e. Turn the unit on and allow a 5-minute warm-up period.
f. Compare the indicated value of the unit's dvm and the external multimeter.
g. Adjust R7, on pcb D3, until the unit's dvm reading is the same as the
multimeter connected across K3 N and L (See figures 2-5 and 2-6).
(1) To increase the voltage reading on the unit's dvm, turn R7
counterclockwise until it matches the reading with the multimeter connected across K3
N and L.
(2) To decrease the voltage reading on the unit's dvm, turn R7 clockwise
until it matches the reading with the multimeter connected across K3 N and L.
The incoming line voltage must be between 109 and 133vac at 60 Hz or 109
and 132vac at 50 Hz for the unit to function properly.
VERIFY/CALIBRATE EXPOSURE TIME
To perform the exposure time verification with a mechanical counter, use the
a. Turn the unit off.
b. Connect the counter to test points D1.4 and D1.21 on circuit board D1. See
figures 2-7 and 2-8.