18
67XXU USB/Serial Scale Service Manual
2.5 Mainboard
shows the main board connectors for the loadcell, RS-232 port, USB port,
power supply and battery.
Figure 2.23 67XXU Main Circuit Board
2.5.1 Definition of Connectors and Jumpers
Table 2.1 Loadcell Connector
Table 2.2 Adapter Power Input Connector (ADP)
Pin
Description
In/Out/Power
Electrical Level
1
+ excitation
power output
5±0.3 VDC (
≤
0.12A)
2
+ sense
power input
5±0.3 VDC
3
- excitation
power ground
0 VDC
4
- sense
power input
≤
0.5 VDC
5
+ signal
signal input
2.5±0.3 VDC
6
- signal
signal input
2.5±0.3 VDC
7
shield
-
-
Pin #
Definition
In/Out/Power
Electrical Level
1
Adapter input voltage - (GND)
Power ground
0VDC
2
Adapter input v
Power input
6.5 VDC (6-9VDC,
≥
0.5A)
