Trouble·shooting - Raytheon Pathfinder 1200 Instruction Manual

TABLE 5.4 TROUBLE SHOOTING GUIDE
Trouble Remedy
1. Does not start at
OPERA TE switch
to STBY.
"
2. Ready lamp not
glowing.
3. Scanner fails to
rotate.
4. Scanner rotates
but rotation of
sweep is
abnormal
5. No picture on the
screen.
6. Only horizontal
line screen.
7. Incorrect sweep
o Start of sweep
is not centered
on the screen.
o Markers are
oval.
5-8
Check:
o Blown fuse F401.
o Check input power circuits.
o Fault of contact on S401.
o Fault of TRSO1, 502, 503.
o Fault of AVR cct on PCSO 1.
o Fault of contact on connecter of PCSO 1.
o Fault of rectifier diodes on PCSO 1.
Check:
o AVR Inop.
o Fault of CD40 1.
o Fault of timer cct on PC401.
Check:
o Fault of S101. (Safety Switch OFF)
o Fault of contact on terminal boards.
o Fault of BIOI (Commutator and blush).
o Fault of drive mechanism.
Rotation of MlOl and fault of connection between
MIOI (PG) and PC401.
Check:
o Fault of connection between M10 1 (PG) and PC40I.
o Fault of MIOI.
o Fault of cct on PC401.
Fault of CRT display unit or its supply voltages.
Check:
o Open heater of CRT.
o Fault of contact on CRT socket.
o Fault of contact on CRT cap.
o Fault of video cct on PC401.
(Fault of RV4)
o Fault of timer cct on PC401
There may be fault in vertical sweep generator, amplifier
circuits and deflection coil.
Check:
o Fault in vertical sweep generator, amplifier cct (circuit).
o Adjust MT401
o Adjust horizontal or vergical hold.
o Adjust vertical length and linearity.