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4-5

CHAPTER 4 REPAIR PROCEDURES

7. Unsolder the Load Cell wiring from the Main PC Board. Note the position and color coding of the

wires on the main PC Board. These will have to be soldered on the new PC Board in the same
positions.

8. On the replacement Main PC Board, install the Battery and Switch connectors.

9. Refer to Figure 3-2 and solder the Load Cell wiring to the replacement Main PC Board. Make sure

that the color coded wiring is installed in the correct locations.

10. Connect the Display Cable to the Main PC Board connector. See Figure 4-8.

CAUTION: THE DISPLAY CABLE CONNECTOR MUST BE CORRECTLY INSTALLED WITH THE TAB FACING UP.

6. Remove the Battery connector plug from the Main PC Board and the connector that connects

to the On/Off Switch. See Figure 4-7.

4.3.1 Main PC Board Replacement (Cont.)

Figure 4-7. Disconnecting Battery and On/Off Switch Connectors from Main PC Board.

ON/OFF SWITCH CONNECTOR

BATTERY CONNECTOR

LOAD CELL WIRING

DISPLAY CABLE

DISPLAY CABLE CONNECTOR

CONNECTOR TAB

Figure 4-8. Installing Display Cable to Main PC Board.

MAIN PC BOARD

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Содержание EC Series

Страница 1: ...Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 973 377 9000 EC SERIES SCALES SERVICE MANUAL...

Страница 2: ......

Страница 3: ...ration assumes no liability arising from the use or misuse of this material Reproductionofthismaterialisstrictlyprohibited Material in this manual is subject to change Copyright 2005 Ohaus Corporation...

Страница 4: ......

Страница 5: ...g and Calibration 3 1 3 1 Testing the AC Adapter 3 1 3 2 Testing the Membrane Switch 3 1 3 3 Testing the Load Cell Assembly 3 2 3 3 1 Resistance Test 3 2 3 3 2 Excitation and Output Voltage Test 3 2 3...

Страница 6: ...Assembly with frame 4 9 4 5 Replacing the Load Cell Component 4 11 4 5 1 Overload Protection Stop Adjustment 4 12 4 6 Replacing the Battery 4 13 CHAPTER 5 PARTS LISTS 5 Parts Lists 5 1 5 1 EC Series...

Страница 7: ...ration Chapter 4 Repair Procedures Contains detailed repair procedures for all major components Chapter 5 Parts Lists Contains overall views identifying all major serviceable replacement components wi...

Страница 8: ...st the EC Series Scales must meet the requirements of ASTM Class 4 or OIML Class F2 The mass values are listed in Table 1 1 TABLE 1 1 CALIBRATION MASSES MODEL Calibration Cal in kg MassesTotaling EC3...

Страница 9: ...l types of problems that could be encountered with the scale The troubleshooting tables refer to an interconnection diagram in Section 3 to assist in locating the problem 2 1 SCALE WILL NOT TURN ON WI...

Страница 10: ...d lead and0ohmsfortheblacklead Ifanopen conditionexists replacewiringandcon nector as necessary If OK proceed Refer to Section 3 2 and test the Mem brane Switch Replace if necessary See Repair Procedu...

Страница 11: ...r proceedwithPerformanceTestsinSec tion 3 6 TABLE 2 4 NO DISPLAY OR PARTIAL DISPLAY SYMPTOM Displayisnotonorpartialchar acters are displayed PROBABLE CAUSE Display PC Board is defec tive or LCD may be...

Страница 12: ...uld be tested in accordancewithSection3 4 TheMain PC Board if defective should be re placed See Repair Procedures 4 3 After repair proceed with performance Tests in Section 3 6 SYMPTOM Scale can be tu...

Страница 13: ...tly Ensure the Pan is empty before switching the scale on Test the Load Cell refer to Section 3 3 If defective replace see Section 4 4 After repair proceedwithPerformanceTestsin Section 3 6 The Main P...

Страница 14: ...2 6 CHAPTER 2 DIAGNOSIS...

Страница 15: ...the voltage on the battery terminals Turn the scale on The voltage should be 6 5 Volts dc minimum and 7 5 Volts dc maximum If the voltage is below or above these readings replace the Adapter This is t...

