DOC AIRBUS | TSM A320FSystem Control Unit (SCU)
TASK 23-33-71-810-802-A
System Control Unit (SCU)
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 23-33-71-710-052-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 23-33-71-810-051-A ** ON A/C NOT FOR ALL
Subtask 23-33-71-710-053-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:25:41 UTC
System Control Unit (SCU)
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 23-28-45-000-001 | Removal of the Attenuator |
| AMM 23-28-45-400-001 | Installation of the Attenuator |
| AMM 23-33-00-740-005 | BITE-Test of the integrated Passenger Entertainment System |
| AMM 23-33-37-000-001 | Removal of the IFE Audio/Video Controller |
| AMM 23-33-37-400-001 | Installation of the IFE Audio/Video Controller |
| AMM 23-36-34-000-002 | Removal of the Cabin Management Terminal (CMT) |
| AMM 23-36-34-400-002 | Installation of the Cabin Management Terminal (CMT) |
Subtask 23-33-71-710-052-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 23-33-71-810-051-A ** ON A/C NOT FOR ALL
A. Maintenance Action
(1) SCU Fault LED ON
(a) Turn OFF the master power of the RAVE System.
(b) Make sure that the connectors are correctly attached on the back of the SCU.
(c) Make sure that the SCU is installed correctly into the mounting tray and that the hold down latches are correctly secured.
(d) Turn ON the master power of the RAVE system.
(e) Let the SCU start up fully and make sure that the Fault LED is OFF.
(f) If the Fault LED starts up to RED, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
Subtask 23-33-71-810-052-A ** ON A/C NOT FOR ALL (1) SCU Fault LED ON
(a) Turn OFF the master power of the RAVE System.
(b) Make sure that the connectors are correctly attached on the back of the SCU.
(c) Make sure that the SCU is installed correctly into the mounting tray and that the hold down latches are correctly secured.
(d) Turn ON the master power of the RAVE system.
(e) Let the SCU start up fully and make sure that the Fault LED is OFF.
(f) If the Fault LED starts up to RED, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
B. Maintenance Action
(1) SCU Fan Speed Failure (except PN 00-5013-XX)
(a) Make sure that there is no foreign object that stops the SCU Fan to turn.
(b) Power Cycle the IFE System. If the SCU temperature is still below a certain limit, multiple power cycles are needed to clear this fault.
(c) If on start-up the fan is not functional, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
(d) If on start-up the fan is functional but the error message still appears, the Control Panel (CP) reports a false positive.
(e) Contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for further direction.
Subtask 23-33-71-810-054-A ** ON A/C NOT FOR ALL (1) SCU Fan Speed Failure (except PN 00-5013-XX)
(a) Make sure that there is no foreign object that stops the SCU Fan to turn.
(b) Power Cycle the IFE System. If the SCU temperature is still below a certain limit, multiple power cycles are needed to clear this fault.
(c) If on start-up the fan is not functional, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
(d) If on start-up the fan is functional but the error message still appears, the Control Panel (CP) reports a false positive.
(e) Contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for further direction.
NOTE: If the temperature is below a certain limit, the SCU fans will slow down or not turn. After the temperature reaches a 19 deg.C (66.20 deg.F), the fans will turn at the expected RPMs. A later version of a RAVE software will address this issue.
C. Maintenance Action
(1) Media Validation Error
(a) Power cycle the IFE System.
(b) Once the system starts up and the Control Panel (CP) show "Media Validation Error" for the SCU, make sure that the LED light for the SD Card slot is amber.
(c) If the SD Card LED Indicator comes up as amber and the CP reports "Media Validation Error" contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for the replacement of the SD Card.
Subtask 23-33-71-810-055-A ** ON A/C NOT FOR ALL (1) Media Validation Error
(a) Power cycle the IFE System.
(b) Once the system starts up and the Control Panel (CP) show "Media Validation Error" for the SCU, make sure that the LED light for the SD Card slot is amber.
(c) If the SD Card LED Indicator comes up as amber and the CP reports "Media Validation Error" contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for the replacement of the SD Card.
D. Maintenance Action
(1) SD Card Content Error
(a) Power cycle the IFE System.
