TM 1-1520-238-T-5
8–13
8–6.
CONTROLS AND INDICATORS (cont)
8–6
Table 8–1.
Instrument Controls and Indicators
Dim/Test Panel
SWITCH/INDICATOR
POSITION
FUNCTION
Photocell
Adjusts instrument display brightness in relationship to
crew station lighting.
AUX PWR indicator
AMBER
Indicates SDC power or lamp supply fail, or the
DGT/TST/OFF switch is set to TST position.
DGT OFF/TST/NORM
three–position spring loaded
DGT OFF
Disables digital displays, allows vertical scales to operate
normally.
switch
TST
Initiates testing of all vertical scales, illuminates from
bottom to full scale for three seconds. All digital readouts
display in eights (888).
NORM
Indicates normal operation of both vertical scales and
digital readouts.
DIM variable control
Allows instrument brightness to be adjusted.
M68-156A
PHOTOCELL
AUX PWR INDICATOR
DGT
OFF / TST / NORM
SWITCH
DIM CONTROL
Dim/Test Panel
