Figure 17 Fsk Signal - Philips 50 T Series Service Manual

Test Point
1 +2.5V DC
2 +2.5V DC overlayed a sine
0.5 to 1Vpp
FSK-signal 1.6kHz/2.4kHz.
See Figure 18.
3 +5V DC
1. Do not forget to program the Serial Number to the Transmitter Board using the Service Software.
Without the correct Serial Number the +5V and the FSK signal are not present, as they are switched off.
Chapter 8 - RF Bench Repair
Correct Signal
8. Check the RF output signal with a Spectrum Analyzer 100Hz to
MHz, with an Active Probe 500 MHz (AC coupled, offset OFF).
The Spectrum Analyser should be set as follows:
START frequency
STOP frequency
Resolution Bandwidth
Video Bandwidth
Reference Level
Action If Signal Incorrect
Replace Transmitter Board.
Replace Transmitter Board.
Replace Transmitter Board.
Figure 18 FSK Signal
400 MHz
500 MHz
100 kHz
100 kHz
+10 dBm
Transmitter VCXO Test
1
1
1
≥
500