Cablescan 4000C User manual

CONTINUITY TESTER
MODEL 4000C
Cablescan

Model 4000C Instruction Manual Page iii
July 7, 2014
MODEL 4000C
INSTRUCTION MANUAL
(Part Number 5900330)
Cablescan
A Eubanks Company
3022 Inland Empire Blvd.
Ontario, California 91764
[phone] Fax [phone]
www.cablescan.com

Model 4000C Instruction Manual Page iv
COPYRIGHT NOTICE
This manual is proprietary, copyrighted material. No part of this manual may be reproduced or
transmitted in any form or by any means, electronic or mechanical, including photocopying and
recording, for any purpose other than the purchaser's personal use, without written permission of
Cablescan Inc.
Copyright 1996 - 2005 Cablescan Inc. All rights reserved.
THIS IS A LIMITED WARRANTY
CABLESCAN (hereinafter “CABLESCAN”) products are warranted to the original owner for a
period of twelve (12) months from the date of shipment from CABLESCAN’s factory, or in the
first 2,080 hours of operation by the customer (whichever comes first), to be free from defects in
material and workmanship for the use for which they are intended by CABLESCAN, under
normal operating conditions and maintenance.
CABLESCAN’s obligation under this Warranty is limited, upon prompt notification, to the
repair or exchange at the CABLECAN factory of any CABLESCAN product or part which
proves to be defective. If a product under warranty is returned to the CABLESCAN factory for
repair or replacement, freight charges will be borne by the customer in accordance with
CABLECAN’s policy of selling F.O.B. the CABLESCAN factory. If repairs are made at the
customer’s factory, the customer will bear the cost of the service person’s travel and living
expenses.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED
OR IMPLIED. THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. THIS WARRANTY STATES CABLESCAN’S
ENTIRE AND EXCLUSIVE LIABILITY WHETHER IN TORT OR IN CONTRACT AND
BUYER’S EXCLUSIVE REMEDY FOR ANY CLAIM FOR DAMAGES IN CONNECTION
WITH THE SALE OR USE OF CABLESCAN’S PRODUCTS, THEIR DESIGN,
SUITABILITY FOR USE, INSTALLATION OR OPERATION, OR FOR ANY CLAIMED
DEFECTS THEREIN. UNDER NO CIRCUMSTANCES WILL CABLESCAN BE LIABLE
FOR ANY CONSEQUENTIAL, INCIDENTAL, ECONOMIC, DIRECT, INDIRECT,
GENERAL, OR SPECIAL DAMAGES. NO ACTION UNDER THIS WARRANTY MAY BE
BROUGHT BY BUYER MORE THAN ONE YEAR AFTER THE CAUSE OF ACTION HAS
OCCURRED.
This warranty does not apply to equipment or replacement parts that have not been given proper
care and maintenance and does not cover any defect, failure, deficiency, or error that is:
a) Not reported to Cablescan within the applicable warranty period;
b) Due to accident, misapplication, negligence, modification, alteration, disassembly, abuse,
misuse, abnormal conditions of temperature, dirt, or corrosive matter; or
c) Due to operation, either intentional or otherwise, above rated capacities, or in an
otherwise improper manner.
If it is determined that the equipment defect is not the result of original manufacture but is
related to customer negligence or operational error, the customer will pay all incurred charges
including, but not limited to, parts and labor.

Model 4000C Instruction Manual Page v
TABLE OF CONTENTS
SPECIFICATIONS ............................................................................ x
General Description............................................................................ 1
Basic Configuration........................................................................................1
Optional Components.....................................................................................1
Main Chassis..................................................................................................1
Control Head..................................................................................................1
Floppy Disk Drive..........................................................................................1
Scanner Boards...............................................................................................2
Expansion Chassis..........................................................................................2
Lamp Driver (optional) ..................................................................................2
Printer (optional)............................................................................................2
Terminal Port..................................................................................................2
Functional Description....................................................................... 3
Basic Learn/Test Function .............................................................................3
Assembly Function.........................................................................................3
Program Storage on Floppy............................................................................3
Printout...........................................................................................................3
System Overview................................................................................. 4
Main Chassis..................................................................................................4
CPU/RAM Board..................................................................................4
I/O Board..............................................................................................4
Scanner Control Board.........................................................................4
Control Head..................................................................................................4
Overview of Operating Modes.......................................................................5
Learn Mode...........................................................................................5
Learn from Known Good............................................................5
Learn from Floppy Disk..............................................................5
Test Mode..............................................................................................5
Assembly Mode.....................................................................................5
Random Build .............................................................................5
Sequential Build..........................................................................5
Search Mode.........................................................................................6
Remote ..................................................................................................6
Record Mode.........................................................................................6
Record on Diskette......................................................................6
Record on Tape...........................................................................6
Print Mode............................................................................................6
Wire List .....................................................................................6
Error List.....................................................................................6
Optional Equipment .......................................................................................7
CRT/Keyboard Terminal ......................................................................7

