PD Service Manual
Contents
1. This AC Adaptor provides power for DC9 12V 500mA 8 2V The charging current will go down automatically when voltage reached C945 And RIT Protect ton 4 5V power drives analog devices OP amp amp A D converter U9 IC 7660 is a 5volts Voltage generator 5 5V power drives analog and digital circuit systems U8 LM358 is used to generate Svolts Voltage with negative feed back technology 60 If the scale is set with 4 oFF mode of power saving function or under LO BAT status then after fixed time CPU will release a high potential signal to draw Q4 off therefore Ql cuts off the scale will be shut down immediately 7 Low Power Detection The Q9 A733 1s designed to detect the power level When battery voltage is less than 5 5V Collector pole will release a high potential signal to CPU and then CPU will xnstruct LCP display to show LO BAT symbol 4 2 1 2 Input voltage 5 5V or higher Check and recharge battery if voltage less than 5 5V Check DC JACK or AC Adaptor if been defective 4 2 1 3 System voltage Vcc 5V 10 Check that the system voltage is within 5V 10 a Less than d oV che CPU not Work properly b more than 6V ghost will appear on LCD 4 2 2 Platter Stopper Checking Ihe platter device shall not touch anything around itself during operation Check that the platter is not contacted with the u2. Fi POFE TOFFP P VAR O 8 s PLCCA CC t Th x aa ry DD INDEX come 222 2 92222 Fit I 304 14047 i 2 1 4051 Pir 3 Jg F 4061 EIS 41294 4 1404 RAT Por adh Pre gt 140 RED J 0 4 Pilot 1404 c 4 ast 36 3 1401 irum C N Qu HE TLES ther Pat AL AG iig 534 a 118103 na eic P25 iar 382 11115 1701 3 C s 13 5 C Al TUUUUITUUUU 2 TI ME uo SSeS GE T NA ss x lt a Se fas Block Diagram Pod PRE exp SoA AE a E suede lh es FORT o DRIVERS POAT 2 DRIVERS o c BGeobod moa mox ac mnm mm dm am aa REGISTER ace EA 2 gt lt 4 ALEPROG INSTRUCTION EA Vee REGISTER BSI PORT LATCH mer oa mom io Rol PADGRAM STACK ADDRESS POINTER REGISTER IMCREMEHTER 1 IHTERRUFT SERIAL PORT ANO MMEA COUNTER FORT 3 LATCH OR OH n 51
3. D E mmi 100 U6 C43 IN1 10 ZD1 R12 OO we E n nao se 01 um C1 2 R18 OR DC9V R43 R17 1706S 10 3 17065 10 3 TOP OVERLAY 105 113 110 300N EN WO 17065 10 3 BOTTOM OVERLAY 24 pq m 17065 20 2 TOP LAYER 17065 20 2 BOTTOM LAYER D1 E DE ZD1 12 17065 20 2 2001 06 15 7 V Cope 7 BRI p Nea BAT 17065 20 2 TOP OVERLAY 17065 20 2 BOTTOM OVERLAY ZO 6 BILL OF MATERIAL STRUCTURE 1708S SERIES Pek wo NO Description meat on Oty Remark E1706000010 KIT 17065 10 MAINBOARD 1 AQQ RRR KK x LOAD CELL 1 GOOO1FWO200 INDICATOR HOUSING UPPER FW OFW SERIES al GOOO010FWOOO INDICATOR HOUSING UNDER OFW SERIES 1 0003 5 000 INDICATOR FIX PLATE PSP OFW SEIES U SHAPE 1 FOOO40BWO000 STEEL PILLAR COATING OBW SERIES L SHAPE 1 00040 000 STEEL PILLAR COATING OFW SERIES L SHAPE 1 PD F L XL 0004
4. 0001 ADJUSTABLE FEET E SERIES 2 INDICATOR A1600060400 RECHARGEABLE BATTERY GP4 6 6V 4Ah 1 A1208020351 BATTERY WIRE ARRAY 2 PIN 35cm SINGLE HOUSING 1 F0007NBS102 S S BATTERY CLAMP NBS SERIES 1 C1W10000000 PANEL PC 200 78 2t TRANSPARENT 1 C1PD0030000 OVERLAY PC PD SERIES 1 27 000000 DUST COVER MFW SERIES A0906000210 JACK 9690 AGQ Xxx x ADAPTOR V 9V 500mA al A0905600401 CONNECTOR ELI l604 P A0905600400 CONNECTOR PLI 164 R 1 A1204040250 WIRE ARRAY 4 PIN 25cm 1 G0005NBSO000 RUBBER WASHER 27xy 9x3mm 2 17065 10 MAINBOARD 0706000010 LADOS 1 A0208072250 que