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North American Service Manual

1. Start Transmission Polarity lt SP gt Positive Negative B 1 8 1 M Motion Space Space Space Checksum Byte 1 Weight digits Weight digits Status Byte Checksum Byte 2 End C Over SE Transmission with leading zero suppression FIGURE B 11 Detecto Weigh Data Status Record RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters This command is sent to the scale to print the indicated display The host should check the status bytes to determine if the scale is in motion positive overload or negative overload lt SO gt This command is sent to the scale to change the scale to Continuous type Even if successful the host receives no response from the scale lt Sl gt This command is sent to the scale to change the scale to Demand type Even if successful the host receives no response from the scale NOTE You can execute the lt SO gt and lt SI gt host commands by hitting Ctrl N for lt SO gt and Ctrl O for on your computer s keyboard Page B 7 8 1 FAIRBANKS 70 2453 4 DEMAND FORMAT Figure B 12 shows the weigh data status record sent to the host when the scale receives a Print lt CR gt command The same weigh data record is sent out of the serial port if the PRINT key is pressed on the scale s front panel XXXX XXX lt SP gt
2. Z GRN BLK WHT Main ADC Board Assy Setup Switch Ferrite Bead Core Female DSUB9 Display Key Board Assy PC 150 only GRN 1 E 2 S BI E BLK RED J1 JP2 2 ee 1 J2 J3 Ken 12345678 910 1234 RED ON 9 oy e O e Ferrite Bead Core DC Power Jack Ss A d 1 2 D lq e LED On Off Switch 5 GND 2 SCALE RXD 3 SCALE TXD 10 9 8 1 TO REMOTE 5 DISPLAY KEY 4 UNIT PC 30 amp 3 PC 70 ONLY i Female 14 PIN CENTRONICS Figure 6 1 PC Series Chassis Wiring Diagram 6 1 CHAPTER 7 THEORY OF OPERATION 7 1 THEORY OF OPERATION OVERVIEW Refer to Appendix C for reference designators 7 1 1 MAIN ADC BOARD ASSEMBLY Power to the scale is supplied by a 12 VDC 500 mA adapter Regulator U1 supplies 5 VDC to the digital components Regulator U8 supplies 10 VDC to the analog components including load cell excitation Switching regulator V5 inverts the 10 VDC to 10 VDC to act as the negative supply rail Regulators V4 and V6 further regulate to 8 VDC for the A D converter IC U9 Op amp U11 form
3. This command is sent to the scale to zero the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or within the zero reset range Whether the command was successful or not the scale sends a status record to the host Page B 3 A This command is sent to the scale to request an acknowledgement This acknowledgement consists of two characters lt STX gt and lt CR gt B 1 5 NCI 3800 TRINER DEMAND FORMAT Figure B 5 shows the weigh data record sent to the host when the scale receives a Print W lt CR gt command The same weigh data record is sent out of the serial port if the PRINT key is pressed on the scale s front panel The status record is shown in Figure B 6 If an invalid host command is received the scale responds with the invalid command record shown in Figure B 7 See section below for more information High Status Byte Table Bit Function Units 3 Carriage End of LB pound Return Transmission 83 Not Used i B2 Not Used KG kilogram Weight Data 81 Not at zero 2 BO Motion Bae sia a Low Se Table 1 Insert lt SP gt for Triner 1 True 2 Insert lt SP gt for NCI Low Status Byte i Function 3 Use lower case for NCI See Table 4 Insert lt LF gt for NCI Not Used Not Used Over capacity Under capacity FIGURE B 5 NCI 3800 Triner Demand
4. lt UNITS gt lt SP gt lt GR NT gt lt SP gt lt CR gt lt EOT gt Space Space Space Carriage End Weight digits Return Transmission Units Two Status Bytes _ _ lb pounds GR gross stable Space Carriage kg kilograms gr gross unstable Return NT net stable nt net unstable with leading zero suppression FIGURE B 12 Fairbanks Demand Weigh Data Status Record B 1 9 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters lt CR gt This command is sent to the scale to print the indicated display The 7 EC G N scale will not respond if the scale is in positive overload The host should check the status bytes to determine if the scale is in motion This command is sent to the scale to zero the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or within the zero reset range Even if successful the host receives no response from the scale The host must issue a lt CR gt command to determine if the command was processed by the scale This command is sent to the scale to tare the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale wil
