Seca 374 - Replacement instructions; Removing the power supply; Electronic module replacement; Load cell replacement

Service Manual Replacement instructions
16.02.06/Reinhold 30-34-00-726
Mod. 374/375/376
Removing the power supply
Before starting any work, unplug the mains plug and remove the batteries!
ESD protection measures must be taken whenever work is performed on electronic components.
1. Opening the scale (page 2)
1.2 Open the battery compartment cover (B) and unscrew the screw (C). Then push the
electronics compartment cover (D) slightly to the right and remove it.
1.3 When replacing load cells (WZ) or the mains connection (NB) also:
turn the scale round and place it on a soft mat. Remove the 4 screws (G) and take off the frame
(H).
1.4 The adjusting feet (NF) can be unscrewed and replaced by new ones without disassembling
the scale.
2.1 Electronic module (EM) (page 2)
After slackening the 7 screws (I), you can take out the PCB. The switching mats (J) and the
viewing glass (K) are now accessible. To remove the viewing glass, carefully release the 4
catches along the circumference.
To replace the electronic module (EM), unsolder the cable connections before slackening the
screws.
2.2 Load cells (WZ) (Pages 2, 3)
When replacing a load cell (WZ), unsolder the 4 associated litz wires (L) from the electronic
module and detach the load cell from the scale by removing the 3 screws (F). It is easier to fit the
new load cell if you use the connecting cable of the old load cell to pull in the connecting cable of
the new load cell or an auxiliary cable.
2.3 Mains connection (pages 2, 3).
Unsolder the 2 associated litz wires (M) (page 3) from the electronic module (EM) and detach the
mains socket (NB) (page 2) from the frame by unscrewing the screws (P).
2.4 Bubble level (page 3)
Warning: Only remove the bubble level if it is defective, as destruction of the bubble level cannot
be avoided. A new bubble level can only be fitted by a skilled person working with great care!
Lever the bubble level (O) out. Scrape the holder free and clean it.
3. Closing the scale
3.1 Reassemble the scale in reverse order, following steps 2.3 to 1.1.
Important note !
When the electronic module, the load cell or the bubble level are replaced, the scale must be re-
adjusted.
Follow instructions no. 30-34-00-603.
3.2 Apply for official calibration of the scale.