Transcell Technology PC35 User manual

North American Service Manual
MODEL PC SERIES
Version 2 March 25, 1997
Revision B1.1 April 4, 2000
Prepared by
TRANSCELL TECHNOLOGY, INC.

i
TABLE OF CONTENTS
Page
Chapter 1: Introduction............................................................................................................... 1-1
Chapter 2: Legal for Trade Sealing ............................................................................................ 2-1
2.1 Overview.................................................................................................................. 2-1
2.1.1 Sealing the Scale......................................................................................... 2-1
Chapter 3: General Troubleshooting Flowchart .......................................................................... 3-1
Chapter 4: Illustrated Parts List.................................................................................................. 4-1
4.1 PC-30 & PC-70......................................................................................................... 4-1
4.2 PC-150..................................................................................................................... 4-3
Chapter 5: Assembly / Disassembly........................................................................................... 5-1
5.1 PC-30 & PC-70......................................................................................................... 5-1
5.2 PC-150..................................................................................................................... 5-2
Chapter 6: Internal Wiring Diagram............................................................................................ 6-1
Chapter 7: Theory of Operation.................................................................................................. 7-1
7.1 Theory of Operation Overview.................................................................................. 7-1
7.1.1 Main Board Assembly .................................................................................. 7-1
7.1.2 Display/Key Board Assembly........................................................................ 7-1
Appendix A: Technical Specifications........................................................................................... A-1
Appendix B: Serial Data Formats Information............................................................................... B-1
B.1 Serial Data Formats.................................................................................................. B-1
B.1.1 Serial Data Formats Overview ..................................................................... B-1
B.1.2 Consolidated Controls Demand Format........................................................ B-1
B.1.2.1 Recognized Host Commands......................................................... B-1
B.1.3 Consolidated Controls Continuous Format.................................................... B-2
B.1.4 Toledo 8213 Demand Format....................................................................... B-3
B.1.4.1 Recognized Host Commands......................................................... B-3
B.1.5 NCI 3800 / Triner Demand Format............................................................... B-4
B.1.5.1 Recognized Host Commands......................................................... B-4
B.1.6 Transcell Technology Demand Format......................................................... B-5
B.1.6.1 Recognized Host Commands......................................................... B-5
B.1.7 Transcell Technology Continuous Format..................................................... B-6
B.1.8 Detecto Demand / Continuous Format.......................................................... B-7
B.1.8.1 Recognized Host Commands......................................................... B-7

ii
B.1.9 Fairbanks 70-2453-4 Demand Format.......................................................... B-8
B.1.9.1 Recognized Host Commands......................................................... B-8
Appendix C: Circuit Diagrams....................................................................................................... C-1
LIST OF FIGURES
1-1 PC Series Front Panel........................................................................................................ 1-1
2-1 Location of Calibration Switch............................................................................................ 2-1
2-2 Detail of Calibration Switch ................................................................................................ 2-1
5-1 Opening up the PC-30 and PC-70 Base Unit...................................................................... 5-1
5-2 Opening up the PC-150 Base Unit...................................................................................... 5-3
6-1 PC Series Chassis Wiring Diagram.................................................................................... 6-1
B-1 Consolidated Controls “Demand” Weigh Data Record........................................................ B-1
B-2 Consolidated Controls “Continuous” Weigh Data / Status Record....................................... B-2
B-3 Toledo 8213 “Demand” Weigh Data Record....................................................................... B-3
B-4 Toledo 8213 “Demand” Status Record ............................................................................... B-3
B-5 NCI 3800 / Triner “Demand” Weigh Data Record ............................................................... B-4
B-6 NCI 3800 / Triner “Demand” Status Record........................................................................ B-4
B-7 NCI 3800 / Triner “Demand” Invalid Command Record ...................................................... B-4
B-8 Transcell Technology “Demand” Weigh Data Record......................................................... B-5
B-9 Transcell Technology “Demand” Status Record.................................................................. B-5
B-10 Transcell Technology “Continuous” Weigh Data / Status Record........................................ B-6
B-11 Detecto Weigh Data / Status Record.................................................................................. B-7
B-12 Fairbanks “Demand” Weigh Data / Status Record.............................................................. B-8