UPD7225G OD A0202093461 V oos 93046 1 U4 E em Ju LE JF Y A0203076600 55523 7660 Ll 09 A0204744520 EOS 74HC4520AP 1 U6 A0206000074 cu OPO 7CP AD Z A0206003580 Ts LM358N 1 U8 2 1089521 69652 02 0 10200028681 Ds UTN G281JV W t 0300000040 locu SOCKET 40 PIN 672 0401007330 TRANSISTOR A733 2 50279 A0401009450 TRANSISTOR 2580945 OB Raye A0401015150 TRANSISTOR ASES 2 2208 0401010610 TRANSISTOR C1061C OR D880 1 Q6 A0501004148 DIODE 1N4148 2 2 A0502000001 BRIDGE RECTIFIER W04 1A 1 A0503020033 ZENER DIODE LY QW 3V3 3C2 42 A0503020082 ZENER DIODE 1 2W 8V2 9A3 p ADT A0625050000 D ROUND 5mm RED GREEN 1 1 1 A0701106017 CAPACITOR EC 10uF 16V SS TYPE 6 20 22 24 0 26 0701108016 1000uF 16V Je OLY A0701477016 CAPA
5. SHOW 00900 COUNTS AND IHEN ZERO CHECK PLATTER MECHANISAM LOAD CELL A D UNIT OFFSET VALUE GHOST UNSTABLE PROPER READOUT CHECK POWER CHECK PLATTER SUPPLY LCD LCD MECHANISAM LOAD DRIVER CELL A D UNIT IC R34 37 BAD SOLDERING CAN T REACH THE INCORRECT CAPACITY CORRECT READOUT RE CALIBRATE CHECK PLATTER THE SCALE MECHANISAM LOA SO RISE OFFSET VALUF NORMAL OPERATION 16 4 2 PARTS AND COMPONENTS TROUBLE SHOOTING 4 2 1 Power Supply Checking 4 2 1 1 Relevant parts Main Board 17065 10 Qo 121061 201 8 2V W04 1A On ALSLS 4 C945 OS 60945 R14 1 2 ohm 29 12733 7660 U8 LM358 ADA Sov DC JACK 5 0 021 1 2W J1 CON 2P PW DC 9V 2 BRI wo4 1A 2BAT INVERTER 601 3 gt YN GND R29 U8A 33DK LM358 BKLT gt V C41 8 104Z 25 UBC u LM358 1 6 5 5 R26 4 7K lt ZERO 1N4148 lt AUTO OFF n C20 10uF Description 1 AC Adaptor 2 Battery Built in Rechargeable Battery 6V 4Ah 3 How Battery is charged completely The charging voltage is regulated by Q6 lor about 7 VOLTS 1061 09 A733 R40 gt LOBAT M500K and 2401
6. TO I Was 5V 40 RD P23 SS 47K 9 10uF C29 104Z 5V C36 5V gt P15 INTO INT1 CRYSTAL ZERO AUTO OFF LOBAT BKLT BZ1 0B0 15210 45V T5V SEG 08 15 e C32 V 104Z 5V 5V R34 R35 R36 10K 10K 10K l C39 l C38 1047 1042 1047 Tw C37 luF R37 18K 5V C31 104Z Title 3 5 00 071 Drawing No Size Date 17065 10 Sheet Aai V 0 E S 1 al 5 10 141 e LCD1 LCD BT347 15 2 2 V SEG 00 D9 SEG15 1706S MAIN Revision 1 of 2 89 10 06 Drawn by 2 3 5 8 7 8 20 J1 CON 2P PW 1 DC 9V 2 BKLT UBC LM358 R38 4 7 L C1 LOAD CELL 2 E NA 2 1 3 3 S 5 1 3 AA J R2 EMIDS306 MIDOK 5V V VRI M20K vy R25 4 7K L C2 1047 1047 SPAM R24 10K Q3 BRI Care 04 C1061 R12 100R C18 1047 AC
7. 5281 4 UE DESIGN 5 UURT 1867D 1 Scale 066 T APPROVAL CHECK 25 1 1997 1 5 1 3 20 1 3 15 URT BF gt 22 EN 35
8. 6V 4Ah MAIN BOARD 17065 10 ON ZERO MODE OFF 2 3 GENERAL SPECIFICATION Overall View Overall Dimension PD B 330 X 620 X 750 mm PD F 425 X 720 X 850 mm PD L 500 X 780 X 850 mm PD XL 600 X 970 X 850 mm 2 3 1 Model Specifications ED B 30 BD E TS BD B ISO __ _ Model Number y JPD F 75 PD F 150 PD F 300 _________ AA PD L 600 06 Pp 1 600 y PD XL 300 PD XL 600 0 01kg Operation E 5 ENV ONSEN Non condensed 85 Power Source Built in Rechargeable Battery or AC DC Power Adaptor DC9V 500mA 2 3 2 Main Components Used Microprocessors 989052 Oscillator Teo 029MBHZ Display Device WIN Liquid Crystal Display Load Cell Used 3500 load cell hosd Cell Capacity 60kg PD B 75 PD F 75 LOOKS 50 50 PD XL 150 250kg EDESSUDDLIEDL 3005PD XI 300 500kg ED I 600 bBD XL 7000 750kg 2 3 3 Analog Specification Input sensitivity 2mvzv zero Drafts 0 02 02710 Zero Balance Range 25 of rate capacity Load Cell Excitation Voltage DV5V A D Conversion Speed 5 times second Internal Resolution 30000 3 INITIAL SETUP 3 1 INTERNAL FUNCTIONS AND SETTING METHODS INTERNAL FUNCTION TABLE Symbol L E Ru display segment and max s ON power Orr Setting HOW TO ENTER THE REQUIRED FUNCTION MODE SS Cale OLE Press and hold TARE th
