## DCC Error Information

DCC errors are displayed on the DCC board LED.

If error MP-160 occurs during startup, check the DCC board LED, cycle power and watch the LED. A sequence of characters flashes on the LED as testing takes place. Each character represents a test of a specific system component or of communication between components. If one of these tests fails, the character representing that test remains on the LED. The DCC Led sequence is:

A | Testing shared RAM memory cells
B | Testing DCC to MP interrupt
C | Testing MP interrupt acknowledge
D | Testing MP to DCC interrupt
E | Testing DCC ROM and RAM
F | All tests passed - waiting for first MP interrupt

If the DCC board fails after the system is on, error MP-060 or MP-151 occurs. These errors indicate that the MP is unable to communicate with the DCC board. Check the DCC board LED for the following numbers:

1 | 32 ms since last D/A update
2 | 32 ms since last MP update
3 | DCC to MP interrupt not acknowledged for 32 ms
8 | System running normally
9 | Waiting for initial MP shared RAM sync-up

On the DCC board LED, a decimal point before the error number means the CPU is inactive. A decimal point after the error number means the hardware detected a failure to update the D/A for 32 milliseconds.

The following table contains the available DCC error codes:

DCC-001
DCC-002
DCC-003