B Braun Horizon NXT User manual

Horizon

Nxt®

Service

Manual

HORIZON

Modular

Service

Infusion

B.

Braun

June

950500

Nxt®

System

Manual

2000

Rev

E

‘950500

Rev E (06/00)

Horizon

Nxt®

Service

Manual

АН

rights

transmitted

including

photocopying

retrieval

reserved.

in

any

system,

except

Copyright

Printed

Copyright

No

part

form

or

by

and

recording,

as

may

Act

or

in

the

United

1997

of

this

any

means,

be

expressly

in

writing

States

by

book

or

B.

by

by

of

Braun

may

be

reproduced

electronic

any

or

information

permitted

B.

Braun

America.

or

mechanical,

storage

by

the

and

1976

ii

950500

Rev E (06/00)

Horizon

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Service

Manual

Manual

Date

1/97

5/98

1/00

4/00
6/00

Revision

History

Rev

Letter

A

B

C

D

E

Table

Add

1:

Description

Change

Change

Tighten

caution

regarding

Initial

company

Battery

Solenoid

of

Revision

Release

name

to

B.

Braun

Charging

electromagnetic

Reference

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950500

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‘CONTENTS

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CHAPTER

CHAPTER

CHAPTER

1.0

2.0

3.0

INTRODUCTION

¡NINAS

1.2

WARRANTY

1.3

INTENDED

AAA

....

USE...

DESCRIPTION

2.1

VISUAL

2.2

SPECIFICATIONS

RECOMMENDED

3.1

RECEIVING

3.1.1

3.1.2

3.1.3

3.1.4

3.1.5

3.2

CHECK-INPROCEDURE.......................

INDICATORS

ii

RECEIVING

NOTICES

Damaged

Goods
Late

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Receiving

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Shipments.........

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2-5

3-1

3-1

3-1

CHAPTER

4.0

3.3

MECHANICAL

3.3.1

3.3.2

3.3.3

3.3.4

3.4

MAIN

3.5

DEFAULT

3.6

SIMULATED

3.6.1

3.7

VOLUME

3.7.1

3.8

ELECTRICAL

3.8.1

THEORY

4.1

GENERAL

INSPECTION

Door

Alignment

Inspection...

PoleClamplnspection............................

Switch

Gasket

BATTERY

Test

Test

Test

Inspection
and

SOFTWARE

USE

Procedure:

DELIVERY

Procedure:

SAFETY

Procedure:

OF

OPERATION,

DESIGN

Hardware

CHECK

SETTINGS

AND

Simulated

ACCURACY

Volumetric….….......................

CHECK

Electrical

FEATURES

sens

Inspection...........

AND

CHARGING

irene

PERFORMANCE

Use

CHECK.....................

iii

GENERAL

een

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DESCRIPTION

3-3

3-3

3-3

3-3

„3-3

3-3

3-3
3-4

3-4

4.1.1

Patient

:

Safety...

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CHAPTER

5.0

4.1.2

4.1.3

4.2

FUNCTIONAL

4.2.1

4.2.2

4.2.3

4.2.4

4.2.5

THEORY
Si

POWERSUPPLYBOARDASSY.........................................

5.1.1

3.1.2 5 VoltSuppliy.................

5.2

LEDDISPLAYBOARDASSY.............................

5.2.1

(5.2.2

5.2.3

Ease

of

Operation

Upgradabjlity

.es

DESCRIPTION

Case

Power

Main
Half

Door/Bezel

Main

OF

16

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Door
LED

Key

Panel

Bottom

Supply

Battery

Board...

OPERATION,

Processor

Displays

............

uen,

Supply

Interface

and

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DESCRIPTIONS

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5-1

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5-2

・

5-3

5.2.4

5.2.5

5.2.6

5.3

PRESSURE

5.3.1

5.3.2

5.4

MECHANISM

5.5

MANBOARDASSY......................

5.5.1

5.5.2

5.5.3

5.5.4

5.5.5

5.5.6
A

5.5.8

5.5.9

LCD

LCD
LCD

Contrast

Backight
Module

Voltage....

Sopply

Assÿ..…..

TRANSDUCER

Pressure

Offset,

Transducer

Gain,

and

INTERFACE

Management
Door

Interface

LCD

Interface

IR

Link...

Pump

Processor

Interprocessor

Processor...

Bus

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usines

Communications

CA

Transfer
Temperature

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Controller

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5.6

5.7

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CLEANING

6.1

5.5.13

5.5.14

5.5.15

5.5.16

5.5.17

5.3.18

5.5.19

AIR-IN-LINE

SYSTEM

5.7.1

5.7.2

5.7.3

5.7.4

5.7.5

Voltage

Pressure

Variable

Variable

Time

Audible

References...

Signal

Level

Gain

Of

Day...

Alarms

Overvoltage

BOARD

OPERATION

Power-up........

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State

Run

State

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Keep

Vein

Alarm

State

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RECOMMENDATIONS

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Circuits...

Shifter

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5-16

5-16
5-16
5-16
5-16

emeernne

5-17

5-17

5-18

5-18

e

5-18

5-19

5-20

522

5-22

6-1

CHAPTER

7.0

PREVENTATIVE

7.1

PREVENTATIVE

7.2

EQUIPMENT

7.2.1

Hand

7.2.2

Test

7.23

7.2.4

73

PROCEDURES

7.3.1

7.3.2

7.3.3

7.3.4

7.3.5

7.4

PROCEDURES

Consumables...

Spare

Mechanical
Main
Simulated

Volume
Electrical

MAINTENANCE
MAINTENANCE

REQUIRED

Too!s

iii

Equipment

sise

Parts...

NOT

(6

MONTH)

Inspection...

Battery

Use

Delivery

Safety

REQUIRING

(12

MONTH)

inner

and

Materials..............

REOUIRING

Capacity

and

Performance

Accuracy

Check

AND

PROCEDURES

CASE

DISASSEMBLY

(optional)...

Check

.............

ss

CASE

DISASSEMBLY

REPAIR

ire

seo

on

ena e vena

rei

...................

7-1
7-2
7-2
7-2

7-3

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vete

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0

7-3

rici

7-3
7-4

ui

7-5

7-5

75

REPAR...........................

7.5.1

7.6

DISASSEMBLY

7.6.1

Biomed

Case

Halves

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AND

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8.0

7.6.2

7.6.3

7.6.4

7.6.5

7.6.6

7.6.7

7.6.8

769

76.10

7.6.11

7.6.12

7.6.13

7.1

CALIBRATION,

7.7.1

7.7.2

PARTS

Pole

Clamp

Management

Main

Board

Мана

ВаЧету...............

PoWer

Cooling

Petal

Cover

HalfDoor/BezelAâssembiy.............................................

sn

and

ere

ereta

SupPPHy

Fan

.ee

and

ins

Pump

Main

Processor

Speaker..

EPROMS

and

Fuses........

아 아

„72

7-14

아아

CosmeticBezel.............................................................

LED

Display/LCD

LCD

PCB...

Door

Lever...

ADJUSTMENTS,

Elecironic............................

Mechanical

LISTS,

SCHEMATICS,

Controller

eee

AND

AND

PCBS

SPECIFIC

DRAWINGS

ee

TESTS

7-23

ei

7-24

ーー

7-25

......7-26

CHAPTER

CHAPTER

APPENDIX
APPENDIX

APPENDIX

9.0

10.0

A:
B:

C:

NINA

8.2

ELECTRICAL

SERVICE

9.1

CONTACT

AND

MONITOR

10.1

DESCRTPTTON

10.2

INSTALLATION

10.2.1

10.22

10.2.3

10.3

STORAGE

10.4

TROUBLESHOOTING..................

System

DockingSetUp........................

Disconnecting

Abbreviations
Troubleshooting

Operation

Log.................

COMPONENTS

PERFORMANCE

INFORMATION..

DOCKING

eee

eee

Requirements.

Monitor

AND

MAINTENANCE

and

Symbols.…..................................

Guide

AND

ee

Docking

SCHEMATICS

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VISUAL

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TE

PIGGYBACK

Figure

1.

PRIMARY

2.

Primary

3.

POWER

4.

AC

5.

Battery

6.

HOLD

POWER

PAPA

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Rate

Key

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PIGGYBACK

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Door

AA

Z

=”

Indicator

Indicator

Volume

RUN

Lever

つぐ

Display

Key

RUN

の

Key

τς

em

2-1

950500

Rev E (06/00)

Horizon

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Figure

PRIMARY

Φ

"=="

2-2:

Front

View

(Cont'd.)

POWER

RATE

|

LAC

CI

MUHR

18.0

BATTET

VOLUME

400.0

1000
Minis

€

HOLD]

TO

BE

DELIVERED

oe

RUNC

ALARM]

ML

PRIMARY

|

==

cet

dde

Horizons

Nxt

13.

PIGGYBACK

14.

Piggyback

15.

Data

16.

Piggyback

17.

HOLD

Rate

Keys

Volume

Key

Indicator

Display

Key

Display

18.

MENU

19.

CURSOR

20.

Information

21.

ENTER

Key

Key

Keys

(LCD)

Display

2-2

950500

Rev E (06/00)

Horizon

Nxt®

Service

Manual

Figure

1

Figure

2-3:

2-4:

Right

Rear

View

View

ma

#

SERIAL

===

CAT

COMO

X

У

©

(2

„©

22.

Phillips

23.

Pole

24.

Catalog

25.

Daisy

26.

AC

Power

一

LOCK

+.

Head

Clamp

and

Chain

一

一

OUT

PANEL

Case

Top

S/N

Identification

Outlet

Cord

Door

o

Screw

SERIAL

COMMUNICATION

DATA

r

Bo

|

|

|

27.

PANEL

28.

SERIAL

29.

Quarter-turn Case

30.

Piezo

31.

Main

Alarm

Speaker

LOCK

DATA

OUT

Switch

COMMUNICATIONPort

Top

Screws

Speaker

(Model

610-012)

2-3

950500

Rev E (06/00)

Horizon

Nxt®

Service

Manual

Figure

2 3

2-5:

Front

View,

4

Door

Open

1.

Cassette

2.

Inlet

3.

Refill

4.

Transfer

5.

Petal

6.

Restriction/Outlet

Alignment

Valve

Piston

Valve

Module

Pins

Cover

Valve

7.

Air-In-Line

8.

Anti-Freeflow

9.

Pressure

10.

Tube

Pusher

11.

Spring

2-4

10

Detector

Socket

Transducer

(Free

Flow

Prevention)

950500

Rev E (06/00)

Horizon

2.2

Nxt®

Service

Manual

SPECIFICATIONS

Mechanism:

Dimensions:

Weight:

Power

Grounding

Leakage

Plug:

Pole

Battery:

Requirements:

Resistance:

Current:

Size

Range:

Volumetric
placement

Width
Height
Depth

Approximately

90-132

mestic),

sories

Meets

Meets

AAMI

Hospital

0.75”

to

12

Volt

time

is

of

fluid

(Non

Reservoir

12.4"

(31.5

4.8"

(12.2

12.2”

(31.0

VAC,

180-264

(international)

UL

Standard

or

exceeds

Safe

Current

Grade

1.25”

sealed

dependent

delivery.

Drop-Counting),

cm)

cm)

cm)

11.9

lbs

(5.4

30

Watts,

VAC,

UL

(3

lead-acid

544

Standard

Limits

pin)

on

the

47/63

30

Watts,

battery

state

kg)

Hz

544,

(July

for

of

battery

Positive

excluding
47/63

Hz

Section

9,

1985)

ambulatory

for

excluding

charge

Pressure

accessories

27.2,

each

and

use.

and

Dis-

acces-

ANSI/

device.

