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2. Press and hold the two B keys shown below, and then turn on the
power switch.
3. Press the EXECUTE button to begin the test.
4. The test is carried out repeatedly. Data is saved and loaded, and
then the two data sets are compared. The number of times that
the test results in OK or NG are counted and displayed on the
LCD. To interrupt the test, press the EXECUTE button while the
"EXECUTE" display is blinking.
- Even when the Floppy Disk Drive is functioning properly, the
test can result in NG. If this happens frequently, clean the
magnetic heads of the Floppy Disk Drive with a cleaning disk.
Then, change the disk used in testing with another disk and
reperform the test. If the trouble is not solved, it is likely that
the Disk Drive unit or some other part of the hardware is
broken.
8. PRECAUTIONS BEFORE SERVICING
8.1. Precautions for measuring of the output waveforms
1. The waveform was measured with a "National Digital Storage
Oscilloscope VP-5730A". Therefore the waveforms of musical
tone signals shown may differ somewhat due to the difference in
the timing of triggering.
2. Since the 1/10 test probe is used, the indicated voltage value on
the bottom part of each waveform illustration is 1/10 of the actual
value (e.g. 0.2 V/cm should be 2.0 V/cm).
3. To measure the waveforms, first set this unit to the service
diagnostic mode (refer to
SYSTEM
test). The WAVE ROM output will then be output as a
sine wave to facilitate the servicing check.
8.2. Important safety notice
- Components identified by a
important for safety.
- When replacing any of these components, use only manufacture's
specified parts.
"SOUND SYSTEM
; mark have special characteristics
13
test" on
SOUND
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