Maintenance
6-- 32
TDS1000B and TDS2000B Series Oscilloscope Service Manual
Signal at J202
(2-channel models) or
J1 (4-channel models)
Description
8 FPTHERMGND_P Temp Sense Return Ground.
9GND 0 V (ground)
10 FPDATA_34_P
1
Front Panel Scan Data line B
No fixed pattern. Stable when triggered from FPCLR_34_P. Pattern
depends upon 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 two-channel models.
2
Unused and tied low on two-channel models.
10. If all of the signals are present, the front-panel board is probably defective.
Replace it.
11. If some or all of the signals are missing, continue with step 12.
12. Turn off the oscilloscope and disconnect the front-panel cable from the main
board at connector J202 (two-channel models) or J1 (four-channel models).
13. Turn on the oscilloscope and check connector J202 (two-channel models) or
J1 (four-channel models) for the same signals as in step 9.
14. If some or all of the signals are missing, the main board is probably
defective. Replace it.
To troubleshoot the main board (acquisition module), follow these steps:
1. Remove the rear case using the procedure Rear Case on page 6--9.
Troubleshooting the Main
Board
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