User's Manual Part 3

Screen Service SDT 501 UB-C ARK 1-T Operations
May, 2010 v 1.0 Page 3 - 93
Table 14. Alarms window
Alarm Description and limitations Troubleshooting
Up converter Osc. Unlock PLL of the Up converter board not locked to 120 MHz clock.
• Hardware fault
PS Voltage out range (for STDX
20/50/201) or
PS1/PS2 Voltage alarm (for STDX
501)
Voltage out of range. The ranges are:
• 20V up to 30V for SDTx_ARK1-T SDTX 20/50;
• 38V up to 44V for SDTx_ARK1-T SDTX 201/501.
• Hardware fault
PS Current out of range or (for STDX
20/50/201) or
PS1/PS2 Current alarm (for STDX
501)
The current exceeds the 22 Ampere upper limit of
SDTx_ARK1-T 20W and 50W and the 17 Ampere upper limit
of SDTx_ARK1-T 200W.
• Hardware fault
Absolute Power Limiter The output power exceeds the maximum endurable limit.
• Hardware fault
Up converter Communication error
Communication errors between ARK1-T main board and
Up-converter board.
• Hardware fault
Temperature High Alarm Case temperature over 70°C, the maximum endurable limit.
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).
Temperature High Warning Temperature level goes over the warning threshold.
• Check alarm and warning thresholds
• Lower the output power to decrease internal temperature