Run

the

(do-

rate

Rate

Range:

Keep

Open

Volume

Fluid

Occlusion

Alarms:

Air-In-Line

to

be

Types:

Pressure:

Rate:

Infused:

Alarm:

Standard:

Micro:

3

ml/hr

the

continuation

ml/br

0.1

to

All

standard

75,

100,
default
Both

Air-In-Line,
Open,
Instrument,
Piggyback
System

0.09

(Primary

(Primary

for

prescribed

settings

9999.9

ml

IV.

200,

300,

is

300

mmHg.

defaults

are

Battery

Downstream

Set

Volume,

Alarm,

cc

and

Piggyback)

and

Piggyback)

delivery

of

the

prescribed

fluids,

400,

including

500

and

Micro

user

adjustable.

Very

Low,

Occlusion,

Improperly

Set

Solution

Loaded,

Primary

Alarm

0.1

0.1

rates

of 3 to

delivery

lipids € TPN

750

mmHg.

Mode

default

Container

Hold

Time

Set

Rate,

to

999.9

to

99.9

ml/hr

999.9

rate

-

Standard

is

Empty,

Exceeded,

Piggyback

Set

Primary

ml/hr

for

100

ml/hr,

0.1

to

or

2.9

Mode

mmHg.

Door

Repair

Rate,

Set

Volume,

2-5

«950500

Rev E (06/00)

Horizon

Nxt®

Service

Hold

Manual

Time

Exceeded:

Activated
tivated

if

the

after

three

door

minutes

of

the

pump

without

is

open)

user

interaction

(deac-

Memory:

Permanent

the

Data

Retention

the

Biomed

data

retention

Defaults

Options.

after

the

have

pump

been

is

turned

otherwise

off,

unless

selected

in

2-6

950500

Rev E (06/00)

Horizon

3.0

Nxt®

RECOMMENDED

3.1

RECEIVING

New
tion
numbers,

of

box

Service

Device

will

be

or

failure.

Manual

RECEIVING

NOTICES

Notice:

replaced

preventative

Any

only

maintenance

new

if

the

device

device

tags.

PROCEDURE

that

does

not

is

not altered,

Ifa

device

meet

i.e.

is

factory
hospital
used

specifications
identification

on a patient,

during

markings,

it

will

not

be

in-coming

asset

inspec-

control

considered

an

out

WARNING:

3.1.1

Damaged

Upon
should
age
company.

mediately,

happy
and
forwarded
request
tation

3.1.2

Goods

_

Ifthe
replaced
Section

3.7

and

Horizon
tion
ties.

Goods

receipt,

not

be

or

loss

noted

If

and

to

issue a credit

the

carrier’s

to

must

be

company

Received

product

for

count

is

or

repaired,

3.6

of

this

3.8

prior

Nxt

must

set

sterility

and

accepted.

on

the

damage

request

is

that

for

freight

the

Carrollton,
accompanied
has

properly

in

Error

partially

manual

to

inspect

or

the

unit

and

use

for

be

performed

only.

Failure

your

patient

Identify any
customer’s
discovered

inspection

the

loss

bill

indicating

Texas

copy

after

or

damage,

office

by a delivery

noted

such

completely

must

the

disassembled,

undergo

appropriate

care.

with a set

to

do

so

freight

items

be

before

that

are

of

the

delivery

receipt

made

of

and

and

the

item and

(see

Chapter

receipt

damage

and

pass

calibrations

All

final

performance

that

is

acceptable

may

cause

the

carrier

damaged

document

shipment,

an

inspection

file a claim

quantity

9),

and

or

an

inspection

or

loss.

or a component

all

performance

and/or

testing

for

bodily

or lost,

notify

with

damaged

received

harm

departs.

report

the

Damaged

and

have

by

an

the

transportation

rendered.

carrier,

or

within

agent

report

or

assembly

checks

tests

outlined

and

patient

and

use

will

the

of

providing

not

received

ten

upon

which

has

been

outlined

in

Sections

calibration

with

void

of

an

excep-

all

warran-

merchandise
extent
the

of

the

dam-

transportation

company

B.

Braun

days.

will

your

reque

are

promptly

The

the

transpor-

claim

in

the

im-

be

Items

notified

be

Credit

ordered

returned

will

1.

Proper authorization

2.

Products

3.

Products

4.

Merchandise

Certain

1.

2.

products

Products
Products

(see

Chapter

freight

be

or

shipped

issued

are

in

are

current

has

are

which
whose

in

9),

and

prepaid

for

by

all

has

the

original

inventory

been

shipped

not

eligible

have

been

labels

or

error

may

the

products

the

customer.

returns

been

for

obtained

undamaged

items.

and

for

used.

seals

have

be

returned

are

goods

billed

return

for

been

3-1

to

returned

received

(see

Chapier

cases,

suitable

to

the

credit.

tampered

the

warehouse

within

in

error

9).
for

customer

These

with

are:

or

provided

14

days.

Items

provided:

immediate

by

B.

Braun.

removed.

Customer

ordered

resale.

950500

Service

in

error

is

must

Rev E (06/00)

Horizon

Nxt®

Service

Manual

3.1.3

3.1.4

3.1.5

Except

Late

B.

yond

acts

strike,

Expedited

When
by

in

the

Shipments

Braun

shall

its

or

of

government,

labor

expedited

the

customer,

Receiving

Each

Horizon

ment.
therefore,

your

There

the

(customer)

case

of a B.

be

excused

its

suppliers’

acts

trouble,

Shipments

sabotage

transportation,

an

additional

Inspection

Nxt

Infusion

is,

however,

following

policy,

Braun

from

or

of

error,

any

delay

subcontractors’

purchase

or

priorities

delay

specialized

charge

Pump

the

possibility

inspection

refer

to

the

to

is

factory

is

recommended.

section

items

must

in,

or

control,

or

in

obtaining

services,

cover

the

inspected

of

in-transit

in

this

be

returned

impossibility

freight

of

including,

allocations,

labor,

or

alternate

premium

and

damage

If

functional

chapter

raw

materials,

expense

tested

which

titled

prepaid

performance

but

not

limited

material

shortages,

equipment,

transportation

will

be

added

prior

to

its

final

may

or

may

testing

“CHECK-IN

is

required

PROCEDURE.”

by

the

customer.

due

to

any

cause

to:

acts

of

God,

fire,

flood,

or

transportation.

modes

packaging

to

not

upon

are

specified

the

invoice.

and

be

obvious;

receipt

be-

war,

ship-

by

3.2

CHECK-IN

Prior

manual.

(RMA#).

Before

1.
age.

opening

If

damage

until a representative

for

shipping

to

the

company

.

Remove

Www

Carefully

ping

damage.

.

Make

A

aligned

un

.

Make

.

Check

.

Inspect

.

Make

01d

erwise

manufacturer

sure

sure

sure

damage

is

responsible

the

pump

inspect

the

with

the

there

the

Pole

the

power

the

damaged.

PROCEDURE

to

use,

it

is

recommended

If

the

pump

See

Chapter 9 for

fails

the

shipping

is

present,

of

after

unless

from

the

pump

door

of

the
bezel.
are

no

visible

Clamp

petal

for

cord

for

module

that

to

operate,

information

container,

notify

the

the

the

shipping

shipping

specifically

for

the

repair.

the

shipping

for

dents,

pump

opens

dents,

ease

of

operation.

nicks

or

cover,

the

contact

valve

pump

B.

on

contacting

inspect

freight

carrier

company

container

authorized

carton.

scratches,

and

closes

tears

or

scratches

cuts,

and

the

tips

be

checked-in

Braun

for a Returned

the

it

carefully

immediately,

is

present.

is

opened).

to

do

missing

easily,

plug

for

and

pressure

according

company.

to

assure

(It

is

Do

so

by

the

parts,

or

without

on

the

pump

bent

or

transducer

to

Sections

Materials

the

absence

and

wait

to

difficult

not

to

return

company,

any

other

obvious

binding,

and

membrane

insecure

prongs.

cover

3.3

Authorization

of

obvious

open

the

place

responsibility

damaged

whether

that

panel.

are

not

through

container

equipment

or

not

signs

of

it

is

properly

torn

or

3.8

of

Number

dam-

the

ship-

oth-

this

Each

may

used

pump

have

caused

by

qualified

has

been inspected

some

misalignment.

service

and

personnel

tested

prior

Therefore,

in

the

initial

to

shipment;

the

and

3-2

however,

procedures

routine

outlined

checks

in-transit

in

this

of

the

Horizon

handling

chapter

Nxt

950500

are

Infusion

or

repair

intended

Pump.

Rev E (06/00)

work

to

be

Horizon

3.3

Nxt®

Service

Manual

MECHANICAL

INSPECTION

3.3.1

3.3.2

See

Table

3.3.3

See

Table

3.3.4

Door

Alignment

1.

Make

aligned

2.

The

Pole

Clamp

3-2, # 1.

Switch

3-2, # 2.

Gasket

1.

All

2.

Petal

3.

The
marks.
All

No

Tube
No
Inspect

none

sure

the

with

the

gap

on

each

Inspection

Inspection

and

Hardware

gaskets

module

cover

screws

cracks

pusher

cracks

on

are

in

the

and

cover
the

are

is

the

power

Inspection

door

of

the

bezel.

side

and

The

Inspection

seals

are

securely

and

valve

pressure

tight

and

secure.

present

intact

case

cord

in

the

and

securely

or

handle

for

pump

along

opens

door

the

latch

top

attached.

tips

are

transducer

bezel

or

shall

inner

mounted.

exist.

nicks

or

cuts.

and

closes

allows

of

the

in

place

not

door

Inspect

easily,

the

door

door

and
have

face.

the

without

to

close

is

symmetrical.

in

good

condition.

any

rips,

tears,

plug

for

bent

binding,

and

completely.

punctures

or

insecure

that

it

is

properly

or

indentation

prongs.

3.4

MAIN

All
pump
the

Allow

the
whenever

12

3.5

DEFAULT

A

by

BATTERY

rechargeable

is

no

exception.

battery

battery

be

at

least

in a fully

fully

24

possible.

Horizon®

and/or

SOFTWARE

1.

Set

all

pumps.

2.

Verify

list

of

all

the

contacting

Technical

CHECK

batteries

Therefore,

charged

hours

to

charged

When

Horizon

defaults

Refer

to

that

the

options

in

Support

AND

CHARGING

automatically

it

is

suggested

by

connecting

fully

charge

the

condition,

charging

Nxts

multiple

may

SETTINGS

according

the

pump’s

the

PC

Docking

calendar

Menu

to

your

System,

Services

discharge

that

the

power

battery

the

pump

devices

be

Daisy

Chained

individual

Operation

and

clock

and

the

at

(800)

3-3

when

not

in

before

cord

from a fully

should

attempting

of

the

be

plugged

in a storage

together

institution’s

Manual,

are

set

appropriately.

submenus

627-7867.

use.

The

rechargeable

to

pump

to a hospital

discharged

into a hospital

facility,

for

outlet

needs.

Part

No.

950441,

in

which

they

use

the

pump

grade

condition.

grade

not

in

the

conservation

Use

PC

Docking

for

can

be

battery

In

used

in

for

the

first

electrical

order

outlet.

to

maintain

electrical

vicinity

instructions.

placed,

950500

of

patients,

purposes.

to

program

is

available

Rev E (06/00)

this

time,

outlet

the

Horizon

3.6

Nxt®

Service

SIMULATED

Manual

USE

AND

PERFORMANCE

CHECK

Action

.

