Apple Service Diagnostic
Like Apple Hardware Test, Apple Service Diagnostic (ASD) works within Open Firmware to perform low-level hardware tests. However, it is designed specifically for Mac models incapable of booting into Mac OS 9. It was first introduced in June 2002 for use with Xserve systems. Apple later released ASD for 2003 models of PowerBook, iMac, Power Mac, and Xserve (Slot Load) systems. Make sure you are using the version of ASD that corresponds to the Mac model you want to test.
If you suspect your computer has a hardware issue, the information that Apple Service Diagnostic provides can help identify the trouble. If ASD detects an issue, an error is displayed. Make a note of the error before proceeding. If ASD does not detect a hardware failure, the issue may be software related.
ASD Access and Documentation
AASPs can download the appropriate version of Apple Service Diagnostic, along with a Read Me file and either a test results guide or a user's guide. After reviewing these documents, you will be able to complete the following exercise.
MORE INFO
For details on Apple Service Diagnostic, refer to Knowledge Base document 112125, “Service Diagnostics Matrix.”
NOTE
The public and ATT users do not have access to the Service Source area where CD images are stored. However, the companion CD includes Apple Service Diagnostic for the sample models.
ASD Exercise
Using the documentation you have just read, answer the following questions:
| 1: | Can ASD check an external FireWire drive? |
| 2: | What two looping options does ASD offer? |
| 3: | Describe a known issue regarding ASD tests of VRAM. |
| 4: | What two steps does Apple recommend you take before starting up from the ASD CD? |
| 5: | What key command do you use to start testing using ASD 2.0.3? |
ASD Exercise Answer Key
| A1: | No |
| A2: | Number of looping tests and elapsed time of looping tests |
| A3: | When testing video RAM, the screen display may appear blank for an extended period, depending on how much video RAM is installed. |
| A4: | Turn the computer off and on, and check cables, peripherals, and user controls. |
| A5: | Control-G |