Seca 727 Series Service Manual
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Also See for 727 Series:
- Instruction manual (293 pages) ,
- Instruction manual and guarantee (40 pages) ,
- Manual (37 pages)
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Variants:
7271321004
7271321124
7271321334
7271321614
7271321624
7271321804
7271321844
7281321009
7281321129
7281321619
7281321834
Content:
Function diagram
Electronics
Block diagram electronics
Description of RS232 interface
Description of faults
Replacement
Calibration
spare parts
Manual number:
17-05-01-260-i
Service Manual
for seca 727, 728
Description:
High resolution baby scales with integrated LED-display
Service Manual Number
17-05-01-260-i
Valid as of:
25-01-02-481 a
25-01-02-467 e
08-09-01-267 c
30-34-00-605 a
30-34-00-437 g
30-34-00-483 e
30-34-00-654
30-34-00-486 k
01.12.2010
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Summary of Contents for Seca 727 Series
- Page 1 Service Manual Variants: for seca 727, 728 7271321004 7271321124 7271321334 7271321614 Service Manual Number 7271321624 7271321804 17-05-01-260-i 7271321844 Valid as of: 01.12.2010 7281321009 7281321129 7281321619 7281321834 Description: High resolution baby scales with integrated LED-display Content: Function diagram 25-01-02-481 a Electronics...
- Page 3 In order to ensure a higher signal yield for the For temperature compensation of the strain gauge seca 717, the measuring element and the A/D sensor, a fixed-value resistor is connected in converter are supplied with 10V; usually, a 5V parallel with a temperature-dependent resistor.
- Page 4 If the bottom or upper limit of the A/D converter is overshot, "EEEEE" is displayed. Zero point determination After starting, "SECA" is displayed for approx. 1 Range switch-over for model 717 second. During this period, the zero point is By pressing the weighing range switch-over determined.
- Page 5 5V voltage. setting. For the seca 717, the 10V in-phase regulator 451 Power supply is used which supplies the A/D converter and the The circuit has the following special features: force measuring element using buffer capacitors 452, 453.
- Page 6 Circuit description Model 717,727,728,737,748,757 Blatt 4(3) Diode 102 is used as polarity reversal protection and overvoltage protection. Diodes 110 and 111 protect against discharge during battery operation and against polarity reversal. Electrolytic and tantalum capacitors are distributed evenly over the printed circuit board as backup capacitors for the operating voltage.
- Page 10 Seca 717/727/728/737/748/757 Description of faults short positive pulse must be registered. If there Troubleshooting is no pulse, check the start button and diodes First and foremost make a visual inspection, 115 and 118, otherwise replace IC 126. checking the soldering points and for corrosion Measure the voltage at pin 1 of IC 131.
- Page 11 On seca 748, the voltage at capacitor 120 must be approx. 9 V, on seca 727 and seca 757 it must be approx. 7.2 V. If the voltage is different, recharge or replace the rechargeable battery.
- Page 12 Check the slope and adjust if necessary, see manual adjustment instructions: seca 727: No. 30-34-00-448 seca 737/757: No. 30-34-00-484 seca 748: No. 30-34-00-446 9. Fault description: Scale displays "EEEE" after starting Check fuse 450 or soldering jumper 450 and replace if necessary.
- Page 13 Description of faults Model 748 Check the force sensor connection: Check the cables between the main board and Check the soldered connections (for seca 748 the supplementary board: see drawing 08-06-04-541). - Check the soldered connections - Measure the signals 5V, GND, REF, TEST on...
- Page 14 1.1 to 4.1. 5.2 Adjust and check the scale in accordance with the instructions for manual calibration or adjustment. seca 727/728: 30-34-00-484, 30-34-00-336 seca 717/737/757: 30-34-00-484,30-34-00-4 5.3 Calibrate the scale. (Only applies for model 717/737/757) 08.01.98-Ha. Blatt 1 (2)
- Page 16 Service manual Adjustment instruction Procedure to adjust the scale model 727 and 728: 1) Place the scale on a smooth ground. Pay attention that the scale is adapted to the environment temperature prior to the adjustment. 2) Connect the scale with the supply unit to the power supply.
- Page 17 Service Manual Spare parts list seca 727/728 Item Articel-No. Designation Price stage 02-01-01-254-509 Frame, black 02-01-01-258-509 Frame black RS234 interface 01-13-05-001-009 Foot 08-06-14-239-009 Battery compartment 08-06-16-058-119 Cable harness for rechargeable battery connection 08-04-05-317-009 Screening plate 08-06-16-116-119 Harness for plug in power connection.
- Page 18 Service Manual Spare parts list Item Articel-No. Designation Price stage 68-22-12-721-009 Set of rechargeable batteries 08-06-16-082-119 Cable harness 08-06-16-083-119 Cable harness RS232 interface 01-18-01-255-009 Push button with print, ON 01-18-01-253-009 Push button with print, Hold/Tara 01-18-01-252-009 Push button with print, kg/lbs 08-06-12-071-009 Load cell Equipment...