9. 5 at 50kgVR1 Trimmer 686 10 14 10 15 at 100kg 20 30 at 200kg VR1 Trimmer 82K 10 14 10 15 at 200kg 20 30 at 400kg VR1 Trimmer 68K _ READING OFFSET VALUE d Turn Scale ofr 2 Remove all Load from platter Enter F 3 and read the offset value READING SPAN VALUE Turn Scale QUE Remove all Load trom platter Enter F 1 Press ON ZERO Apply load to platter Span value according to load applied will be displayed U A 2 BO HOW TO ADJUST OFFSET VALUE In case the offset value is out of range adjust the trimmer located at VR1 on the main board to obtain correct offset value HOW TO ADJUST SPAN VALUE Ihe span value is controlled by resistor located on R1A standard resistor value of is listed on the above table If the required span value is not attained then change RIA resistor according to either case below Span value too low Increase the resistance of R1A Span value too high Decrease the resistance of RIA 10 5 FLOW CHART 5 1 Auto Calibration for end user START DISPLAY YES PRESS MODE amp ON ZERO DISPLAY LOAD DISPLAY DISPLAY or DISPLAY PUT A ASSIGNED WEGHT ON PLATTER CORRECT WEIGHT YES ASSIGNED CALIBRA TE YES NO DISPLAY T DONE Ww LCD DISPLAY PANORAMA FULL SCENE RELEASE ON ZERO KEY DISPLAY CAL CALIBRATE RELEASE MODE KEY MODE YES PRESS MODE OR ON ZERO ON ZERO
10. static or multiplexed LCD containing up to 4 backplanes and up to 32 segments and is easily cascaded for larger LCD applicalions The uPD7225 communicates with a host microprocessor through 8 bit serial interface 1 includes a 7 segment numeric and t4 segment alpha numeric segment decoder to reduce system software requirements The uPD7225 is manufactured with a low power consumption CMOS process allowing use of a single power supply between 2 7 V and 5 5 V IE is availa ble in a space saving 52 pin plastic flat package Features t Single chip LCD controller with direct LCD drive Low cost serial interface to most microprocessors Compatible with f segmeni numeric configurations up 0 16 digits 14 segment alphanumeric LCD configurations up to B characters Selectable LCD drive configuration Static biplexed triplexed or quadruplexed Je segment drivers Cascadable for larger LCD applications Selectable LCD bias voltage contiguration Static Hardware logic blocks reduce system soltware requirements serial interface Two 32 x 4 bit static RAMs for display data and blinking data storage Programmable segment decoding capability 16 7 segment numeric decoder 64 character 14 segment USASCII alphanumeric decoder Programmable segment blinking capability Automatic synchronization of segment drivers with sequentially multip
11. 1000uF ZD1 8 2V EL1 8036 5V Ate R23 T BAT D2 4 R14 1N4148 pee 1 2R V Q7 A733 R15 R39 lt 15K M150K 2 ANN NO USE R13 i 7 2208 D3 1N4002 2 e y R40 M500K R43 LEDI us d GREEN V EH Q5 A1515 5V AN Y a SW1 R21 i 22K ON ZERO R19 o 4 7 04 zro om A A 105 612 105 1 0945 R9 K 1N4148 2 2 ewe lt AUTO OFF 20 10uF 014 C13 MUS d 0 22uF MPP R7 M100K C10 0 22uF MEF R4 R5 3 RB M100K M100K 2 M100K 69 0 22uF MEF R10 M20K R41 22K AAA qs LOBAT C16 1047 R42 4 7K 5V 611 105 oo Q9 622 C6 104Z pe U7 7135 V UNDERRANGE 29 REF OVERRANGE REF INT R H AZ BUF OUT REF CAP CLK INTO INTI BUSY gt i S NPUT LSD D1 D2 V D3 15 45005 04 12 58 81 58 88 1 82 B4 C5 1042 Title 17065 Drawing No 17065 10 Size Date C27 1047 amp A D Revision 45V C26 1047 C25 1047 J3 CON 6P WF 6 5V 5V CRYSTAL __ C43 20P UBA 74HC4520 U6B 7 3728 32 sheet 2 89 10 06 Drawn by __ __ 5 e 7 os 74 4520 250