Unlock

lever
turn.

down

holding
the

case.

supported
press
ver

the
Press

Equipment

1.

Horizon®

2.

Container

3.

Needle

4.

LV.

5.

AC

3.6.1

Table

pole

1/4

pump

Test

3-2:

the

Pole

clockwise

Attach

on

Release

down

the

the

the

unlocked

the

lever

is

seated

the

by

the

on

turn

counterclockwise

to

lock

Power

Required:

Pump

with

and

pole

or

power

Procedure:

Simulated

Clamp

toward

pump

down,

in

Pole

I.V.

the

the

Key

by

the

to

Pole

position

the

V-block

Clamp.

pole,

pump.

Pole

to

turn

source

LV.

Set

suitable

3ml

Syringe

equivalent

Simulated

Use

Initial

rotating

front

an

LV.

Clamp

use one

Rotate

Clamp.

on

the

of

the

pole

lever.

the

pump

of

the

With

the

hand

the

towards

the

pump.

fluid

in

it

Use

Checkout

Pole

Clamp

pump

by

instrument

Pole

the

1/4

pressing

While

such

pump

now

to

lightly

Clamp

back

Observation

1.

that

le-

of

Verify

onto

Note:

The
HOLD

To

Be

LCD

the

Pole

the

pole.

As

the

open

er,

the

pump

mounted

speaker

will

will

LEDs

Delivered

illuminate

Clamp

on

will

mechanism

Pole

Clamp

will

become

the

I.V.

sound a tone.

illuminate.

columns

and

lever

more

pole.

The

The

Rate

will

display

display:

tightens

is

snugged

securely

BATT

and

and

Volume

values,

firmly

tight-

the

and

Total

Occlusion

Note:

Ifno keys

ly

30

seconds,

the

Primary

is

not

active.

3

min.,

“HOLd”

ume

To

Be

and

the

alarm

Load

the

then

close

Infused = 0.0

Limit = 300

have

been

pressed

“HOLd”

or

Piggyback

If

no

keys

will

flash

Delivered

will

sound.

Set

the

Door.

mmHg

for

will

be

channel,

have

been

in

the

column

950500

ml

approximate-

displayed

whichever

pressed

Primary

of

the

Rev E (06/00)

in

Vol-

LED’s

for

Horizon

Nxt®

Service

Manual

3.

4.

5.

Table

Individually

each

DATA

GYBACK
the

Piggyback

values

Enter a Primary

10.

Press

to

Press

the

3-2:

Simulated

press

Key

to

INDICATOR

Rate

zero.

rate

the

PRIMARY

MENU

Key,

and

hold

verify

and

of

900

then

Use

Initial

the + and - portion

operation.

Key

and

Volume

and a Primary

RUN

Key.

the

repeat.

To

HOLD

Checkout

Press

Be

Delivered

Key.

of

the

PIG-

Return

volume

of

3.

Key

clicks

dible

tone

Rate

and
Delivered
decremented
attempt

0.0

ml.

Note:

4.

The

audible
proximately
LED

will

ume

To

HELP”.

5.

The

LCD

are

heard

will

sound

the

thousands

are

advanced

past

0.

is

made

to

set

Whichever
INDICATOR
TOR,

the

respective
brighter,
dimmer.

illuminate.

Be

Delivered

The

Then
Check

will

while

alarm

will

once

every

LCD

will

CLOSE

open

Placement

Secure

(picture)...

display:

as

the

as

the

column

past 9 or

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DELIVERY

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3.7.1

Table

Volume

10

3-3:

mi

Required:

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Close

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pump

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4.1

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OF

The

following
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few
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GENERAL

4.1.1

Patient

Manual

OPERATION,

describes

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used

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DESIGN

Safety

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the

basic

theory

to

specific

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are

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The

detailed

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chapter.

FEATURES

of

operation

format.

next

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DESCRIPTION

for

The

first

section,

Section

have

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the

Horizon

Section

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placed

Nxt

4.1,

is

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Appendix A lists

pump.

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the

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overall

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common

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the

description

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level

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sche-

abbreviations

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of
scribed

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rections

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arate

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to

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convenience

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proach
which

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cord

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parameters

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two

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ENTER

the

PANEL

equal

settings

levels.

Key

LOCK

to

gravity

allow

the

950500

free

Rate

within

OUT

with

maximum

Rev

flow

changes

six

Key

fluid

(06/00)

E

Horizon

Nxt®

Service

Manual

The

innovative

poles.

greater control

While

Pole

Clamp

supporting

of

this

the

process.

design

pump

with

provides

both

rapid

hands,

and

the

secure

pump

attachment

is

attached

to

to a variety

the

pole,

of

giving

standard

the

u

4.1.2

4.1.3

Ease

of

Operation

Ease

of

operation

pumps,

tion

Ease
sembly.
operations

and

Upgradability

The
design

tion,

Daisy

between

of

repair

Rapid

logs

service

of

Horizon

of

the

some

connections

the

Nxt

housing

sories.

The

most

likely

Erasable

can

which
plugged

Programmable

be

reached

protect

in

backwards.

and

Repair

is

enhanced

Chaining

pump

is

facilitated

access

of

power

and

the

through a modular

to

the

interior

provide a variety

the

Horizon

Modular

upgrade

by

simply

their

pins.

Nxt

Infusion

and

internal

are

built

choice

Read Only

sliding

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The

Biomed

sockets

by

characteristics

cords,

user.

of

pump.

into

adds

back

and a full

of

the

pump

time

and

date

System

assemblies

Memory

Menu

every

new

software

the

are

was

makes

Horizon

(EPROM)

top

polarized

can

or

features

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is

provided

stamped

designed

access

Nxt

to

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cover.

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so

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displays

to

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information

with

an

eye

for

service

for

the

addition

system.

integrated

EPROMs

that

identify

the

The
circuits

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the

the

Pole

that

provide

design,

case

that will

toward

are

the

or

upgrade

of

future

software

on

installed

cannot

installed

Clamp,

for

optimal

assembly

top.

assist

future.

simple.

options

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contained

the

main

in

special

be

software

stackability

of

interac-

and

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The

alarm

in

The

board,

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repair

modular

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addi-

and

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in

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up

or

versions.

4.2

FUNCTIONAL

The
signed

modular

agnosis

The

zel

and
Display
Door

Refer

DESCRIPTION

Horizon

major

Processor

to

Nxt

Modular

with

advanced

internal

and

repair.

subassemblies

Key

Panel,

Module.

safety

design

and

There

(DP);

allows

Main

are

Management

Chapter 5 for a detailed

Infusion

and

convenience

for

are:

Case

Board.

three

microprocessors

description

System

rapid

removal

Bottom,

Inside,

Processor

is a microprocessor-controlied

features

Power

the

(MP);

of

4-2

for

and

installation

Supply,

Door

Subassemblies

which

and

items

discussed

both

the

Main

contro!

the

most

Pump

in

operator

of

subassemblies

Battery,

Processor

this

volumetric

and

the

Half

are:

LED

all

functions.

section.

infusion

service

for

technician.

ease

-

Door/Bezel,

Display

They

Board

are

(PP).

950500

pump

of

problem

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and

as

follows:

E

Rev

de-

The

di-

Be-

LCD

(06/00)

Horizon

Nxt®

Service

Manual

4.2.1

4.2.2

4.2.3

Case

Bottom

The

case

bottom

to

the

case

software

ply

slide
The

The

shielding

Power

The

inlet
connects

watt

The

is

placed

Main

to

and

battery

into

place

case

top

case

bottom

for

Supply

Horizon

connector

to

design

supply

above

Battery

is

the

platform

bottom

cool

are

the
attach
on

ribs

slides

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Nxt

onto

and

entire

power

the

pump

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in

the

the

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supply

fan,

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case

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case

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the

main

using

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board

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power

and

technology

to

the

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case

on

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speaker,

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and

temperature

bottom

with one

bottom,

bottom,

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board

parts

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supplies

16

which

bottom

it

is

and

made

rest

of

the

pole

rises

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self-locking

and

the

main

locking

for

the

are

painted

in a sheet

daisy

and 5 volts

reduces

shielding,

secure

the

Horizon

clamp.

high

The

or

board

whole

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metal

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to

the

weight

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with

one

Nxt

is

assembled.

fan

is

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rates

>499

nut.

The

bezel

sits

on posts

assembly

multiple

system.

and

self-locking

together.

chassis

pumps.

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increases

of

tabs

Attached

on

by

management

ml/hr.

above

copper

with a filtered,

supply

The

and

door
everything

paint

The

power

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power

assembly

AC

efficiency.

and

slots.

Once

the

nut.

directly

sup-

else.

to

provide

power

supply

30

battery

4.2.4

4.2.4.1

The

Horizon

tery

connects

attaches

Half

Door/Bezel

The

Horizon

the

Air-In-Line

hinges.
groove

The

joints.

ducer.

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The

the

fluid

valve,

sure
seen

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quired

pump

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and

to

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power

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block.

door

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transfer

transducer

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for

pressurized

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operate

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charged

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is a plastic

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door

bezel

assembly

inside

(Figure

pump

surface,

Mechanism

Mechanism

The

various

valve,

2-5).

of

the

limits

fluid

by a circuit

is

held

in

part

to

and

bezel

is

positioned

it

captures

mechanically

important

the

restriction

the

In

pump.

the

movement

delivery.

12

volt

two

on

the

main

place

by

the

which

become

is

attached

one

in

the

cassette

controls

parts

valve,

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The

the

paragraphs,

of

the

door

must

amp-hour

board.

same

the

assembly

the

case

and

of

the

bezel

petal

module,

cassette,

be

sealed

The

battery

fastener

pump

when

bottom

tubing

the

flow-rate,

mechanism

mechanism

the

and

helps

closed

and

lead-acid

fits

nut.

mechanism

attached

via

gasketed

and

holds

volume,

are

the

refill

piston,

to

contain

securely

battery.

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into a holder

components

together

the

the

is

latched

by

the

tongue

and

pressure

and

pressure

bezel,

and

the

the

described

the

pressure

for

bat-

which

and

door

trans-

of

inlet

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is

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re-

the

4-3

950500

Rev

(06/00)

E

Horizon

Nxt

Service

Manual

4.2.4.2

4.2.4.3

pushed

4.2.4.4

Refill

The

of

has

al
tioned

Restriction/Outlet

The

restriction/outlet

zel.

The

valve

pose

of

the

pressure.

ing

valve

Petal

Module

The

function

module

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forward

into

the

delivery

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main

Piston

refill

cassette

to

the

petal

unusually

disk,

part

below

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under

valve

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restriction

position

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information

of

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just

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chamber

motor

piston

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refill

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inversely

module,

strong

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refill

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inlet

petal

the

Valve

valve,

(Figure

servo-control

to

provide

yoke

the

has

to

module

to

the

left

main

stepper

from

the

position

from

and

the

petal

module

(Figure

magnetic

2-5).

properties,

chamber

of

the

pump

2-5),

is

the

by

the

pump

proper

an

the

is

to

of

the

refill

the

downstream

optical

pump’s

sensor

system.

pressurize

restriction

motor

during

chamber

main

motor

mechanically

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delivering.

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face

of

the

which

of

the

cassette,

(@

negative

right-most

software

resistance

at

the

tip,

the

delivery

valve and

fluid

delivery

during

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optical

linked

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piston

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the

refill

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the

valve

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the

restriction

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called

chamber

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of

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retracts

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encoder.

main

motor

piston

piston

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the

of

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yoke

the

cassette.

rubber

as

fluid

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drive.

