|
|
| TROUBLESHOOTING | |
| Table | |||
Symptom | Cause | Checkpoint |
| Solution |
The printer does | The control ROM is | Confirm that the PROM is inserted the |
| Replace IC5. |
not operate at all. | defective. | socket correctly. |
|
|
| The gate array (IC1) | Check pin 86 (D0)of IC1 for a change |
| Replace IC1. |
| is defective. | in the signal (HIGH or LOW). |
|
|
| The CPU (IC2) is | Look at the oscillator at either pin 27 |
| Replace CRU1 or |
| defective | (x1) or pin 28 of the CPU. |
| IC1 |
| The DRAM (IC14) is | Observe pin 2 (D0) of IC14 for a |
| Replace IC14. |
| defective | change in the signal (HIGH or LOW). |
|
|
|
|
|
Rev. B | ||