12. 15 1 PaO 3 66 AT89C52 29 intersil Data Sheet 417 Digit BCD Output A D Converter The Intersil 7135 precision A D con verter with its multiplexed BCD output and digit drivers combines dual slope conversion reliability with 1in 20 000 count accuracy and is ideally suited for the visual display DVM DPM market The 2 0000V full scale capability auto z ero and auto polarity are combined with true ratiometric operation almost ideal differential linearity and true differential input All necessary active devices are contained on a single CMOS IC with the exception of display drivers reference and a clock The ICL7135 brings together an unprecedentedcombination of high accuracy versatility and true economy It features auto zero to less than 10 V zero drift of less than 1 V OC input bias current of 10pA Max and rollover error of less than one count The versatility of multiplexed BCD outputs is increased by the addition of several pins which allow it to operate in more sophisticated systems These include STROBE OVERRANGE UNDERRANGE R UN HOLD and BUSY lines making it possible to interface the circuit to a microprocessor or UART Pinout ICL7135 December 2000 File Number 3093 2 Features Accuracy Guaranteed to 1 Count Over Entire 20000 Counts 2 0000V Full Scale Guaranteed Zero Reading for OV Input 1pA Typical In
13. 4KHz of 2 ZA 93 _ 25C1061T2 D R2 3 1 2R C2 220uF 16V 1N4148 PW DC102 PW DC343 BAT1 17065 RECHARGE BOARD Revision DRAWING NO 1 17065 20 SCALE SHEET 1 OF 1 DATE 90 03 27 24 5 2 PCB LAYOUT ih b O NY 00000000090 ce bd NOP ES b 4 o Y i w My e 0 _ ER peo 1 ER C Fr ra hd ra 2 FA 9 UA pl gt fj 6 1 17065 10 3 BOTTOM LAYER E U9 23 ium R15 AM LED1 R16 R13 Ds I 40 R23 C 45 50 AA NG C E C AM R21 01 10 5 R33 NR1 AM R30 CED C34 C35 R32 AM 37 c AM AW AW AW AM C41 U8 C33 CN1 BZ1 R37 R36 R35 R34 R29 t succum 89 10
14. ARBON RESISTOR CARBON EIE 100K OHM 1 4W 15K OHM 1 4W 18K OHM 1 4W 220 OHM 1 4W 22K OHM 1 4W 330K OHM 1 4W 470 OHM 1 4W 4 7K OHM 1 4W EL BACKLIGHT OPTION A0401009450 A0805041102 0805041334 1400000004 1401005000 2 PIN WAFER PITCH 3 9mm CRYSTAL Fos ioe MAZ DIP S W DS UZ 4 BEN TACT SW 11048 BUZZER 10 HEAT SINK MB 204 20 SCREW FLAT HEAD NUT M3 IRANSISTOR 206945 CARBON FILM RESISTOR CARBON FILM RESISTOR BACKLIGHT EL INVERTER 1K OHM 1 4W 330K OHM 1 4W 103 5 40mm BL 8036 5V 90cm ad ONN 65 gt JIPENDDERRP WARE 02304 3924990942 VERI NR1 RIO R9 R26 R29 R40 R3 R8 R14 EZ E2255 RUT 2420 34 530 R20 RLS R37 R33 R16 SEMI EE I p Og dg dy x1 D IP SW1 4 06 06 06 PA 7 APPENDIX st M A T 89 C 52 Features Compatible with MCS 51 Products 8 Kbytes of In System Reprogrammable Flash Memory Endurance 1 000 Write Erase Cycles Fully Static Operation 0 Hz to 24 MHz Three Level Program Memory Lock 256 x 8 Bit Internat RAM 32 Programmable UO Lines Three 16 Bit Timer Counters 8 j t Eight Interrupt Sources Programmable Serial Channel i Low Power and Power Down Modes Microcontroller with 8 Kbytes Descr
