Appendix A: Model 4010 Components
106
Model 4010 Display Board
Table 30: Model 4010 Display Board jumpers and pots
J1
1
JP1
Unselect Speaker
R1
1
JP2
R21
JP3
Select Speaker
R32
R34
R7
(P/N 702-9378)
JP2
Adjusts the backlight brightness to low (L), medium (M), or high (H).
The default setting is H.
R1
Adjusts the minimum volume of the unselect speaker. Older units may
have a different pot number, but the pot is located in the same location.
R7
Adjusts the unselect speaker bias. This is adjusted at the factory.
Adjusting this incorrectly can lead to a damaged op-amp
. See
R21
Adjusts the display contrast. This is adjusted at the factory and
typically does not need adjustment.
R32
Adjusts the minimum volume of the select speaker. Older units may
have a different pot number, but the pot is located in the same location.
R34
Adjusts the select speaker bias. This is adjusted at the factory.
Adjusting this incorrectly can lead to a damaged op-amp
. See
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