Avery Berkel CX20 SERIES User manual

CX20, CX30 AND CX34 SERIES
RETAIL SCALES
CX30 TK
CX30
CX34
CX20W
CX9/A702
CX20
76101–452 Issue 2/02.03.95

i
CX20/CX30/CX34 Service Manual
Contents
Table of Contents:
About This Manual
Amendment Sheet
Abbreviations
Overview
1 Introduction 1–1
1.1 General 1–3
1.1.1 CX20 1–4
1.1.2 CX20 W 1–5
1.1.3 CX30 1–5
1.1.4 CX30 TK 1–6
1.1.5 CX34 1–6
1.2 General Data 1–7
2 General and Technical 2–1
2.1 Mechanical Description 2–3
2.1.1 CX20/CX30 2–3
2.1.2 CX20 W and CX9/A702 2–7
2.1.3 CX34 2–11
2.2 Electrical Description 2–13
2.3 Networking 2–14
2.4 Built–in Test Equipment 2–14

Contents
ii CX20/CX30/CX34 Service Manual
3 Disassembly and Assembly 3–1
3.1 Introduction 3–3
3.2 Servicing the CX20/CX30 3–3
3.2.1 Removing the case 3–3
3.2.2 Fitting the case 3–4
3.2.3 Replacing the keyswitch 3–4
3.2.4 Replacing the DCU/remote keyboard connector 3–4
3.2.5 Replacing the LCD (CX20) 3–5
3.2.6 Removing external connector plate 3–6
3.3 Servicing the CX20 W and CX9/A702 3–8
3.3.1 Removing the case (CX20 W) 3–8
3.3.2 Fitting the case (CX20 W) 3–9
3.3.3 Replacing the keyswitch (CX20 W) 3–9
3.3.4 Replacing the DCU/remote keyboard connector (CX20 W) 3–9
3.3.5 Replacing the LCD (CX20 W) 3–10
3.3.6 Removing external connector plate (CX20 W) 3–10
3.4 Servicing the CX34 3–12
3.4.1 Removing the housings 3–12
3.4.2 Fitting the housings 3–13
4 Installation (CX20 W) 4–1
4.1 Introduction 4–3
4.2 Installation 4–3
4.2.1 Approvals and stamping 4–4
5 Setting Up Procedures 5–1
5.1 Introduction 5–4
5.2 Service mode 5–5
5.2.1 Entering service mode using the SAC number 5–5
5.2.2 Entering service mode using the DIL switch 5–7
5.3 Configuration (Menu Option) 5–7
5.4 Calibration (Menu Option) 5–7
5.5 Clear Memory (Menu Option) 5–8
5.6 Format Memory (Menu Option) 5–9
5.7 Test Weight (Menu Option) 5–10
5.8 Test Diagnostics (Menu Option) 5–10
5.9 SAC Number (Menu Option) 5–11
5.10 Print Density (Menu Option) 5–12
5.11 Label Formats (Menu Option) 5–13
6 Configuration 6–1
6.1 Introduction 6–3
6.2 Configuration procedure 6–3
6.2.1 Configuring the machine 6–3
6.2.2 Configuration Option Tables 6–5

