Poor Focus - Mitsubishi Diamond Plus 93SB Service Manual

7. POOR FOCUS

POOR FOCUS
CHECK
T302 3PIN H-DYNAMIC
PARBOLA WAVEFORM 500Vp-p
V-DYNAMIC PARABOLA
WAVEFORM 150Vp-p
CHECK
T302 H AND V
PARABOLA
WAVEFORM
H-PARABOLA
CHECK
U501 32 PIN
V-PARABOLA WAVE
0.47Vp-p
CHECK
U501 32 PIN
V-PARABOLA WAVE
0.47Vp-p
YES
NO
NO
NO
YES
T301 STATIC FOCUS VR AND
YES
DYNAMIC FOCUS VR
1. CHECK STATIC FOCUS AND DYNAMIC
FOCUS VR LINE TO CRT SOCKET.
2. CRT SOCKET OR CRT POOR.
NO
H-PARABOLA
T302, C325, R341, T301
YES
Q312, C343, R356, R330
NO
6-9
ADJUST
NO
TROUBLE IN
TROUBLE IN
ADJUST V-FOUCS
OUTPUT 50 ~ 60%.