850plus & 550plus
Installation & Features
11
17. SOUND FREQUENCY TOGGLE: This key is pressed one or more times to select the
desired ultrasound frequency; 1 MHz, 2 MHz, or 3 MHz.
18. DUTY CYCLE TOGGLE: This key is pressed one or more times to select the desired
duty cycle for ultrasound treatment. Options are 10, 20, or 50 percent, or Continuous.
Russian / Biphasic / High Volt Selections:
19. BIPHASIC/RUSSIAN: Press this key once to begin setup of a biphasic treatment (the
Biphasic LED is lighted); press this key twice to begin setup of a Russian treatment (the
Russian LED is lighted). Biphasic and Russian treatments use a single channel (1 or 2)
when the Normal mode is selected; and a channel pair (1 and 2) when the Reciprocal or
Co-contraction mode is selected.
20. HIGH VOLT: Press this key to begin setup of a High Volt treatment (the Hi Volt LED is
lighted). The HV output channel is automatically selected (the LED for the channel
selected is GREEN). Connect the patient lead wire to the HV output jack.
HIGH VOLT POLARITY: To select or change the polarity of a high volt treatment, use
the HI VOLT key together with the FUNCTION key. Press and continue holding the
FUNCTION key while pressing the Hi Volt key one or more times to select positive only
(the “+” LED is lighted), negative polarity only (the “-” LED is lighted), or both (both
LEDs are lighted).
21. TREATMENT MODE TOGGLE (for biphasic and Russian treatments): Press this key
one or more times to select Normal, Co-Contraction, or Reciprocal contraction. The
output channel is automatically selected. When Normal is selected, one output jack only
is selected (1 or 2). When Co-contraction or Reciprocal is selected, channels 1 and 2 are
selected. Connect the patient lead wire(s) to the output jack(s) for the channel(s)
selected.
22. CONTRACTION/REST CYCLE TOGGLE (for Russian, biphasic, and high volt
treatments): Press this key one or more times to select the desired contraction/rest
(on/off) cycle . Available cycles include 10/10, 10/30, 10/50, and Continuous. The first
value indicates the on-time in seconds, and the second value indicates the off-time. For
example; 10/30 indicates the current is on (muscle is contracting) for 10 seconds, and
current is off (muscle is relaxed) for 30 seconds. With Continuous mode, current is
applied continuously with no off cycle. The continuous duty cycle is not recommended
for electrical muscle stimulation, but may be used for settings that are intended to effect
other results than a muscle contraction.
23. RAMP TIME TOGGLE (for Russian, biphasic, and high volt treatments): This key is
pressed to select the ramp time . The ramp time is applied before and after the “On”
segment of the cycle (it provides both a ramp up and a ramp down). Available ramp
times are .5, 1, 1.5, and 2 seconds.
NOTE: The High/Low option described previously under the Interferential/Premod options,
is also used for High Volt treatments (see item 13 above).

Dynatron®850plus & 550plus
Installation & Features 12
Microcurrent Selections:
24. MICRO: Press this key to begin setup of a microcurrent treatment. This key is also used
to turn the conductance tone off and on after a microcurrent treatment is started. When
MICRO is selected, Channel 1 is automatically selected for the default electrodes
treatment and the LED for that channel is lighted. For a microcurrent treatment setup
with electrodes, connect a patient lead wire to Channel 1 output jack. For a microcurrent
probes treatment, press the channel toggle key (CH) to select the MICRO channel
selection (Channel 1 LED will become yellow and MICRO will become green to indicate
the probes option is selected). Connect the microcurrent probe to the microcurrent output
jack on the left side panel of the device.
NOTE: Channel 1 is committed to the microcurrent output during a probes treatment as
well as during a treatment with electrodes, and is not available for use by any other
modality while any microcurrent treatment is in progress.
MICROCURRENT POLARITY: To select or change the polarity of a microcurrent
treatment, use the MICRO key together with the FUNCTION key. Press and continue
holding the FUNCTION key while pressing the MICRO key one or more times to select
positive only (the “+” LED is lighted), negative polarity only (the “-” LED is lighted), or
dual polarity (both LEDs are lighted).
25. OUTPUT JACK CHANNELS 1 and 2: These are the output jacks for delivering
interferential, premodulated, Russian, biphasic, and microcurrent treatments. Consult
treatment instructions later in this manual for appropriate channels and treatment setup
for each modality.
26. HIGH VOLT OUTPUT JACK HV. This is the output jack for delivering high volt
treatments. Consult treatment instructions later in this manual for high volt treatment
setup.
Dynatron 850plus and
550plus Back Panel:
27. POWER ON/OFF
SWITCH: Located on the
back of the unit this switch
is labeled “1” and “0”. Set
the switch to “1” for ON;
set the switch to “0” for
OFF.
28. STIM INPUT JACK FOR
COMBINATION
TREATMENTS: The special
lead wire for combination
treatments is plugged into this
jack for a combination
treatment setup providing stim output through the ultrasound head. The special lead wire is
also plugged into the jack on the front of the device which has been selected for the specific
combo treatment. See combination treatment instructions later in this manual for detailed
information regarding combination treatment setup.
1
0
Batt. Input
28. Electrical Stim to Ultrasound
Input Jack (only on D850plus)
29. Jack for Optional Battery Pack
27. Power On/Off Switch
30. Patient Remote Stop Jack
Dynatron 550plus and 850plus Back Panel