Contents
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CX20/CX30/CX34 Service Manual
7 Calibration and Adjustments 7–1
7.1 Introduction 7–3
7.2 Adjustment of Overload Stops (CX20/CX30) 7–3
7.2.1 Adjustment of Asymmetric Overload Stops 7–3
7.3 Adjustment of Overload Stops (CX9/A702) 7–3
7.4 Adjustment of Overload Stops (CX34) 7–3
7.5 Calibration 7–4
8 Testing 8–1
8.1 Introduction 8–3
8.2 Date/time Entry (Menu Option) 8–4
8.3 Scale Test (Menu Option) 8–5
8.3.1 Processor test (menu option) 8–6
8.3.2 Static RAM test (menu option) 8–7
8.3.3 ROM test (menu option) 8–8
8.3.4 EEPROM test (menu option) 8–9
8.3.5 Display test (menu option) 8–10
8.3.6 Keyboard test (menu option) 8–11
8.3.7 Comms test (menu option) 8–13
8.3.8 Weighing test (menu option) 8–15
8.4 System Load Test (Menu Option) 8–16
8.4.1 Loading the system 8–16
8.4.2 Measuring on the machine 8–18
9 Label Formats 9–1
9.1 Introduction 9–3
9.2 Labels 9–4
9.2.1 Label format 9–4
9.2.2 Label fields 9–5
9.2.3 Label field co–ordinates 9–6
9.2.4 Label start point 9–7
9.2.5 The offset (90 and 180 degree formats only) 9–8
9.2.6 Determining the Start Point of a 90 Degree Format 9–9
9.2.7 Determining the Start Point of a 180 Degree Format 9–10
9.2.8 Text fonts 9–11
9.2.9 References 9–11
9.3 Creating a New Label Format 9–12
9.3.1 Design 9–12
9.3.2 Determining the label field co–ordinates 9–13
9.3.3 Programming 9–13
9.3.4 Example – creating a new 0 degree label format 9–14
9.4 Edit Format (Menu Option) 9–20
9.5 Clear Format (Menu Option) 9–25
9.6 Copy Format (Menu Option) 9–26
9.7 Print Format (Menu Option) 9–27

Contents
iv CX20/CX30/CX34 Service Manual
10 Error Messages 10–1
10.1 Commodity Display Error Messages 10–3
10.2 TEST REPORT Error Number 10–13
11 Main PCB 11–1
11.1 Description 11–3
11.2 Servicing 11–6
11.2.1 Removing the main PCB (CX20/CX30) 11–6
11.2.2 Fitting the main PCB (CX20/CX30) 11–6
11.2.3 Removing the main PCB (CX20 W) 11–10
11.2.4 Fitting the main PCB (CX20 W) 11–10
11.2.5 Removing the main PCB (CX34) 11–11
11.2.6 Fitting the main PCB (CX34) 11–11
11.2.7 Replacing the main PCB 11–14
12 Display (CX20) 12–1
12.1 Description 12–3
12.2 Testing 12–4
12.3 Servicing 12–5
12.3.1 Removing an integral display PCB 12–5
12.3.2 Fitting an integral display PCB 12–5
12.3.3 Removing a tower mounted display PCB 12–6
12.3.4 Fitting a tower mounted display PCB 12–6
13 Display (CX30/CX34) 13–1
13.1 Description 13–3
13.2 Testing 13–5
13.3 Configuration Data 13–5
13.4 Servicing 13–10
13.4.1 Removing a display PCB (CX30) 13–10
13.4.2 Fitting a display PCB (CX30) 13–10
13.4.3 Removing a display assembly (CX30) 13–11
13.4.4 Fitting a display assembly (CX30) 13–12
13.4.5 Removing a display PCB (CX34) 13–12
13.4.6 Fitting a display PCB (CX34) 13–13
14 Keyboard 14–1
14.1 Description 14–3
14.2 Testing 14–4
14.3 Servicing 14–4
14.3.1 Removing a keyboard (CX20/CX30) 14–4
14.3.2 Fitting a keyboard (CX20/CX30) 14–5
14.3.3 Removing a keyboard (CX34) 14–5
14.3.4 Fitting a keyboard (CX34) 14–6
15 CX30 TK Machine 15–1
15.1 General 15–3
15.2 Mechanical Description 15–3
15.3 Electrical Description 15–4

