Chattanooga Intelect Legend Service manual

CHATTANOOGA

®

GROUP INC.

Intelect

P.N. 78343 Rev. A

Legend Series

Service Manual

I NEED TO KNOW . . .

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Warranty Information ..............................3

How the unit works..................................6

What might be wrong with my unit......25

What the error messages mean ...........26

Special Key Combinations....................27

CHATTANOOGA

GROUP INC.

How to calibrate the unit.......................38

How to open the unit ...............................9

How the boards interconnect ...............36

Where the connectors are.....................11

What the signals are..............................11

Part numbers..........................................46

How to get service help...........................3

How to close the unit...............................9

Technical Specifications.......................43

First look on this page to quickly find where to go in the manual
for more information !

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GROUP INC.

Intelect® Legend Two Year Limited Warranty

The Chattanooga Group Inc. (“Company”) warrants that the Intelect® Legend
Ultrasound or Stim (“Product”) excluding accessories is free of defects in material and
workmanship.

This warranty shall remain in effect for two (2) years from the date of the original
consumer purchase of this and extends to any owner of the product during the warranty
period. Accessories that are included as standard with the product (as listed in the user’s
manual) are warranted for 90 days. Ultrasound applicators 2cm
warranted for one (1) year. If this product fails to function during the two year warranty period
because of a defect in material or workmanship, the company or the selling dealer will replace
or repair this product without charge within a period of 30 days from the date on which the
defective product is returned to the company or dealer. The company or the dealer will ship
the replacement or the repaired product to the owner.

All repairs must be performed by a service center authorized by the Chattanooga
Group, Inc. Any modifications or repairs performed by unauthorized centers or groups will
void this warranty. To participate in warranty coverage, the product’s warranty registration
card (included with the product) must be filled out and returned to the Chattanooga Group,
Inc. by the original owner within 10 business days of purchase.

This warranty does not cover:

Replacement parts or labor furnished by anyone other than the Company, the dealer
or an approved Company service agent.

Defects or damage caused by labor furnished by someone other than Company, the
dealer or an approved Company service agent.

Any malfunction or failure in the product while it is in the possession of the owner
during the warranty period if the malfunction or failure is not caused by a defect in material or
workmanship or if the malfunction or failure is caused by unreasonable use, applications in
which the product was not intended or the failure to provide reasonable and necessary
maintenance.

The Company shall Not be Liable for Incidental or Consequential Damages.

To Obtain Service:

From Company or the selling dealer under this warranty, the owner must do or abide
by the following:

• A written claim must be made within the warranty period to Company or the
selling dealer.

• If the claim is made to the Company, the written claim should be sent to:

Chattanooga Group INC.
Australian Warehouse
Dingley Victoria 3172
Phone: [phone]
Fax: [phone]

• The product must be returned to Company or the selling dealer by the owner.

This warranty gives you specific legal rights, and you may also have other rights

which vary from state to state.

The Company does not authorize any person or representative to create for it any
other obligation or liability in connection with the sale of the Product. Any representation or
agreement not contained in the warranty shall be void and of no effect.

2

, 5cm2 or 10cm2 are

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GROUP INC.

Start Here

About This Manual

This manual is intended to cover the Intelect® Legend Ultrasound and
Stim units and their accessories only.

The purpose of this service manual is to give a qualified technician
enough information to troubleshoot problems to the board level. Because of
the complexity and construction of these boards it is not recommended that
problems be traced to the component level. Some problems may be due to a
misunderstanding of how the machine operates. Thus it is important to read
the operators manual first to gain familiarity with how the machine operates
under normal circumstances.

Since this service manual is intended to assist in isolating the problem
to a circuit board, we will not cover the functions performed on each board in
detail.

This manual presents a brief theory of operation of each board and
accessory in the unit. It contains a troubleshooting guide for common
problems. This guide is not meant to cover every possible problem that a
service technician might encounter, but rather to give examples of what may
be seen. The manual also contains diagrams of the connector layout of each
board, a system diagram of how the unit is wired, and a list of signals carried
on each wire. Also included are calibration procedures for the unit, parts lists
and information on obtaining service.

Important !

The specifications and information put forth in this manual were in
effect at the time of publication. However, owing to Chattanooga Group’s
policy of continuous improvement, changes to these may be made at any time
without obligation on the part of Chattanooga Group, Inc.

Specifically, as there are improvements made to the circuit boards in
these units the connector

names may change. However, the location and

function of the connector will not likely change. Use reasonable judgment

and contact Chattanooga Group when in doubt.

Chattanooga Group, Inc., obviously cannot be responsible for work
performed on their units by individuals or other companies not approved or
authorized to perform service on Chattanooga Group equipment. Always try
to resolve any problems through your dealer or Chattanooga Group’s
customer service department FIRST.

