Ohmart Vega W-4510, Technical Reference Hardware Manual

Page: 139 / 162

Diagnostics and repair
122 W-4510 Weigh Scale Technical Reference Manual
Table 18: Power supply board test points and labels
Power Supply Test point label Description
H1 Not used
H2 Not used
TP1 Isolated ground
TP2 Loop current test point 200mV/mA loop current. Referenced to isolated
ground.
Table 19: CPU board test points and labels
CPU Test point label Description
Count Raw input signal coming from preamp.
GND Logic ground
U5 pin8 +5V power supply test points referenced to Logic ground.
Jumpers
The W-4510 Weigh Scale uses jumpers J1–J4 on the CPU board as division values for the
output frequency to the Smart Pro.
Note: Do not change the jumper from the current setting without consulting Ohmart Field
Service
Table 20: Jumper division values
J1 Divide by 20
J2 Divide by 10
J3 Divide by 5
J4 Divide by 2
None Divide by 1
If the W-4510 Weigh Scale does not have a jumper, the division value is one, and the output
frequency does not change.
LED indicators
Check the basic functioning of the Ohmart electronics at the instrument with LED indicators
on the CPU board. They are visible when you remove the explosion proof housing cap.
See the tables on page 123 for a summary of the LED indications.
FIELD
Off
On
Blinking
MEM
HA
R
T
CPU
AUX
HV
FIELD
HV
AUX
CPU
HA
R
T
MEM
Figure 63: GEN2000 LED indicators