5. Figure B 3 shows the weigh data record sent to the host when the scale receives a Print W command The same weigh data record is sent out of the serial port if the PRINT key is pressed on the scale s front panel If the weigh data is invalid the scale responds with a status record instead as shown in Figure B 4 See section below for more information NOTE Since this SDF Serial Data Format does not support units of measure It is recommended that lb kg conversion be disabled Start Carriage Transmission Return Weight Data FIGURE B 3 Toledo 8213 Demand Weigh Data Record STATUS BYTE TABLE Function Start Carriage Transmission Return Parity bit Always 1 Always 1 Center of zero Outside zero capture range Under zero Out of range Motion Invalid Weight Status Byte 1 True See Table FIGURE B 4 Toledo 8213 Demand Status Record B 1 4 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters W This command is sent to the scale to print the indicated display The scale will respond with the status record if the weight is less than zero or the scale is in motion positive overload or negative overload Otherwise the scale responds with the weigh data record H Same as the W command except that the scale outputs an extra character at the beginning and end of the weigh data record Z
6. eessnsusssneensnsnnssssssnsnnns sss sss ssssne B 4 B 1 5 1 Recognized Host Commande B 4 8 1 6 Transcell Technology Demand Fomat sss sseeeesseensnstnsssnenssssnsssssssssnes B 5 B 1 6 1 Recognized Host Commands B 5 8 1 7 Transcell Technology Continuous Fomat eeeeeeeeeeeeeeseeeeerreeeesrrrrrrressens B 6 B 1 8 Detecto Demand Continuous Fommat sess sseeeessnensntsnssnnnnssssnsssssssssnes B 7 B 1 8 1 Recognized Host Commands ssn ssssns B 7 B 1 9 Fairbanks 70 2453 4 Demand 6 B 8 B 1 9 1 Recognized Host Commande B 8 Appendix C Circuit DiagrAMS eee amana ae C 1 LIST OF FIGURES 1 1 PC Series Front Panel 1 1 2 1 Location of Calibration Switch nenea nana nana 2 1 2 2 Detail of Calibration Switch nenea aaa nana 2 1 5 1 Opening up the PC 30 and PC 70 Base Un 5 1 5 2 Opening up the PC 150 Base Un 5 3 6 1 PC Series Chassis Wiring Diagramm 6 1 8 1 Consolidated Controls Demand Weigh Data 0 00 B 1 B 2 Consolidated Controls Continuous Weigh Data Status 000 B 2 B 3 Toledo 8213 Demand Weigh Data Record sss B 3 B 4 Toledo 8213 Demand Status Record snnnusseeennnnnnsnssnnnnnnn sss B 3 B 5 NCI 3800 Triner Demand Weigh Data Record B 4 B 6
7. receives no response from the scale The host must issue a P command to determine if the command was processed by the scale N This command is sent to the scale to revert to net The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or a tare has yet to be established Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale C This command is sent to the scale to toggle among the configured units Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale B 1 3 CONSOLIDATED CONTROLS CONTINUOUS FORMAT Figure B 2 shows the weigh data status record automatically transmitted by the scale at the end of each display update The same host commands listed in Section B 1 2 1 are accepted and acted upon by the scale ans ane Gross Net z Start Weight Data G Gross Carriage Transmission N Net Return Polarity lt SP gt Positive Negative Units L pound K kilogram Status lt SP gt Valid M Motion O Over under range FIGURE B 2 Consolidated Controls Continuous Weigh Data Status Record Page B 2 B 1 4 TOLEDO 8213 DEMAND FORMAT
8. EEPROM 64 x 16 external to uC SERIAL COMMUNICATIONS RS 232 Full Duplex Selectable Baud Data Bits and Parity OPERATOR INTERFACE Display 6 Digit 0 56 7 segment LED Display Keyboard 5 key Tactile Keypad POWER AC Adapter 12 VDC 500mA ENVIRONMENTAL Operating Temperature 41 F 0 C to 95 F 40 C Storage Temperature 4 F 20 C to 167 F 75 C Operating RH 20 to 95 non condensing Storage RH 20 to 98 PHYSICAL DIMENSIONS 13 0 in 330 2 mm _ II 13 0 in 330 2 mm e o F 4 4 in 112 mm Ea e WER E S E ON OFF DC POWER RS 232 REMOTE SWITCH JACK PORT DISPLAY CONNECTOR 2 CALIBRATION ID TAG WP 30 amp 70 ONLY PC 150 Onl SWITCH COVER 10 2 in 258 0 mm PC 30 70 A 1 APPENDIX B SERIAL DATA FORMATS INFORMATION B 1 SERIAL DATA FORMATS B 1 1 SERIAL DATA FORMATS OVERVIEW The COM1 serial port is a full duplex RS 232 port designed for connection to a serial printer computer or remote display Consult the PC Series Operation Manual for information on pinouts and cable diagrams Through the User Menu you may choose one of the available SDF s Serial Data Formats These serial data formats emulate certain makes of scales and make up the Application Layer From a Data Link Layer perspective there are two types Demand and Continuous Some SDF s can be used with both types but most ca