Contents
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CX20/CX30/CX34 Service Manual
15.4 Keyboard Controller PCB 15–4
15.4.1 Circuit description 15–4
15.4.2 Power Supplies 15–4
15.4.3 Links 15–5
15.5 Servicing 15–8
15.5.1 Removing the customer keyboard 15–8
15.5.2 Replacing the customer keyboard 15–8
15.5.3 Removing the keyboard controller PCB 15–8
15.5.4 Fitting the keyboard controller PCB 15–9
15.5.5 Removing the keyboard assembly 15–9
15.5.6 Fitting the keyboard assembly 15–9
15.5.7 Removing the switch PCB loom 15–10
15.5.8 Fitting the switch PCB loom 15–10
16 Power Supply Unit 16–1
16.1 Description 16–3
16.2 Servicing 16–4
16.2.1 Gaining access to the power supply unit (CX20/CX30) 16–5
16.2.2 Gaining access to the power supply unit (CX34) 16–6
16.2.3 Replacing a fuse 16–7
17 Transducer 17–1
17.1 Description 17–3
17.1.1 Transducer Assembly CX20/CX30 17–3
17.1.2 Transducer Assembly CX34 17–4
17.1.3 Suspension Assembly CX34 17–4
17.2 Testing 17–6
17.3 A/D PCB 17–6
17.4 Servicing 17–7
17.4.1 Removing the transducer (CX20/CX30) 17–7
17.4.2 Fitting the transducer (CX20/CX30) 17–7
17.4.3 Removing the transducer (CX34) 17–7
17.4.4 Fitting the transducer (CX34) 17–8
18 CX9/A702 Remote Weighing Platform 18–1
18.1 Description 18–3
18.2 Specifications 18–5
18.3 Servicing 18–5
18.3.1 Special Tool (15221) 18–5
18.3.2 Removing a transducer 18–5
18.3.3 Fitting the transducer 18–6
18.3.4 Using the C117 Special Tool 18–8
19 Receipt Printer 19–1
19.1 Description 19–3
19.2 Test and Adjustment 19–4
19.3 Servicing 19–4
19.3.1 Removing the printer (CX20/CX30) 19–4
19.3.2 Fitting the printer (CX20/CX30) 19–5
19.3.3 Removing the printer (CX34) 19–5

Contents
vi CX20/CX30/CX34 Service Manual
19.3.4 Fitting the printer (CX34) 19–6
19.3.5 Cleaning the print head 19–6
19.3.6 Changing the print head 19–6
19.3.7 Changing the microswitch 19–7
19.3.8 Disassembling the printer 19–7
19.3.9 Assembling the printer 19–7
20 Label and Receipt Printer 20–1
20.1 Description 20–3
20.2 Test and Adjustment 20–5
20.3 Servicing 20–6
20.3.1 Removing the printer (CX20/CX30) 20–6
20.3.2 Fitting the printer (CX20/CX30) 20–6
20.3.3 Removing the printer (CX34) 20–7
20.3.4 Fitting the printer (CX34) 20–7
20.3.5 Cleaning the print head 20–7
20.3.6 Changing the take–up motor 20–7
20.3.7 Changing the stepper motor 20–8
20.3.8 Changing the friction roller 20–8
20.3.9 Changing the print head 20–9
20.3.10 Changing the photodetector 20–10
20.3.11 Changing the printer mechanism 20–10
21 Networking 21–1
21.1 Networking 21–3
21.1.1 Network cabling 21–4
22 Communications Controller 22–1
22.1 Description 22–3
22.1.1 C918 external comms controller unit 22–4
22.2 Network Connections 22–4
22.2.1 Dual comms controller operation 22–5
22.3 Comms PCB – Main Components 22–6
22.4 Servicing 22–10
22.4.1 C918 external comms controller unit 22–10
23 RS232 Interface PCB (CX20 W) 23–1
23.1 General 23–3
23.2 Circuit Description 23–4
23.2.1 RS232 interface 23–4
23.2.2 Wrapper control signal interface 23–4
23.2.3 Wrapper ready signal (control interface version 2 only) 23–4
23.2.4 Scale in control signal (control interface version 2 only) 23–5
23.2.5 Analogue interface 23–5
23.2.6 ”Wrapper Start” relay control 23–5
23.2.7 Label taken detection 23–5
23.2.8 ULMA 200 series wrapper protocol 23–6
23.2.9 Serial interface devices 23–6
23.3 Servicing 23–7
23.3.1 Replacing the RS232 interface PCB 23–7

