Smiths Kelvin Hughes Nucleus 3 5000 Series, System Handbook

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Links and switches are located on the following PCBs:
(1) 25kW FET Modulator PCB (CTX-A345)
(2) Tx Microcontroller PCB (CTX-A346)
(3) Logarithmic Receiver PCB (CTX-A356)
Original 7d.13 May 01
KH 2020
Chap 7d
Switch Grid State Function
SW1-1 4A ON
OFF
HL Interlock enabled
HL Interlock overridden
SW1-2 OFF
ON
Timer enabled
Timer disabled
SW1-3 ON
OFF
Jitter enabled
No Jitter
SW1-4 OFF
ON
HTLO inhibit enabled
HTLO inhibit override
SW1-5 SPARE
SW1-6 X A2 CAN bus } Set 0 to 7
A1 CAN bus } to give 1 of 8
A0 CAN bus } address codes
SW1-7 X
SW1-8 X
SW2-6 3A OFF
ON
Memory bank select
No software in this memory
SW2-5 ON
OFF
Ext trig terminated
Ext trig not terminated
SW2-4 ON
OFF
CAN bus terminated
CAN bus not terminated
Link/
Switch
Grid State Function
LK1 4G MADE
OPEN
Connects 300V power output to
FET drivers
Disconnects 300V power output
from FET drivers
SW1 9F MADE
OPEN
E27V to SMPS Output
Transformer (T1)
HT (300V). Disabled for testing
SW2-A 3H MADE
OPEN
AMC connected
AMC replaced with RV1 for
servicing (Factory use only)
SW3-A 2E MADE
OPEN
Slope Control circuit working
Slope control replaced by RV4
for servicing (Factory use only).
SW4-A 7H MADE
OPEN
+27V current overload
protection circuit working
For low power test of current trip
level (Factory use only)
Link State Function
LK1 Tune Sample delay
(intermediate, approx 50ns)
LK2 Tune Sample delay
(maximum, approx 100ns)
LK3 Tune Sample delay (minimum)
NOTE: Only one of LK1, LK2 or LK3 is to be
MADE. Selected for best AFC
LK4 Not Fitted
LK5 B
A
A & B
OPEN
Minimum AFC lock
Intermediate AFC lock
Maximum AFC lock
LK6 A
B
3 bandwidths selected, SP, MP and
LP/VLP
2 bandwidths selected, SP and LP
LK7 OPEN
MADE
Minimum Vco gain
Maximum Vco gain
LK8 OPEN
MADE
X-band Selected
S-Band Selected
LK9 OPEN
MADE
S-Band Selected
Sets regular output to +5V
(X-band only)
Switch Grid State Function
SW2-3 ON
OFF
Enables edge drive of noise
diode
Square wave drive
SW2-2 ON
OFF
Video I/P terminated
Video I/P unterminated
SW2-1 OFF
ON
Antenna motor starts on RUN
Antenna motor ON all the time