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8150 Technical Guide
If your 8150 does not have the Frame Delay Output module, modify and
connect the A28 for use with the 8150 as follows. If you do have the Frame
Delay Output module, you can use the A28 without this modification,
as long as the 8150 output connected to the A28 is set to one frame delay.
If your A28 was shipped after January 1995, skip steps 1 through 10 and
begin with step 11.
STEP 1:
STEP 2:
STEP 3:
STEP 4:
STEP 5:
STEP 6:
STEP 7:
STEP 8:
9100-0212-04 - May 2000
Make sure you have the A28 Timing Modification Upgrade
Kit (Accom P/N 9300-00-7900) before you begin. This
modification lets you delay the A28 output sync and burst to
match the delay of the 8150. The modification kit consists of
a programmed IC and some rework wire.
If the A28 is installed in a rack, remove all cables from the rear
of the unit, labeling them to make it easier to reconnect them
when you are finished. If the A28 is not installed in a rack,
continue to the next step.
At the front of the A28 chassis, remove the four small screws
along the lower edge of the front plate. At the rear of the
chassis, remove the four larger screws at the corners of the
rear connector panel.
Press on the rotary knobs to slide the bottom chassis tray out
the rear of the housing. Set the bottom tray (with the circuit
board) on a work surface.
Remove the option module(s) from the Main board by
removing the three screws that secure the module(s) to the
rear panel.
Loosen the Main board by removing the hex screws from the
rear D subconnectors. Slide the board forward and up to
remove it from the chassis.
On the solder side of the Main board, connect pin 13 of IC
U29E to pin 16 of DIP switch U15Q with the rework wire.
On the component side of the board, remove the IC at location
U29E and replace it with the IC from the kit, labeled 457302.
Encoding the 8150 Output (NTSC)
Engineering Setup
5-85
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