Other SOS Detection Circuits
SOS Detect (P, SC, and SS Board)
Figure 42
This drawing is used to verify an SOS condition that may have originated from the P,
SC, or SS Board. The connector information should be used for troubleshooting
purposes. Instead of using a peak hold voltmeter, the power supply connector of the
board causing the blinks of the power LED may be disconnected to see if the unit
remains on after power up. If it does, this usually indicates that the problem is located in
the disconnected board. If the power LED continues to generate the same amount of
blinks, more troubleshooting is required.
Note:
The unit will become totally inoperative if the power supply to the D and DG
boards is disconnected. The system control circuit will be unable to power the unit and
monitor the SOS lines.
46
Summary of Contents for TH-42PX50U
Page 40: ...SC board Waveform Figure 30 SU And SD Board Shift Registers Figure 31 35 ...
Page 43: ...SS Board Schematic Figure 33 SS Board Waveform Figure 34 38 ...
Page 66: ...Adjustment Volume Locations Figure 53 61 ...
Page 67: ...Test Point Locations Figure 54 62 ...
Page 71: ...Scan and Sustain Drive Waveform Figure 55 Scan and Sustain Drive Check points Figure 56 66 ...
