9710 VCA 17
000216
Use the 3 nylon wire ties to group the four wires together by placing
one in the middle and the other two halfway to either end. Cinch the
ties tight and clip off the excess.
( ) Turn the control shafts of all the potentiometers fully Counter
ClockWise and mount each knob in turn by placing it on the
shaft and aligning the pointer with CCW end of the panel
graphic. Tighten the set screw slightly and rotate the control
back and forth to see that its range of rotation is centered
with respect to the panel graphic. Loosen the screw and
realign the knob as needed and fully tighten when done.
Locate the power connector header. If there is an unused connector
location on the power supply, this is the best place to mount the
header. Because of the 9700 series star grounding system it is also
acceptable to chain power from one module to the next as shown in
the illustration.
Be very careful that the Signal Ground (SG) and
power Ground (G) lines are not interchanged between modules.
Note the orientation of the locking tab shown in the illustrations.
( ) Push the header's 4 pins through the board but solder only
one. Make sure the base is flush with the board before
soldering the remaining three pins.
The next step will be to power up the module and start testing, which makes this is an great
time to take another break, stretch and think about something else for a while. When you
come back take the time to do a final check. The flying wires to the panel aren't bundled with
wire ties yet, and we'll leave them that way for now, so move them around a little to check the
connections. Inspect the wiring on the panel and make sure none of the bare wire used as the
panel ground is in danger of shorting against other connections. One more pass of inspecting
the board for component polarity and quality of solder joints is a
good idea too.
TESTING
Set the Modulation Null and Carrier Null trimmers (R24 and R34)
to the midpoint of their rotation, make sure the power supply is
turned off and mate the power connectors. No signal inputs or
outputs are needed for these first tests.
1) Set the 9710 knobs and switch as shown and turn on power.
First observe the POWER light on the power supply and if it
doesn't come on stop and find out why.
It may be just a dead
outlet or some more serious problem such as a solder bridge
on the 9710 board. If the power supply light comes on when the
9710 is disconnected, it's a sure sign of a problem on the 9710
board. The most likely area for this problem is in the area around
the power connector, R1, R2, C1, C2 and regulators IC1 and IC2.
locking tab
FracRak format
power supply
(9770, midi2cv8, etc.)
(-)
(SG)
(+)
(G)
Powered
Board
(-)
(SG)
(+)
(G)
Powered
Board
(-)
(SG)
(+)
(G)
Power Supply
(9770, midi2cv8, etc.)
ETC.
