Original
7e.23/24
May 01
KH 2020
Chap 7e
YES
YES
NO
NO
RADAR FAULT
DETECTED AT DISPLAY
(AT STANDBY)
IS D43 (HEATER V)
LED LIT?
IS Tx READY IND
PRESENT AFTER 90s?
SWITCH TO RUN
CHECK CONNECTIONS,
MAINS INPUT &
POWER SUPPLY FUSE(8A)
CD-4191
ON Tx/Rx PSU
IS MAINS NEON LIT?
ON Tx
MICROCONTROLLER
IS D41 FLASHING?
(PROC RUNNING
LED)
YES
NO
NO
POWER SUPPLY FAULT
Tx MICROCONTROLLER
FAULT OR CABLEFORM
CONNECTION FAULT
IS HEATER V
AT MAGNETRON
5.7 - 6.3V?
YES
NO
FAILURE MESSAGE
- NO AZIMUTH
- NO HEADING LINE
IS THE
ANTENNA TURNING?
NO
YES
IS THE TURNING
MECHANISM SAFETY
SWITCH ON?
NO
YES
FAULT IN HEADING LINE PCB
OR CONNECTIONS THROUGH
Tx MICRO-CONTROLLER PCB
YES
IS HEATER INPUT
AT MODULATOR 10V?
NO
YES
SUSPECT MODULATOR FAULT
OR Tx MICRO CONTROLLER
RIBBON CABLE FAULT
CHECK POWER SUPPLY
OUTPUT & WIRING
TO MODULATOR
SWITCH TURNING
MECHANISM SAFETY
SWITCH ON
IS MAINS ON
INDICATOR ON
INVERTER ON?
YES
Tx MICROCONTROLLER PCB
NO
IS TRANSCEIVER
RUNNING?
NO
YES
FAILURE MESSAGE
- NO SYNC
- NO VIDEO
OR NO MESSAGE
TO SHEET 2
REPAIR CONNECTIONS
IF NECESSARY.
OTHERWISE POWER SUPPLY
OR EMC FILTER FAULT
IS D43 (HEATER V)
LED LIT?
YES
NO
DISCONNECT CABLEFORM
TO RECEIVER & MODULATOR
TO SEE IF FAULT CLEARS
1S +24V
PRESENT BETWEEN
PLA PINS 1 & 2 ON
INVERTER?
NO
YES
WIRING FAULT BETWEEN
TRANSCEIVER AND INVERTER
OR
TX MICROCONTROLLER PCB
FAULT
NOTE: TO BE USED WITH DETAILED UNIT DATA FOR VARIOUS UNITS
ANTENNA TURNING
MECHANISM FAULT
REFER TO KH 1250 MKVI
TURNING MECHANISM
KH1253 MKVII
TURNING MECHANISM
SWITCH SINGLE PHASE
MAINS ON
IS MAINS ON
INDICATOR ON
SOFT START
UNIT ON?
YES
TX MICROCONTROLLER PCB
NO
IS TRANSCEIVER
RUNNING?
NO
YES
1S +24V
PRESENT BETWEEN
TB2 PINS 1 & 2 ON
SOFT START
UNIT?
NO
YES
WIRING FAULT BETWEEN
TRANSCEIVER AND INVERTER
OR
TX MICROCONTROLLER PCB
FAULT
ANTENNA TURNING
MECHANISM FAULT
REFER TO KH 1250 MKVI
TURNING MECHANISM
KH1253 MKVII
TURNING MECHANISM
SWITCH THREE PHASE
MAINS ON
INVERTER
SOFT START UNIT
iF ABOVE IS OK, SUSPECT
MODULATOR FAULT
OR Tx MICRO CONTROLLER
RIBBON CABLE FAULT
Figure 12e - Flowchart (sheet 1 of 2)
Figure 12e (Sheet 1)
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
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