Esco Airstream PCR-3A, Руководство по обслуживанию

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38
Polymerase Chain Reaction Cabinets
Lights always OFF
Connection Problem
For PCR:
• Unplug the cabinet from the main supply.
•
See Layout A at the end of this section to locate the relay
board, fluorescent ballast, and connector B inside electrical
panel.
• Check forany loosedor bad connectionbetween relay
board, fluorescent lamp ballast, and female connector B.
• See Figure 8-1 to locate terminal J13 on relay board, check
tightness of 2 cables connected to J13.
• For connector B, disconnect the male side from electrical
panel, then check male and female side for any bad
connection.
•
Check also connection ofthe lamp holder (see
Figure 7-3). For SCR:
• Unplug the cabinet from the main supply.
• See Layout B at the end of this section to locate the
fluorescent ballast and connector B inside electrical panel.
• Checkforanyloosedorbadconnectionbetweenlight
switch, fluorescent lamp ballast, and female connector B.
•
For connector B, disconnect the male side from electrical
panel, then check male and female side connectors for any
loose or wrong connection.
• Check also connection of the lamp holder (see Figure 7-3).
Faulty relay or fuse
(For PCR only)
• Unplug the cabinet from the main supply.
•
Open the top access cover and locate electrical panelinside.
• See Layout A at the end of this section to locate the relay
board inside electrical panel.
• Check relay LS7 and fuse F7 on the relay board. See Figure 8-
2 below.
•
If fuse F7 is blown, as temporary solution, use F5 to replace
F1. The fuse F5 is not used and is a spare fuse.
•
On terminal J13, 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.
Fig 8.2
DOMINIQUE
DUTSCHER
SAS