ViewSonic PerfectFlat E90fB-4 Service Manual page 25

6-6 ABNORMAL VERTICAL SCANNING
6-6-1. ABNORMAL VERTICAL SIZE
READJUST V-SIZE FUNCTION VALUE
CHECK THE IC601 PIN1 ABOUT 11.8V
PIN 4 ABOUT -12V
OK
CHECK VERT. OSC CIRCUIT
OK
READJUST V-SIZE FUNCTION VALUE
6-6-2. VERTICAL CENTER
READJUST V-CENTER
6-7 . SIDE-PIN CUSHION DISTORTION
READJUST
6-8 . POOR FOCUS
READJUST FOCUS CONTROL
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NG
NG
NG
NG
NG
NG
22
CHECK D601, C605
RELATIVE CIRCUIT
CHECK THE VOLTAGE OF IC101
RELATIVE CIRCUIT
CHECK IC101 PIN33,34
RELATIVE CIRCUIT
CHECK IC101 AND IC601
RELATIVE CKT
CHECK IC101, Q406
RELATIVE CKT.
CHECK FOCUS CONTROL UNIT,
FOCUS LEAD WIRE, CRT SOCKET & CRT
Confidential - Do Not Copy E90fB -4