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PART FOUR - SERVICE AND MAINTENANCE
SECTION 1 - GENERAL INFORMATION
Rev. 7-1201
Model P63 pH Analyzer
99
1.3 Replacing Relays
WARNING:
DISCONNECT LINE POWER TO AVOID THE POSSI-
BILITY OF ELECTRICAL SHOCK.
1.
After disconnecting line power, loosen the four screws
on the analyzer front door, and swing the door open.
Disconnect the ribbon cable connector.
2.
If analyzer is not equipped with EMI-hardened option,
disregard this step, and proceed with step 3.
If analyzer has EMI-hardened option:
A.
Remove the screw holding the thin metal divider
between TB3 and TB4, and remove the divider.
B.
Loosen (but do not remove) the two screws secur-
ing the thin metal bracket that shields the ribbon
cable connector. Remove the bracket by sliding it
to the right from under the screws and pulling it
outward.
3.
Remove the two screws above the terminal strips and
carefully extract the power supply board assembly.
4.
On the outer perimeter of the component side of the
board, unsolder the four tabs holding the metal cover
(on terminal strip side) to access the relay pins.
5.
Unsolder the defective relay. Replace it with an
equivalent relay (see PART FIVE for relay part num-
ber).
6.
Reinstall the power supply board assembly following
the previous steps in reverse order.
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