Contents
vii
CX20/CX30/CX34 Service Manual
24 Wiring Interconnections 24–1
24.1 CX20/CX30 24–3
24.2 CX20 W 24–8
25 Appendices 25–1
25.1 Configuration Option Tables for Old Software 25–3
25.1.1 Option Tables for Mod.3 Software Release 25–3
25.1.2 Option Tables for Pre–Phase 1.2 Software Release 25–7
25.2 Label Formatting 25–17
25.2.1 Calculating the offset 25–17
25.2.2 Field data tables 25–18
Parts List
List of Figures
Figure 1.1 General View (Integral Displays) 1–4
Figure 1.2 General View (Column–mounted Displays) 1–4
Figure 1.3 General View (CX20 W) 1–5
Figure 1.4 General View (CX30) 1–5
Figure 2.1 Exploded View (CX20) – R Version 2–3
Figure 2.2 Exploded View (CX30) – LS/ECR Version 2–4
Figure 2.3 Scale Base – Plan View (CX20/CX30) 2–6
Figure 2.4 ULMA Wrapping Machines 2–7
Figure 2.5 Exploded View (CX20 W) 2–8
Figure 2.6 Exploded View (CX9/A702) 2–9
Figure 2.7 Scale Base – Plan View (CX20 W) 2–10
Figure 2.8 Exploded View (CX34) 2–11
Figure 3.1 Unit Interior (CX20) – View on Front, Right Corner 3–5
Figure 3.2 External Connector Plate – View from above 3–7
Figure 3.3 External Connector Plate (CX20 W) – View from above 3–11
Figure 5.1 Service Mode Flowchart 5–3
Figure 5.2 Menu in Service Mode 5–4
Figure 8.1 Menu of Test Diagnostics (Service Mode) 8–3
Figure 8.2 Menu of Scale Test 8–5
Figure 8.3 Link Fittings to Echo Plugs (D–type Connectors) 8–13
Figure 9.1 Label Formats Menu 9–3
Figure 9.2 Sample Label and Label Fields – 0 Degree Format 9–5
Figure 9.3 Label Start Points (0, 90 and 180 Degree Labels) 9–7
Figure 9.4 Effect of the Offset (90 Degree Label) 9–8
Figure 9.5 Determining the Start Point (90 Degree Format) 9–9
Figure 9.6 Determining the Start Point (180 Degree Format) 9–10
Figure 9.7 Example of Completed Field Measurements Table 9–18
Figure 9.8 Example of Completed Programmed Data Table 9–19
Figure 9.9 Co–ordinates (Commodity Display) 9–20
Figure 11.1 Main PCB – Electrical Connections 11–4
Figure 11.2 Main PCB – DIL Switches and Potentiometers 11–8
Figure 11.3 Main PCB – Location of Links 11–12
Figure 11.4 Main PCB – Location of Integrated Circuits 11–15
Figure 12.1 Display – FIP Type (CX20) 12–3

