I did misread the circuit drawing The two 4K are in series. So what you are seeing on pin 2 is VREF.
How can the comparator work if this voltage always is VREF?
I agree with Groundloop:
The pulse width modulator comparator provides a means
for the error amplifiers to adjust the output pulse width from
the maximum percent on−time, established by the deadtime
control input, down to zero, as the voltage at the feedback
pin varies from 0.5 V to 3.5 V. Both error amplifiers have a
common mode input range from −0.3 V to (VCC − 2V), and
may be used to sense power−supply output voltage and
current. The error−amplifier outputs are active high and are
ORed together at the noninverting input of the pulse−width
modulator comparator. With this configuration, the
amplifier that demands minimum output on time, dominates
control of the loop.
This is from ON-semi spec. sheet TL494.
Take care, peace