Owner`s manual

NexSys
®
Modules
Troubleshooting
1. The new FPGA code uses the “Mute” LEDs to decode faults with
the amplifier. If the MUTE LED is lit, then the following fault has
occurred:
Channel 1 Mute LED: Heat sink Temperature reading is not within limits as read
from U37 pin 5 on main PCB. (0 - 80 degrees C).
Channel 2 Mute LED: Transformer Temperature sensor is bad or not plugged
in (J13 on main PCB).
Channel 3 Mute LED: Power supervisors are reporting faults (U5 and U10 on
FPGA board)
Channel 4 Mute LED: AC Voltage is not within limits (80V to 250V AC) as read
from U18 on main PCB
Channel 5 Mute LED: +12V_DRV voltage is not within limits as read from U37
pin 10 on main PCB.
Channel 6 Mute LED: +V_Rail and -V_Rail are not with limits as read by U37
pins 6 and 7 (+/-25V to ±100V)
Channel 7 Mute LED: Unregulated +15V is not within limits as read from U37
pin 9 (8.5V to 25V)
Channel 8 Mute LED: -5V regulated voltage is not within limits as read from
U37 pin 11 (-4.2 to -5.5)
The limits set above will allow a ±30VDC power supply to be hooked to J8 on the
main board for testing.
CH1 - Temperature fault: Heatsink Temp sensor, rear temp sensor or Transformer
temp sensor is out of range.
CH2 - Transformer temp sensor is set.
CH3 - Low voltage supervisors issue.
CH4 - AC Voltage is out of range.
CH5 - The FET Driver voltage (+12V_DRV) is out of range.
CH6 - The High voltage rails (+V_RAIL, -V_RAIL) are out of range.
CH7 - The unregulated +15V (15V-UNREG) rail is out of range.
CH8 - The -5V rail is out of range.
2. The new FPGA code will still display the revision during turn-on initialization on
the SIGNAL and IGM/ACL LEDs (see testing instruction for more info).
3. The ribbon cables to the LOAD MONITOR PCB assemblies must be plugged in
for the amp to initialize properly. Channels 1-4 ribbon cable connects to J21 on the
FPGA PCB. Channels 5-8 ribbon cable connects to J14 on the FPGA PCB.