Contents
viii CX20/CX30/CX34 Service Manual
Figure 12.2 Display Brackets 12–4
Figure 13.1 Display (CX30) 13–3
Figure 13.2 Display (CX34) 13–4
Figure 13.3 Display PCB (Metric Multi–line) 13–4
Figure 13.4 Display PCB – Switches and LEDs 13–5
Figure 13.5 Display (CX30) – Exploded 13–11
Figure 14.1 Keyboard 14–3
Figure 14.2 Keyboard Earthing Arrangement 14–6
Figure 15.1 Keyboard Controller PCB – Communication Loom Connections 15–5
Figure 15.2 Keyboard Controller PCB – Links 15–6
Figure 15.3 Keyboard Controller PCB – Pin Signals 15–7
Figure 16.1 Power Supply PCB – Component Highlight 16–3
Figure 17.1 Transducer Assembly (CX20/CX30) 17–3
Figure 17.2 Suspension Assembly (CX34) 17–5
Figure 17.3 A/D PCB Connections (component side) 17–6
Figure 18.1 CX9/A702 Remote Weighing Platform 18–3
Figure 18.2 CX9/A702 – Exploded View 18–4
Figure 18.3 Special Tool (15221) 18–5
Figure 18.4 Removing the transducer using the 15221 18–6
Figure 18.5 Fitting the transducer using a 15221 18–7
Figure 18.6 Special Tool (C117) 18–8
Figure 18.7 Using the Special Tool (C117) 18–8
Figure 19.1 Ticket Printer (CX20/CX30) 19–3
Figure 20.1 Label and Receipt Printer (CX20/CX30) 20–3
Figure 21.1 Network Connections 21–3
Figure 21.2 Cable Screen Connection 21–4
Figure 22.1 Network Connections (with Communications Controller) 22–4
Figure 22.2 Comms PCB – Component Highlight 22–6
Figure 22.3 Comms PCB – Links LK1, LK6, LK7 22–8
Figure 22.4 Comms PCB – Switch Settings 22–9
Figure 23.1 RS232 Interface PCB 23–3
Figure 24.1 Connector Pins on Main PCB – PL6, PL8 and PL13 24–3
Figure 24.2 Connector Pins on Main PCB – PL2, PL9, PL12 and PL15 24–4
Figure 24.3 Connector Pins on Main PCB – PL7, PL14, PL17, PL18 and SK1 24–5
Figure 24.4 Connector Pins on Main PCB – PL20, PL19 and PL16 24–6
Figure 24.5 Connector Pins on Main PCB – PL3 24–7
Figure 24.6 PCB Interconnection Diagram (CX20 W) 24–8
Figure 24.7 Connector Pins on RS232 PCB (CX20 W) – PL1, PL2 and PL5 24–9
Figure 24.8 Connector Pins on RS232 PCB (CX20 W) – PL3, PL4, PL7,
PL8, TB1 and TB2 24–10

About This Manual
ix
CX20/CX30/CX34 Service Manual
This manual has been prepared to assist in after sales service by providing information on
the installation, maintenance and repair of the equipment.
It is suggested that the Manual is studied carefully and familiarised, particularly the sections
listing major components, test points and adjustment available. The Manual can then be
used as a reference book by referring to the detailed contents page to obtain the
information required.
The Parts List should also be studied and it is recommended that parts are ordered in
advance for stock purposes in order to accommodate future service requirements.
The Manual is not a replacement for training but should be used to supplement training
courses, which take place at our Service Training Centre or, alternatively, within the Service
Regions and Overseas Territories.
Amendments will be issued as necessary. To ensure that your Manual is up to date the
Amendment Record Sheet must be completed as the amendments are made to the
Manual.
For further information on Service or Parts, please contact your nearest Avery Berkel dealer
or contact Avery Berkel Technical Support:
Avery Berkel Technical Support
West Bromwich Road
Tame Bridge
Walsall
West Midlands
WS5 4BD
Tel: [phone]
Fax: [phone]
NOTE:
This manual remains the property of GEC Avery Limited and must be returned to the Company on
request or if you should leave the Company’s employment.
Copyright , by GEC Avery Limited – Year: 1995 All Rights Reserved Worldwide. No part of this
publication may be reproduced, transmitted, transcribed, stored in a retrieval system or translated
into any language or computer language, in any form or by any means electronic, mechanical,
magnetic, optical, chemical, manual or otherwise, without the prior written permission of Avery
Berkel, Sertec House, West Bromwich Road, Tame Bridge, Walsall, West Midlands, WS5 4BD.

Amendment Sheet
xi
CX20/CX30/CX34 Service Manual
AMENDMENT DATE AMENDMENT DETAILS
1 1992 Draft 1: originated by sub–contractors (Cheltenham
Technical Publications).
2 Sep. 1992 Draft 2: conversion to Interleaf format and general
update.
3 Feb. 1994 Issue 1: general update to incorporate Phase 1.3
software release.
4 Oct. 1994 Figure 20.4 Comms PCB – Switch Settings on Page
20.10: switch settings for ”SW3: back–up controller
selected” reversed – they were incorrect.
5 Mar. 1995 Issue 2: amendments as per A/A 31167.
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

