Chapter 9 209
Block Diagrams
Signal Mnemonics
Signal Mnemonics
Faulty assemblies can be identified by confirming that a specific signal
on an assembly is not at its expected level.
Table 9-1 Mnemonic Descriptions
Mnemonic Description
ACOM Analog ground (chassis)
CALOSC_H Differential ECL 21.4 MHz calibration oscillator output from the analog IF board to the RF board
CALOSC_L Differential ECL 21.4 MHz calibration oscillator output from the analog IF board to the RF board
DCOM Digital ground (single point ground inside the power supply)
FP_BLUE0 Flat panel display blue 0 (LSB) signal from the CPU board to the front panel interface board
FP_BLUE1 Flat panel display blue 1 signal from the CPU board to the front panel interface board
FP_BLUE2 Flat panel display blue 2 signal from the CPU board to the front panel interface board
FP_BLUE3 Flat panel display blue 3 (MSB) signal from the CPU board to the front panel interface board
FP_CBLANKL Flat panel display blanking signal from the CPU board to the front panel interface board
FP_CLK Front panel bus 7.5 MHz clock signal from the CPU board to the front panel interface board
FP_CSL Front panel bus chip select signal from the CPU board to the front panel interface board
FP_D0 Front panel bus data 0 (LSB) signal from the CPU board to the front panel interface board
FP_D1 Front panel bus data 1 signal from the CPU board to the front panel interface board
FP_D2 Front panel bus data 2 signal from the CPU board to the front panel interface board
FP_D3 Front panel bus data 3 signal from the CPU board to the front panel interface board
FP_D4 Front panel bus data 4 signal from the CPU board to the front panel interface board
FP_D5 Front panel bus data 5 signal from the CPU board to the front panel interface board
FP_D6 Front panel bus data 6 signal from the CPU board to the front panel interface board
FP_D7 Front panel bus data 7 (MSB) signal from the CPU board to the front panel interface board
FP_DOTCLK Flat panel display 25 MHz dot clock signal from the CPU board to the front panel interface board
FP_GREEN0 Flat panel display green 0 (LSB) signal from the CPU board to the front panel interface board
FP_GREEN1 Flat panel display green 1 signal from the CPU board to the front panel interface board
FP_GREEN2 Flat panel display green 2 signal from the CPU board to the front panel interface board
FP_GREEN3 Flat panel display green 3 (MSB) signal from the CPU board to the front panel interface board
FP_HSYNCL Flat panel display horizontal sync signal from the CPU board to the front panel interface board
FP_P15SBY Front panel +15V standby power supply from the fan control board to the front panel interface
board
FP_PWR_RST_L Front panel bus power on reset signal from the CPU board to the front panel interface board
FP_RED0 Flat panel display red 0 (LSB) signal from the CPU board to the front panel interface board
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