9. NCI 3800 Triner Demand Status eco B 4 B 7 NCI 3800 Triner Demand Invalid Command Record B 4 8 8 Transcell Technology Demand Weigh Data 0 B 5 8 9 Transcell Technology Demand Status Hecor nenea ssn sss B 5 B 10 Transcell Technology Continuous Weigh Data Status 6 00 B 6 B 11 Detecto Weigh Data Status Record nenea anna B 7 B 12 Fairbanks Demand Weigh Data Status Record nenea nana B 8 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 be done by factory authorized personnel only or board replacement should The PC Series has three ranges of weight capacities The PC 30 is a 30 Ib 15 kg scale the PC 70 is a 70 lb 30 kg and the PC 150 is a 150 lb 70 kg scale GROSS NET TARE ZERO Ea Cc Ouuu STABLE CAPACITY 70 x 0 05 Ib 30 x 0 02 kg CLASS III Temp Range 0 to 40 C N max 1500 Ib kg NE ZERO ak TARE PRINT MODEL Transcell Technology inc FIGURE 1 1 PC Series Front Panel 1 1 CHAPTER 2 LEGAL FOR TRADE SEALING 2 1 OVERVIEW The scale can be prepared for commercial use by se
10. North American Service Manual MODEL PC SERIES Revision 81 1 April 4 2000 Prepared by TRANSCELL TECHNOLOGY INC Chapter 1 Chapter 2 2 1 Chapter 3 Chapter 4 4 1 4 2 Chapter 5 5 1 5 Chapter 6 Chapter 7 7 1 Appendix A Appendix B B 1 TABLE OF CONTENTS Page 110011100 1 1 Legal torTradE SealinG is scar carcass 2 1 OVON Wirt 2 SS EE 2 1 ne Bn 2 1 General Troubleshooting Flowchart eseseeesnsnnnassssssnnnens nnn sss 3 1 illustiated Paris EE 4 1 le EEN 4 1 aa aaa Gury eased 4 3 Assembly Disassembly sss Sassen 5 1 ER RGO RTE 5 1 le EE 5 2 internal Winnog Diagrama e eo at a a a a a aa n datat 6 1 Theory Of Operations ne atena aaa a ee a a tere a ase dadu 7 1 Theory of Operation Overvlew nana nana anna 7 1 TAY Main Board un EE 7 1 7 1 2 Display Key Board Assembly nana 7 1 Technical SPECITICATIONS ET A 1 Serial Data Formats Information nenea nnn B 1 EENS RO EE 8 1 8 1 1 Serial Data Formats Overview nenea nana aaa B 1 B 1 2 Consolidated Controls Demand Fomat xe eeeeeveensnstsssnensssnnsssssssssnes B 1 B 1 2 1 Recognized Host Commands nana B 1 B 1 3 Consolidated Controls Continuous 0 B 2 B 1 4 Toledo 8213 Demand Fommat nenea nana nana B 3 B 1 4 1 Recognized Host Commande B 3 B 1 5 NCI 3800 Triner Demand FOrMat
11. Weigh Data Record airs sf asses sss cere Carriage End of Return Transmission Carriage Return High Status Byte Low Status Byte Same as W See as W FIGURE B 6 NCI 3800 Triner Demand Status FIGURE B 7 NCI 3800 Triner Demand Record Invalid Command Record B 1 5 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and consist of two ASCII characters W lt CR gt This command is sent to the scale to print the indicated display The host should check the status bytes to determine if the scale is in motion positive overload or negative overload Page B 4 Z lt CR gt This command is sent to the scale to zero the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or within the zero reset range Even if successful the host receives no response from the scale The host must issue an S lt CR gt command to determine if the command was processed by the scale S lt CR gt This command is sent to the scale to request the status record B 1 6 TRANSCELL TECHNOLOGY DEMAND FORMAT Figure B 8 shows the weigh data record sent to the host when the scale receives a Print P command The same weigh data record is sent out of the serial port if the PRINT key is pressed on the scale s front panel If the weigh data is
12. ale is in motion positive overload or negative overload The scale will also disregard this command if it displaying a negative gross value Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale G This command is sent to the scale to revert to gross mode The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in net mode Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale N This command is sent to the scale to revert to net The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or a tare has yet to be established Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale C This command is sent to the scale to toggle among the configured units Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale 8 1 7 TRANSCELL TECHNOLOGY CONTINUOUS FORMAT Figure B 10 shows the weigh data status
13. aling 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 O O a o O S EH o e e Calibration Switch Figure 2 1 Location of Calibration Switch Drilled Head Screws d Figure 2 2 Detail of Calibration Switch Cover Plate with Drilled Head Screws 2 1 CHAPTER 3 GENERAL TROUBLSHOOTING FLOWCHART Try The Following In Order Of Appearance Try The Following In Order Of Appearance 1 Check for proper AC Adapter Voltage 2 Check environment 3 Troubleshoot or Replace Main PCB 1 Replace AC Adapter 2 Check the Display Cable 3 Troubleshoot or Replace Main PCB Try The Following In Order Of Appearance Try The Following In Order Of Appearance Is the 1 Check for platform obstruction i e ovid stop Scale Linear 2 Replace load cell if zero offset count too high 3 Troubleshoot or Replace Main PCB Does 1 Try re calibrating scale Sca