Abbreviations
xiii
CX20/CX30/CX34 Service Manual
% Per cent
°C Degrees Celsius
A Ampere
A/D Analogue to digital
ASIC Application specific integrated
circuit
AVR Automatic variable resolution
Comms Communications
DCU Data collector unit
DIL Dual–in–line (switch)
DMM Digital multimeter
DPE Data processing engine
(comms controller PCB)
DVM Digital voltmeter
ECR Electronic cash register
EEPROM Electronically, erasible,
programmable, read–only
memory
EPROM Erasible, programmable,
read–only memory
FIP Fluorescent indicator panel
FS# Circuit code: fuse number #
g Gram
Hz Hertz
I/O In/out
IC# Circuit code: integrated circuit
number #
in Inch
ISC Inter–scale communications
kg Kilogram
kV Kilovoltage
lb Pound (Imperial weight)
LCD Liquid crystal display
LED Light emitting diode
LK# Circuit code: link number #
LS Label (printer)
LSB Least significant bit
LSD Least significant digit
MC Memory controller
MEM Memory
MIN Minimum
mm Millimetre
MSB Most significant bit
MSD Most significant digit
NT Net (weight)
OP Operator (mode)
oz Ounce
PCB Printed circuit board
PL# Circuit code: plug number #
(electrical connector)
PLU Price look up
R Receipt (printer)
RAM Random access memory
RV# Circuit code: variable
resistance number #
SK# Circuit code: socket number #
SMPS Switched–mode power supply
SSD Static sensitive device
SW# Circuit code: switch number #
TP# Circuit code: testing point
number #
V Voltage
V# Circuit code: power transistor
number #
VA Volt–Ampere
Vac Voltage, alternating current
Vdc Voltage, direct current
W Watts

Overview
xv
CX20/CX30/CX34 Service Manual
SAFETY WARNINGS
Lethal Voltages
This equipment is supplied by a mains voltage which can cause electric shock
injury. Before removing the unit case or the covers of any remote units (for
example: displays, weighing platforms, customer keyboards etc.), disconnect
completely the mains power supply and ensure that it cannot be connected
inadvertently by other persons.
If the unit case or the covers of any remote units have been removed, do not
apply power to the unit unless specifically instructed to do so in these
instructions. When working on live equipment, exercise great care, use
insulated tools and test equipment, and do not work alone.
The capacitors in the power supply unit will hold a charge for a period of up to
six minutes after the power supply is switched off. During this time, do not
touch the unit. Do not attempt to discharge the capacitors by shorting their
terminals.
The power plug must be inserted in a socket outlet provided with a protective
earth contact. The electrical supply at the socket outlet must provide
over–current protection of 5 amperes. The socket outlet must be within easy
reach for isolation of the machine for cleaning and servicing.
Do not clean the machine or any remote units whilst it is switched on. For
cleaning use only a clean cloth moistened with water containing a small
amount of domestic detergent.

Overview
xvi CX20/CX30/CX34 Service Manual
SERVICE PRECAUTIONS
General
Before servicing a machine, it is recommended that the machine’s data is backed–up.
Refer to Part 2, Programming Handbook for use on Data Collector Units (DCUs).
Static Sensitive Devices
Almost all electronic integrated circuits, commonly known as ’chips’, are static sensitive
devices (SSDs). They will be destroyed if contaminated with static electricity.
When working with SSDs follow anti–static procedures which include:
the wearing of an anti–static wrist bracelet
making sure that the workbench is covered by a static–discharge mat
avoiding wearing nylon clothes
discharging any anti–static electricity which may be on your person by contacting an
earthed device before handling an SSD.
Keep an SSD in a bag made of an anti–static or conductive material. When shipping an
SSD, cover all the SSD contacts with an anti–static or conductive material (not polythene).
When shipping an assembly which contains SSDs, pack it securely in an anti–static bag.
Handling Procedures
The transducer in the machine or remote weighing platform is not protected against
negative overload. Do not lift the machine or remote weighing platform by the cross
assembly or transducer after the covers have been removed.
When the cross assembly, load stop or transducer are disassembled or otherwise removed,
handle the transducer with care. Do not exert physical force on it and do not attempt to
disassemble its component parts.
The strain pads and wires in the transducer are extremely sensitive. Do not attempt any
maintenance within the transducer and ensure that the strain wires are not damaged by
tools or other objects during maintenance, storage or shipment.
Main PCB
The main PCB has a battery installed on it to maintain memory data. If you are removing
the main PCB from the unit, the battery must be switched off (refer to procedures) to
prevent live parts of the PCB being shorted. Before switching off the battery, if possible, the
data contained in the machine should be backed–up (refer to Part 2, Programming
Handbook for use on the DCU). Although the battery supply is switched off, take great care
not to short the battery terminals during maintenance. After fitting a main PCB the battery
must be switched on.
Print Head
The thermal print head of the printer will be damaged if scratched with sharp objects (such
as a screwdriver or knife blade). When examining or servicing the print head, take care not
to damage it. If the print head requires cleaning, use only the cleaning kit specified in these
procedures.

