Graco ProMix PD2K Repair Parts Manual page 42

Repair
Replacing the 24 Vdc Power Supply
NOTICE
To avoid damaging the circuit boards when
servicing the control box, wear Part No. 112190
grounding strap on your wrist and ground
appropriately.
To avoid electrical component damage, remove all
system power before plugging any connectors.
1. Follow the steps in Before Servicing, page 36.
2. Loosen the screws (124) and remove the
enclosure cover (117, not shown).
3. Note the position of the power supply input and
output wires. See Electrical Schematics, page 29.
Disconnect the wires from the power supply
(120).
4. Remove the screws (129) holding the power
supply to the side of the enclosure. Remove the
power supply.
5. Install the new power supply, using the screws
(129).
6. Reconnect the wires to the positions as noted
above.
7. Reinstall the cover (117) and tighten the screws
(124).
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8. Turn on power at the main circuit breaker.
9. Turn on the control box power switch.
NOTE: The green LED on the barrier board (106),
the green power LED on the EFCM module (139),
and the 24V green LED on each of the pump
control modules (132) will light when operating.
Figure 30 Replacing the 24 Vdc Power Supply
3A2800B