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PLl
The
PLLl
Phase Lock Loop is unlocked. Items to check are:
n
AlOAl
-
Check signal out at
AlOAlJ3.
n AlOA2
-
Check signal in at AlOA2J2.
n
A10A3
-
Check signal out at AlOA3J3.
n AlOA4
-
Check signal out at AlOA4J2 and in at AlOA4J4.
PLL2
The PLL2 Phase Lock Loop is unlocked. Items to check are:
n AlOA5
-
Check signal out at AlOA5J3.
n AlOA6
-
Check
4
Det Out voltage at
AlOA6TP7.
n AlOA7
-
Check 500 kHz Reference at
AlOA7TP5
and divided output at
AlOA7TPl.
n AlOA8
-
Check VCO Tune output current at AlOA8J2.
REF UNLOCK
The 10 MHz Reference Loop is unlocked. Items to check are:
n OVEN COLD indicator on. This is normal operation.
n Cable W15 connected to rear-panel FREQ REFERENCE IN and OUT connectors.
w
Rear-Panel FREQ REFERENCE EXT/INT switch in proper position.
n
A7Al
and A7A2
-
Check 10 MHz out at
A7AlJ4.
YTO UNLOCK
The YTO Phase Lock Loop is unlocked. Items to check are:
1
A19
D/AConverter
n A20 Main Coil Driver
n A21 FM Coil Driver
n All YTO Loop
n Al6 Scan Generator
M/N UNLOCK
The M/N Phase Lock Loop is unlocked. Items to check are:
n A7A3
-
Check output at
A7A3Jl.
n A7A4
-
Check output at
A7A4Jl.
Overall Troubleshooting 5