
Maintenance
4-9
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
START
Audio at pin 8
of U3101?
Check Controller
Yes
No
Induce or inject 1st IF into
XTAL Filter
IF Freq: 44.85 MHz
Audio heard?
B
Yes
No
Check 2nd Voltage at
U3101 Pin 4
Level
approx. +6
dBm?
B
Yes
No
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
Check Y3200. If OK
check/replace U3101
Содержание HT1250-LS+
Страница 10: ...viii ...
Страница 12: ...x Product Safety and RF Exposure Compliance ...
Страница 16: ...1 4 Introduction ...
Страница 58: ...4 22 Maintenance ...
Страница 64: ...5 6 Schematic Diagrams Overlays and Parts Lists ...
Страница 102: ...5 44 Schematic Diagrams Overlays and Parts Lists Figure 5 34 Keypad PassPort Option Board Schematic Diagram ...