Please read and understand the following precautions before
using or servicing a unit.

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PRECAUTIONARY INSTRUCTIONS

As with any electrical device, use extreme caution while working
inside the devices. Some of the circuits produce high voltages which

may be accessible while servicing the unit. Be especially mindful of jewelry
and tools that may accidentally come in contact with components inside the
unit.

Most of the electronic components incorporated in the unit are
electrostaticly sensitive. Always wear a static grounding strap and work

on a static dissipative surface.

CAUTION: Read, understand and practice the precautionary and

operating instructions contained in the unit’s manual and in this service
manual. Know the limitations and hazards associated with using any
ultrasound device. Observe the precautionary and operational decals placed
on the unit.

CAUTION: Do not operate the Intelect
to any unit other than Chattanooga Group, Inc., devices. Do not operate the
unit in an environment of short-wave diathermy use.

®

Legend Unit when connected

WARNING: Federal Law restricts this device to sale by, or on the order
of, a physician or licensed practitioner. This device should be used only under
the continued supervision of a physician or licensed practitioner.

CAUTION: The ultrasound generator should be routinely checked
before each use to determine that all controls function normally; especially
that the intensity control does properly adjust the intensity of the ultrasonic
power output in a stable manner. Also, determine that the treatment time
control does actually terminate ultrasonic power output when the timer
reaches zero.

CAUTION: Use of controls or adjustments or performance of
procedures other than those specified in the unit’s manual or in this service
manual may result in hazardous exposure to ultrasonic energy.

CAUTION: DO NOT use sharp objects such as a pencil point or ball
point pen to operate the buttons on the control panel as damage may result.

WARNING: Explosion hazard if used in the presence of flammable
anesthetics. The warning symbol for this hazard is prominently displayed on
the cabinet.

WARNING: For continued protection against fire hazard, replace fuses
only with ones of the same type and rating.

WARNING: Make certain that the unit is electrically grounded by
connecting only to a grounded electrical service receptacle conforming to the
applicable national and local electrical codes.

WARNING: This device should be kept out of the reach of children.

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Theory of Operation

Overview

To better understand the details in the following paragraphs, a quick
look at the operation of the entire system is helpful.

The unit is powered by a desktop switching power supply which
accepts 100-240VAC and delivers a regulated 12-16VDC. Each board within
the unit has its own local regulation as required by the particular board
functions.

The user interface consists of the membrane switch panel on the top of
the case and the LCD parameter screen for the Stim unit or LED displays for
the Ultrasound unit. Choices presented on the LCD screen are selected via
the membrane switches for the Stim unit while selections are made directly
from the membrane switches and reflected in the LED displays on the
Ultrasound unit. After a treatment is started on the Stim unit, the LCD screen
returns to a display showing the status of the outputs. The LED displays
constantly reflect the status of the Ultrasound unit. Alarms and feedback of
keypresses are provided by a beeper located inside the case.

Connection for the ultrasound applicator and for electrode lead wires
are made to panels on the side of the unit. The rear of the unit has the power
supply input connector, the fuse and the fan.

Accessories supplied with all Ultrasound units include at least one
applicator and ultrasound gel. Stim units have electrode leads and
electrodes.

The Control Boards

• The Ultrasound Control Board

The signals controlling the Ultrasound Generator Board are carried
through a 40 conductor cable from JP5 on the Control Board to J1 on the US
Generator Board. Refer to the signal list. The signals include address and
data lines, handshake lines and power supply controls.

Connector JP6 is for the membrane switches. JP1 is the power supply
connector and supplies power from the desktop power supply.

JP2 is the output power connector for the Ultrasound Generator Board.

JP4 supplies power to the fan and JP3 is for the beeper.

• The Stim Control Board

The signals controlling the Stim Board leave JP7 on the Control Board
and go through a 40 conductor cable to JP1 on the Stim Board. See the
Signal List for details. Signals include address and data lines, handshake
lines, and power supply control signals.

Connector JP4 is for the LCD screen. It is mounted directly behind the
board and against the front panel. JP9 carries power for the
electroluminescent backlighting.

Connector JP10 is for the membrane switches. JP1 is the power
supply connector and supplies power from the desktop power supply.

JP2 is the output power connector for the Stim Board.

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JP3 supplies power to the fan and JP6 is for the beeper.

The Stim Board

The Stim Board’s function is to generate various output waveforms
under the direction of the Control Board. Due to the variety of waveforms
commonly used in electrotherapy, there are different waveform generators on
the board, all controlled by a common Digital Signal Processor (DSP).

