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TROUBLESHOOTING
RPW and WPW adjustment
1. Set jumper JMP 1 to the test (T) position.
2. Attach the oscilloscope test lead to the RPW test point.
3. Observe the waveform pUlse-width (see FIGURE 4-2). The pulse width
should be 250 ns. +--10%.
4. Attach the test lead to the WPW test point and observe the pulse
width. The width should be 125 ns. +-10%.
5. The RPW and WP'V adjustments are rarely necessary. Perform only if
the adjustments were inadvertently altered.
6. Return jumper JMP 1 to the (R) position.
7. Verify disc operation.
READ AND
WRITE
PULSE WIDTH
TEST POINTS:RPW= 250ns.
--
/
Wpw- ' 1 25ns.
--
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~1
--
...-'
~
,--
,--
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r -
1--- _ _ _ _
--
- -
SCOPE SETIINGS:
1 V/div., .5usec./div.
Figure 4-2
4-8
,..-
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