Model 4000C Instruction Manual Page vi
Lamp Driver..........................................................................................7
Disk Controller Board..........................................................................7
Single Disk Drive System......................................................................7
Dual Disk Drive System........................................................................7
Printer...................................................................................................7
Controls and Indicators – Control Head.......................................... 8
Key-Selected Functions..................................................................................8
Reset......................................................................................................8
Test........................................................................................................8
Error List..............................................................................................8
Search...................................................................................................8
Seq. Build............................................................................................10
Random Build .....................................................................................10
Remote ................................................................................................10
From Tape ..........................................................................................10
Known Good.......................................................................................10
Menu Run............................................................................................10
Up/Down Arrows................................................................................10
Miscellaneous Controls................................................................................11
ENABLE Keyswitch............................................................................11
VOLUME Control...............................................................................11
PROBE Receptacle.............................................................................11
EARPHONE Jack ...............................................................................11
Indicators......................................................................................................11
Power Indicator Light ........................................................................11
Alphanumeric Display........................................................................12
Rear Panel Connections................................................................... 13
Rear Panel Layout........................................................................................13
Expansion ...........................................................................................13
Disk Drive...........................................................................................13
Terminal..............................................................................................14
User Labels ...............................................................................14
PC Interface and Control...........................................................14
Auxiliary .............................................................................................14
Printer.................................................................................................14
Lamp Driver........................................................................................14
Control Console..................................................................................14
Preparation........................................................................................ 15
Unpacking ....................................................................................................15
Initial Hookup ..............................................................................................15
Power Turn-on and Self Test..............................................................15
Printer Setup.................................................................................................16
Data Format .......................................................................................16

Model 4000C Instruction Manual Page vii
Printer Cable......................................................................................16
Printer Troubleshooting .....................................................................17
Terminal Interface........................................................................................17
Data Format .......................................................................................18
Terminal Cable...................................................................................18
PC Interface..................................................................................................19
PC Cable.............................................................................................19
Changing Power Settings ...................................................................20
Operation Instructions – Using the Control Head ........................ 21
Introduction..................................................................................................21
Learn Known Good.............................................................................21
Testing (Single Test)...........................................................................22
Test and Print (Error List)..................................................................22
Random Build .....................................................................................23
Sequential Build (Seq Build)...............................................................24
Search for Wire ID .............................................................................25
Reset....................................................................................................25
Main Menu Functions ...................................................................... 26
Main Menu Functions ..................................................................................26
Directory of Drive 0 ...........................................................................27
Directory of Drive 1 ...........................................................................27
Print Wire List ....................................................................................27
Loop Test ............................................................................................28
Shorts Test ..........................................................................................28
Opens Test ..........................................................................................28
Sub-Menu............................................................................................29
Self Test...............................................................................................29
Sub-Menu Functions....................................................................................30
Save to Drive 0....................................................................................30
Save to Drive 1....................................................................................30
Record Tape........................................................................................30
Format Drive 0...................................................................................31
Format Drive 1...................................................................................31
Default System Settings ......................................................................31
Operating Instructions – Keyboard................................................ 32
Entering Commands.....................................................................................32
Test Commands...................................................................................32
Build Commands.................................................................................34
Print-Related Commands....................................................................35
Disk Commands..................................................................................37
Setup Commands ................................................................................39
Chaining Programs.......................................................................................41

