12
TROUBLESHOOTING - IF SOMETHING GOES WRONG........................................................................................ 21
12.1
N
O POWER
.......................................................................................................................................................................... 21
12.2
F
AN NOT WORKING
............................................................................................................................................................. 22
12.3
I
F THE
FAULT
LIGHT TURNS ON
........................................................................................................................................ 22
12.4
O
VER
-
TEMPERATURE CUT
-
OFF
........................................................................................................................................... 22
12.5
O
VER
-
CURRENT CUT
-
OFF
................................................................................................................................................... 22
12.6
I
G
2
BLINKS FAST
-
N
O PLATE VOLTAGE
.............................................................................................................................. 22
12.7
S
PARKS
/
D
ISCHARGES IN
RF
AREA
.................................................................................................................................... 23
12.8
SWR
CUT
-
OFF
.................................................................................................................................................................... 23
12.9
F
REQUENT OVER
-
DRIVE PROTECTION CUT
-
OFF
.................................................................................................................. 23
12.10
T
UBE REPLACEMENT
...................................................................................................................................................... 23
13
WARRANTY / SERVICE .................................................................................................................................................. 23
14
GLOSSARY ......................................................................................................................................................................... 24
15
APPENDIX 1: SCHEMATIC DIAGRAMS ..................................................................................................................... 25
15.1
B
LOCK
D
IAGRAMS
............................................................................................................................................................. 25
15.1.1
DX-3SP Block Diagram ............................................................................................................................................ 25
15.1.2
AC INPUT AND WIRING DIAGRAM ....................................................................................................................... 26
15.2
C
IRCUIT
D
IAGRAMS
........................................................................................................................................................... 27
15.2.1
SOFT START Single Phase – Circuit Diagram ......................................................................................................... 27
15.2.2
HIGH VOLTAGE POWER SUPPLY – Circuit Diagram .......................................................................................... 28
15.2.3
RF Module Simplified................................................................................................................................................ 29
15.2.4
RF output circuit ....................................................................................................................................................... 30
15.2.5
QSK – Circuit Diagram............................................................................................................................................. 31
15.2.6
RF Sensor .................................................................................................................................................................. 32
15.2.7
DISPLAY BOARD – Circuit Diagram....................................................................................................................... 33
15.2.8
CONTROL BOARD – Circuit Diagram .................................................................................................................... 34
15.3
C
ONTROL
B
OARD AND
A
DJUSTMENT
P
OINTS
..................................................................................................................... 35
15.3.1
Control Board Component Layout ............................................................................................................................ 36
15.3.2
Control Board – Solder Side Track work .................................................................................................................. 37
16
APPENDIX 2: WAVEFORMS .......................................................................................................................................... 38
16.1
QSK
S
WITCHING
............................................................................................................................................................... 38
16.2
L
INEARITY
......................................................................................................................................................................... 38
17
APPENDIX 3: ADJUSTMENTS ....................................................................................................................................... 39
17.1
C
ONTROL
B
OARD
............................................................................................................................................................... 39
17.1.1
PRE-BIAS ADJUSTMENT ........................................................................................................................................ 39
17.1.2
BIAS ADJUSTMENT ................................................................................................................................................. 39
17.1.3
SWR PROTECTION ADJUSTMENT ........................................................................................................................ 40
17.1.4
EBS ADJUSTMENT .................................................................................................................................................. 41
17.1.5
SCREEN VOLTAGE ADJUSTMENT ........................................................................................................................ 41
17.1.6
SCREEN CURRENT LIMIT ADJUSTMENT............................................................................................................. 41
17.1.7
IPTRIP ADJUSTMENT ............................................................................................................................................. 42
17.2
D
ISPLAY
B
OARD
A
DJUSTMENTS
........................................................................................................................................ 43
17.2.1
PLATE CURRENT .................................................................................................................................................... 43
17.2.2
PLATE VOLTAGE..................................................................................................................................................... 44
17.2.3
REFLECTED POWER .............................................................................................................................................. 44
17.2.4
FORWARD POWER.................................................................................................................................................. 44
17.2.5
SCREEN CURRENT.................................................................................................................................................. 44
17.3
RF
S
ENSOR
(B
RIDGE
)
A
DJUSTMENT
................................................................................................................................... 45
