Maintenance
Table 24: Expected signals at J202 (cont.)
Signal at J202 Description
10 FPDATA_34_P
1
Front Panel Scan Data line B No fixed 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 a re 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 sam e signals as in
step 9.
15. If some or all of the signals are missing, the M ain board is probably defective.
Replace it.
TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual 79
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