Ohmart Vega W-4510, Technical Reference Hardware Manual

Page: 137 / 162

Diagnostics and repair
120 W-4510 Weigh Scale Technical Reference Manual
Figure 61: PRO PAC AC voltage and power supply flow chart
Power switch to
ON
Power switch
indicator lit?
User AC
at I/O
TB5
Correct AC
Check Power
switch I/O J1 &
harness
+5V power
supply
AC voltage at
power supply
Check harness
Remove
power 5V
wires. +5V?
Replace power
supply
I5V usage
and correct
+ or - 15V
at power
supply ?
Remove
I/O J2 + or
-15V ?
Replace power
supply
End Isolate bad CPU
Power supply terminals
y TB1-1 AC/L1
y
TB1-2 AC/N
y
TB1-4 AC GND
y
TB2-1 -15V
y TB2-2 15V COMM
y TB-3 +15V
y
TB2-5V COM
y
TB2-6 +5V
Yes
Yes
Ye
s
No No
Yes
No No
Yes
No
Yes
No No
Ye
s