Panasonic NE-2153-2EYG, Service Manual, Page: 18 / 37

18
5 Test Mode
5.1. Component test procedure
5.1.1. High voltage transformer
1. Remove connections from the transformer terminals and
check continuity.
2. Normal (cold) resistance readings should be as follows:
Secondary winding Approx. 80 Ω -120 Ω
Filament winding Approx. 0 Ω
Primary winding Approx. 0 Ω -3 Ω
5.1.2. High voltage capacitor
1. Check continuity of capacitor with meter on highest OHM
scale.
2. A normal capacitor will show continuity for a short time,
and then indicate 9M
Ω
once the capacitor is charged.
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant 9M
Ω
.
5. Resistance between each terminal and chassis should be
infinite.
5.1.3. Magnetron
Continuity checks can only indicate an open filament or a
shorted magnetron. To diagnose for an open filament or
shorted magnetron.
1. Isolate magnetron from the circuit by disconnecting the
leads.
2. A continuity check across magnetron filament terminals
should indicate one ohm or less.
3. A continuity check between each filament terminal and
magnetron case should read open.