Model 4000C Instruction Manual Page viii
Introduction To Wire List Programming ...................................... 42
Discussion ....................................................................................................42
Wire List .............................................................................................42
User Notation List ..............................................................................42
Setup Options......................................................................................42
Sample Wire Harness...................................................................................43
Wire List without Cross References....................................................44
Wire List with User Notation..............................................................44
Program Editor................................................................................. 46
Introduction..................................................................................................46
Wire List Table - W.............................................................................46
User Notation Table - U.....................................................................47
Edit Commands............................................................................................48
Scroll Down -  ..................................................................................48
Scroll Up -  .......................................................................................48
Initialize - I .........................................................................................48
Replace - R..........................................................................................49
Add - A................................................................................................49
No User Notation - NU.......................................................................49
Delete - D #.........................................................................................49
Find Sequence - FS #..........................................................................49
Find - F (point number)......................................................................50
Find - F (From Point) (To Point) ......................................................50
Find Wire Number - FW XXX.............................................................50
Sort Tables - SO..................................................................................50
Block Programming Commands..................................................... 51
Introduction..................................................................................................51
Wire List Table.............................................................................................51
User Notation Table.....................................................................................52
Interactive User Notation Programming........................................ 53
Programming Example.................................................................... 54
Discussion ....................................................................................................54
wire harness schematic.................................................................................54
Harness Wire List.........................................................................................55
Interface Wiring ...........................................................................................56
Interface Wire List .......................................................................................57
Wire List Programming................................................................................58
Editor Start-up....................................................................................58
User Notation Table ...........................................................................58
Wire List Table ...................................................................................63
Application Notes.............................................................................. 67

Model 4000C Instruction Manual Page ix
Scanner Module Adapter Cables..................................................................67
PC Interfacing ..............................................................................................67
Summary of Keyboard Commands ................................................ 68
Test Commands............................................................................................68
Assembly Commands...................................................................................68
Print Commands...........................................................................................68
Programming Commands.............................................................................68
System Setup Commands.............................................................................68
Serial Communication Commands...............................................................69
Disk Commands...........................................................................................69
Editor Commands.........................................................................................69
Care of the Model 4000C ................................................................. 70
Maintenance.................................................................................................70
Repair...........................................................................................................70
Memory Backup Battery..............................................................................70
Replacement Parts........................................................................................71

Model 4000C Instruction Manual Page x
SPECIFICATIONS
TEST POINT CAPACITY
Main Chassis: 1 to 16 Scanner Boards, 128 points each (2048 points max.)
Expansion Chassis: 1 to 16 Scanner Boards, 128 points each (2048 points max.)
Lamp Driver: 128 drivers on one board; expandable to 254 drivers by adding a
second board. (5 vdc at 250 ma per driver)
OPERATING SPEEDS
Test: 2.5 sec. (1024 points)
7.0 sec. (2048 points)
Load from Floppy: 8.0 sec. (2048 points)
TEST PARAMETERS
Short Threshold: < 10 K
Open Threshold: > 40 K
Continuity Threshold: < 10 K
Test Current: < 3 ma
Body Current: < 5 µa
Test Voltage: < 5 vdc
INTERWIRE CAPACITANCE
.01 µf, max.
PROGRAMMABLE TEST PARAMETERS
Sample Rate: 8 to 64 s.
Start Point: 1 to 4096
Max Transmit Point: 1 to 4096
Max Receive Module: 1 to 32
CONTINUITY PROGRAMMING
Learn Known-Good
Keyboard/CRT Terminal
PC via RS-232C Port (optional software required)
DISPLAY
32-Character Alphanumeric Vacuum Fluorescent
USER-DEFINED NOTATIONS
FROM Point: 8 Alphanumeric
TO point: 8 Alphanumeric
Circuit Label: 12 Alphanumeric

Model 4000C Instruction Manual Page xi
PROGRAM STORAGE
Floppy Disk: Built-in 3.5-in. (optional)
Personal Computer: RS-232C (COM port)
POWER REQUIREMENTS
115 V~, 50/60 Hz (104 to 127 V~),
220 V~, 50/60 Hz (208 to 252 V~),
100 V~, 50/60 Hz (85 to 110 V~)
TEMPERATURE
Operating: 32 to 105 °F (0 to 40 °C)
Storage: -40 to 165 °F (-40 to 74 °C)
DIMENSIONS
Main Chassis: 10.9 in. x 14.5 in. x 17.1 in.
(27.6 cm x 36.8 cm x 43.3 cm)
Control Head: 4.5 in. x 11.1 in. x 11.1 in.
(11.4 cm x 28.1 cm x 28.1 cm)
WEIGHT
Main Chassis: 38 lbs (17.2 kg) [no scanner boards]
48 lbs (21.8 kg) [16 scanner boards]
Control Head: 10 lbs (4.5 kg)