(b) Once the system starts up and the Control Panel (CP) show "SD Card Content Error" for the SCU Primary, make sure that the LED light for the SD Card slot is amber.
(c) If the SD Card LED Indicator comes up as amber and the CP reports "SD Card Content Error" contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for the replacement of the SD Card.
Subtask 23-33-71-810-056-A ** ON A/C NOT FOR ALL (1) SD Card Content Error
(a) Power cycle the IFE System.
(b) Once the system starts up and the Control Panel (CP) show "SD Card Content Error" for the SCU Primary, make sure that the LED light for the SD Card slot is amber.
(c) If the SD Card LED Indicator comes up as amber and the CP reports "SD Card Content Error" contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for the replacement of the SD Card.
E. Maintenance Action
(1) SD Card Media Access Error
(a) Power cycle the IFE System.
(b) Once the system starts up and the Control Panel (CP) shows "SD Card Media Access Error" for the SCU, make sure that the LED light for the SD Card slot is amber.
(c) If the SD Card LED Indicator comes up as amber and the CP reports "SD Card Media Access Error" contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for the replacement of the SD Card.
Subtask 23-33-71-810-057-A ** ON A/C NOT FOR ALL (1) SD Card Media Access Error
(a) Power cycle the IFE System.
(b) Once the system starts up and the Control Panel (CP) shows "SD Card Media Access Error" for the SCU, make sure that the LED light for the SD Card slot is amber.
(c) If the SD Card LED Indicator comes up as amber and the CP reports "SD Card Media Access Error" contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for the replacement of the SD Card.
F. Maintenance Action
(1) USB Content Error/USB Media Access Error
(a) Power cycle the IFE System.
(b) If the fault status remains, contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for a replacement of the SD Card.
Subtask 23-33-71-810-058-A ** ON A/C NOT FOR ALL (1) USB Content Error/USB Media Access Error
(a) Power cycle the IFE System.
(b) If the fault status remains, contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for a replacement of the SD Card.
G. Maintenance Action
(1) Crew Panel Unable to Connect to SCU
(a) Make sure if the Fault RED LED Indicator is ON.
(b) Wait for approximately 120 seconds to allow the Control Panel (CP) to connect to an active SCU.
(c) Once connected, make sure if the Primary SCU (SCU1) is still the active SCU.
(d) If the CP continue to show the "Attempting to connect to SCU" on the screen, turn OFF the master power of the RAVE system.
(e) Check if the connectors are attached on the back of the SCU. Make sure that the SCU is seated correctly into the mounting tray and that the hold down latches are correctly secured.
(f) Turn ON the master power of the RAVE system.
(g) When the system starts up allow 120 seconds for the CP to connect to an active SCU. If the CP shows the "Attempting to connect to SCU" on the screen, make sure one more time that the Fault RED LED Indicator is not ON.
(h) Turn OFF the master power of the RAVE system.
(i) Remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001 with a known good unit.
(k) Turn ON the master power of the RAVE system. If the CP shows the login screen proceed to troubleshoot any network breaks.
(l) Once all network breaks are fixed, turn OFF the master power of the RAVE system and reconnect the power.
(m) If a circuit breaker was pulled, push the fuse back in.
(n) Secure the SCU to the mounting tray and secure the hold down latches.
(o) Turn ON the master power of the RAVE system and check that the CP connects and the "Attempting to connect to SCU" does not show on the screen.
(p) If the CP continue to show the "Attempting to connect to SCU" on the screen, turn OFF the master power of the RAVE system and disconnect the power to the primary SCU.
(q) Remove the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001 from the mounting tray.
(r) Turn ON the master power of the RAVE system. If the CP shows the login screen, proceed to troubleshoot any network breaks.
(s) Once all network breaks are fixed, turn OFF the master power of the RAVE system.
(t) If you don't use the PN 00-5013-XX, reconnect the power cable (J3) to the Primary SCU:
(v) If the CP continue to show the "Attempting to connect to SCU" on the screen, turn OFF the master power of the RAVE system and disconnect the power from the primary SCU.
(w) Turn ON the master power of the RAVE system. If the CP shows the login screen, proceed to troubleshoot any network breaks.