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large

construction.

attached

the

The

pur-

operating

sensor,

cover.

pump

The

petal

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met-

supply

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be-

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It

4.2.4.5

Transfer

The
livery
controls
These
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chamber

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flow

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are

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controls

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fluid

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located

between

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the

mechanically

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solenoid.

transfer

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the

refill

chamber

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fluid

from

petal

to

provide

the

module

and

is

located

inverse

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chamber

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the

to

operation

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piston.

the

left

and

the

cassette

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of

the

are

to

the

inlet

valve

refill

piston.

operated

by

de-

the

4-4

950500

Rev E (06/00)

Horizon

Nxt®

Service

Manual

4.2.4.6

PRESSURE

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4/0

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6

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AMP

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DIRECTION

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10

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ENABLE

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|

ENCODER

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Description

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asie-

ASIC-
ASIC-

950500

Rev E (06/00)

Horizon

Nxt®

Service

Manual

4.2.4.6

Mechanism

The

Horizon

ning

of a pumping

is

open,

attached
attached

The

a

screw

until the
refill
ot

point

each

main

tion
tain

As

allow

optically
(17)

controls.

the

to
to

petal

module

thread.

selected

piston

(7).

cycle

stepper

valve

opens

constant

the

petal

entry

monitored

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cycle,

the

petal

9),

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3)

is

module

refill

empty.

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piston

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attached

the

RUN

delivery

moves

to

module

of

output

in

the

opposite

The

main

stepper

deliver a precise

motor

pressure

step

and

an

closes

in

the

moves

fluid

from

the

to

give

goes

to

Sequence

volumetric

restriction

is

back

and

(3)

is

forward

to

the

Key

is

pressure

(6)

direction,

motor

amount

equal

amount

as

the

pump

delivery

forward

container

positive

an

under

indication

amplifier

displacement

(10)

and

the

cassette

and

bezel

and

pressed,

is

achieved,

because

drives

the

of

fluid.

of fluid

software

chamber.

stepper

while

the

(6).

The

transfer

delivery

the

cassette

is

driven

the

petal

and

delivery

it

is

petal

module

The

delivery

is

delivered.

reacts

to

motor

inlet

valve

of

motion.

amplifier

method

(5)

valves

by

module

to

deliver

are

chamber

refill

chamber

the

main

assembly

closed,

begins.

mechanically

forward a certain

is

approximately

As

delivery

varying

control,

Pressure

output

is

open.

fluid

the

refill

is

has

The

separate

monitored

fluid.

the

inlet

is

full

(cassette

(cassette

stepper

At

connected

motor

is

driven

the

same

through a piv-
number
linear;

proceeds,

line

conditions

piston

encoder

moves

by a load

offset

At

the

(2)

portion

shaft

forward

time,

of

for

the

to

wheel

and

begi.

valve

portion

via

the

steps

each

restric-

main-

back

to

(8)

is

cell

gain

the

transfer

pivot

4.2.4.7

4.2.4.8

Mechanism

Air-In-Line

When
close

the

through a pivot

point

just

valve

point

from

the

refill
changes
delivery

The

and
are
tical

The
to

the

er

in

state
cycle

mechanism

door

assemblies.

provided

yoke,

air-in-line

patient.

the

door.

alarm.

delivery

cycle

point

before

to

(4),

open

and

the

the

chamber

and a spring

is

repeated.

Interface

interface

One

for

the

main

transfer

Block

block

The

set

solenoid,

is

When a bubble

is

complete,

(11).

valve

and

the

petal

module

to

the

forces

Board

board

large

stepper

an

optical

tubing

is

the

restriction

The

tip

of

the

starts

to

open.

inlet

valve

to

close

retracts

delivery

the

transfer

is

the

connection

connector

motor,

air-in-line

bubble

pressed

as

chamber.

mates

main

block,

detector

tightly

above a certain

motor

restriction

The

transfer

because

the

When

valve

point

with

motor

and

which

into

the

size

is

motor

refill

piston

the

to

shut

between

the

main

encoder,

door

assembly.

the

slot

detected,

causes

the

is

optically

solenoid

it

is

mechanically

moves

transfer

and

the

the

board

restriction

system

in

the

block

the

pump

restriction/outlet

monitored

(1)

energizes,

connected

forward

is

complete,

inlet

valve

main

and

from

uses

to

to

to

board

there,

motor,

prevent

valve

to

causing

through

transfer

the

solenoid

open

and

and

the

connectors

restriction

pumping

by a spring-loaded

will

stop

pumping

to

dete:

the

fluid

the

bezel

op-

air

push-

and

4-6

950500

Rev E (06/00)

©

Horizon

Nxt®

Service

Manual

4.2.4.9

LED

The

and
the

inputs,
ducer

4.2.4.10

The
actual

128 x 64
This
increase

three

4.2.4.11

The
sures
signal

Display

LED

the

door

management

controls

board

LCD

Display

LCD

glass

screen

module

the

minutes

Pressure

transducer

fluid

before

Board

display

board

processor

processor

the

memories.

Module

display

module

display

elements,

requires

backlight

ifno

keys

Transducer

is

essential

pressure

it

is

sent

is

the

integrated

LCD

display’s

largest

on

circuit.

the

main

visual

PCB

is a factory-assembled

screen, a printed

and

an

electroluminescent

the

LCD

controller

life

span

and

reduce

have

been

pressed

to

the

operation

in

the

delivery

to

the

pump

chamber

processor

inside

The

board,

contrast

circuit

board

components

power

on

of

of

the

door.

door

processor

controls

and

backlight,

liquid

containing

backlit

on

consumption,

the

face

the

pumping

the

cassette.

on

the

main

It

contains

software

the

LED

crystal

driver

panel

the

LED

of

the

pump.

mechanism

The

circuitry

board.

the

receives

displays,

controls

display

module

electronics

to

allow

board

the

display

red

LED

display

commands

processes

the

display

containing
that

viewing

to

operate.

is

(Figure

amplifies

in

dimmed

2-5).

this

digits

from

key

panel

and

trans-

the

control

In

low

light.

order

the

after

It

mea-

pressure

to

4.2.5

Main

The

processor,

grams

which

board,

A

switch

the

front

ceiver

work

assembled

The

batteries,
beeper

Read

ware programs.

The

face

of

the

the

window

transducer

face

cassette.

Board

main

board

pump

which

are

main

control

part

of

battery,

located

of

the

pump

pair.

These

in

concert

main

and

and

Only

with a Serial

pump

board

performs

an

battery

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pressure

in

the

delivery

is

covered

is

the

center

processor,

the

operation

the

case

bottom,

power

at

the

rear

while

devices

to

allow

send

communications

all

interface

on

for

board.

integrated

transducer

chamber

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of

the

Horizon

and

their

associated

of

the

and

has

supply,

of

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Data

pump

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fan,

the

board

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running.

and

receive

Communications

mechanism

an

option

has

special

circuits

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made

of a rubber

of

the

cassette

Teflon

Nxt

EPROMs.

rest

of

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connections

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speaker.

is

used

to

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at

to a sensor

tape

electronics

system.

enable

the

rear

through a plastic

Infrared

with

the

Horizon

control

board.

which

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controls

sockets

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for

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compound

in

to

protect

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main

to

the

mechanism

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lock

out

of

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board

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software.

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the

two

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audio

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management

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transmits

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body

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it

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user

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in

the

that

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friction

the

the

mounts

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optical

of

on

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alarm,

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and

pump

pressure

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with

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the

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board,

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key

pro-

four

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panel

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on

transmitter/re-

the

case

top,

and

to

the

rear

of

the

circuits

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processor

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the

alarm

soft-

The

and

main

board

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access

in

place

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by

ribs

in

the

the

bezel/mechanism

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case

top

and

when

power

it

is

slid

on.

This

supply/battery.

eliminates

950500

Rev E (06/00)

fasteners,

Horizon

Nxt®

Service

Manual

5.0

5.1

THEORY

POWER

WARNING:

The

Horizon

voltage

either
enters
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，

The
so

it

LCD

can

display

be

viewed

module

in

dim

contains

an

lighting

electroluminescent

conditions.

5-4

This

backlight

panel

which

requires a power

is

used

to

backlight

supply

950500

the

display

of

100

volts

Rev E (06/00)

Horizon

Nxt®

Service

AC

at

of

the

VMAIN

Manual

400

Hz

display

supply

has a limited

backlight

when

frequency.

board.

operating

The

to

the

inverter,

no user

life,

interface

This

voltage

door

processor,

which

over

is

generated

turns

which

activity

it

by a DC

commanded

the

backlight

grows

is

dimmer,

taking

place.

by

to

AC

the

management

on

and

off.

so

the

management

converter

mounted

processor,

An

electroluminescent

software

on

the

back

controls

the

panel

turns

off

the

5.2.6

5.3

PRESSURE

LCD

Module

The Liquid

troluminescent

el.

It is a “transflective”

transmissive

The

LCD

high

array.

signals.

The

generated

door

processor.

ature

sensitive.

Assy.

Crystal

backlight.

backlight

panel contains

Control

actual

on

the

display

signals

voltage

This

This

ments.

The

backlight

volt

AC

signal

brightly

After

the

is

tumed

is a solid-state

generated

as

time goes

pump
off,

starts

pushing

light.

TRANSDUCER

Display

It

type

for

viewing

1024

for

(Vicd)

board

voltage

allows

on,

on

so

the

the

running,

any

key

module
is

of

the

also

is a combined

supplied

display,

square

and

by

in

dim

elements

display

that

turns

adjusted

varies

display

to

Epson

with a built-in

or

no

light.

(pixels)

are

generated

on

the

(under

with

temperature,

work

over a temperature

electroluminescent

display

the

backlight

the

panel

board.

is

turned

backlight

key

is

will

The

turned

turn

LCD

U.S.A.

reflector

by

LCD

pixels

operator

(EL)

sheet

glowing

on

and

off

to

it

back

screen,

and

driver

is

not

for

arranged

the

LCD

is a negative

control

since

the

which

phosphors

off

under

extend

on

so

its

that

electronics

repairable

viewing

as a 128

controller,

in

pixel

voltage

through

the

behavior

range

without

glows

when

in

this

panel

management

useful

the

life.

display

board,

to

the

component

brighter

wide

and

are

(-7

User

Menu)

of

the

LCD

requiring

energized

tend

software

Once

can

be

and

light,

by

64 pixel

all

logic

to

-8.5

is

temper-

adjust-

by a 100

to

glow

control.

the

backligh

seen

in

elec-

lev-

and

a

level

volts)

by

the

less

dim

5.3.1

5.3.2

Pressure

The
voltage.

amp
tains
ducer
which

Offset,

The

op

amp

plifier

and

ratio of
bution

Therefore,

reference

Fransducer

pressure

The

U2A,

2.5

volts

supply

has

Gain,

sensed

U2B.

U2B

the

-2.5

feedback

from

is

transducer

pressure

2.5

volt

reference

across

return

unity

terminal.

gain.

and

Output

pressure

Amplifier

sums

the

volt

reference

resistor

the 2.5

R$

scaled

is

selected

by

volt

Circuits

converts

transducer

CR1,

resistor

R3,

The

Circuits

transducer

U2B

inputs

from

CR2.