Страница 16: ...DING Wires 2 5 415 15 Ohms Wires 3 4 350 3 Ohms NOTE Wires 2 3 4 and 5 must be isolated from chassis ground and shield Resistance should be greater than 5 megohms A lower reading indicates a short in...

Страница 17: ...e 3 3 indicates typical readings actual values can vary but should remain linear throughout the entire range If readings are out of tolerance replace the Load cell See Section 4 4 or 4 5 for Load Cell...

Страница 18: ...ure 3 2 Interconnection Diagram which illustrates the interconnections to the Main PC Board and is shown as a top view 7 Turn the scale on 8 Using a DVM measure the excitation voltage across EXE and E...

Страница 19: ...ng test leads in place of the load cell Make sure connections are correct 6 Connect a known good AC Adapter to the scale and connect to a power source 7 Turn on the scale an error may be displayed Thi...

Страница 20: ...DoNOTdisposeofthebatteryinincinerators orcrushortrytoopen Disposeofthe defective battery in accordance with local regulations for lead acid type batteries CAUTION Checkthebatteryforanysignofirregular...

Страница 21: ...voltage should be above 6 0 Volts dc ten minutes after charging stops NOTE If the scale operates less than 80 hours charge the battery and turn on the scale and test how long the scale operates If the...

Страница 22: ...d Units ____________ Zero Return ____________ Mass Used ____________ Accurate performance of the EC Series Scales is determined by a series of three performance tests Repeatability Test Off Center Loa...

Страница 23: ...ng Mean Sum of Readings 10 Delta Reading Mean Standard Deviation The Square root of the sum of the Delta x Delta 9 5 Add the ten readings and divide the total by 10 to find the Mean average Mean Readi...

Страница 24: ...o return the reading to zero 5 Slide the mass halfway between the center and the left edge of the platform and record the reading 6 Slide the mass to the center of the weighing surface and press the Z...

Страница 25: ...s to the center of the platform and record the exact value displayed 6 Remove the reference mass and verify that the display returns to zero If it does not disregard the reading press ZERO to rezero t...

Страница 26: ...l scale capacity ________________ Reading 3 reference weight added at 1 2 full scale capacity ________________ Reading 4 reference weight added at 3 4 full scale capacity ________________ CalculateDif...

Страница 27: ...mulation Battery status Memories 10 locations for APW Keyboard 7 function 11 numeric x Membrane switch Tare Sample APW Zero Pre set Tare M Cancel Zero Range 4 of Full Scale Capacity Tare Range Full Ca...

Страница 28: ...CAL is displayed in the Count window 2 The required calibration weight is displayed ex 3000g for a 3kg model At this time a different calibration weight value can be entered via the numeric keypad 3 P...

Страница 29: ...l d scale division d scale division t rAtE 0 1 2 3 4 5 Level bL 0 Auto On 1 Manual Unit 0 Grams g 1 Pounds lb AU 0 Off 1 On Auto Off Sets the period of inactivity before the scale automatically turns...

Страница 30: ...3 16 CHAPTER 3 SCALE TESTING AND CALIBRATION...

Страница 31: ...the AC adapter Make sure the scale is off 2 Carefully lift and remove the Pan and Pan Support from the scale 3 Turn the scale over and remove the five screws which hold the Top Housing Refer to Figur...

Страница 32: ...tions 1 Refer to Section 4 1 and remove Top Housing CAUTION Use care in the next step as the Display PCB wiring is attached to the PC board 2 Place the scale in the upright position and carefully lift...

Страница 33: ...hrough the hole in the Top Housing Peel off the protective film from the new Membrane Switch and carefully align and affix to the Top Housing 8 Press the Membrane Switch down uniformly Using your fing...

Страница 34: ...uitry and the Battery if the wiring is accidentally shorted during servicing Figure 4 5 Battery Terminal Connector Note the positioning of the cable for reassembly 3 Remove the screws and washers hold...

Страница 35: ...ing is installed in the correct locations 10 Connect the Display Cable to the Main PC Board connector See Figure 4 8 CAUTION THE DISPLAY CABLE CONNECTOR MUST BE CORRECTLY INSTALLED WITH THE TAB FACING...