Model 4000C Instruction Manual Page 1
GENERAL DESCRIPTION
The Cablescan Model 4000C is a microprocessor-based continuity tester. It can be used as an
assembly aid, an in-process continuity tester, and a final interconnect verification instrument for
harnesses, backplanes, and cables. Besides being self-programming, the tester provides a variety
of programming methods and floppy-disk storage of programs. An optional printer generates
hardcopy test records, and an optional Keyboard/CRT provides control in user language. The
tester may also be controlled by a Personal Computer through an RS-232C Terminal port.
Basic and optional components of the Tester are as follows:
BASIC CONFIGURATION
Major features of the Model 4000C are as follows:
Main Chassis expandable from 128 to 2048 test points
Control Head
Built-in 3.5 inch Floppy Disk
OPTIONAL COMPONENTS
Scanner Boards (128 points each)
Expansion Chassis (2176 to 4096 test points)
Lamp Driver Chassis (128 or 254 lamp drivers)
Printer
CRT/Keyboard Terminal or Personal Computer
Control and Programming Software
MAIN CHASSIS
The Main Chassis contains control circuits, memory for wire list programs, and scanner module
plug-in slots. Control circuits are microprocessor based. The test program memory is employed
for holding one complete 4096-point program at a time. Test capacity of the Main Chassis may
be from 128 to 2048 points, (128 points per each scanner board installed).
CONTROL HEAD
The Control Head contains mode selection switches, selection indicators, and alphanumeric
display. The switches, indicators, and display provide the means for operator control and
monitoring of Tester operations. The Model 4000C can be used without a Control Head for
applications using a dedicated PC for control and display.
FLOPPY DISK DRIVE
The built-in 3.5-inch floppy disk drive is located in the main chassis and is used to store test
programs when not in use. Several programs may be stored on each floppy diskette and may be
loaded using the Control Head switches. The Model 4000C may be purchased without the 3.5
inch drive for application using a dedicated Personal Computer for control and display.

Model 4000C Instruction Manual Page 2
SCANNER BOARDS
Each addition of a Scanner Board increases the test point capacity by 128 points. Additional
Scanner Boards may be installed without requiring system reprogramming.
EXPANSION CHASSIS
The Expansion Chassis is required when the systems point requirement exceeds 2048 test points.
An additional 16 scanner boards may be added in the Expansion Chassis for a total of 4096 test
points.
LAMP DRIVER (OPTIONAL)
The Lamp Driver Chassis is connected by cable to the Main Chassis. Lamp Drivers with 128 or
254 drivers are available. The lamp drivers drive 5 volt lamps installed on the interconnect
fixture to aid in locating connections or routing paths.
PRINTER (OPTIONAL)
The printer produces hardcopy record of test results, wire list programs, system setup
parameters, user notation assignments, and lamp driver assignments.
TERMINAL PORT
The Terminal Port enables an optional PC running a terminal emulation program or Cablescan
software to enable keyboard entry of wire list (in lieu of learning by scanning a known good) and
control commands (in lieu of switch selection on the Control Head).

Model 4000C Instruction Manual Page 3
FUNCTIONAL DESCRIPTION
Functional capabilities of the Model 4000C System are determined by the combination of basic
and optional components.
BASIC LEARN/TEST FUNCTION
In its basic configuration, composed of the Main Chassis and the Control Head, the Tester
memorizes point-to-point continuities by scanning a known-good circuit and storing the
continuities in its 128K dynamic memory. The Tester can then be used to scan a different
assembly and compare each scanned continuity against the corresponding learned continuities in
memory. If a mismatch is encountered, scanning stops and the FROM and TO points are
displayed, along with the nature of the error (Open or Short). With the pressing of the mode
switch on the Control Head, the test continues on past the error.
ASSEMBLY FUNCTION
When the Model 4000C is used as an assembly aid, the system employs the lamp driver to assist
the operator in the location of specified points on the assembly fixture. In the assembly modes,
body conductance is used in locating specified wires, or any random wire, and provides the
operator with the destination point for wire termination. Once the wire is terminated properly,
the Model 4000C will verify the continuity and help locate the next wire to be assembled.
PROGRAM STORAGE ON FLOPPY
When the Model 4000C is to be switched to test another assembly requiring the “learning” of a
different test program, the program in memory can be saved to a floppy diskette where it may be
preserved until needed. When the stored program is to be returned to memory for use in testing,
the new program in memory is saved to disk if it is to be preserved.
PRINTOUT
If the optional printer is added to the basic system error list and wire list printouts may be
initiated by switches on the Control Head.