R2

output

is

constructed

to

input

reference

to

correct

of

ratio

the

the

pressure

is

powered

applied

by a constant

and a 1.65K

which

results

differential

signal

the

pressure

The

contribution

is

as a summing

transducer

resistor

is

scaled

for

feedback

by

negative

resistor

5-5

to

its

ohm

current

in a constant

pressure

amplified

transducer

and

sense

from

the

R5,

the

offset

which
ratio

provides a signal

of

feedback

errors.

input

to

R2

surface

current

setting

membrane

source,

resistor,

1.5

milliamps

output

adjusted

amplifier,

with a signal

amplifier,

sensed

pressure

resistor

The

contribution

resistor

to a differential

which

R3.

out

is

sensed

for

offset

the

2.5

signal

gain

R2

Therefore,

R7.

is

generated

Op

amp

of

the

pressure

by

errors,

gain

volt

reference

is

of

47.5.

to

input

from

950500

output

by

U2A

main-
trans-

op

amp

U3A,

by

means

of

47.5.

CR1,

scaled

The

by

contri-

resistor

the

-2.5

volt

selected.

is

R7

Rev E (06/00)

op

of

Am-

the

R8.

‘

|

Horizon

5.4

Nxt®

Service

to

correct

Op

amp

output

MECHANISM

The

mechanism

semblies.

the

main

air-in-line

ponents
bon

One

stepper

cannot

cable

block,

to

Manual

for

positive

U3B

inverts

with

maximum

INTERFACE

interface

100-pin

motor,

and

door

be

plugged

withstand

offset

the

offset

range.

BOARD

board

is

connector

main

assembly. The

in

the

large

mates

motor

incorrectly.

number

errors.

adjusted pressure

ASSY.

the

connection

with

the

main

encoder,

restriction

connectors

The

door

of

door

operations

point

board

are

cable

signal,

to

between

and

motor,

polarized

restriction

assembly

over

complete

the

main

from

there,

and

sized

is

built

the

life

the

formation

board

and

connectors

optical

so

that

with

of

the

pump.

the

bezel

are

yoke,

transfer

the

mechanism

special

high

of a differential

and

door

as-

provided

for

solenoid,

com-

flex-life

rib-

5-6

950500

Rev E (06/00)

Horizon Nxt®

Service

Manual

Figure

5-1:

Main

Board

Layout

Description

Option

Pump

Pump
Management

ABN-

Management
Pump

AN

Management
ASIC

OSN

EPLD

μα

o

.

4.8

Board

Processor

Processor

Processor,

Volt

NiCad

Connector

memory

EPROM
Processor
Processor

80C537

Processor,

Memory

EPROM

Battery

V25PLUS

5-7

14

11.

3.0

Volt

12.

Main

13.

Touch

14.

Bezel/Door

15.

Motor

16.

Backup

17.

Main

18.

Fuse

19.

Fan/Speaker

20.

Power

Lithium

Battery

Switch

Connector

Drivers

Alarm

Battery

2,

Main

Supply

Battery

Charger

for

manual

Connector

Battery

Switching

Connector

Connector

turn

off

950500

Rev E (06/00)

Horizon

„

55

Nxt®

Service

MAIN

The

main
cessors,
delivery

marily

application
fluid

delivery,

management

Manual

BOARD

board

the

ASSY.

utilizes a dual

management

operations,

responsible

specific

as

directed

processor,

for

integrated

processors. A block

systems

nents.

5.5.1

is

See

shown

Figure

in

Figure

5-1.

Management

The

management

the

8086

microcomputer.

Plus

can

directly

by

Memory
controlled
multifunction
The

microprocessor

internal

Request

by

ИО

I/O

oscillator.

processor,

and

generating

controlling

circuit

by

the

and

provides

diagram

of

4-1. A picture

Processor

processor,

address

©MREQ),

Strobe

ports,

(IOSTB)
including

operates

processor

architecture,

is

primarily

display

fluid

delivery

(ASIC)

pump

the

It

1M

processor.

the

interface

main

board’s

U11,

is a V25

uses a 16

byte

of

Memory

and

one 8 bit

at a clock

for

responsible

information.

operations,

generates

The

the

ASIC

between

major

of

the

main

board

Plus

microcomputer,

bit

internal

memory

Strobe

data

and

(MSTB),

Read/Write

analog

frequency

both efficiency and

for

interpreting

The

other

processor,

as

directed

waveforms

also

the

external

circuits

1M

and

is

included

bus

byte

and

(R/W).

The

comparator

of

12

MHz,

by

that

provides

photo-interrupter

their

to

which

and

an 8 bit

of

/O.

Memory

Read/Write

V25

has

port

which

reliability.

operator

the

management

control

all

connections

help

is

external

inputs,

the

pump

the

two

address

decoding

to

identify

software

data

accesses

(R/W).

two

serial

for

discrete

is

supplied

or

by a crystal

One

of

the

initiating

processor,

processor.

motors

for

LEDs

the

selected

compatible

I/O

channels

analog

and both

external

compo-

bus.

The

are

controlled

accesses

and

inputs.

and

pro-

fluid

is

pri-

An

during

the

sub-

with
V25

are

four

an

x

The

retained

a

up
tegrated
system.
retrieved

§.5.2

Door

The

chronous
the
to
The
(management
management
ready
DOOR

§.5.3

LCD

The
from,
a74HC245

management

in

an

74AC11032

with 2 3

circuit,

Pullup

by

Interface

management

serial

data

line,

processor

extemal

NAND

volt

on-board

U5.

and

the

microcomputer

Bus

processor

bus.

and

it

uses

transmit a message

management

processor

processor

processor

to

receive.

line

Interface

management

the

external

The

(port

pin

processor

LCD

octal

bidirectional

program

128K

byte

gate,

U7A,

battery,

Therefore,

pulldown

The

resistors

communicates

management

port pin

by

raising a flag

then

port pin

sends

messages

management

22).

can

controller,

buffer,

is

stored

RAM,

to

BT2,

data

if

U10.

provide

which

will

be

on

the

non-existent

processor

P17

to

drive

on

the

grants

P21).

permission

The

to

the

processor

write

commands

via

an 8 bit

U9.

The

in

an

The

RAM

the

necessary

is

switched

retained

data

bus

memory

with

the

uses

the

clock

DOORRTS

to

DOORRTS

door

processor,

can

reset

and
parallel
management

external

512 K byte

write

address

in or

in

RAM

ensure

is

addressed.

external

line.

send

display

port

pin

The

line

by

and

the

external

data

path.

door

(management

DOORCTS

data

processor

EPROM,

line

is

gated

setup

time.

out

by a 691

even

if

the

board

that

an

Interrupt 3 instruction

processor

P14

to

transmit

door

processor

processor

raising a flag

lines

since

the

door

door

processor

to,

and

read

The 8 bit

Memory

U13,

and

data

by

Memory

The

power

is

removed

Strobe

RAM

is

backed

with

supervisory

from

will

via a bidirectional,

and

receive

requests

on

the

DOORCTS

are

not

used

processor

with

status

and

data

path

Strobe

data

permission

port

pin

P07).

when

is

normally

the

RESET-

display

is

buffered

is

gated

data

with

is

in-

the

be

syn-

on

line

the

by

5-8

950500

Rev E (06/00)

Horizon

Nxt®

Service

5.5.4

Manual

the

Read/Write

an

LCD

write

processor

a

74AC11032

allows

read

IR

Link

The

of a full

path
ment
port
infrared
is

transparent

red

transmit
from
detected

to

the

of

9600,

be

downloaded

memory

the

LCD

management

duplex,

allows a fluid

processor

output

light

the

host
by a phototransistor,

management

no

line

by

line.

An

address

NAND

gate,

management

status.

processor

asynchronous,

tight,

is

dedicated

pin

is

re-driven

at

940

nM.

to

infrared

data

to

RS

is

similarly

processor

parity, 8 data

in

approximately

two

74AC11032

LCD

select

space,

U7D,

processor

can

line

from

provides 2 LCD

to

transmit

infrared

electrically

for

this

by

PNP

transistor

The

LED

is

light.

232

converted

An

levels,

D3, located
serial

bits

and 1 stop

optional

and

to

port

90

NAND

is

generated

400

hex

write

LCD

fo

and

(IR)

communications

isolated

purpose.

interface.

Transmit

O37,

positioned

external

completes

infrared

seconds.

at

the
input
bit.

With

light

pin.

Refer

gates,

to

commands,

receive

U7B

by

the

401

hex. A single

read

addresses

data

and

then

at

the

rear

IR

communications

the

transmission

by

the

rear

of

the

The

data

this

format

to

the

and

ASIC.

write

serial

data

link.

One

of

from

routed

of

the

external

main

is

an

PC

UTC,

It

is

address

and 2 LCD

LCD

from

The

the

two

the

management

to

an

main

to

an

IR

communications

board.

sent

as

entire

Docking

to

produce

decoded

data,

an

external

infrared

serial

LED,

board,

module

external

This

data

ASCII

log,

alarm

Manual,

an

LCD

read

from

managemen.

line,

AO,

buffered

write

addresses.

read

LCD

data,

host

by

means

communication

ports

in

the

manage-

processor

D2,

which

produces

facing a window

converts

host.

is

text

using a baud

or

Part

the

RS

232

module,

routed

operation,

No.

directly

950441.

anr

by

This

and

serial

that

infra-

data

and

rate

can

5.5.5

Pump

The

pump

architecture.
and

64K

the

lower

dress

bits

(ALE)
trolled
memory

The

pump

an

external

on

the

data

memory

In

addition
channels,
plied by a crystal

5.5.6

Interprocessor

The

management

cated

full

the

pump

sages

to

Processor

processor

With

bytes

of

eight

address

must

be

before

by

the

Program

writes

are

processor

128K

bus

ensure

is

addressed.

to

its

and

12

duplex

processor

the

management

is

an

80C537

16

address

data

memory.

bits

stored

eight

data
Store
controlled

program

byte

RAM,

that a NOP

address

A/D

inputs.

and

an

Communications

processor

asynchronous

at

any

bits,

are

multiplexed

in

the

74HC373

bits

Enable

by

is

UL,

and

data

The

internal

and

serial

time

over

processor

microcontroller,

the

80C537

Eight

output

pins

with

latch,

are

presented

(PSEN),

Write

stored

(WR).

in

although

instruction

ports,

the

80C537

on

data

memory

an

external

only

will

80C537

operates

oscillator.

Bus

the

pump

at

processor

ports.

the

The

V25TO537

any time over

U3,

which

can

directly

are

dedicated

the 8 bit

U16,

with

the

same

reads

64K

half

the

RAM

be

retrieved

'

has

five 8 bit

at a

communicate

management

line,

the

is

based

address

to

data

bus.

the

falling

lines.

byte

Program

are

controlled

EPROM,

can

by

the

multifunction

clock

frequency

processor

and

the

pump

537TOV25

on a superset

64K

bytes

of

the

upper

Therefore,

edge

eight

the

of

Address

memory

by

Read

U6,

and

be

accessed.

microcontroller

Pulldown

I/O

of

12

MHz,

with one

another

can

transmit

processor

line.

of

the

program

address

lower

Latch

fetches

(RD),

data

is

retained

if

nonexistent

ports,

two

which

through

messages

can

transmit

80C31

memory

bits,

but

eight

ad-

Enable

are

con-

and

data

in

resistors

serial

is

sup-

dedi-

to

mes-

5-9

950500

Rev E (06/00)

Horizon

Nxt®

Service

§.5.7

Manual

ASIC

The

ASIC,

performs

pump

processor,

main

motor

U19,

all

address

and

interfaces

with

decoding

generates

restriction

stimuli

motor.

both

for the

for

the

management

management

external

sensors,

processor

processor,

and

performs

generates

bus

and

the

I/O

motor

pump

address

drive

processor

decoding

waveforms

bus.

for

the

for

the

It

5.5.74

5.5.7.2

Address

The

Clamp

the

Motor

The

modulated

four
no

more

control.

sient
eight

nal

Decoding

AIL

LED,

LED,

pump

Controller

ASIC

phase,

than a single

The

suppression

PWM

from

the

TALARM.