14. invalid the scale sends the status record shown in Figure B 9 See section below for more information Start Weight digits Space Carriage End Transmission Return Transmission Polarity Units Gross Net Line Positive lb pound ST ES Feed Negative kg kilogram NT Net with leading zero suppression FIGURE B 8 Transcell Technology Demand Weigh Data Record Question End Mark Transmission Status Character 2 Start See Continuous Mode Transmission Status Character 1 See Continuous Mode FIGURE B 9 Transcell Technology Demand Status Record B 1 6 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters P This command is sent to the scale to print the indicated display The scale will respond with the status record instead if the scale is in motion positive overload or negative overload Page B 5 Z This command is sent to the scale to zero the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or within the zero reset range Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale T This command is sent to the scale to tare the scale The scale will disregard this command if the sc
15. l also disregard this command if it displaying a negative gross value Even if successful the host receives no response from the scale The host must issue a lt CR gt command to determine if the command was processed by the scale This command is sent to the scale to revert to gross mode The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in net mode Even if successful the host receives no response from the scale The host must issue a lt CR gt command to determine if the command was processed by the scale This command is sent to the scale to revert to net The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or a tare has yet to be established Even if successful the host receives no response from the scale The host must issue a lt CR gt command to determine if the command was processed by the scale Page B 8 C This command is sent to the scale to toggle among the configured units Even if successful the host receives no response from the scale The host must issue a lt CR gt command to determine if the command was processed by the scale Page B 9 APPENDIX C CIRCUIT DIAGRAMS Please see attached schematic diagram sheets C 1
16. le Weigh 2 Check Load Cell Wiring 3 Replace Load Cell 4 Replace Main PCB Try The Following In Order Of Appearance 1 Check Display Cable 2 Troubleshoot or Replace Display PCB 3 Troubleshoot or Replace Main PCB 3 1 CHAPTER 4 ILLUSTRATED PARTS LIST PC 30 AND PC 70 4 1 De a D 4 1 ITEM QTY PARTNO 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 z 1 250116237 AC Adapter 12 VDC 500 mA i i p2 T z o H gt ITEM QTY PART NO DESCRIPTION 1 1 215193811 Main Board Assy 1 215366100 Display Key Board Assy 4 2 PC 150 4 2 pu mm e E N Gen 0 0 94 4 3 ITEM QTY PARTNO 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 Adjus
17. n be used with only one type For Demand types the scale acts as the client and requires a host usually a PC The host issues a command typically a single ASCII character and the scale responds with a weigh data record a status record or no record depending on the specific SDF chosen NOTE Use Demand types for interfacing to a serial printer In this case data output can be initiated by pressing the PRINT key on the front panel of the scale Host is not required For Continuous types host control is not required but not restricted either In this type the scale automatically transmits a weigh data status record out of the serial port at the end of each display update Continuous types are used to interface to computers scoreboards and other remote devices requiring constant data updating Host commands although not required are accepted and acted upon CONSOLIDATED CONTROLS DEMAND FORMAT Figure B 1 shows the weigh data record sent to the host when the scale receives a Print P command The same weigh data record is sent out of the serial port if the PRINT key is pressed on the scale s front panel If the weigh data is invalid the scale does not respond See section below for more information E ZI Start Weight Data Space Carriage Transmission Return Units Gross Net lb pound GR Gross kg kilogram NT Net Polarity lt SP gt Positive Negative FIGURE B 1 Con