15. CITOR EC 470uF 16V C A0702105035 CAPACITOR 1ugp 35V 1051 1 C37 A0702106016 CAPACITOR TC 10uF 16V 106F zo X EST A07 13105063 POLYESTER FILM CAPACITOR MEF 1luF 63V 105 gt 10115512 0713224101 POLYESTER FILM CAPACITOR MEF 0 22uF 100V 224 2 9 10 A0710224101 POLYESTER FILM CAPACITOR MPP 0 22uF 100V 224 J 0720103101 POLYESTER FILM CAPACITOR PEI 0 011 100 1037 1 2 6 0730104050 0740020050 0801001203 0802047309 0803042002 0803042201 0804041003 0804041503 0804045003 0804046802 5005000110 0805020120 0805021101 0805041102 0805041103 0805041104 0805041153 0805041183 0805041221 0805041223 0805041334 0805041471 0805041472 0902010020 1100273728 1301000002 1306000003 1500000004 5004000002 20011000308 20016000003 CAPACITOR MLC 1042 CERAMIC CAPACITOR IRIMMER 3006P 001 203 20K RESISTOR NETWORK 47K OHM 9 PIN METAL FILM RESISTOR 10PPM 20K OHM 1 4W METAL FILM RESISTOR 10PPM 2 2K OHM 1 4W METAL FILM RESISTOR 100K OHM 1 4W METAL FILM RESISTOR 150K OHM 1 4W METAL FILM RESISTOR 500K OHM 1 4W METAL FILM RESISTOR 68K OHM 1 4W JUMPER CARBON FILE RESISTOR CARBON FILE RESISTOR CARBON FILM RESISTOR CARBON FILM RESISTOR ODE 1 2 OHM 1 2W 100 OHM 1 2W 1K OHM 1 4W 10K OHM 1 4W CARBON FILM RESISTOR CARBON FILE RESISTOR CARBON FILE RESISTOR CARBON FILE RESISTOR CARBON ELLE RESISTOR CARBON FILM RESISTOR C
16. KEY NO DISPLAY no DISPLAY 99999 DISPLAY 99999 COUNT DOW DISPLAY 00000 COUNT DOWN DISPLAY 00000 DISPLAY 0 kg WEIGHT IS STILL ON THE PLATTER DISPLAY NON NO STANDBY FOR OPERATION XXXX ASSIG INED WEIGHT TL 3 5 2 Function Test for technicians only PRESS TARE amp ON ZERO LCD PANOR AMIC VIEW RELEASE ON ZERO KEY RELEASE TARE KEY MODE oo Other S i TARE STANDBY FOR F2 OPERA TION m 99999 COUNT DOWN DISPLAY xxxx Show offset PRESS ZERO 7 TEST KEYBOARD A D gt 0 3 counts k key code Key in Private Code lt PRESS KEY CODE 1 2 0152 NOTE 1 TARE key 2 ON ZERO key LEGITIMATE PROCEDURE END Accept Private Code DISPLAY SPAN VALUE PUT ON THE ASSIGNED WEIGHT DIP SW 1 T gt ON PRESS MODE WEIGHT ASSIGNED Lo MODE TARE MODE Y MODE Press MODE for lasting 2 sec WEIGHT UNIT CHANGED XX XX kg Ib lt gt XX XX kg 14 TARE Auto shut off when in use for 4 min L3 4 TROUBLE SHOOTING 4 1 TROUBLE SHOOTING LOOP POWER ON DISPLAY RANDOM FIGURE NO DISPLAY CHECK POWER SUPPLY CHECK CPU ECD TCD KEY BOARD LCD DRIVER T
17. MAINTENANCE MANUAL PD BENCH FLOOR SCALE SERIES MODELS PD B 30 PD B 75 PD B 150 PD F 75 PD F 150 PD F 300 PD L 150 PD L 300 PD L 600 PD XL 150 PD XL 300 PD XL 600 CONTENTS 1 INTRODUCTION 2 SPECIFICATIONS 2529 SYSTEM BLOCK DIAGRAM PHYSICAL LAYOUT OF ELECTRICAL CONNECTION GENERAL SPECIFICATIONS 3 INITIAL SETUP px WWW CO CO BW INTERNAL FUNCTION AND SETTING METHODS AUTO AND DEALER CALIBRATION PROCEDURES DISABLE CALIBRATION WITH DIP SW S1 OFFSET AND SPAN VALUE DATA FLOW CHART 4 TROUBLE SHOOTING 4 1 4 2 TROUBLE SHOOTING LOOP PARTS AND COMPONENTS TROUBLE SHOOTING 5 ELECTRICAL CIRCUITRY sub SCHEMATICS dez PCB LAYOUT 6 BILL OF MATERIAL 7 APPENDIX MARCH 2004 Specifications and Function Subject to Change without Notice l INTRODUCTION This maintenance manual contains of certain information that may result in fraudulent use Do not release any part of this manual to any end users or un authorized persons The internal DIP S W shouldbe set to prevent un authorized settings or alternations Should a load cell has been replaced make sure that the protection devices are properly set After servicing is necessary to through all tests and procedures to ensure the scale meets all the meteorological and approval requirements Here are some features of the PD series Zero indicator indicator Negative value indicator subt