The

ASIC

which

in

turn

command

period
noise

of

when a motor

and Stimuli

test

AIL

and

the

processor.

receives

(PWM)

motor

waveforms

unipolar

eight

PWM

diodes.

motor

controls

the

time,

waveforms

EPLD.

the

determines

ASIC

at

to

the

LED,

door

switch

commands

stepper

step

motors. A single

from a single

motor

The

See

Section

duty cycle

the

ramp

the

beginning

step

is

applied.

main

motor

can

all

from

for

the

waveforms

resulting

in

the

ASIC

5.5.12.2

of

the

average

duty

or

end

current

cycle

encoder

be

energized

the

pump

main

motor

command

motor,

are

drive

signals

can

be

“Power

PWM

of a motor

waveforms,

through

of

the

LED,

restriction

by either

processor

and

the

from

so

the

motors

re-driven

are

by

then

completely

Controller

the

motors.

PWM

waveform

step.

This

valve

the

management

bus,

and

restriction

the

are

eight

routed

inhibited

EPLD”

as

directed

is

motor.

pump

always

N-channel

to

the

by

for a description

The

pump

up

or

done

to

LED,

Anti-Freeflow

generates

Both

processor

under

by

down

reduce

strict

FET’s

motor

the

windings.

LATALARM

the

pump

processor

over a selectable

the

processor

pulse

motors

can

or

width

are

result

processor

with

tran-

The

sig-

of

LA-

processor,

can

also

acoustical

in

cd

5.5.7.3

ASIC

The

stepping

mand

tor

out,

the

microseconds

processor

matically

5.5.8

|

Transfer

The

pump

built-in

of

the

PWM

Timers

ASIC

also

contains

rates

selected

is

automatically

timer

issues

three

timer

times

interrupts

timer

clock

out.

or

only

when

2.73

executed

Valve

timer/comparator

waveform
motor

Solenoid

processor

after

waveform

generates

initial

two

programmable

by

the

pump

executed

to

the

periods

The

main

before

motor

milliseconds.

its

timer

times

at

that

time.

Driver

the

PWM

circuit,

is

inverted

using

pull-in

of

by a P-channel

processor

when

the

pump

processor

the

timer

The

out.

The

restriction

waveform

port

the

solenoid,

5-10

timers,

main

timer

clock

one

are

accurate.

motor

at

three

times

period

restriction

Any

pending

motor

for the

pin

P4.7.

in

FED,

The

order

Q3,

for

each

Any

timer

times

different

out,

and

seven

can

be

motor

timer

restriction

timer

clock

transfer

pump

processor

to

minimize

and

driven

motor,

pending

to

out.

In

points:

timer

ensure

main

addition,

when

clock

programmed

issues

valve

interrupts

motor

period

solenoid

reduces

step

is

power

by

an

N-channel

©

that

the

motor

motor

to

command

685

by

step

com-

the

main

the

timer

times

periods

be

to

before

either

the

341

pump

is

auto-

microseconds.

means

the

duty

of

cycle

consumption.

FED,

Q32,

950500

Rev E (06/00)

mo-

a

The

Horizon

Nxt®

Service

Manual

with a transient

winding.

5.5.9

Temperature

The
D

port

fan,

suppression

5.5.10

External

5.5.10.1

§.5.10.2

The

pump

processor

pin

P7.0.

through

diode,

Sensor

Panel

The
on
case.

The

sion

Door

Lock

panel

the

main

The

software

of

the

Switch

suppression

other

side

Controller

monitors

Ifthe

port

pin

CR24,

Interface

Out

lock

out

board.

state of

toggles

switch.

diode,

of

the

solenoid

the

temperature

P6.4.

and a 7.5

Switch

switch

It is

the

switch

between

The

fan

is a single

accessible

signal

CR30.

air

The

resulting

is

connected

temperature

inside

exceeds a preset

signal

volt

the

is

re-driven

zener

diode,

pole,

double

to

the

user

is

monitored

lock

out

mode

drive

signal

to

VMAIN.

the

case

threshold,

by

CR18,

throw,

the

an

N-channel FED,

before

momentary

through a flexible

by

the

management

and

the

non-lock

is

with a thermistor,

pump

being

membrane

then

routed

TH1,

processor

turns

Q13,

routed

switch,

processor,

out

mode

to

which

in

the

via

with

to

the

solenoj“

through

A/

on a cooling

with a transient

the

fan

motor.

is

mounted

rear

of

the

port

pin

POS.

each

depres-

The

in

The

is

ASIC.

stuck

5.5.10.3

The
ed
extreme

ternate

proximately
output,
routed

The

striction
the

linkage.

transition
ceived

door

the

bezel.

state

directly

Therefore,

low

Encoder

position

to

the

spokes

ENCODERSEN,

to

position

position

by

switch

of

and a real

motor

limit.

both

valve

At

in

inverting

is a single

The

switch

the

switch

energized

is

by

the

management

closed

and Restriction

of

the

main

shaft.

The

and holes

four

pulses

main

The

motor

processors.

of

the

restriction

is

first

initialized

where

this

point,

logic

levels:

the

restriction

the

schmitt

pole,

double

is

closed

by

monitored

the

STIM

door

condition,

Valve

motor

in

is

determined

motor

are

generated

the

encoder

is

steps

is

received

valve

to a reference

motor

output

high

from a photo-interrupter

for

trigger

throw,

means

by

signal,

processor

of a magnet

the

management

which

by

first

initialized
by a photo-interrupter

wheel.

and

low

by

inverting

is

determined

shaft

contact,

U2

on

low

the

magnetically

in

processor,

can

be

generated

can

distinguish

toggling

by

counting

the

to a known

The

encoder

for

approximately

schmitt

position

makes

for

main

trigger

by

counting

(fully

initial

no

contact.

board,

operated

the

door

between a switch

STIM

pulses

switch,

whenever

via

port pin

by either

signal.

from

an

position

assembly,

output

contact

assembly

and

signal

six

main

U2

on

restriction

closed

position)

with

in

This

output,

then

routed

which

the

processor

encoder

by

retracting

which

remains

motor

the

main

motor

the

spring

the

valve

RESTRSEN,

to

both

is

mounted

door

is

P01.

The

via

signal

that

wheel

it

detects

high

steps.

board,

by

This

and

steps.

moving

loaded

link

makes

processors.

closed

switch

the

is

mount-

to

its

the

al-

for

ap-

then

The

re-

it

to

valve

a

is

re-

The

STIM

LEDs

signal

in

both

photo-interrupter

generated

in

the

ASIC.

5-11

assemblies

The

STIM

are

connected

signal

is

in

series,

re-driven

by

and

energized

transistor

Q32

950500

by

the

and

current...

Rev E (06/00)

y

Horizon

Nxt®

Service

Manual

5.5.10.4

5.5.11.

The

_

onboard

limited

Air-In-Line

Air
ed
LED
uids
the

board.

with a 220

bubbles

circuit

resistors.

to

detect

ASIC.

The

processors.

Another
and

photosensor.
photosensor.
is

energized

before

red

U4B

Power

main

being

light

and

board

power

ohm

resistor

Block

in

the line

board

One

air

The

AILLED

output

In

normal

are

contains

bubbles

two

pair,

the
in
signal

of

this

pair,

operation,

detected

LED/photosensor

The

TESTAIL

The

AIL

output

by

the

TESTAILLED

routed

emitted

then

circuits

converter,

to

by

the

routed

are

the

AIL

AIL

to

both

powered

the

main

before

by

means

separate

AIL

pair,

the

line.

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is

re-driven

AILSEN,

AILSEN

pair,

the

TESTAIL

LED

signal

is

signal

board.

LED.

Its

processors.

by

the

battery,

being

routed

of

the

infrared

utilizes

LED

LED/photosensor
the

is

by

is

received

is

high

pair,

is

positioned

high

when

generated

The

TESTAIL

output

signal,

AILTESTSEN

external

and

two

to

the

LED’s.

air-in-line

different

energized

transistor

by

for

is

to

the

TESTAIL

in

by

Q31

comparator

air

and

used

to

emit

the

ASIC

photosensor

AILTESTSEN,

is

power

supply,

onboard

batteries.

block.

The

pairs,

indices

the

of

AILLED

before

U4A

low

for

test

the

operation

infrared

light

LED

is

and

re-driven

is

is

high

when

an

onboard

air-in-line

with

current

refraction

signal

being

routed

and

then

routed

liquids.

of

directly

on.

The

TESTAIL

by

transistor

positioned

received

the

voltage

AIL

to

by

LED

block

print-

limiting

of

air

and

liq-

generated

to

the

AIL

to

both

the

AIL

LED

onto

the

AIL

LED

Q30

detect

comparator

regulator,

is

on.

infra-

in

an

5.5.11.1

When

VSUPPLY

Therefore,

The

connected

CR31.
value
when

5.5.112

All
through a séries

op

called

5.5.113

The
The
amp
The

VSUPPLY

the

main

Since

of

the

it

is

VMAIN

ofthe

amp

output

VMAIN.

VBATT

external
node

U22A,

output

Horizon

line.

The

when

the

board

provides

to

VSUPPLY

the

power

higher

turned

on

VSUPPLY

.05

through

12

volt

on

the

load

through

of

the

op

Nxt

is

plugged

power

Horizon

that

under

supply

of

the

two

but

not

current

ohm

resistor,

A/D

lead-acid

side

of

two

sense

amp

is

into

an

supply

Nxt

DC

then

is

not

source

software

also

sources

sources:

plugged

that

is

in,

used

R44,

input

P7.3.

battery

the

wires

is

fuse

is

provided

monitored

AC

outlet,

uses

VSUPPLY

plugged

by

control,

16

and

by

and

The

connected

called

by

in,

means

through 2 amp

16

volts

volts

when

zero

when

or

distributed

op

amp

node

to

VBATT.

for

that

the

pump

the

power

the

power

of an

supply

to

generate 5 volts

supply

external

main

fuse

through a diode,

the

Horizon

it

is

not

by

U17A.

on

the

the

main

The

load

The

purpose:

processor,

Nxt

turned

the

main

pump

side

board

battery

BATTSEN+

through

generates

can

generate

battery,

FU2,

FET

VSUPPLY

is

plugged

on

and

board

processor

of

the

.05

through

voltage

A/D

16

on

the

which

Q35,

will

in,

not

plugged

is

measured

monitors

ohm

a 2

amp

is

measured

and

BATTSEN-

input

volts

on

the

VCC

line.

the 5 volts.

can

be

and

diode

reflect

12

the

volts

in.

the

resistor

fuse,

is

FU2.

by

op

.

P7.2.

5-12

950500

Rev E (06/00)

Horizon

Nxt®

Service

In

itor

a
to
P3.2.

whenever

EPLD,

The

integrated
between
bulk-charge
The

Manual

addition

the

condition

2.5

volt

the

management

The

U8.

main

pump

to

the

analog

of

the

reference,

DEADBATT

VBATT

board

circuit,

three

state, a controlled

processor

VR2,

processor

is

less

maintains

U20,

different

can

measurement

battery.

whenever

signal

than

the

which
charge

disable

The

non-maskable

is

generated

10.3

charge

is

powered

states,

overcharge

the

of

VBATT,

LOWBATT

VBATT

by

volts.

DEADBATT

on

the

main

by

depending

state,

charger

two

comparator

signal

is

less

interrupt

comparator

battery

VSUPPLY.

on

and a precision

during

is

than

input,

is

by

the

condition

battery

circuits

generated

10.5

volts.