18. record automatically transmitted by the scale at the end of each display update The same host commands listed in Section B 1 6 1 are accepted and acted upon by the scale Weight Data Gross Net End G Gross Transmission N Net Polarity Status Character 2 Positive 0 valid Negative Units 1 Motion LB pounds 2 Zero KG kilograms 3 Motion and Zero 4 Not Ready Start Transmission Status Character 1 0 valid 1 Under 2 Over FIGURE B 10 Transcell Technology Continuous Weigh Data Status Record Page B 6 B 1 8 DETECTO DEMAND CONTINUOUS FORMAT The Detecto SDF Serial Data Format can work both as a Demand type and a Continuous type depending on the commands received from the host Upon power up the scale defaults to Demand type The scale disregards the type setting programmed for Mode of Serial Transmission Figure B 11 shows the weigh data status record sent to the host when the scale receives a Print command The same weigh data record is sent out of the serial port if the PRINT key is pressed on the scale s front panel The output records are identical when operating as a Demand type or a Continuous type NOTE Since this SDF Serial Data Format does not support units of measure It is recomm ended that lb kg conversion be disabled lt STX gt lt SP gt lt SP gt 2 lt SP gt lt CHK1 gt lt CHK2 gt
19. s a high impedance bridge amplifier for the load cell with a fixed gain of 100 Op amp U10 B forms a low pass filter to prevent unwanted noise from entering the circuit The other half of U10 U10 A provides a buffered reference voltage for op amp U11 The A D converter U1 is a dual slope type converter Timing is controlled by the microcontroller Microcontroller U2 executes several functions including A D fetch digital signal conditioning key scan serial communication and display output EEPROM U5 contains calibration data as well as the setup parameters IC U7 is the EPROM which contains program memory The network around U4 boosts the MCU s UART signal to RS 232 level for serial communication with a host device DISPLAY KEY BOARD ASSEMBLY This circuit contains footprints for 5 keys display driver U4 and the LED Display U1 U3 7 1 APPENDIX A TECHNICAL SPECIFICATIONS ANALOG SPECIFICATIONS Full Scale Input Signal 16 mV including dead load Internal Resolution Approximately 150 000 counts Displayed Resolution Up to 3 500 graduations max Measurement Rate 10 Meas sec nominal System Linearity Within 0 02 of FS Calibration Method Software Calibration with long term storage in EEPROM Excitation Voltage 10 VDC RFI Protection Signal lines protected by LC Low Pass Filters Excitation amp Power lines protected by EMI Chokes DIGITAL SPECIFICATIONS Microcontroller Intel 80C32 Program Memory 32K x 8 external to uC
20. solidated Controls Demand Weigh Data Record 8 1 2 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters P This command is sent to the scale to print the indicated display The scale will not respond if the scale is in motion positive overload or negative overload Page B 1 Z This command is sent to the scale to zero the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or within the zero reset range Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale T This command is sent to the scale to tare the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it displaying a negative gross value Even if successful the host receives no response from the scale The host must issue a P command to determine if the command was processed by the scale G This command is sent to the scale to revert to gross mode The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in net mode Even if successful the host
21. table Foot 1 250116237 AC Adapter 12 VDC 500 mA 4 4 CHAPTER 5 ASSEMBLY DISASSEMBLY 5 1 PC 30 and PC 70 Tools Required 5 mm Allen Wrench Phillips Head Screwdriver 1 Remove the scale platter 1 and set aside 2 Using the 5 mm Allen wrench remove the 2 load cell mounting bolts 2 3 Lift off the sub platform assembly 3 and set aside 4 Remove the 4 mounting screws 5 for the splash plate 4 and set aside 5 Lift off the splash plate and set aside sa et Je Figure 5 1 Opening up the PC 30 and PC 70 Base Unit 5 1 5 2 PC 150 Tools Required 5 mm Allen Wrench Phillips Head Screwdriver 1 Remove the scale platter 1 and set aside 2 Using the 5 mm Allen wrench remove the 2 load cell mounting bolts 2 3 Lift off the sub platform assembly and aluminum spacer 3 and set aside 4 Remove the 4 mounting screws 5 for the splash plate 4 and set aside 5 Lift off the splash plate and set aside 5 2 SE J 4 Figure 5 2 Opening up the PC 150 Base Unit 5 3 CHAPTER 6 INTERNAL WIRING DIAGRAM RED Load Cell

North American Service Manual

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