18. URES ACCEPTABLE LOAD FOR AUTO AND DEALER CALIBRATION odel Number External Acceptable Auto Dealer Calibration Division Load 1 6000 10kg 20 1 7500 20kg 50kg 1 7500 50kg 100kg 1 6000 100kg 200kg PD 600 1 6000 200kg 400kg Recommended calibration load Dealer Calibration Procedures Turn OL Press and hold IARE then turn scale oni Scale displays 1 Press MODE Scale displays offset value Press ON ZERO Press TARE Press ON ZERO Press O Press ON ZERO scale displays an arrow at the right hand of the display It means the scale is ready for dealer calibration Make sure that the figure being displayed is 0 or 1 If not press ON ZERO again 11 Load calibration either load as listed on above table 12 When value displayed is stable press MODE 13 Wait until the scale starts down count 14 Calibration completed and scale is ready for operation e XO OO Of d Note odd weight calibration can be executed during step 11 Min calibration weight 10 of rated capacity Ll Press MODE for lasting L second scale displays 00090 Enter calibration weight by pressing ZERO key to increase value IARE key to move cursor Press MODE after calibration weight is keyed in Place calibration weight onto the scale When value displayed is stable press MODE Wait until scale displays DONE and starts down count The scale is now calibrated and ready
19. en turn scale on Scale displays F 1 Press TARE until the required function number appears Press MODE Press MODE until the required setting appears Press TARE to confirm Repeat step c to f for other function setting or Press ON ZERO to save settings and return to normal operation rO O O O F 1 Span Value Reading and Dealer Calibration Simply enter Fel to read the A D Counts b PressON ZEROtocleartheA Dcounts applytestmassontoplatter the span value of test mass will be displayed c Refer to Dealer Calibration procedures for dealer calibration F 2Display Segment and Rated Capacity amp Division Check When function is entered all segments will be displayed Check and make sure that no segments are missed F 3Check Offset Value and Scale Configuration a Enter F 3 scale displays the Offset value when unloaded b Apply extra load onto platter the total internal count value will be displayed SELECT WEIGHT UNITS a Press and hold MODE until the weight unit appears b To employ all metric and pound weight units press MODE until lb appears To disable pound weight unit press MODE until kg appears C Press ON ZERO to save setting and back to normal operation status F 4Auto Power Off Settinq Two modes are available Default 4 OFF 0 OFF Auto Power Off function is disabled 4 OFF Scale will automatically be turned off after 4 minutes unused 3 2 AUTO AND DEALER CALIBRATION PROCED
