IN DI CA TORS, TEST POINTS, LINKS AND
SWITCHES (FIG URES 7e, 8e & 9e)
41
Indicators provided on PCBs are as follows:
(1) 25kW FET Modulator PCB (CTX-A345)
(2) Tx Microcontroller PCB (CTX-A346)
42
Test Points are located on the following PCBs:
(1) 25kW FET Modulator PCB (CTX-A345)
May 01
7d.12
Original
KH 2020
Chap 7d
Grid
D22
9G
300V SAFE
Illuminated when +27V
disconnected from 300V
power supply circuits
(SW1 set to OFF)
D23
9F
300V UNSAFE
Illuminated when +27V
applied to 300V power
supply circuits (SW1 set
to ON)
D24
4G
300V ACTIVE
Illuminated when 300V
supply present Note: only
illuminated when Tx Run
command present
D33
6E
HEATER
Illuminated when Heater
Turndown circuit is active
TURNDOWN
D34
7D
S BAND
Illuminated for S-Band
Magnetron use
Grid
D18
8F
TUNE
Illuminated when Tune Ind
signal is present
D41
4E
PROCESSOR
RUNNING
Flashes when processor
is running
D42
4E
EXT TRIG
Illuminated when External
Trigger pulses are present
D43
4E
HEATER OK
Illuminated when Heater
OK, flashes slowly when
timer is running. Flashes
Fast when heater has
timed out
D44
4E
Not Used
Test
Point
Grid
TP1
7H
TR14 Gate Drive (27V/300V FET)
TP2
8H
TR15 Gate Drive 927V/300V FET)
TP3
3J
+5V
TP4
6D
+5V1
TP5
2H
REF V
TP6
9E
+10V
TP7
4J
+15V
TP8
9C
+27V Power
TP9
4J
+27V-B
TP10
3J
-15V
TP11
1E
Output of IC14 (Trig Op Amp)
TP12
1D
Output of IC15, buffer for TRNN and TRNN
(FET Gates Drive)
TP13
1C
Output of IC16 delay buffer for TR7 & TR9
(Tail Biter for FET Gates)
TP14
2B
Output of TRNN and TRNN (Main FETs
Drive)
TP15
4G
Shorting Point to test the 300V
TP16
1G
Output of IC2a (HV >250V)
TP17
2J
Output of IC8b (Slow Start Ramp)
TP18
2J
Output of IC8a (AMC drive to IC1)
TP19
2H
IC8a Pin 3 (SET Mag Current)
TP20
2G
Output of IC7 (Sample and Hold)
TP21
2G
IC7 pin 11 (Sample Pulse)
TP22
1J
Output of IC3a (Main FET I is tripped)
TP23
1H
Output of IC3b (27V Power >6 amps) (I/P
Overload Trip)
TP24
6E
Output of IC4b (27V Power >3 amps, Heater
Turndown)
TP25
3F
Output of IC10 (Main FETs I Mon Pulse)
TP26
6D
Output of IC12a (Magnetron Type Detected)
TP27
7E
Output of IC12b (Magnetron Fitted)
TP28
2D
Positive for IC17 (approx. +24V)
TP29
2D
Drain of TR9, FET Gate Amp
TP30
1E
FET Drive Voltage
TP31
4H
Positive end of D16 (+100V for Tx Mon)
TP32
8F
Positive end of D9 (to check L2 OK)
TP33
6F
Negative end of D11 (to check L2 OK)
TP34
2J
Input end of R10 (RUN STOP Command)
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
Page 27: ...THIS PAGE IS INTENTIONALLY BLANK Sep 01 ii Amdt 1 KH 2020 Index Introduction ...
Page 73: ...THIS PAGE IS INTENTIONALLY BLANK KH 2020 Chap 2a July 03 2a 6 Amdt 5 ...
Page 101: ...THIS PAGE IS INTENTIONALLY BLANK May 01 3 6 Original KH 2020 Chap 3 ...
Page 109: ...THIS PAGE INTENTIONALLY BLANK July 03 viii Amdt 5 KH 2020 Index Chap 1 3 ...
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Page 275: ...THIS PAGE IS INTENTIONALLY BLANK July 03 5 18 Amdt 5 KH 2020 Chap 5 ...
Page 279: ...THIS PAGE IS INTENTIONALLY BLANK Sep 01 iv Amdt 1 KH 2020 Index Chap 4 5 ...
Page 309: ...THIS PAGE IS INTENTIONALLY BLANK Sep 01 xiv Amdt 1 KH 2020 Contents Chap 7 8 ...
Page 356: ...Original 7c 19 May 01 KH 2020 Chap 7c CD 2413 Figure 16c Modulator PCB Switches Test Points ...
Page 359: ...THIS PAGE IS INTENTIONALLY BLANK May 01 7c 22 Original KH 2020 Chap 7c ...
Page 381: ...THIS PAGE IS INTENTIONALLY BLANK Sep 01 7d 26 Amdt 1 KH 2020 Chap 7d ...
Page 425: ...THIS PAGE IS INTENTIONALLY BLANK May 01 8a 22 Original KH 2020 Chap 8a ...
Page 445: ...THIS PAGE INTENTIONALLY BLANK July 03 8aA 16 Amdt 5 KH 2020 Chap 8a Annex A ...
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