Universum FT-81031, Service Manual

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– hardware for simple 50/60-Hz to 100/ 120-Hz con-version (display frequency doubling)
– two I²C-controlled PWM outputs
– beam current limiter
Pinning:
1. Supply Voltage 28. Sup Volt, Analog Back-end
2. Gnd, Output Pin Driver 29. VRD/BCS DAC Ref, Beam Current Safety
3. Additional VSYNC input 30. Fast-Blank1 Input
4. Read counter Reset 31. Analog Red1 Input
5. FIFO Read Enable 32. Analog Green1 Input
6. FIFO Write Enable 33. Analog Blue1 Input
7. FIFO Write counter Reset 34. Fast-Blank2 Input
8. Horz. Drive Output 35. Analog Red2 Input
9. Horz. Flyback Input 36. Analog Green2 Input
10. Safety Input 37. Analog Blue2 Input
11. Vertical Protection Input 38. Test Pin
12. Select of H-Drv Freq. Range 39. Reset Input, active low
13. Clock Sel 40.5 or 27/32MHz 40. PWM out
14. Clock select 27/32 MHz 41. PWM out
15. Range Switch2, Measure ADC 42. Half-Contrast
16. Range Switch1, Measure ADC 43 50. Picture Bus Chroma
17. Sense ADC Input 51. Supply Volt, Digital Circuitry
18. Ground, MADC Input 52. Ground, Digital Circuitry
19. Differential Vert Sawtooth Out 53. Sys. Clock Input(27/32/40.5MHz)
20. Differential Vert Sawtooth Out 54 61. Y0 Picture Bus Luma
21. E/W Output 62. Single LLC Input(13.5/16MHz)
22. Reference Input for RGB DACs 63. Horizontal Sync Input
23. Scan Velocity Modulation 64. Vertical Sync Input
24. Analog Output Red 65. Analog Crystal Out (5-MHz Security Clock)
25. Analog Output Green 66. Analog Crystal In (5-MHz Security Clock)
26. Analog Output Blue 67. I²C-Bus Data
27. Ground, Analog Back-end 68. I²C-Bus Clock