GILBARCO VEEDER-ROOT M00016K003, Руководство по установке

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MDE-4133B Power Supply Kit M00016K003 Installation Manual • November 2003 Page 21
Troubleshooting the M02774 Power Supply Board
Troubleshooting the M02774 Power Supply Board
Figure 16: M02774 Connectors, LEDs, and Test Points
24 VDC Problem
If one or more 24 VDC devices in the dispenser fails to operate, examine CR18 ( Figure 16 ) on
M02774 and perform the action in the following If/Then table.
Note: Examples of 24 VDC devices are the CRIND printer, the monochrome display backlight,
and the LED board for the bar code scanner.
If ... Then ...
CR18 is lit if you still have problems, trace out the connections from the M02774 board to the
affected device.
• If bad connection found, fix problem.
• If still no problem found, verify the voltages with respect to ground (TP2) at test
points TP1 and TP3 ( Figure 16 ).
Note: The 24 VDC power connection is made on any of P3502A, P3502B, P3503A,
and/or P3503B (
Figure 16 ).
CR18 is not lit either the M02774 board is bad or the transformer (part of the M02274 power supply
assembly) feeding the 24 VDC section of the M02774 board is bad.
Measure AC voltage across pins 3 and 4 on connector P606 (
Figure 16 ). The voltage
should be in the 30 VAC to 40 VAC range.
• If not in that range, suspect the transformer.
• If in that range, suspect the M02774 board.
Transformer
Connectors:
P607
P606
Notes:
1. P606: pins 1 and 2 are for 8 VAC;
pins 3 and 4 are for 34.5 VAC.
2. P607: pins 1 and 3 are for 18 VAC.
Test Points:
TP1 (+22.8 - +25.2 V)
TP2 (GND)
TP3 (+17.5 - +28 V)
P606 Pins:
3
4
Green LEDs:
CR17
CR18
24 VDC
Connectors:
P3502B
P3503B
P3502A
P3503A
Pump/CRIND
Control Node
Connector:
P1402