(x) Once all network breaks are fixed, turn OFF the master power of the RAVE system and reconnect the power cable to the Primary SCU.
(y) Turn ON the master power of the RAVE system and check that the CP connects and the "Attempting to connect to SCU" does not show on the screen.
(z) If the CP continue to start up in the "Attempting to connect to SCU" on the screen turn OFF the master power of the RAVE system.
(aa) Undock the Removable Display Unit (RDU) and remove the Display Docking Station (DDS) (11MH-1) AMM 23-36-34-000-002.
(ab) Using a small plier, very gently tug at each wire to check for broken wires or cold solder.
(ac) Re-solder broken wire if necessary.
(ad) Install the DDS (11MH-1) AMM 23-36-34-400-002.
(ae) If the CP continue to start up in the "Attempting to connect to SCU" on the screen, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
Subtask 23-33-71-810-059-A ** ON A/C NOT FOR ALL (1) Crew Panel Unable to Connect to SCU
(a) Make sure if the Fault RED LED Indicator is ON.
(b) Wait for approximately 120 seconds to allow the Control Panel (CP) to connect to an active SCU.
(c) Once connected, make sure if the Primary SCU (SCU1) is still the active SCU.
(d) If the CP continue to show the "Attempting to connect to SCU" on the screen, turn OFF the master power of the RAVE system.
(e) Check if the connectors are attached on the back of the SCU. Make sure that the SCU is seated correctly into the mounting tray and that the hold down latches are correctly secured.
(f) Turn ON the master power of the RAVE system.
(g) When the system starts up allow 120 seconds for the CP to connect to an active SCU. If the CP shows the "Attempting to connect to SCU" on the screen, make sure one more time that the Fault RED LED Indicator is not ON.
(h) Turn OFF the master power of the RAVE system.
(i) Remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001 with a known good unit.
NOTE: The DDS will need to be reconfigured to be a CP.
(j) If the CP continue to start up in the "Attempting to connect to SCU" screen turn OFF the master power of the RAVE system. (k) Turn ON the master power of the RAVE system. If the CP shows the login screen proceed to troubleshoot any network breaks.
(l) Once all network breaks are fixed, turn OFF the master power of the RAVE system and reconnect the power.
(m) If a circuit breaker was pulled, push the fuse back in.
(n) Secure the SCU to the mounting tray and secure the hold down latches.
(o) Turn ON the master power of the RAVE system and check that the CP connects and the "Attempting to connect to SCU" does not show on the screen.
(p) If the CP continue to show the "Attempting to connect to SCU" on the screen, turn OFF the master power of the RAVE system and disconnect the power to the primary SCU.
(q) Remove the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001 from the mounting tray.
(r) Turn ON the master power of the RAVE system. If the CP shows the login screen, proceed to troubleshoot any network breaks.
(s) Once all network breaks are fixed, turn OFF the master power of the RAVE system.
(t) If you don't use the PN 00-5013-XX, reconnect the power cable (J3) to the Primary SCU:
- If a circuit breaker was pulled, push the fuse back in.
- Secure the SCU to the mounting tray and secure the hold down latches.
(v) If the CP continue to show the "Attempting to connect to SCU" on the screen, turn OFF the master power of the RAVE system and disconnect the power from the primary SCU.
(w) Turn ON the master power of the RAVE system. If the CP shows the login screen, proceed to troubleshoot any network breaks.
(x) Once all network breaks are fixed, turn OFF the master power of the RAVE system and reconnect the power cable to the Primary SCU.
(y) Turn ON the master power of the RAVE system and check that the CP connects and the "Attempting to connect to SCU" does not show on the screen.
(z) If the CP continue to start up in the "Attempting to connect to SCU" on the screen turn OFF the master power of the RAVE system.
(aa) Undock the Removable Display Unit (RDU) and remove the Display Docking Station (DDS) (11MH-1) AMM 23-36-34-000-002.
(ab) Using a small plier, very gently tug at each wire to check for broken wires or cold solder.
(ac) Re-solder broken wire if necessary.
(ad) Install the DDS (11MH-1) AMM 23-36-34-400-002.