1-1
CHAPTER 1: INTRODUCTION
Service and maintenance personnel who desire more technical information than is presented
in the PC Series User’s Guide should use this manual. Any component level troubleshooting
or board replacement should be done by factory authorized personnel only.
The PC Series has three ranges of weight capacities. The PC-30 is a 30 lb (15 kg) scale, the
PC-70 is a 70 lb (30 kg) and the PC-150 is a 150 lb (70 kg) scale.
PC-70
MODEL
ZERO
kg
lb GROSS
NET TARE PRINT
Transcell Technology inc.
CLASS = 1500
max
n
III CAPACITY: 70 x 0.05 lb, 30 x 0,02 kg
Temp. Range: 0 to 40° C
ZERO
TARE
NET
GROSS
STABLE
lb
kg
FIGURE 1-1: PC Series Front Panel

2-1
CHAPTER 2: LEGAL FOR TRADE SEALING
2.1 OVERVIEW
The scale can be prepared for commercial use by sealing access to the calibration switch, to
meet the requirements for a legal-for-trade scale.
2.1.1 SEALING THE SCALE
Once calibration has been successfully completed, then the scale can be sealed as
follows:
1. Referring to Figure 2-1, locate the calibration switch on the back of the scale.
2. Replace the calibration switch cover by securing with the two drilled head
screws.
3. Thread a wire security seal through the openings in both drilled head screws.
This prevents access to the calibration switch. Refer to Figure 2-2 for more
detail.
Calibration Switch
Figure 2-1: Location of Calibration Switch
Drilled Head Screws
Figure 2-2: Detail of Calibration Switch Cover Plate with Drilled Head Screws

3-1
CHAPTER 3: GENERAL TROUBLSHOOTING FLOWCHART
START
Does
Scale Turn On
?
NO
YES
Try The Following In Order Of Appearance:
1. Replace AC Adapter.
2. Check the Display Cable.
3. Troubleshoot or Replace Main PCB.
NO
Try The Following In Order Of Appearance:
3. Replace Load Cell.
4. Replace Main PCB.
2. Check Load Cell Wiring.
Does
Scale Weigh
?YES
NO
Try The Following In Order Of Appearance:
Do the
Keys Work
?YES
1. Check Display Cable.
NO
Try The Following In Order Of Appearance:
1. Check for proper AC Adapter Voltage .Is the
Scale Stable
?YES
2. Check environment.
NO
Try The Following In Order Of Appearance:
1. Check for platform obstruction (i.e. ovld stop).Is the
Scale Linear
?YES
2. Replace load cell if zero offset count too high.
CALL
TRANSCELL
STOP
A
A
1.Try re-calibrating scale.
2. Troubleshoot or Replace Display PCB.
3. Troubleshoot or Replace Main PCB.
3. Troubleshoot or Replace Main PCB.
3. Troubleshoot or Replace Main PCB.

4-1
CHAPTER 4: ILLUSTRATED PARTS LIST
4.1 PC-30 AND PC-70
1
2
4
3
5

4-2
ITEM QTY PART NO. DESCRIPTION
1 1 380190008 Stainless Steel Platform
2 1 211040020 Load Cell – FAD-20 (PC-30)
2 1 211040045 Load Cell – FAD-45 (PC-70)
3 1 380190036 Bottom Spacer - Aluminum
4 1 380190037 Top Spacer - Aluminum
5 4 380190013 Adjustable Foot
– 1 250116237 AC Adapter – 12 VDC, 500 mA
1
ITEM QTY PART NO. DESCRIPTION
1 1 215193811 Main Board Assy
– 1 215366100 Display/Key Board Assy

4-3
4.2 PC-150
5
6
7
1
3

4-4
ITEM QTY PART NO. DESCRIPTION
1 1 380190008 Stainless Steel Platform
3 1 380360001 Top Spacer - Aluminum
5 1 211040100 Load Cell – FAD-100
6 1 380360007 Bottom Spacer - Aluminum
7 4 380190013 Adjustable Foot
– 1 250116237 AC Adapter – 12 VDC, 500 mA