User's Manual

Screen Service SDT 200UB – SDT 500UB ARK-1 ATSC Operations
July, 2009 v 1.0 Page 3 - 94
Table 18. Alarms window
Alarm Description
I/A
(1)
Troubleshooting
RF
mask
Up converter Osc. Unlock
PLL of the Up-converter board not locked to 129 MHz
clock.
I/A
• Hardware fault
1
PS Voltage out range
Voltage out of range. The ranges are:
• 20V up to 30V for SDTx_ARK ATSC 20W and 50W;
• 38V up to 44V for SDTx_ARK ATSC 200W.
I/A
• Hardware fault
1
PS Current out of range
The current exceeds the 22 Ampere upper limit of
SDTx_ARK ATSC 20W and 50W and the 17 Ampere
upper limit of SDTx_ARK ATSC 200W.
I/A
• Hardware fault
1
Absolute Power Limiter The output power exceeds the maximum endurable limit. I/A
• Hardware fault
1
Communication error
Communication errors between ARK ATSC main board
and Up-converter board.
I/A
• Hardware fault
1
Temperature High Alarm
Case temperature over 70°C, the maximum endurable
limit.
I/A 1
Temperature Level-3dB
Temperature level goes over the alarm threshold.
The output power is consequently lowered by 3 dBm
(always within the admitted power range).
I/A
• Check alarm and warning thresholds
• Lower the output power to decrease internal temperature
0