Eventide ARGUS 3000 - Daughter Board Replacement; General; 3000 Or 5000 Daughter Board Replacement 37 H

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Section 8
DAUGHTER BOARD REPLACEMENT
8.1 General
The daughter board is a small board that is "piggy-backed" on to a larger board. This larger board is referred
; | to as the main power supply board or as the mother board. In order to remove the daughter board from the
lJ mother board, you must completely disassemble the Argus. The instructions for replacing the daughter board
in the model 3000 and 5000 are combined, since the two models are similar. The instructions for replacing the
i j daughter board in the model 7000 are given separately.
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The daughter board contains a potentiometer that controls the operating voltage of the unit. To operate correctly,
i i this voltage should be +5 volts. Check this voltage while the unit is still partially open. (The procedures
1 \ indicate the point at which voltage this should be checked.) If the voltage is not within .+.0.05 volts of +5 volts,
adjust the voltage. Sub-section 8.4 describes how to check and adjust this voltage.
U NOTE
i j When removing the screws, take note of their location, as it is important that they are replaced
\ i correctly.
■ Once the daughter board is replaced, be sure to return the old board to Eventide Avionics.
8.2 3000 or 5000 Daughter Board Replacement
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^ The ordering part number for the daughter board is #103005.
j I The Argus 5000 has an additional board (database board) that the 3000 does not have. The instructions that
^ follow take this into consideration.
i ! Necessary Tools: Small phillips head screwdriver
^ Digital voltmeter (to check the unit's voltage)
\ j Disassemble The Anzus
1. Remove the screws from the right side panel (panel nearest the operating controls). Note the
I j position of smaller screws versus larger ones. Remove this panel to expose the CPU in the 3000
U or the database board in the 5000. If the Argus is a model 3000, skip step 2 below.
i i 2. In the model 5000, two pairs of small pins and two 28 pin connectors on the component side of the
U database board connect it to the underlying CPU board. The connectors are located near the front
panel bezel. Gently pull on the database board, lifting it up from the back of the unit and wiggling
/ j it gently to disengage it from the connector on the CPU board. Remove the database board from
y the unit's housing.
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Argus Maintenance Manual Part #5006 July, 1993 Page 37