(ae) If the CP continue to start up in the "Attempting to connect to SCU" on the screen, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
H. Maintenance Action
(1) SCU Host SW INOP
(a) Power cycle the IFE System.
(b) Make sure that the SCU starts up and after initializing, the SW LED amber light ON.
(c) If the SCU starts up with the SW LED amber light ON, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001 and contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com".
Subtask 23-33-71-810-060-A ** ON A/C NOT FOR ALL (1) SCU Host SW INOP
(a) Power cycle the IFE System.
(b) Make sure that the SCU starts up and after initializing, the SW LED amber light ON.
(c) If the SCU starts up with the SW LED amber light ON, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001 and contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com".
I. Maintenance Action
(1) Content not shown throughout the cabin
(a) Select "Maintenance Mode".
(b) Push the "Configuration" button.
(c) Touch "Set Date & Time".
(d) Set the time to the current UTC and then touch "Update".
(e) Power cycle the IFE system.
Subtask 23-33-71-810-061-A ** ON A/C NOT FOR ALL (1) Content not shown throughout the cabin
(a) Select "Maintenance Mode".
(b) Push the "Configuration" button.
(c) Touch "Set Date & Time".
(d) Set the time to the current UTC and then touch "Update".
(e) Power cycle the IFE system.
J. Maintenance Action
(1) SCU SW Update Failed
(a) Remove the SW SD Card from the SCU.
(b) Turn OFF the master power of the RAVE System.
(c) Check the connectors of the SCU to make sure that they are connected correctly.
(d) When the SCU starts up, make sure that it is connected to the CP.
(e) Insert the SW SD Card and initiate a SW Load.
(f) If SW Update is completed, the previous SD Card is corrupt.
(g) Contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for replacement card.
(h) If the SW Update cannot be completed, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
Subtask 23-33-71-810-062-A ** ON A/C NOT FOR ALL (1) SCU SW Update Failed
(a) Remove the SW SD Card from the SCU.
(b) Turn OFF the master power of the RAVE System.
(c) Check the connectors of the SCU to make sure that they are connected correctly.
(d) When the SCU starts up, make sure that it is connected to the CP.
(e) Insert the SW SD Card and initiate a SW Load.
(f) If SW Update is completed, the previous SD Card is corrupt.
(g) Contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com" for replacement card.
(h) If the SW Update cannot be completed, remove and replace the I.F.E.CONTROLLER [311MK] AMM 23-33-37-000-001 AMM 23-33-37-400-001.
K. Maintenance Action
(1) Data Offload Issues (Maintenance Reports show No Data)
(a) If all the RAVE aircrafts have offload issues at the same time, check with the account provider for the SIM card.
(b) If the issue is only seen at a specific aircraft and the other aircrafts offload with no issues, check that the SIM cards are installed correctly:
5. Close-up(1) Data Offload Issues (Maintenance Reports show No Data)
(a) If all the RAVE aircrafts have offload issues at the same time, check with the account provider for the SIM card.
(b) If the issue is only seen at a specific aircraft and the other aircrafts offload with no issues, check that the SIM cards are installed correctly:
- Turn OFF the master power of the RAVE system and then make sure that the SIM card exposed copper section faces down and the notched edge of the SIM Card faces outward.
- Turn ON the master power of the RAVE system and perform a simulated flight.
- Make sure that the SCU WLess LED goes from flashing to solid.
NOTE: This step must be performed at the home base. The home base airport must be selected (at the Control Panel (CP) for the Arrival city prior to start the simulated flight).
(c) At the CP and in the Maintenance Mode, make sure the AT-GATE discrete is showing a yellow dot (AT-GATE asserted). - If the AT-GATE shows a gray dot, the discrete line going from the aircraft to the SCU is not connected. Wiring will need to be checked.
- If the Data Offload section is missing flights, contact "Zii" Customer Support at "customer.support#agrave#imsco-us.com".
- If the attenuator is correctly secured, replaced the attenuator with a known good attenuator
[23RV1] AMM 23-28-45-000-001 AMM 23-28-45-400-001.
Subtask 23-33-71-710-053-A ** ON A/C NOT FOR ALL
A. Do the test given in Para. 3.A.