20. for normal operation NO Auto Calibration Procedures Dum Scale EE Press hold MODE then turn scale On Scale displays CAL Press MODE Scale displays LOAD XXXX or XXXX Apply calibration load according to above table Wait until the scale displays DONE and starts down count Calibration completed and scale is ready for operation 07 5 O9 NO Note odd weight calibration can be executed during step 5 Min calibration weight 10 of rated capacity 1 Press MODE for lasting 1 second scale displays 00000 Enter calibration weight by pressing ZERO key to increase value TARE key Lo move cursor Press MODE after calibration weight is keyed in Scale displays LOAd XXXX XXXX cCcalibratrion weight Place calibration weight as shown on the display Wait until scale displays DONE starts down count The scale is now calibrated and ready for normal operation NO OY OB 9 3 3 DISABLE CALIBRATION AND AVOIRDUPOIS WEIGHT UNITS WITH DIP SW DIP1 The DIP SW 1 control calibration avoirdupois weight units Push this EGON to disable 3 4 OFFSET AND SPAN VALUE DATA OFFSET AND SPAN VALUE DATA TABLE Model Offset Span Value Thousand at Offset Span Number Value Various Load Applied ControlccOhrm Thousand 10 14 10 15 at 10 20 30 at 20kg 10 14 10 15 at 20kg 25 37
21. iption Flash The ATSIC 52 15 low power high performance CMOS Bbk microcomputer with 8 Kbytes af Flash programmable and erasable read only memory PEROM The device ts manudac 5 high density memory technology and is compatible with the industry standard S051 and BOCS instruction sec amd pinout on chip Flash allows the program he reprogranimmed or by conventional nonvolaute memory programmer combining a versatile 8 bit with Flash on monolithic chip the Atmel 4189052 s a powerful microcomputer which provides highly flexible and cost effective to many embedded control apphicauons AT89C52 provides the following standard features 8 Kbytes of Flash 236 bytes of RAM 32 lines three 16 rimcr c unters stk vector two level interrupt arehuteciure full duplex serial port on chip oscilla and clock curcuury addition the p y conninued Pin Configurations 104 Poo 41007 Flac J 1 Prac B gt ADT Siac P 36401 5 faba Pig 404 19 4 041 AST O 7 18701 _ TEL PI Aa ErPROG px 622 gt unti ea 12114154 LOT WA PE 4 AUS Ady 211 JPET airy
22. lexed backplane rivers I Single power suppty variable from 2 7 V to 5 5 V Low power consumption CMOS technology Extended 40 85 lemperalure range available y OOM Ordering information Frequency Part Number of Operation uPD7225G 00 Package 2 pin plastic 1 MHz Pin Configuration i 5 E 5 EI all E Pin Identification Ho Symbai Funcion f System clock output 2 SYNC Synchronc ation 3 5 Vicor LCD bias voltage supply inpurs LCD Ground 33 Power 8 SCK Serial clock inpul 8 SI Serial 55 Chip select fi BUSY Busy 12 670 Command of data seteci input 13 RESET 14 NC No connection 15 18 COMp COM y LCD backpiane driver outputs 19 32 34 51 5951 LCD segment driver outpuls 52 Syslem clock input 32 DATE 0370771987 Sunny PU TUER 2270 _ _ 7f 22 I E as 4 I I 11106 E FU QE BH NOWNWOS 81 A12 5 AAPITCH 13 5x3 405 12 6 4 7 o if Ei m PIE 2 QU x ra a ENS Cu ape 23 9 4 4 PITCH 13 5X4 54 18 NO 571 PITCH 1354 5 DD NOT SCALE THIS DR REVISED ii Rev BY 03 07 1087 SUNNY
23. pper no load and or lower with load stopper 4 2 3 LCD Display Checking 4 2 3 1 Check that it is soldered and connected properly between LCD and driver O0PDIZ250 5 driver OUEDIZZD and CPU 4 2 3 2 Check whether LCD is broken 4 2 4 CPU Checking 4 2 4 1 Check that all pins are seated properly into the socket 4 2 4 2 Check that the Crystal Oscillator works 18 4 2 4 3 Check the RESET 58 Low 4 2 5 A D Unit Checking 4 2 5 1 Check that the 45V amp powers are correctly eo to A D Unit 4 2 5 2 Check that the signal