• The Sine Wave Generators

There are two of these on each Stim Board, one for channel 1 and the
other for channel 2. Each is identical except for their connections to the
output jacks. Under control of the DSP, Programmable Array Logic (PAL)
devices generate a driving signal which is fed to an amplifier. The output
amplitude of the amplifier is determined by a programmable power supply,
also controlled by the DSP. The resulting output is filtered and routed by
relays to the appropriate connector on the board.

These same generators are used to develop the VMS, or Biphasic
output, the Premod output, the Interferential output and the Russian output.

• The Hi-Volt Generator

The Hi-Volt output is only available from channel 2 of the unit. Under
control of the DSP, timing information is generated by a PAL. This is used to
control the charging and discharging of a transformer. The discharges are
routed through relays to obtain the proper polarity and connect them to the
proper output connector on the board.

JP2 on the Stim Board determines whether the board operates as
channels 1&2 or 3&4 on a CPS 400. This jumper

must be set for channels
1&2 for the unit to operate properly. See the board drawing in the Signal Lists
section for jumper configuration.

The Ultrasound Board

The Ultrasound Board uses a Phase Locked Loop (PLL) that is set by a
PAL based on control by the Control Board to generate a stable high
frequency signal. This signal is used to drive an amplifier whose output is
filtered and drives the transducer. The amplitude of the amplifier output is
determined by its programmable power supply. Other circuitry monitors the
temperature of the transducer as well as voltage and current of the drive to
the transducer.

The Ultrasound Board is controlled by signals from connector JP5 of
the Control Board that are carried through a 40 conductor cable to J1 on the
Ultrasound Board. The signals consist of address and data lines as well as
handshake lines. There are also signals for turning off the power supplies on
the Ultrasound Board when it is not generating output.

The power for the Ultrasound Board is through J2. Connector J3 is the
output of the Ultrasound Board which ultimately drives the transducer in the
applicator.

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The Ultrasound Applicator

The Ultrasound Applicator comes in several models, depending on the
surface area of the transducer and the shape of the face of the transducer.
The circuitry within all of them is the same.

Connection to the Applicator is through a triaxial cable. The center
conductor carries the drive to the transducer while the inner shield is the
return. The outer shield is used to monitor the transducer temperature using
a thermistor inside the Applicator.

A small circuit board inside the Applicator holds components for
transducer temperature sensing and the memory device. The memory device
stores the frequency and power information for the transducer. The memory
device communicates via the two shields of the cable.

The Membrane Switch Panel

The membrane switch panel connects to JP6 on the Ultrasound Control
Board and JP10 on the Stim Control Board. The switches are electrically
arranged such that one side of all the switches have a common return. The
other side of the switches are brought out individually to the connector. The
switch activations are buffered and latched on the Control Boards.

The LCD Parameter Screen

The LCD parameter screen mounts between the Control Board and the
top of the case. The interface between the LCD and the Stim Control Board’s
JP4 is a bi-directional 8-bit bus along with handshake signals. There is a
separate connection via JP9 for supplying power to the electroluminescent
backlight of the LCD. There is a module mounted on the Control Board which
generates the necessary voltage for this.

The LED Interface

The LED displays mount on the solder side of the Ultrasound Control
Board so as to show through the overlay on the case. They are soldered
directly to the board and therefore are not replaceable.

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General Service Procedures

Preventing damage to the case

The plastic case of the Intelect units is quite durable, as are the
membrane switch overlays. To remove the screws and open the case for
servicing it will be necessary to place the unit upside down. Be sure the work
surface is covered so that the unit isn’t scratched. Also be careful with tools
that may scratch the case or overlays.

Location of screws

There are 6 screws that hold the case together and all of them are
accessible from the bottom of the unit. These screws are distinguished from
others on the bottom in that they are all recessed into the plastic case.
Remove all 6 screws.

Opening the Case

Flip the unit back over and carefully lift the top of the case off the
bottom. The top of the case can be opened from the left and put on the right
side of the bottom without disconnecting the cables. If you do need to remove
any cables, NOTE THE ORIENTATION of these cables BEFORE unplugging
them because pin 1 is not marked on all the PC Boards. Mark the cable or
connector and the board before unplugging with a permanent marker, tape or
other means if you need to. You will also need to make note of which small 2­wire connector is for the fan and which is for the beeper. If these become
swapped when assembling the unit, the beeper will sound continuously
whenever the power is on.

Special Tools

Almost any operation can be performed without any special tools. If
you need to replace the EPROMs or PALs on any of the boards, you

MUST
use a special tool to remove the parts. Attempting to remove these IC’s in
any other way can damage the socket and make the entire circuit board
unusable. The preferred tool is Burndy QILEXT-1, sold by Newark Electronics
as type 290N, P/N 95F3004.

