Samsung DSR9500EMVIA - Manual (Page 34)

Troubleshooting
Samsung Electronics 4-3
NO RF-MOD OUTPUT
Q823 Base is High?
Q824 Collecter is 5V?
Check MOD801.
Check U106.
Yes
Yes
No
No
Check L801.
No
Video signal occur
Q807 Emittter?
U801 (12, 14)
video signal is OK?
Yes
Yes
No
Check Q824.
Check U801.
When RF channel tunning,
I2C CLK, data are OK?
: R166, R168.
Check Q807.
Yes
BD75 is 30 3V?
Yes