Esco SCR-2A2 - Page 56

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Polymerase Chain Reaction Cabinets
Cannot turn ON UV
Lamp
Faulty relay or fuse
For PCR:
• Unplug the cabinet from the main supply.
• Open the top access cover and locate electrical panel inside.
• See Layout A at the end of this section to locate the relay
board inside electrical panel.
• Check LS8 relay and fuse F8 on the relay board (see Fig. 9.6).
• If fuse F8 is blown, as temporary solution, use F5 to replace
F8. The fuse F5 is not used and is a spare fuse.
• On terminal J15, check the Normally Open (NO) to
Common and Normally Closed (NC) to Common (C) circuits
by checking continuity. Normally Open to Common doesn’t
have continuity while the Normally Closed to Common has
continuity.
• If the NO to Common and NC to Common contacts are not
correct, replace the Relay Board.
For SCR:
• Unplug the cabinet from the main supply.
• Open the top access cover and locate electrical panel inside.
• See Layout B at the end of this section to locate the relay
board inside electrical panel.
• Check the K1, K2, and K3 relays. See Fig. 9.7 below.
• Check the Normally Open (NO) to Common and Normally
Closed (NC) to Common (C) circuits by checking continuity.
Normally Open to Common doesn’t have continuity while
the Normally Closed to Common has continuity.
• If the NO to Common and NC to Common contacts are not
correct, replace the relays.
Fig. 9.6
Fig. 9.7
DOMINIQUE DUTSCHER SAS