Black Box ACS235A - Manual (Page 90)

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CHAPTER 6: Operation
Three (AGC enabled only): Low blue. Even applying max AGC, the unit
can’t equalize the color signals, of which blue is at the lowest level.
There’s trouble with the blue transmit diode, fiber, or receive diode.
F: Contrast is turned up too high at the Remote Module for AGC to work
properly. Turn the contrast down using the contrast dial on the Remote
Module’s rear panel.
H: HSYNC missing. Either there’s a problem with the green/HSYNC
fiber or the CPU-side extension cables, or a jumper has been set wrong
in the ACS235A Local Module—probably JP6 or JP11 (see Section 3.2.1).
V: VSYNC missing. Either there’s a problem with the blue/VSYNC fiber
or the CPU-side extension cables, or a jumper has been set wrong in the
Local Module, probably JP10 or JP11 (see Section 3.2.1 or 4.1.1).
b: Blank pulse missing. There’s a problem with the green/HSYNC fiber.
C: Distortion at receiver’s data interface. Either there’s a problem with
fiber 1, fibers 1 and 2 have been transposed, or there’s an internal error
in the Local Module.
A: Distortion at transmitter’s data interface. There’s an internal error in
the Remote Module.