51
Unomat/trxhb/trxhb
Mode
Trimmer
Reading
Measure at:
Defect.board
Make connections as per diagram 2, see section
User connection diagrams
In
0
Ω
zero source
0 mV*
TP1 - TP2
analogue
In
0
Ω
zero
Ω
in
0
Ω
TM1 - TM2 - TM3 0
Ω
analogue
In
390
Ω
span
Ω
in
390
Ω
TM1 - TM2 - TM3 390
Ω
analogue
End of calibration procedure
Check points
Test
Perform
Measure/display
Defect.board
OPEN LOOP (displ.)
TM4 - TM5 open
Output 0.4mA
processor
LOAD RES. TOO LOW Short TM9 - TM10 Output 2mV
processor
(disp.)
XMTR 24VDC Voltage
TM6 - TM7
25 V*
power
XMTR 24VDC Current Short TM6 -TM7
TM6 - TM7 33 mA*
power
Power supply
TP7 - TM6 +7.5 V*
power
Power supply
TP8 - TM6
-7.5 V*
power
Power supply
TP9 - TM9
+15 V*
power
Power supply
TP10 - TM9 +25 V*
power
Power supply
TP11 - TM9
+5 V*
power
Power supply
TP12 - TM9 -4.5 V*
power
Note: measured values are 10%
Miscellaneous
Mode
Problem
Trimmer
Defect
On
No display indication
power/keyboard
poor batteries
On
Display contrast
displ. angle
display
On
Display of horz.
displ./process