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Maintenance
Table 24: Expected signals at J202 (cont.)
Signal at J202
Description
10 FPDATA_34_P
1
Front Panel Scan Data line B No
fi
xed pattern. Stable when
triggered from FPCLR_34_P. Pattern depends on rotation of
knobs being scanned.
11 FPCLR_34_P
2
Front Panel Clock line B 405 kHz. High with 50 ns pulses going
low. Each clock after FPCLR_34_P increments the scan location
by one.
12 FPCLK_34_P
2
Clear Front Panel Scan line B 6.44 kHz. Low pulsing high with
50 ns pulses. Determines beginning of a scan sequence for
second half of front panel.
1
Unused and open on 2-channel models.
2
Unused and tied low on 2-channel models.
11.
If all of the signals are present, the Front-Panel board is probably defective.
Replace it.
12.
If some or all of the signals are missing, continue with step 13.
13.
Turn off the oscilloscope and disconnect the front-panel cable from the Main
board at connector J202.
14.
Turn on the oscilloscope and check connector J202 for the same signals as in
step 9.
15.
If some or all of the signals are missing, the Main board is probably defective.
Replace it.
TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual
79
Содержание TDS1001C-EDU
Страница 12: ...Preface x TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Страница 30: ...Specifications 18 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Страница 32: ...Where to Find Operating Information 20 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Страница 52: ...Performance Verification 40 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Страница 60: ...Adjustment Procedures 48 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Страница 85: ...Maintenance TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual 73...
Страница 96: ...Maintenance 84 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...
Страница 110: ...Replaceable Parts 98 TDS2000C and TDS1000C EDU Series Oscilloscope Service Manual...