Table 6-2 68K Processor Power Up Self-Test Error Codes - Tektronix Phaser 380 Service Manual

3. Observe the right LED; it represents tests on the main board's print
engine 68K processor. During power-up the LED flashes twice and
then stays lighted. It then blinks intermittently as the processor test
runs. Like the 29K LED, if it blinks in a, repeated pattern, the
processor is looping on a failed test. If the LED repeatedly flashes in
the same sequence then the 68K processor has encountered an error
and is looping. The possible LED-encoded error codes are listed
below. After a successful power-up, the right LED blinks in a regular 2
beat-pause-2 beat-pause pattern.

Table 6-2 68K processor power up self-test error codes

Right LED flashes Meaning
Long flash =5
Short flash=1
3L+1S=16
1 CPU Interrupt
2 Instruction ROM: Data Bus
3 Instruction ROM: Checksum
4 SRAM: Validate data paths
5 SRAM: Byte-wide device-independent test
6 SRAM: Memory cell test
7 SRAM: Validate address paths
8 PE NVRAM: Validate data paths
9 PE NVRAM: Memory cell test
10 PE NVRAM: Validate data paths
11 MC ASIC: Read registers only
12 MC ASIC: Validate data paths
13 MC ASIC: Write/read registers
14 MC ASIC: FIFO validation
15 DMC ASIC: Validate data paths
16 DMC ASIC: Write/read registers
17 DMC ASIC: ROM validation
18 DMC ASIC: Validate RAM blocks
19 DMC ASIC: Timer registers and IRQ
20 DMC ASIC: IRQ validation using test mode
21 DMC ASIC: ADC conversion
22 IPC validation (joint test with 29K processor
Troubleshooting
Service Manual 6-5
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