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3. Important safety tests
Measuring H.V.
The anode caps are cemented to the CRTs. To gain access for high voltage measurement, remove the
red CRT's anode lead from the flyback transformer distributor. Grasp the anode lead protective cap at
its bottom and squeeze it against thelocking cap body inside, rotate 1/4 turn counter clockwise and
pull the anode lead sleeve out of the FBT distributor. Connect a high voltage positive lead from your
H.V. meter to the FBT distributor, and the common negative lead to cold ground
FBT leads removal
Note:
Reinsert the anode lead into the FBT distributor until it is tightly and fully seated. Turn the locking cap
clockwise to lock in place.
(EHT) Protector operation check
With the cabinet back removed, apply a nominal 120V A.C. to the PTV.
Over voltage test
Preparation:
1. Turn PTV "OFF"
2. Connect a NTSC signal generator to the antenna terminal.
3. Connect DVM positive lead to D31 pin 2 and negative lead to D31 pin 1
on D-Board
H.V. measurement
4. Connect a H.V. meter (static type, class 0.1) with high voltage leads to
5
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