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Seca 780 Service Manual

Seca 780
22 pages
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Service
Manual
for
seca
780,
782
Variants:
7802317004
7802321004
7822321004
7822321604
Description:
Service
Manual
Number:
17-05-01-271-
b
Valid
as
of:
01.10.00
Valid
until:
Electronic
column
scale
Bearing
determined
lever
system,
double
ending
tuning
fork
Sensor,
DETF-module
with
basic
display.
Content:
Operation
17-10-06-244
e
Function
diagram
30-34-00-629
a
Electronics
30-34-00-617
Electronics
30-34-00-618
Description
of
faults
30-34-00-588
a
Replacement
30-34-00-656
a
Calibration
30-34-00-603
spare
parts
mod.
780/782
30-34-00-651
b
Manual
number:
17-05-01-271-
b

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Seca 780 Specifications

General IconGeneral
Graduation100 g
DisplayLCD
Capacity300 kg
FunctionsWeighing, BMI calculation
Power supplyBatteries / Mains adapter optional
Data transmissionRS232

Summary

Functional description

Introduction

Overview of the DETF basic scale and its primary purpose in adult weight determination.

Weighing

Detailed explanation of how weight is transferred and measured via the load lever system.

Overload protection device

Description of the mechanism designed to protect the scale from excessive load.

Platform locking device

Explanation of the device that secures the platform and helps reduce hysteresis.

Vibration-sensitive switch (optional)

Details on the optional switch that activates the electronics when a load is applied.

Function diagram

DETF basic scale

Schematic illustrating the functional blocks and operational flow of the DETF basic scale.

Brief description of the DETF module

Introduction

Introduction to the DETF module family and its role in electronic weight measurement.

Weight measurement

How the tuning-fork sensor and microcontroller measure and calculate weight.

Temperature measurement

How temperature affects sensor readings and is compensated for accuracy.

Power supply

Description of the power sources for the DETF module.

EEPROM

Serial bus

Fault handling

Time base

Recalibration

Technical data

Brief description of the display module

Introduction

Introduction to the display module's role in showing weight and interacting with scale controls.

Display

Details on the LCD display, its update rate, and explanation of special characters.

Power supply

Information about the power supply for the display module, sourced from the SeSAM bus.

Operation

Description of basic operations and user-accessible functions like Hold, Tare.

SeSAM bus

Identification code

Backlighting (optional)

Signal transmitter (optional)

Fault handling

Time base

Recalibration

Optional functions

Tare

How the tare function is assigned and operated, including toggling.

Hold and Autohold

Explanation of the Hold function and its automated 'Autohold' variant for freezing weight.

Replace weight in repeat measurements

Configuration option to redisplay the last weight in repeated measurements.

Menu functions

Description of various menu functions like BMI, IDE, UL, and DIFF.

Technical data

Specifications for the display module, including supply voltage, current, and dimensions.

Description of faults

Scales cannot be started

Troubleshooting steps for issues preventing the scale from powering on.

Scales show no weight or an incorrect weight (repeatedly)

Diagnosing and resolving problems with inaccurate or missing weight readings.

Incomplete digits

Causes and remedies for errors resulting in partial or corrupted display digits.

Malfunction during the weighing procedure

Troubleshooting specific error codes encountered during the weighing process.

Replacement instructions

Removal

Step-by-step guide for the safe removal of components from the scale.

Fitting

Step-by-step guide for the correct installation of components onto the scale.

Description of the calibration mode for scales with modular electronics

General

Overview of the software calibration device and its general requirements.

Calibration counter

Explanation of the calibration counter that tracks the number of recalibration procedures.

Recalibrating the scales

Detailed instructions on how to enter and perform scale recalibration.

Example of a recalibration procedure

Summary of a typical recalibration sequence

Spare parts list

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