May 01
7c.14
Original
KH 2020
Chap 7c
FAILURE MESSAGE
NO SYNC
NO VIDEO
FROM FIGURE 1
NO SYNC
NO VIDEO
POOR SIGNALS
BUT NO VIDEO WARNING
CD-0295
25.04.01
SET TO LONG PULSE
NO
YES
ARE
RECEIVER
CONNECTIONS OK
FROM LOW NOISE FRONT
END & CABLE-
FORMS?
NO
YES
IS LED D4 OFF
(HEATER CURRENT OK)?
NO
YES
CHECK CONTROL
BOARD LEDs
IS PSU +9.5V LED ON?
NO
YES
IS LED D26 OFF
(MUTE OFF)?
REPAIR FAULTY
CO-AX CABLE CONNECTIONS
NO
YES
INTERCONNECTION
OR MAGNETRON HEATER
OPEN CIRCUIT
SET TO STANDBY BY
SWITCHING OFF GEARBOX
SAFETY SWITCH
IS PSU +9.5V LED ON?
NO
YES
INTERCONNECTION
OR MAGNETRON HEATER
SHORT CIRCUIT
PSU FAULT
ARE CO-AX CABLE
CONNECTIONS OK?
NO
YES
REPAIR FAULTY CO-AX
CABLE CONNECTION(S)
REPAIR CONNECTIONS
RECEIVER FAULT
CHECK CONTROL
BOARD LEDs
NO
YES
IS PSU +27V LED ON?
IS PSU SWITCHED ON?
SWITCH TO STANDBY BY
SWITCHING OFF
GEARBOX SAFETY SWITCH,
THE AE WILL STOP
TURN AE AWAY FROM YOU.
SWITCH CONTROL BOARD S1
OFF (AE TURNING INHIBIT).
SET CONTROL BOARD LK8
(CCT REF E6) TO TEST.
SET TO RUN.
SAFETY SWITCH ON
IS
MODULATOR FIRING?
(CONTINUOUS AUDIBLE
NOTE, 800MHz)
NO
YES
INTERMITTENT NOTE?
MODULATOR FAULT
YES
NO
AT RUN,
IS -350V AT PSU PLC-2,
WRT TO CHASSIS OK?
CABLEFORM MODULATOR
OR CONTROL BOARD FAULT
NO
YES
IS PSU
PLB-10 AT LEAST +10V
WRT CHASSIS?
NO
YES
CONTROL BOARD FAULT
IS PSU
PLB-9 AT LEAST 1V
WRT CHASSIS?
NO
YES
PSU FAULT
PSU FAULT
OR CONTROL BOARD FAULT
OR MODULATOR FAULT
IS THERE
A MODULATOR
PLC CONNECTOR OR
CONNECTON FAULT TO
CONNECTOR?
NO
YES
REPAIR FAULT
TO FIGURE 4
ARE CO-AX CABLE
CONNECTIONS OK?
REMOVE PSU PLC
PSU FAULT
NO
YES
SET SWITCH S1 TO ON
HL OVERRIDE FAULT
SET LK8 (CCT REF E6)
TO TEST
REMOVE CONTROL
BOARD SKF
MUTE INPUT FROM
Rx MON PCB
IS LED D26 OFF
(MUTE OFF)?
NO
YES
CONTROL BOARD FAULT
Rx MON PCB FAULT OR
CABLEFORM FAULT
IS LED D26 OFF
(MUTE OFF)?
CABLE FAULT
NO
YES
Figure 12c - Flowchart 3
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
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