Service manual

SIGNAL BACKPLANE BACKPLANE DESTINATION

NAME CONNECTION OUTPUT

D_LRCLK J23, PINS 1+62 J21, PIN 1 TO DSP BOARD

D_SCLK J23, PINS 2+61 J21, PIN 3 TO DSP BOARD

D_FSYNC J23, PINS 3+60 J21, PIN 5 TO DSP BOARD

SYNC_RX J23, PINS 5+58 J32, PIN 5 TO BRAIN BOARD

SYNC_TX J23, PINS 6+57 J32, PIN 7 TO BRAIN BOARD

B_SCLK J23, PINS 7+56 J17, PIN 8+55 TO ALL FX CARDS (J17, J14, J16 AND J51, ALL

PIN 8+55)

B_LRCLK J23, PINS 8+55 J17, PIN 13+50 TO ALL FX CARDS (J17, J14, J16 AND J51, ALL

PIN 13+50)

MCLK J23, PINS 9+54 J22, PIN 9+54 TO ALL TAPE CARDS AND EXTRA (J22, J20,

J19, J18, ALL PIN 9+54)

SCLK J23, PINS 10+53 J22, PIN 10+53 TO ALL TAPE CARDS AND EXTRA (J22, J20,

J19, J18, ALL PIN 10+53)

LRCLK J23, PINS 11+52 J22, PIN 11+52 TO ALL TAPE CARDS AND EXTRA (J22, J20,

J19, J18, ALL PIN 11+52)

MUTE J23, PINS 12+51 J15, PIN 1 TO CODEC BOARD AND ALL TAPE CARDS,

EXTRA AND DIG IO (J22, J20, J19, J18 AND

J30, ALL PINS 12+51)

RESET J23, PINS 13+50 J15, PIN 3 TO CODEC BOARD AND ALL TAPE CARDS,

EXTRA AND DIG IO (J22, J20, J19, J18 AND

J30 ALL PINS13+50) AND ALL FX CARDS (J17,

J14, J16 AND J51, ALL PIN 6+57)

UNMUTE J23, PINS 14+49 J24, PIN 27 TO DSP BOARD

A_MCLK J23, PINS 16+47 J15, PIN 9 TO CODEC BOARD

A_SCLK J23, PINS 17+46 J15, PIN 7 TO CODEC BOARD

A_LRCLK J23, PINS 18+45 J15, PIN 5 TO CODEC BOARD

The clock card

The clock card generates the main clock signals used throughout the console. On other boards there

are a few local clocks used, for example, for the serial Rx and TX connection to the remote CPU.

This table shows the signal flow from the clock card to the various boards in the D8B. The clock card

fits into connector J23 on the backplane board. From there, the signals are distributed to other boards

either by ribbon connectors, or using the backplane’s buses to the Tape cards, FX cards, and Digital IO.

Have a look at the schematics/pcb layouts of the clock card. The last page of that chapter has a pcb

layout with traces and some signals and voltages marked. Also refer to the connectors chapter for more

details of each connector mentioned in the table below.

CLOCKS