Hyundai HSS-730 Service Manual page 24

HSS-730/830 & UFD505/515 SERVICE MANUAL
5.11. Can't download software via RS-232C Port
Check that
Power is provided to RS-232C
Driver.
U3 is in good condition (pin 7 of
RS-232C Driver showes –10V with
main power on. If the measurement
is 0V the device is in fail).
5.12. LNB power doesn't output. (View circuit diagram)
Check that
LNBP_EN is HIGH
LNB_22V is input to LM317
Voltage Pin 1(input), 2(output) at KSB1151
5.13. LNB power 14V(18V) doesn't change to 14V(18V) (view circuit diagram)
Check that
Pin 192 of STi5518 is controlled
according to menu setting.
HIGH : 14V. LOW : 18V
Pin 192 of STi5518 is good. But
14V(18V) doesn't change to
18V(14V). Then switching.
TR is in fail.
Ch1 TIN2 (pin 10 of MAX232)
Ch2 TXD of RS232 port
Ch1 LNB1
HDT DVB SATELLITE STB
Page 24