60
Remote Control using the RS-232 Port
Control Board Preparation
If your K2 serial number is 3000 or higher, or if you have previously
installed a KIO2 option in your K2, skip the steps on this page and
continue with
RS-232 Interface Setup and Test
on page 61.
Turn off the K2.
Before handling the Control board in the
following steps, touch a grounded surface.
Remove the screws that hold the K2 Control board to the front panel
board. Also remove the audio filter module if present.
Use the long-handled Allen wrench supplied with the K2 to pry the
Control board up at the point marked "LIFT HERE" on the RF board.
Place the Control board in front of you, component side up.
Figure 41
shows the
bottom
side of the Control board, where most
of the changes will be made. One trace will be cut on the
top
side.
The trace between Q5-gate and U6 pin 25 must be cut as shown
below.
This trace is located on the top side of the Control board.
Once
you have located the trace, use a sharp tool such as an X-acto knife to
make two small cuts near the location marked with an "X". Press
down
with the tip--don't draw the knife
across
the trace, since you may slip,
cutting adjacent pads or traces. Next, pry up and remove the small
segment between the cuts. Examine the trace closely to make sure the cut
segment is completely removed.
Cut a 3/4" (19 mm) length of the supplied green-insulated hookup
wire, and remove 1/8" (3 mm) of insulation from each end. Install and
solder this jumper on the bottom of the board, between Q5-gate and U8
pin 4, as shown below. Make sure the jumper doesn't contact adjacent
pads or component pins.
Solder a .001 µF, 0.2" LS capacitor ("102") across P4, pins 1 and 5.
(Listed as
Ctxd
in the parts list.)
Prepare a 4" (10 cm) jumper using hookup wire. Solder it between
U6 pin 25 and P4 pin 1 on the bottom side of the board (pin 1 is the round
pad). Make sure the jumper doesn't touch adjacent pins.
Re-install the Control board (and KAF2 if applicable)
U6
U8
40
25
P4
Q5
1
1
Cut trace on top side
Jumper, 4"
Jumper, 3/4"
(to pin 4 of U8,
not to RP7)
.001
µF
B ottom view of Control b oard
Figure 41
Содержание K2/100
Страница 1: ...1 Appendix G 100 W Stage and RS 232 I O K2 100 Rev H3 July 24 2017 E740035...
Страница 33: ...33 T4 5 6 GND J8 J3 J2 E1 FAN BLK RED BLACK RED B1 B2 B3 J7 J6 J2 J3 A2 A1 Fan Wires Solder Lug Figure 24...
Страница 42: ...42 Figure 33...
Страница 54: ...54 C C C Figure 40...
Страница 74: ...74 Parts Placment Drawing Bottom Side...
