# | Problem | Cause | Solving |
---|---|---|---|
1 | The PLL locks, but the sync LED doesn't turn on. | The input data is inverted. |
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2 | Recording stops unexpectedly. | Signal quality is low (sync LED is flashing sometimes) | Change the "Record times' parameters in the Preferences (chapter 'Record'). Increase the 'Stop after' number. E.g. a value for (C)HRPT of 60 (=60/6=10 sec) and 570 for HRI (=570/57=10 sec) should bridge a period of 10 secs out-of-sync. |
Signal quality is good; sync LED is not flashing. Probably crosstalk on the par. port cable | Disconnect pin 15 of par. port, connect pin 15 (at PC side) to ground instead. This disables 'automatic recording stop' after out-of-sync. If that solves the problem then there is crosstalk on the par. port cable. Try another cable. | ||
3 | Leds of channels selected switch off by itself after recording has started. Connecting pin 20 of left FPGA to ground after channel selection and before start of record solves the problem. | Crosstalk on the par. port cable. | Increase R14 and/or C11. |
4 | Pictures are very noisy if more than 1 channel is selected. If 1 channel is selected pictures look fine. | Crosstalk on the par. port cable. | Try another par. port cable. |
5 | Distorted line (or line parts), decoder doesn't go out-of-sync | Xtal oscillator (second FPGA) doesn't work properly. |