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TROUBLESHOOTING
RPW and WPW adjustment
1. Perform the preceding power-on, jumper, and warm up procedure
(steps 1 through 3).
2. Attatch the oscilloscope test lead to the RPW test point.
3. Observe the waveform pulse-width(see figure 4-4). The pulse width
should be 250 ns. +-10%.
4. Attatch the test lead to the WPW test point and observe the pulse
width. The width should be 125 ns. +-10%.
5. The RPW and WPW adjustments are rarely necessary. Perform only if
the adjustments were inadvertently altered.
6. Return the ADJ jumper to the original position, and remove the
ground lead.
7. Verifydisc operation.
READ AND WRITE PULSE WIDTH
TEST POINTS:RPW= 250ns.
x
WPW= 128ns.
SCOPE SETTINGS:
1tV/div., Busec./div.
Figure 4-4
4-7
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