output or Loadcell adequate 4 2 5 3 Check OP amplifiers amp A D converter AD7135 When no error is found with the above checking procedures the trouble can be caused by the load cell or the PCB itself Replace a new one could be better to identify the defectiveness In this way the readout of weight would be varied because of the output voltage of loadcellanddifferent span value sore calibration 1s necessary after this replacement 1 9 ELECTRICAL CIRCUITRY 5 SCHEMATICS C35 2op 7 3728 2 5V C34 EA 18 10K TO RS 232C CON 4P WF 5V SW4 TARE TARE _ gt MODE gt o SW3 MODE READY TARE MODE BUSY CAL ZERO 02 89 51 XTAL1 VDD VSS P17 P16 P15 P14 P13 P12 P10 POS P27 P26 P07 P25 P24 R 22 20 DJP1 SW DIP
24. put Leakage Current True Differential Input True Polarity at Zero Count for Precise Null Detection Single Reference Voltage Required Overrange and Underrange Signals Available for Auto Range Capability All Outputs TTL Compatible Blinking Outputs Gives Visual Indication of Oerrange Six Auxiliary Inputs Outputs are for Interfacing to UARTs Microprocessors or Other Circuitry Multiplexed BCD Outputs Ordering Information TEMP PKG PART NUMBER RANGE C PACKAGE NO ICL7135CPI 0to 70 28 Ld PDIP E28 6 TOP VIEW B2 28 UNDERRANGE OVERRANGE 1 CAUTION These devices are sensitiv e to electrostatic discharge bllow proper IC Handling Procedures 1 888 INTERSIL or 321 724 7143 Intersil and Design is a trademark of Intersil Corporation Copyright Olntersil Cor poration 2000 30 ICL7135 Typical Application Schematic SET V REF 1 000V Vngr IN po 45V 6 CLOCK IN EN 28 7 120kHz ANALES 100k 2 GND 5 26 4 25 0 47 m ay 100k E DRIVER mul TRANSISTORS 1 7135 22 6 100K 8 21 SIGNAL A E INPUT 01 lt s E 11 12 13 14 2 intersil spi uPD7225 CMOS Intelligent Alphanumeric LCD Controller Driver Description The 7225 is an intelligent peripheral device signed to interface most microprocessors with a wide variety of alphanumeric LCDs It can directly drive any
25. ractive tare function Power on zero function Manual zero function Auto Power Saving Function Multi Weight Unit Selectable 5 x 21mm wide angle LCD digits 0 Dual power By built in rechargeable battery and external AC DC power adaptor 11 Low battery warning signal 12 Dual Color Charge Status Indicator 139 2 Types of Calibration 14 Overload protection devices against excessive load or shock applieq 15 AC DC power adaptor and dust cover included 16 Dip Switch to prevent end user calibration 17 Optional EL backlight and Rechargeable Power Pack e OO Oy Or uy IX 2 SPECIFICATION 2 1 SYSTEM BLOCK DIAGRAM LED DRIVER POWER SUPPLY KEYBOARD 1 AC ADAPTOR 4 KEYS 9V 500mA 2 RECHARGEABLE BATTERY 6V 4Ah Description When an article is placed on the platter the load of the article 1s applied to the load cell inside the scale Ihe resistance to the excitation current in the strain gauge will then changed and the analog output signal varies ie amplified and digitized continuously by the A D converter into a digital signal Subsequently the resulting count is processed and managed by the CPU The CPU refers to the instructions from the keyboard andthen conveys the output data to LCD driver which formats the data into readout on the display panels 2 2 PHYSICAL LAYOUT OF ELECTRICAL CONNECTION DC JACK e LOAD CELL CONNECOTR RECHARGEABLE BATTERY
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