P10,

and

U26C

connected

means

The

and

of a UC3906

UC3906

of

float-charge,

operation.

are

provided

by

comparator

LOWBATT

to

pump

voltage

to

automatically

the

battery: a high

the

power

or

processor

reference

to

U26A

is

connected

VR2

controller

battery

standby,

charger

switches

current

mor

an.

input

state.

5.5.11.4

55.11.55

V+

V+
regulator,

V-

-8

itor

which

during

5.5.11.6

VMEM

A 3 volt,

backup
the
nects

fore,

-

«when

5.5.11.7

VBKUP

is

produced

VRİ.

volts

is

produced

voltage

converter

outputs

-8

power-up.

280

ma-hr,

power

source

time-of-day

either

information

the

main

the 3 volt

from

12

volts

from

12

with

volts

on

the

nonrechargeable

for

VMEM.

integrated

VCC

stored

board

in

is

removed

or

16

volts

volts

or 16

regulator,

V-

U24.

line.

Q33

lithium

VMEM

circuit,

U18. A 691

or the 3 volt

the

RAM

and

from

the

on

VMAIN

volts

on

The

is

provided

battery,

powers

power

battery

voltage

the

time-of-day

Horizon

by

VMAIN

-8

volt

to

BT2,

the

management

supervisory

Nxt.

an

onboard

by an

regulator

ensure

to

VMEM,

integrated

onboard

that

is

provided

78L08

1054

output

V-

cannot

on

is

gated

the

processor
integrated
whichever

circuit

is

eight

volt

voltage

switched

by

FET

become

main

RAM,

circuit,

is

higher.

maintained,

positive

board,

U10,
U5,

capac-

Q33,

as

a

and

con-

There-

even

A

4.8

volt

battery

UP.

The

battery

batteries.

cuits,

alarm
The
from

VBKUP

It

obtains

only

R23,

VBKUP

the

2.5

will

be

4.8

volt

VSUPPLY.

normally

power

if

the

Horizon

diode

CR17,

pack,

pack

powers

volt

reference,

operable,

battery

pack

obtains

from

Nxt

and

BT1,

is

consists

the

and

even

if

is

charged

power

the

4.8

volt

has

been

FET

Q36

provided

of

four

rechargeable,

backup

the

alarm,

the

main

Horizon

by

diode

from

VCC,

battery

turned

if

the

5-13

on.

Horizon

on

the

the

battery

Nxt

CR3

through

pack

It

also

main

board,

1.2

power

threshold

is

not

and

diode

or

VSUPPLY

obtains

Nxt

has

as a backup

volt,

100-110

controller

detectors.

plugged

resistor

in
R2

CR5,

through

power

been

turned

power

ma-hr,

EPLD,

Therefore,

and

the

whenever

-

whenever

diode

from

VBATT

on.

“

source

nickel-cadmium

the

power

the

main

battery

power

VCC

CR6

is

is

and

through

950500

RevE

for

VBK-

switch

cir-

backup

is

dead.

available

available.

FET

Q36

resistor

(06/00)

.

Horizon

Nxt®

Service

Manual

§.5.12

When
switch

board.
er

switch

nect

cessors,

When
logically
the

and

5.5.12.1

Power

Control

the

will

Then,

switch

signal,

signals.

it

the

circuits

the

AC

Power

The

power

connected

When
or

the

trol

circuits,

The

power

sistor
is

immediately

the

SW

switch

the

power

Horizon

activate

when

signal,

they

When

will

disconnect

Horizon

the

same

remain

LED

Switch

switch

to

the

power

4.8

volt

switch

R63,

and

signal

are

stretched

controller

Circuits

Nxt

is

tured

the

circuits

the

power

and

begin

will

prepare

the

power

the

Nxt

is

plugged

as

when

it

powered

indicator

are

Circuit

is a simple

ground.

The

switch

battery

thus

capacitor

asserted.

for

pack,

enabling

is

also

approximately

to a usable

EPLD,

off

that

supply

normal

operation.

the

Horizon

controller

main

battery. At

into

is

not

plugged

when

the

active.

membrane

other

is

pressed,

to

VBKUP.

the

subsequent

connected

C64.

When

When

U8.

and

not

plugged

apply

main

applies

VCC

battery

to

The

Nxt

for

EPLD

an

Horizon

AC

in,

receives

this

power

except

Nxt

switch

side

is

connected

Q36 immediately

VBKUP

stages

through

the

the

switch

500

milliseconds.

length

of

diode

power

is

released,

time.

into

an

AC

power

power

the

next time

power-down,

to

the

processors,

the

processors

and

battery-disconnect

point,

is

the

source,

that

turned

located

through

power-up

the

off,

on

applies

then

powers

of

the

power-up

CR20

switch

is

R63

instrument

electronics

but

the

diode

power

to

the

pressed,

and

Therefore,

The

SW

signal

source,

power

they

will

activate

will

and

remain

only

the

front

key

CR21

from

the

remainder

process.

input

of

the

C64

delay

short

pulses

is

routed

pressing

supply

detect

signals

and

detect

the

an

their

battery-discon-

from

be

unpowered

active

power-down

powered.

main

battery

panel,

to

the

with

gate

of

VSUPPLY,

of

the

comparator

comparator

the

deactivation

from

the

to

both

processors

the

power

to

the

main

active

pow-

power

both

pro-

again.

proceeds

That

charger

one

side

FET

Q36.

VBATT,

power

U26D,

output,

SW,

power

is,

con-

re-

of

and

、 j

§.5.12.2

The

ferent

©

connection
various
EPLD

CONVBATT

lisecond

Q36,
the
by

CR31.

ever,

the

port

both
battery,

The

Power

Controller

power

functions.

input

detects

delay,

which

power

FET

Q19,

The

the

processors

instrument

pin

P06,

processors

unless

EPLD

EPLD

controller

of

ine

electrically

It

controls

4.8

conditions,

the

SW

signals.

which

connects

the 4.8

switch, and

which

next

enables

press

will

for

power-down,

and

the

pump

have

the

backup

activates

the

the

volt

battery

and

it

signal

is

during

The

CONVBKUP

induced

volt

the

power-up

FET

of

the

power

interpret

processor

asserted

alarm

backup

programmable

connection

pack

to

VBKUP,

performs

by

battery

address

the

power-up

resistor

pack

process

Q35,

which

switch

the

key

the

management

will

their

disconnect

has

been

alarm

S-

via

14

the

logic

of

the

12

it

decoding

process,

signal

turns

R12

and

to

VBKUP.

will

continue.

connects

will

not

normally

press

as a request

processor

assert

the

DISCONB

signals,

activated,

BKUPALARM

device

volt

activates

(EPLD),

battery

the

for

it

asserts

on

FET

Q]

capacitor

At

this

The

VBATT

affect

for

will

the

EPLD

and

it

will

signal

U8,

performs

to

VSUPPLY,

backup

the

pump

after

C6.

point,

alarm

processor.

the

CONVBKUP

an

approximate

FET

Q1

the

operator

CONVBATT

to

VSUPPLY

the

EPLD

power-down.

assert

the

DISCONA

signal

disconnect

via

will

disconnect

port

the

whenever

several

it

controls

in

response

When

then

enables

can

signal

is

through

directly.

After

preparing

pin

P5.7.

the 4.8

main

battery.

both

CONVBK-

950500

Rev E (06/00)

dif-

the

to

the

and

the

50

mil-

FET

release

inverted

diode

How-

signal

via

When

volt

Horizon

Nxt®

Service

UP
alarm

is

signal,

serted

battery

are

Manual

and

RESET

circuit,

first

turned

LATALARM,

will

described below.

and

prior

on.

cause

the

are

asserted.

to

The

the

main

Therefore,

the

chime

EPLD

is

EPLD

battery.

also

asserted.

to

LATALARM

RESET

from

the

primary

activates

Pressing

immediately

the

backup

the

power

silence

is

asserted

normally

alarm

circuit,

alarm

switch

the

alarm,

under

causes a short

when

an

unplugged

whenever

after

and

four

the

LATALARM

disconnect

different

beep

from

EPLD

latched

has

both

the

conditions,

the

backu-

instrumen.

output

been

as-

4.8

volt

which

CONDITIONS

1.

2.

3.

4.

The

537RAM,

tion.
not

when

§.5.12.3

The

vatious

the

The

SET
power-up
the
See
whenever
watchdog
cessor,

option

ed

The

pump

The

management

Comparator

disconnect
An

extraneous

causes

EPLD

of

also

is

Therefore,

available,

the

EPLD

Power

Supervisory

691

power

input

time-of-day

691

constantly

line

if

VCC

and

overvoltage

the

Section

its
circuit

via

port

connector

to

the

691

RESULTING

processor

processor

U26C

the

generates a DEADBATT

main

battery,

RESET

extraneous

decodes

routed

to

directly

the

537RAM

avoid

supervisory

is

powered

the

Circuit

conditions

circuit.

monitors

falls

below

during

subsequent

detection

entitled

watchdog

is

pin

either

“Overvoltage

circuit
normally
P6.0. A reset

low

watchdog

IN

LATALARM

issues

an

ALARMON

issues a SHUTDOWN

to

protect

signal

RESET’s

addresses

to

is

generated

are

for

the

pump

output

possibility

by

the 4.8

circuit,

and

controls

VCC,

4.5

to

4.75

negative

circuit

whenever

times

prevented

can

or

high

input,

along

SIGNAL

signal, via

signal.

it

from

permanent

after

the

described

the

pump

processor

line

is

of

sourcing

volt

U5,

performs

backup

and

generates a minimum

volts.

Detection

out.

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from

also

be

for

1.6

with

the

in

the

processor.

forced

an

battery.

several

power

Therefore,
glitches
VCC

on

exceeds

Circuit.”

watchdog

timing

forced

seconds.

watchdog

port pin

signal,

via

DEADBATT

damage.

normal

Power

power-up

Supervisory

The

RAM

low

and

by

the

the

unpowered

functions.

for

the

management

RESET

the

VCC

5.32

to

The

time-out

out

by

pulses

by

holding

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normally

input

signal

P5.2.

port

pin

also

RESET.

single

RESET

ASIC,

decoded

without

line

component

It

generates

35

millisecond

is

always

line.

Reset

5.6

volts

for

691

also

asserts

period

generated

the

TESTRESET

open-circuit

from

P02.

causes

the

The

Circuit

section.

output,

diode

whenever

through

processor

an

resets

RAM

reset

on

asserted

is

also

generated

4-15

milliseconds.

the

RESET

is

1.6

seconds.

by

the

pump

line

line

the

pump

EPLD

to

possible

protec-

VCC

is

input

pin

under

and

the

RE-

on

initial

by

line

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pro-

from

the

is

connect-

processor.

Both

VCC

and

the 3 volt

691

connects

RAM,

enables a separate
VMEM.

the

volt

U10,

RESET

battery

maintain
to

one

of

VCC

and

the

However,

signal,

power

the

current

the

management

battery,

to

the

VMEM

time-of-day

PNP

transistor,

when

VCC

and

switches

is

sufficient

time

in

processor

BT2,

line,

integrated

Q5,

falls

below

the 3 volt

to

maintain

the

time-of-day

RAM

5-15

are

connected

which

circuit,

which

the

battery

the

integrated

enable

to

provides

U18.

provides

voltage

level

power

data

in

inputs

the

691.

power

additional

the

circuit.

to

The

691

of

the 3 volt

onto

the

management

The

in

order

During

the

BATON

current

normal

management

from

battery,

VMEM

processor

RESET

to

inhibit

operation,

output

the

the

line

instead.

line

is

writes

when

950500

the

processor

signal

VCC

RAM

691

asserts

also

routed.

also

line

The

and

to

3

to

VCC

Rev E (06/00)

is...