Closing the case

Re-assemble the unit taking care to properly install any cables you may
have disconnected. When lowering the top down onto the bottom, be careful
not to capture any wires in the edge of the case. If you are having difficulty it
may be necessary to align one side of the case and then force the other side
to align. Also notice that the metal plates on either side must align with plastic
structures inside the case. After all this work look around the edge of the case
one last time to be sure everything looks OK. Now the back panel may have
fallen into the cabinet while aligning the top and bottom - don’t panic.
Carefully lift the rear edge of the top just enough to allow you to pull the panel
back into its slot in the top and bottom of the case.

Hold the unit together and flip it over (once again be sure the table is
covered so that the case isn’t scratched) and put the 6 screws back in place.
Don’t overtighten the screws, tighten them just until the edges of the case
seat together.

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Signal Lists

®

Intelect

Ultrasound Control Board

Below is a simple drawing showing the approximate locations of the
connectors and the position of pin 1 on each connector.

JP1

Legend US Control

PIN 1

JP2

CHATTANOOGA

GROUP INC.

PIN 1
PIN 1

PIN 1

JP3

JP5

JP4

PIN 1

PIN 1

JP6

Below are tables showing the signals for each connector on the Control
Board. The columns are arranged as pin number, signal description, type of
signal and any other notable information about the signal.

JP1 US Control Board

Pin # Signal Name Type

1 Battery In Power Unused
2 Battery In Power Unused
3 Power Supply In Power +8 to +18 VDC
4 Power Supply In Power +8 to +18 VDC
5 Ground
6 Ground

JP2 US Control Board

Pin # Signal Name Type

1 Power Out Power +8 to +18 VDC
2 Power Out Power +8 to +18 VDC
3 Ground
4 Ground

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JP3 US Control Board

Pin # Signal Name Type

1 Unregulated Power Power +8 to +18VDC,

Current Limited

2 Buzzer On Output Open Collector, Active

Low

JP4 US Control Board

Pin # Signal Name Type

1 Unregulated DC Power 8-18VDC
2 Fan On Output Open Collector, Active

Low

JP5 US Control Board

Pin # Signal Name Type

1 Ground
2 US Data Line 0 Bi-Directional Digital
3 Ground
4 US Data Line 1 Bi-Directional Digital
5 Ground
6 US Data Line 2 Bi-Directional Digital
7 Ground
8 US Data Line 3 Bi-Directional Digital
9 Ground
10 US Data Line 4 Bi-Directional Digital
11 Ground
12 US Data Line 5 Bi-Directional Digital
13 Ground
14 US Data Line 6 Bi-Directional Digital
15 Ground
16 US Data Line 7 Bi-Directional Digital
17 Ground
18 No Connection
19 Ground
20 US Address Line 0 Output Digital
21 Ground
22 US Address Line 1 Output Digital
23 Ground
24 No Connection
25 Ground
26 No Connection
27 Ground
28 No Connection
29 Ground
30

31 Ground

US Strobe

Output Digital Active Low

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32 US Board Enable Output Digital Active Low
33 Ground
34 US Read/Write Output Digital Active Low
35 Ground
36 No Connection
37 Ground
38 US Power Down 1 Output Digital
39 Ground
40 US Power Down 2 Output Digital

JP6 US Control Board

Pin # Signal Name Type

1 Ground
2 Switch 0 Input Digital Active Low
3 Switch 1 Input Digital Active Low
4 Switch 2 Input Digital Active Low
5 Switch 3 Input Digital Active Low
6 Switch 4 Input Digital Active Low
7 Switch 5 Input Digital Active Low
8 Switch 6 Input Digital Active Low
9 Switch 7 Input Digital Active Low
10 Switch 8 Input Digital Active Low
11 Switch 9 Input Digital Active Low
12 Switch 10 Input Digital Active Low

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Intelect

®

Legend Stim Control Board

Below is a simple drawing showing the approximate locations of the
connectors and the position of pin 1 on each connector.

CHATTANOOGA

GROUP INC.

Below are tables showing the signals for each connector on the Control
Board. The columns are arranged as pin number, signal description, type of
signal and any other notable information about the signal.

JP1 Stim Control

Board

Pin # Signal Name Type

1 Battery In Power Unused
2 Battery In Power Unused
3 Power Supply In Power +8 to +18 VDC
4 Power Supply In Power +8 to +18 VDC
5 Ground
6 Ground

JP2 Stim Control

Board

Pin # Signal Name Type

1 Power Out Power +8 to +18 VDC
2 Power Out Power +8 to +18 VDC
3 Ground
4 Ground

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