Service manual

Page 13
SVR-250 Service Manual
Figure 2
UHF Receiver
1. Receiver front end: Connect a DC voltmeter to TP1 on the SVR-250 main board. Set the service monitor
connected to the SVR-250 to the generate mode, receive frequency with a 1kHz tone and 60% deviation.
Adjust the RF output of the monitor for a 1VDC reading at TP1. Adjust BPF1 and BPF2 on the RF board for
a maximum reading at TP1.
2. Repeater squelch: Adjust the service monitor RF output for .5μV. Adjust RV9 on the SVR-250 main board
so the repeater COR LED is just on. Decrease the service monitor RF output to .3μV and ensure that the
repeater COR LED is off.
3. Transmit audio output: Adjust the service monitor RF output for 1mV. Turn the CTCSS modulation on and
set for 15% deviation. Confirm that the repeater COR, CTCSS and mobile PTT LED’s are on. Adjust RV3
on the SVR-250 main board for 60% deviation as read on the service monitor connected to the mobile radio.
Turn off the CTCSS modulation of the service monitor connected to the SVR-250. Confirm that the repeater
CTCSS and mobile PTT LED’s are off.
4. Lock Tone Decode: Change the 1kHz tone modulation to the lock tone frequency. Confirm that the PRI LED
goes off after approximately .5 seconds.