Proteksi 1 : Pin20 IC601, X-ray protector, normal 0V, R428 (56K) sensor output vertikal, D522 sensor heater/x-ray, Q503 sensor ABL/X-ray, Q451 sensor sekunder TFB/X-ray.
Proteksi 2 : Q1136 detektor sinkronisasi video dari pin12 IC601 menuju ke pin50 IC 1102 (MN1528110TT).
Proteksi 3 : pin55 IC601, X-ray protector, normal 0V, R426 sensor vertikal output, Q451 (A1015) sensor tegangan 24V dan 12V.
Proteksi 1 : Pin7 IC801, AC-detector, nilai normal tergantung setting 3V+ atau 0V, default 3V+, D1002 zener 12V dari output 15V sekunder smps.
Proteksi 2 : Pin63 IC801, protek utama, normal 3V+, D1005 sensor 16V, D204 sensor 5V, D203 sensor 33V, D605 sensor 180V, D608 sensor X-ray/ABL, Q603 sensor heater/X-ray.
Proteksi 1 : pin64 IC801, AC-detector, nilai normal tergantung setting 3V+ atau 0V, default 3V+, D1002 zener 12V dari output 15V sekunder smps.
Proteksi 2 : Pin63 IC801, protek utama, normal 3V+, D1008 sensor 5VA, D1005 sensor 5VB, D203 sensor 30V, D605 sensor 180V, D604 sensor heater/X-ray, D608 sensor ABL, Q603 sensor heater/X-ray.
Varian : 21EF250MK2
Proteksi 1 : pin6 IC1001, AC-Detector, nilai normal tergantung setting (ADC), D1010 sensor 16V sekunder smps.
Proteksi 2 : pin7 IC1001, protek utama, nilai normal 4V6, D605 sensor 180V, D608, Q603 sensor heater/X-ray, D203 sensor 33V, D1091 sensor 9VB.
Proteksi : pin8 IC801, protek utama, normal 3V2, D609 sensor 8VB, D606 sensor ABL/X-ray, D614, Q603 sensor heater/X-ray, D613 sensor 180V, D752 sensor 5VB, D504 sensor 16VB audio, D502, D503 sensor vertikal.
Varian : 51U200