Tektronix Phaser 550 Service Manual page 137

Table 6-2 Print engine service error codes (cont'd.)
Error code Meaning of error code and what to do about it
70 Program ROM Check sum error.
1. Replace the engine control board.
71 Program SRAM Check sum error.
1. Replace the engine control board.
72 EEPROM read/write error.
1. Replace the engine control board.
80 VSYNC time-out.
1. Check connection between the image processor board and the
engine control board
2. Replace the engine control board.
3. Replace the image process board.
81 Power missing error.
1. Engine control board not powered. Check wiring harness CN5 to the
engine control board.
82 Serial time-out error.
1. Check the connection between the image processor board and the
engine control board.
2. Replace the image process board.
3. Replace the engine control board.
83 Command error. The image processor sent bad data to the engine
control board
1. Reset the image processor NVRAM.
2. Check the connection between the image processor board and the
engine control board.
3. Replace the image process board.
4. Replace the engine control board.
84 Parity error.
1. Reset the image processor NVRAM.
2. Check the connection between the image processor board and the
engine control board.
3. Replace the image process board.
4. Replace the engine control board.
Troubleshooting
Service Manual 6-23
6