Model 4000C Instruction Manual Page 4
SYSTEM OVERVIEW
MAIN CHASSIS
The Main Chassis is a cabinet containing plug-in circuit boards, fixed interconnect boards,
cabling, and a power supply. Three of the plug-in circuit boards provide Test control and
operation functions. These boards are:
CPU/RAM Board
I/O (Input/Output) Board
Scanner Control Board
These three circuit boards are interconnected by an address bus, data bus, and control/timing
bus. Sixteen Scanner Boards, with 128 test points per board, provide a scan total of 2048 test
points in the main chassis. A Scanner Interconnect board provides electrical interface with
these 16 Scanner Boards. Additional Scanner Boards can be added in the optional Expansion
Chassis to increase total test capacity to 4096 points.
CPU/RAM Board
The CPU RAM Board provides control over the Dynamic Memory, I/O and Scanner Control
Boards through Address, Data, and Control busses. Key elements on the CPU/RAM Board
are a 6809 microprocessor, 128K of Dynamic RAM Memory, 2K of Static RAM, 24K bytes
of EPROM (erasable programmable read-only-memory), decode logic, and bus drivers.
I/O Board
The I/O Board serves as a traffic control between the CPU and the mode switches, display,
Printer and terminal port. Key elements of the I/O Board are decode and control logic, a
control head interface, dual baud rate generator, two ACIAs (asynchronous communications
interface adapter) and baud rate switches.
Scanner Control Board
The Scanner Control Board provides a control interface between the CPU and the Scanner
Boards in the Main Chassis. Key elements of the Scanner Control Board are a transmit point
control, received point control, continuity detect control, automatic scan circuit, and scan rate
clock.
CONTROL HEAD
The Control Head is connected to the Main Chassis by cable. Membrane switches (touch-
sensitive) provide for initiation or termination of operating modes; above each switch is an LED
indicator, which lights when its switch is active. A 32-character alphanumeric display provides
test condition and point-to-point identification. Also included on the Control Head are a
speaker, an EARPHONE jack, a PROBE receptacle for body conductance, and a VOLUME
control.

Model 4000C Instruction Manual Page 5
OVERVIEW OF OPERATING MODES
Operation modes in the basic Model 4000C system are:
Learn Record
Test Print
Assembly Remote
Identification Menu Select
Learn Mode
Learning loads the Dynamic Memory with a wire list for use in comparison against detected
continuities of assemblies under test. With the basic system, learning can be done in two
ways:
Learn from Known Good
In this learning procedure, a “known good” assembly (wiring harness, for example) is
scanned for existing continuities, and the resultant continuity data is stored in the Dynamic
Memory. This new wire list will write over (destroying) any program residing in the
memory.
Learn from Floppy Disk
Continuity data may be loaded into the Dynamic Memory by reading a previously saved
program from disk. This new program will write over (thus destroying) any program
residing in the memory. Programs may be saved and loaded from disk using ether the
Control Head switches or commands entered from a keyboard terminal.
Test Mode
In this mode, one complete scan is performed on the circuit under test. If the scanned
configuration compares exactly with the “learned” configuration in memory, the test is
successful. If an error is encountered, the points in error are displayed, along with an
indication of whether the error is an “open” or a “short.”
Assembly Mode
During assembly, body conductance is employed to locate wires quickly and easily and
provides termination locations to the operator.
Random Build
In this mode body conductance identifies the wire touched by the operator and verifies
proper termination. If a lamp driver is part of the system and lamp driver data has been
programmed, the associated lamps can aid in providing termination and routing locations.
Sequential Build
Sequential build is used when a specific assembly sequence must be followed. The Model
4000C will display the next FROM/TO points to be assembled. When the proper
termination has been competed the display advances to the next programmed pair of

