Service manual

STP 11-25R13-SM-TG
K - 2
K-4. Completely Shorted Parallel Tank Circuit Components.
If either of the parallel tank circuit components were to go completely short, the load would also be
effectively shorted. The output voltage would drop to zero at all frequencies (see Figure K-2D). As with
any short, the current drawn from the source would increase and one or more components might burn
out. This condition would most likely occur at or near the resonant frequency of the series components.
K-5. Open Series Components.
If either of the series components shown in Figure K-1 were to open, the current would stop. The
output voltage would drop to zero at all frequencies (Figure K-3).
Figure K-3. Open Series Component
K-6. Bandpass Filter With No Parallel Components.
Figure K-4. Bandpass Filter (with no parallel components)
NOTE: Refer to Figure K-4 for the following discussion.
a. If the series capacitor were to short out, the circuit would act like a low pass filter, and the
frequency response curve would resemble Figure K-4B.
b. A partial short in the series inductor would result in a frequency response curve with an
increased fall time at the upper end (Figure K-4C). A completely shorted series inductor would cause the
circuit to act like a high pass filter; the response curve would resemble Figure K-4D.
K-7. Band Reject Filter Troubleshooting.