Overview
xvii
CX20/CX30/CX34 Service Manual
C918 External Comms Controller Unit
The details for servicing the C918 are detailed in the following documetation:
C918 Service Safety Information, Part Number 76102–129
C918 User Safety Information, Part Number 76102–130
Any warnings, cautions or notes must be strictly observed.
ORDERING
New Parts
When ordering a new part, make sure that you use the correct part number. Before fitting,
make sure that its part number matches the part number of the part being removed (or is an
approved alternative).
PUBLICATION NOTES
User Handbooks
The engineer is advised to carry a copy of the User Handbooks for reference during
maintenance. The User Handbooks for each machine are divided into seven Parts: Parts 1
and 7 are machine specific and Parts 2 to 6 are common to each machine. The Parts are:
Handbook Part
Number Title of Handbook Machine Specific/Common
Part 1 Operators’ Handbook Machine specific
Part 2 Programming Handbook Common
Part 3 Networks and Operating Modes Common
Part 4 Management Totals Common
Part 5 Help Information Common
Part 6 Label and Barcode Formats Common
Part 7 Quick Reference Guide Machine specific
Fitting Instuctions – Column Mounted TK Keyboard
See Fitting Instructions for the Column Mounted TK Keyboard Kit, Part Number 76102–188.
Notation
In this publication, where a metric value is quoted, Continental notation is used (comma for
decimal separator, space for 000’s separator). Where an Imperial value is quoted, British
notation is used (full point for decimal separator, comma for 000’s separator). Where a
value is quoted which may be either metric or Imperial (such as a period of time or an
electrical value), Continental notation is used.

Overview
xviii CX20/CX30/CX34 Service Manual
THE CX20, CX30 AND CX34 SERIES OF SCALES
The CX20, CX30 and CX34 series of scales comprise the following machines:
Model Description
CX20 ECR Receipt only counter scale with electronic cash register functions;
integral vendor display with integral or column–mounted customer
display
CX20 LS Label and receipt counter scale; integral vendor display with integral
or column–mounted customer display
CX20 LS/ECR Label and receipt counter scale with electronic cash register
functions; integral vendor display with integral or column–mounted
customer display
CX20 R Receipt only counter scale; integral vendor display with integral or
column–mounted customer display
CX20 W Label only printing and indicating machine; used in conjunction with
remote weighing platform (modified CX9/A702) on Automatic Stretch
Wrapping machines
CX30 ECR Receipt only counter scale with electronic cash register functions;
column–mounted displays
CX30 LS Label and receipt counter scale; column–mounted displays
CX30 LS/ECR Label and receipt counter scale with electronic cash register
functions; column–mounted displays
CX30 R Receipt only counter scale; column–mounted displays
CX30 TK The CX30 LS counter scale with column–mounted or remote
customer keyboard (with modifications to the CX30 LS machine on
the column–mounted version)
CX34 R Receipt only hanging scale
CX34 LS Label and receipt hanging scale
CX34 LS/ECR Label and receipt hanging scale with electronic cash register
functions
All references to CX20, unless stated otherwise, apply to all machines in the CX20 range.
This rule also applies to the CX30 and CX34 ranges, accordingly.