Model 4000C Instruction Manual Page 6
termination points to assembly. Body conductance can be used in selecting the proper
wire from a bundle; when the proper wire has been located, the operator is alerted.
Search Mode
The Search mode is used in identifying wires when a wire list program is not available.
Using body conductance, the operator touches the wire ends and the display indicates each
wire touched.
Remote
When the optional CRT/Terminal or PC with software is added to the system, remote mode is
used for switching system control from the Control Head to the Terminal Port.
Record Mode
When a “learned” program residing in the Dynamic Memory must be displaced by another
program, it may be stored for future use.
Record on Diskette
Continuity data for several programs may be grouped on each floppy diskette.
Record on Tape
The record and load from tape are modes retained from earlier systems and are maintained
for compatibility purposes. This enables a Control Head from an EHT-4000B to be used
on the Model 4000C to load tapes and then saved to floppy.
Print Mode
When the optional printer is added to the system, it may be used for printing wire lists and
error lists from the Control Head.
Wire List
When Print Wire List is selected the continuity program residing in memory is printed out.
The list will be composed of all FROM and TO point numbers, listed by sequence number.
The sequence number is the assembly sequence for the Sequential Build mode.
Error List
When Print Error List is selected, a test initialized and all detected errors (opens and
shorts) are printed.

Model 4000C Instruction Manual Page 7
OPTIONAL EQUIPMENT
CRT/Keyboard Terminal
With the addition of the optional CRT/Keyboard Terminal, keyboard commands may be used
in lieu of Control Head switches. The keyboard is also used to enter additional commands, as
well as to enter wire list continuities into memory. Commands and wire lists are displayed on
the CRT, which also displays test results. Wire lists and test results are displayed on the
screen in tabular form, providing the operator with an accumulation of data rather than the
one-line display that the Control Head provides. The CRT/Keyboard Terminal may also be
employed (in lieu of the control panel) for controlling the operation of the floppy disk drive
and printer.
Lamp Driver
The optional Lamp Driver drives lamps on the assembly fixture to aid in locating connectors,
components, and routing paths. The Lamp Driver can drive up to 254 separate lamp circuits.
Lamps are assigned using the CRT/Keyboard. An interface cable connects the Lamp Driver
to the Main Chassis.
Disk Controller Board
The Disk Controller Board enables the Model 4000C to be interfaced to a Floppy Disk Drive.
A controller board is included in systems with the build-in 3.5 inch floppy. The disk
controller can be interfaced to two floppy drives.
Single Disk Drive System
A single 5.25 inch floppy disk drive may be added to the Model 4000C. The 5.25 inch floppy
enables moving of programs between a 5.25 inch based personal computer to the Model
4000C. The single drive system does not include ad disk controller board since the single
drive is usually added to a system with the build-in 3.5-inch floppy drive.
Dual Disk Drive System
A dual drive system is available for systems without the build-in 3.5 inch floppy drive. The
dual drive cannot be used with the built-in 3.5 inch floppy since the controller interfaces to
only two drives.
Printer
The printer produces hardcopy records of test results, wire list programs, and system setup
parameters.

Model 4000C Instruction Manual Page 8
CONTROLS AND INDICATORS – CONTROL HEAD
All basic functions are controlled by keys on the front panel of the Control Head (Figure 2).
Nine of the main functions are selected by individual keys and the remaining functions are
menu-selected through Up and Down Keys, and executed by Menu Run key. For test situations
requiring a greater capability in commands, data input and data display, the optional PC interface
may be used. The Control Head also contains an ENABLE keyswitch, and EARPHONE jack, a
VOLUME control knob, and a body conductance PROBE jack.
KEY-SELECTED FUNCTIONS
Individual keys directly select nine functions. Three keys are used for menu selections.
Reset Remote
Test From Tape
Error List Known Good
Search Menu Run
Seq. Build Arrow Down
Random Build Arrow Up
Reset
When RESET is selected, the Tester assumes a “wait” state, and it remains in that state until
another mode is selected. RESET can also be used to terminate a mode in operation. User
labels, wire list data, and setup parameters are not affected by the RESET command. When
displaying the floppy disk directory or sub-menu, pressing RESET will return the system
back to displaying menu-selected modes.
Test
When TEST is selected, a scan on the circuit under test is initiated, and compared with the
stored configuration in memory. If it is successful (no errors), the display shows PASSED,
and a tone sounds. If an error is encountered, the points in error are displayed, along with an
indication of whether the error is an open or short. (An “O” is displayed for an open and a
“S” is displayed for a short.) When an error is found, scanning stops and waits for the TEST
switch to be pressed again to continue testing.
Error List
When ERROR LIST is selected, a test is initiated and all detected errors are printed. If no
error is located, the word PASSED is printed.
Search
Pressing this switch initiates scanning of the assembly using body conductance. When a wire
end is touched the display will readout the wire or wires being touched.

