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84 ALSK / ALPK Not Present
If ALSK or ALPK board is not present or not connected to
the car CANbus or there is a communication fault in this
bus then this error is reported. Check terminal board,
CAN bus wiring and 24V power supply (100-1000).
Cause
Troubleshooting
1. Check if the can bus cables are connected proper and tight. the
connection from the main board to the ALPK or ALSK going
directly from CAN0 position of the DLC1 T/H board to CH - CL
of the ALSK - ALPK board and to the scb car top controller.
2. Check if the SCB car top Board have wrong connection also
(opposite flat cable direction usually).
3. Disconnect LOPs if they are connected and try again.
4. Turn around DLC1 T/H - ALPK/ALSK - SCB boars for a possible
burn line.
5. Check if there is voltage to all 1000-100 of ALPK/ALSK or SCB
boards.
TIP: Check electrical drawings pages 3-4-10
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