Страница 36: ...efer to Figure 4 9 and move the Main PC Board Jumper from normal to service position NORMAL SERVICE Figure 4 9 Main PC Board Jumper Positions 14 Position the Top Housing in place over the scale tempor...

Страница 37: ...Switch Cable from the Display PC Board 3 Disconnect the Membrane Switch Cable from the Display PC Board See Figure 4 11 Figure 4 10 Disconnecting the Ribbon Cable 4 Remove the six screws that hold th...

Страница 38: ...ledamagesuchasacrackedglassorpartial display and the scale operates normally in all other functions NOTE This procedure is very difficult and should not be attempted unless you have the proper tools 1...

Страница 39: ...be checked before installation 1 Refer to Section 4 1 and remove Top Housing 2 Turn the scale over and remove the four feet by unscrewing them counter clockwise The feet are actually screwed into the...

Страница 40: ...position in the slots on the Bottom Housing and secure with the screws and washers previously removed 12 Refer to Figure 4 15 and move the Main PC Board Jumper from normal to service position 4 4 REPL...

Страница 41: ...tery wires together with the Load Cell cable 3 Remove the Load Cell by unscrewing two bolts on the top of the Load Cell and two bolts on the bottom of the Load Cell See Figure 4 16 Figure 4 16 Load Ce...

Страница 42: ...sert the proper feeler gauge as specified in Table 4 2 2 With the correct feeler gauge positioned in the first Overload Protection Stop press down on the Frame and see if there is movement of the fram...

Страница 43: ...used when it is required to change the Battery WARNING DEATH OR SERIOUS INJURY CAN OCCUR Charge the battery only with the charger in the scale Charging the battery under any other conditions may caus...

Страница 44: ...e Top Housing is installed the Battery is held in place CAUTION Dispose of the Battery according to local regulations for hazardous materials Do not incinerate crush or throw out in regular garbage co...

Страница 45: ...t is made The scale MUST meet the parameters of all applicable specifications in this manual If further technical information is needed in the United States call toll free 1 800 526 0659 between 8 00...

Страница 46: ...MBLED TOP HOUSING OPEN MEMBRANE SWITCH P N 80120005 P N 80010589 ECJP DISPLAY PCB P N 80104178 Scales older than SN 8026532998 require a new Main PCB FEET P N 80120032 1 Pc BOTTOM HOUSING P N 80120024...

Страница 47: ...N 8026532998 require a new Display PCB BOTTOM HOUSING OPEN Figure 5 2 Components in Bottom Housing of EC Series Scales BATTERY P N 80120026 DISPLAY CABLE P N 80120022 LOAD CELL TOP FRAME P N 80120039...

Страница 48: ...Loadcell EC15 80120016 Loadcell EC30 80120017 Loadcell assembly EC3 80120018 Loadcell assembly EC6 80120019 Loadcell assembly EC15 80120020 Loadcell assembly EC30 80120021 Power switch assembly 801200...

Страница 49: ...ervice Menu Diagram A 1 ENTERING THE SERVICE MENU 1 Turn the scale on Note The password must be entered during the scale self test in the next step 2 The Service menu is accessed by entering the passw...

Страница 50: ...ions 1 2 or 5 as selected 1 The center display shows d d divisions 2 The left display shows choices of 1 2 or 5 3 Press Sample to change or Tare to accept and advance to next menu See Figure A 4 Figur...

Страница 51: ...ON See Table A 1 1 The center display shows dot 2 Press Sample repeatedly to select decimal point position Refer to figure A 1 for values 3 Press Tare to accept setting and advance Figure A 6 illustra...

Страница 52: ...A 4 APPENDIX A SERVICE MODES...

Страница 53: ...ale will prompt you for the correct weights to be used based on it s capacity NOTE The following displays illustrate the weights to be used with a 3kg scale 1 Turn the scale on 2 Enter password 123456...

Страница 54: ...ow center and right windows indicate 0 See Figure B 5 Figure B 5 Final Calibration Weight Display 11 Remove all calibration weights from the scale B 1 CALIBRATION Cont 9 Add the third weight to the to...

Страница 55: ......

Страница 56: ...PN 80010584 B SERVICE MANUAL EC SERIES SCALES 80010584...

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