Model 4000C Instruction Manual Page 9
MENU
RUN KNOWN
GOOD FROM TAPE REMOTE
CONTINUITY TESTER
EARPHONE
PROBE
ENABLE
RANDOM
BUILD SEQ.
BUILD SEARCH ERROR
LIST TEST RESET
VOLUME
MODEL 4000C
RANDOM
BUILD - Initiates circuit assembly in random by displaying circuit information
(termination) as each wire is touched while the wrist strap is attached.
SEQ BUILD - Initiates circuit assembly in step-by-step sequence per wire list arrangement
in memory. The assembly sequence is programmed using the Wire List
Editor.
SEARCH - Initiates a scan of the test points using Body Conductance to identify wire
touched.
ERROR LIST - Initiates test and produces a printout of errors, or prints "Passed" if no
errors.
TEST - Initiates single test of assembly and displays errors.
RESET - Terminates current mode and places Tester in "wait" state until next mode
selection is made.
UP/DOWN
ARROWS
- Used for stepping up and down through menu to select one of several modes
available.
Used to step through file names when loading from disk.
MENU RUN - Initiates the menu mode (selected by Up/Down Arrows) that appears in the
display.
Used to load file from disk after the file name is displayed.
KNOWN
GOOD - Scans the connected (known-good) assembly and saves the continuities in
memory.
FROM TAPE - Reads a recorded tape into memory. (This mode is retained from earlier
systems.
REMOTE - Switches control to an optional CRT/keyboard Terminal or PC.
Figure 1. Front Panel Controls and Display

Model 4000C Instruction Manual Page 10
Seq. Build
The SEQ BUILD (Sequential Build) switch is selected when a specific assembly sequence must
be followed. In this mode, the display will sequentially show the FROM/TO points to be
connected. As the proper termination of a pair of points has been completed, the display will
advance to the next pair. Body conductance (wrist strap) is used in selecting the proper wire
from a bundle. The CRT/Keyboard is used to program the desired assembly sequence.
Random Build
The RANDOM BUILD switch is selected when the sequence of assembly is not important. In
this mode, the probe or body conductance (wrist strap) is used to identify and locate the wire
touched by the operator. When a wire is touched the display shows the wire touched and the
termination point. When the wire is properly terminated, a tone sounds, the display clears, and
the next wire may be selected.
Remote
The REMOTE switch causes control to shift from the Control Head to the operational
CRT/Keyboard. Control may be immediately transferred back to the Control Head by pressing
any other switch on the Control Head; the operation selected will be executed.
From Tape
This mode is for EHT-4000B user and is not a Model 4000C mode. This enables a Control Head
from an EHT-4000B to be used on the Model 4000C to load tapes and then save to floppy.
Known Good
With a known good harness, cable, or circuit connected to the Tester, and the ENABLE
keyswitch actuated, pressing the KNOWN GOOD switch causes a scan of all test points to find
all continuities. The continuity program is used with the test, assembly, and print modes. The
program may be saved to floppy for future use. Changes may be made to the program using the
built-in program editor and the optional CRT/Keyboard.
Menu Run
The MENU RUN key executes the menu mode that has been selected by the Up/Down arrows
and shown on the display. The MENU RUN key is also used as an advance key within menu
modes.
Up/Down Arrows
The Up and Down arrows are used to select modes from the menu. The Up arrow is used to
advance toward the top of the menu, and the Down arrow is used for advancing toward the
bottom. These arrows are also used to scroll through the disk directory when loading from the
floppy disk. Each time the Up or Down arrow is pressed, the display shows the mode name
arrived at.