1–1 CX20/CX30/CX34 Service Manual
Section 1
Introduction
Table of Contents:
1.1 General 1–3
1.1.1 CX20 1–4
1.1.2 CX20 W 1–5
1.1.3 CX30 1–5
1.1.4 CX30 TK 1–6
1.1.5 CX34 1–6
1.2 General Data 1–7

1 — Introduction
1–3
CX20/CX30/CX34 Service Manual
1.1 General
This manual provides service instructions for weighing scales of the CX20,
CX30 and CX34 series.
The units are electronic weighing, price computing and printing machines for
retail use. They are mains powered and can be operated as stand–alone units
or in a network. The units will interface with facilities such as:
cash drawer
data collector unit (DCU)
remote programming keyboard
remote operator’s keyboard
customer self–service keyboard
external printer
There are four main types of machine: receipt only (R); receipt only with cash
register functions (ECR); label and receipt (LS); and label and receipt with cash
register functions (LS/ECR). There are also customer self–service keyboard
(TK) and wrapping machine (W) versions.
Each machine can be programmed to configure the keyboard to suit the goods
and prices of the vendor. The keyboard face can be written on using an erasible
crayon. An audible tone sounds during keyboard operation and for certain
prompts and error messages.
The units, generally, feature a weighplate, keyboard, vendor and customer
displays, keyswitch and printer.
The keyboard has two modes of operation, serving customers and
programming, each having its own overlay.
The vendor and customer displays are at the front and rear of the machine,
respectively. Each comprises a number of display fields and annunciators which
provide information such as, weight, price, tare operation, commodity description
etc.
A keyswitch allows the selection of four modes of operation. There are three
keys used in the keyswitch:
OP key: provides access to OPerator and SUPERVISOR modes
X key: same as OP key; also provides access to System X and Machine X
programming menus
Z key: same as X key; also provides access to System Z and Machine Z
programming menus.
There are two types of printer, receipt(R) and label and receipt (LS). Both
printers are thermal type printers which print receipts and reports on a thermal
paper roll. The label and receipt printer also prints labels on a thermal label roll
and utilises a cassette for loading the paper. A number of these cassettes can
be retained for use, each loaded with different paper. Both printers can print
alpha characters, numeric characters and barcode graphics, when required.

1 — Introduction
1–4 CX20/CX30/CX34 Service Manual
1.1.1 CX20
The CX20 is a counter scale. Supplemental information is presented to the
vendor by a separate liquid crystal display (LCD) which is just below the printer.
Column–mounted displays are available as an alternative.
Figure 1.1 General View (Integral Displays)
Vendor display
Ticket mouth
LCD
DCU/external keyboard
controller
Keyswitch
Keyboard
Stamping plate
Spirit level
Rating plate
On/Off switch (below edge)
Adjustable foot (4)
Weighplate
Customer display
Figure 1.2 General View (Column–mounted Displays)
Vendor display
Ticket mouth
DCU/external
keyboard controller
Keyswitch
Keyboard
Stamping plate
Spirit level
Rating plate
On/Off switch (below edge)
Adjustable foot (4)
Weighplate
Customer display
Columns
Blank screen

1 — Introduction
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CX20/CX30/CX34 Service Manual
1.1.2 CX20 W
The CX20 W is an indicating and printing machine. It is used with a remote
weighing platform, a modified CX9/A702, on a range of Automatic Stretch
Wrapping machines. The CX20 W has no weighplate or customer display.
Figure 1.3 General View (CX20 W)
Vendor display
Ticket mouth
LCD
DCU/external keyboard
controller
Keyswitch
Keyboard
Stamping plate
Rating plate
On/Off switch (below edge)
Adjustable foot (4)
Label taken sensor
1.1.3 CX30
The CX30 is a counter scale with a head–up display arrangement mounted on
top of twin columns at the rear of the machine.
Figure 1.4 General View (CX30)
Vendor display
Ticket mouth
DCU/external
keyboard
connector
Keyswitch
Keyboard
Stamping plate
Weighplate
Adjustable foot (4)
Spirit level
Rating plate
On/Off switch (below edge)
Customer display