Poor Focus - Mitsubishi Electric DPro930SB-BK Service Manual

7. POOR FOCUS

POOR FOCUS
CHECK
T301 12PIN H-DYNAMIC
PARBOLA WAVEFORM 470Vp-p
V-DYNAMIC PARABOLA
WAVEFORM 130Vp-p
CHECK
T302 H AND V
PARABOLA
WAVEFORM
H-PARABOLA
CHECK
U501 PIN 32
V-PARABOLA WAVE
0.55Vp-p
CHECK
FACTORY MODE
V-FOCUS OUTPUT
50~70%
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, D303, D318, T301
YES
Q312, C343, R356, R335,
R331, R332, D307, R337
NO
6-10
ADJUST
NO
TROUBLE IN
TROUBLE IN
ADJUST V-FOUCS
OUTPUT 50 ~ 70%.