~

Horizon

Nxt®

Service

low.

Manual

5.5.13

Voltage

Two

a

1029

through a red
Therefore,

power.

patators
thermistor

A2.5
which

comparators,

§.5.14

Pressure

The

VPRESS+
to

the

single
under
ode/resistor
software

details

References

voltage

integrated

LED

The 5 volt

inside

in

volt

reference

is

powered

Signal

pressure

and

A/D

converter

ended

control

clamping

controlled

imposed

references

circuit,

indicator

D1

the

the

temperature

U26A

signal

LED,

provides

reference

management

voltage

by

VBKUP.

and

Circuits

circuits

VPRESS-,

inside

signal

of

by op

the

pump

matrix,

level

on

relatively

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supplied

CR35,

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D1,

and a voltage

an

“ON”

is

used

processor,

control

is

generated

The

U26C.

receive

and

perform

the

pump

amp

U22B.

processor..

and

presented

shifting

and

large

on

the

main

is

powered

dropping

indication

by

the

A/D

converter

the

offset

circuit.

by a 2425

2.5

volt

reference

the

differential

several

processing

processor.

Then

the

The

shifted

to

the

amplification

scale

pressure

board. A 5 volt

by

V+.

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resistor,

for

service

DAC

precision

is

output

technicians

inside

used

the

in

the

virtual

by

signal

operations

The

differential

single

ended

and

amplified

A/D

converter

allows

signal

signal

the

pump

waveforms

reference

source

R38,

pump

current

before

pressure

ground

the

LOWBATT

from

the

before

input

signal

is

level

signal

is

inside

processor

with

voltage

from

reaching

without

processor,

signal

pressure

using

circuits,

integrated

and

presenting

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shifted

then

routed

the

pump

increased

processor.

to

examine

is

generated

V+

passes

the

1029.

additional

the

analog

circuit,

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transducer,

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converted

and

amplified

com-

and

the

VR2,

results

to

through a di-

The

minute

resolution.

by

a

y

À

§.5.15

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offset
erated

able

U21B

5.5.16

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the

path
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cessive

§.5.17

The

U18,
and

Variable

pump

Level

processor

voltage

from

the 5 volt

offset

voltage

is

subtracted

Variable

pump

level

of

Time

main

year.

Gain

processor

shifted

op

amp

the

gain

by

means

voltages.

of

Day

board

with a separate

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Shifter

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half

of a 7528

for

the

level

shifting

reference

between

from

zero

the

single

Amplifier

uses

the

other

pressure

U21A

can

be

signal

instead
varied

of

from

of a diode/resistor

Refer

to

Chapter

maintains

time-of-day

the

32.768K
select

current

Hz

dual

DAC,

process. A -3.84

voltage

and

by a variable

its

line,

by

3.84

volts,

ended

half

input

pressure

of

the

path,

256/255

matrix,

7,

Section

time

crystal.

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TOD,

op

amp

7528

amount.

the

to

256/1.

to

7.7.1.1,

by

means

is

U23,

volt

reference

U25A.

in

15

millivolt

signal

dual

DAC,

Since

gain

is

inversely

.The

protect

1202
generated

the

“Testing

of a 1202

counts

and

op

amp

U21B

voltage

This

allows

increments.

by

op

amp

U23,

the

DAC

the

U25B.

and

is

proportional

output

and

of

the

variable

A/D

inside

the

serial

seconds, minutes,

latched

the

Pressure

timekeeper

in

to

generate a variable

for

the

DAC

DAC

to

The

offset

op

amp

inserted

to

gain

pump

the

processor

Transducer

integrated

hours,

ASIC.

input

is

gen-

generate a vari-

voltage

U21A

in

the

the

DAC

amplifier

from

to

amplify

feedback

setting.

is

from

A/D

Offset.”

circuit,

day,

month,

It

is

controlled

ex-

5-

16

950500

Rev E (06/00)

Horizon

Nxt®

Service

by

bit

VO

space.

not

available.

Manual

four

of

the

The

command

1202

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byte

powered

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is

by

VMEM,

located

at

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address

is

backed

2200

hex

up

with a 3

in

the

volt

management

battery

when

processor

VCC

1.

5.5.18

5.5.18.1

Audible

Primary

Both

alarm

circuit,

amp
minal
a

square

is

an

farad

diode
erate

farad

steady

cessor

processor

The
The

R33,
speaker

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PT6.

Alarms

Alarm

primary

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U15A,

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external 8 ohm

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receives a software

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wave

transmitted

exponentially

capacitor,

array

short

capacitor,

tone

port

speaker
amplified

series

current

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decay

time

C63,

effect.

pin

port

current

diode

C60

P03.

pin

P04.

speaker

CR33,

signal

audible

speaker.

is

fed

by a chime

controlled

from

decaying

are

volume

is

C64

is

sensed

current

waveform

both

used

to

is

charged

is

charged

by a series

storage

is

monitored

alarm

Itis

generator

controlled

pitch

signal

management

derived

connected

input

resistor.

control

waveforms,

generate

up

to a software

up

to a software

0.2

signal

is

routed

capacitor

by

the

circuits

driven

are

by a 7052

circuit.

volume

on

its

negative

processor

from a 1.5

to

the

positive

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1.5
for

longer

ohm

to a peak

C53,

decay

resistor,

and

management

provided

on

full

The

chime

control

input

port pin

microfarad

terminal

microfarad

maximum

time

volume

controlled

initial

controlled

R35,

detector,

drain

resistor

processor,

the

main

bridge

speaker

generator

signal

terminal.

P15.

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capacitor

of

op

capacitor,

chime

control

value

initial

and

value

amplified

consisting

RP15-6.
via

an

board.

driver

is

built

on

its

positive

The

volume

amp

U15A

C60,

effect.

waveforms,

by

management

by

-

by

op

of

series resistor

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analog

The

primary

integrated

around

input

ter-

pitch

signal

control

or a 10

signal

micro-

through

is

used

to

gen-

The

10

micro-

for

a

pro-

management

amp

U15B.

peak

detected

comparator

op

is

a

in-

5.5.18.2

§.5.19

The
against
microfarad
signal

5.32

Backup

The

backup
ALI.
power
the

the

ground

and
battery,
main

tacts

Overvoltage

Horizon

AL1

from

power

BKUPALARM

circuit

the

voltage

the

battery

on

the

Nxt

the

2.5
capacitor,

to

the

power

volts

and

Alarm

alarm

is

the

controller

uses

driven

VBKUP

EPLD,

signal.

for

voltage

by a 1026

doubler

backup

alarm

becomes

main PCB.

Detection

overvoltage

volt

voltage

C2.

fail

input

5.6

volts,

with a nominal

an

onboard

voltage

line.

The

U8.

See

The

BKUPALARM

doubler

are

powered

can

continue

discharged.

See

Figure

Circuit

detection

reference.

When

pin

VCC

of

VCC

the

or

external piezo

doubler

backup

U27

This

5-1,

circuit

reaches

691

value

5-17

alarm

the

Power

and piezo

by

VBKUP,

to

sound

alarm

Item

utilizes

is

scaled

the

power

of

5.46

sound

integrated

is

turned

circuit,

on by

Controller

signal

can

13.

sound
which

even

be

turned

turns

generator

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if

the

comparator

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voltage

trip

point

voltage,

supervisory

volts.

circuit,

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generator

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U27,

the

BKUPALARM

EPLD

on

section

FET

Q23,

AL1.

backed

up

with

instrument

off

manually

U4D

to

divider

R5/R6,
comparator
U5.

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power

fail

built

in

oscillator,

which

receives

input

signal

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compare a scaled

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output

completes

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pin

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volt

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a

|

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Horizon

Nxt®

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Manual

5.6

AIR-IN-LINE

Air

bubbles

two

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ergized
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tosensor.

AIL

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light

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cause

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ator
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pin

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reference,

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BOARD

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the

line

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determine

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TESTAIL

signal

signal

emitted

the

by

AIL

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is

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the

691

power

on

VCC

controller

detection

the

power

by

supervisory

with

sufficient

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reset

signal

controller

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ASSY.

are

detected

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refraction

signal

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pair,

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TESTAIL

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the

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on

the

main

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is

working.

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output

AILTESTSEN

U8,

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means

pairs,

air

is

board.

circuit

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activate

designed

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voltage

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guaranteed

of

the

with

of

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on

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longer

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the

line.

used

on.

high

when

limiting

to

The

to

light

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together.

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alarm.

voltage

alarm

block.

detect

spikes

than

15

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resistors.

air

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In

normal

test

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the

operation

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photosensor

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AIL

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milliseconds.

powered

with

air-in-line

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input

block

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pair,

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power

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the

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the

main

board

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on.

any

positive

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PCB

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to

detect

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which

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from

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and

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infrared

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en-
by

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5.7

SYSTEM

5.7.1

Power-up

The

plugged
The

Key
circuit
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from

mains

If

by

ply,
the

software
are

At

cator

the

OPERATION

Horizon

in,

the

management

on

the

key

to

prevent a watchdog

the

door

the

management

blank.

the

pump

the

4.8

is

volt

energizing

main

board

control,

the

same.

this

point,

is

turned

management

Nxt

has

two

power

panel

processor

No

not

backup

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pump

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turns

processor.

messages

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processors,

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the

door

processor

on

again.

processor

powered-up

powers-up

processors

be

pressed.

reset.

on

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The

are

sent,

in,

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the

causes

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If

the

causes

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pump

both

battery

the

conditions.

the

system

initialize

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pump

The

management

single

LCD

and

green

contrast

no

other

POWER

the

main

regulator

detect

supply

reset

by

the

is

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indicators

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the

and

their

processor

processor

AC

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voltage

processes

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pressed,

battery

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generating

that

the

POWER

on.

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management

running

pump

the

internal

is

off

microprocessor

memories,

continuously

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indicator

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active.

the

to

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this

point,

processor,

on

the

main

to

switch

to

and

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pulses

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waits

turned

power

the

whole

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pressed.

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the

the

reset

for

on,

so

control

connected

system.

or

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the

battery, a later

indicate

BATT.

and

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the

power

line

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the

supervisor

to

the

first

command

LCD

display

circuitry,

to

the

power

This

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message

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running.

POWER

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re-

powered

sup-

starts

up

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actions

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indi-

from

5-

18

|

950500

Rev E (06/00)

Horizon

Nxt®

Service

Manual

Both

main

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backed
data

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board

contents.

the 3 volt

of

processors

to

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the

time-of-day

Any

memory

battery,

sure

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internal

failure results

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stores

its

contents

clock

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and

external

in a system

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have

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RAM

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date

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memories

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time

when

The

The

the

data

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pump

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management

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as

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program

RAM

last

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processor

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battery

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Messages

messages

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alarm

alarm

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door

motor

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management

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the

Once

state,

5.7.2

processor

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driver

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pump

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home

management

Data

messages

exchange

all
and

Hold

State

start

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detect

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if

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either

Refer

processor

and

the

position

processor

displayed

Menu

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start

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power-up

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Operation

testing has

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software

sound

initializes

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Alarm

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air-in-line

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chime

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Code

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number

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commands

the

data

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and

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audible

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work

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sound

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of

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mechanism

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or

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there

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pump

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the

audible alarm.

the

backup

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circuits

in

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at

processor

management

values.

voltage

The

and

management

“ERR”

are

message

no

alarms,

processors.

happens,

alarm

B:

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encoder...

5-21

©

950500

Rev E (06/00)