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ViewSonic Corporation E90fB-4
22
Confidential-Do Not Copy
6-6 ABNORMAL VERTICAL SCANNING
6-6-1. ABNORMAL VERTICAL SIZE
OK
NG
OK
NG
READJUST V-SIZE FUNCTION VALUE
RELATIVE CIRCUIT
CHECK VERT. OSC CIRCUIT
RELATIVE CIRCUIT
NG
READJUST V-SIZE FUNCTION VALUE
CHECK THE VOLTAGE OF IC101
RELATIVE CIRCUIT
CHECK IC101 PIN33,34
CHECK THE IC601 PIN1 ABOUT 11.8V
PIN 4 ABOUT -12V
CHECK D601, C605
6-6-2. VERTICAL CENTER
NG
READJUST V-CENTER
RELATIVE CKT
CHECK IC101 AND IC601
6-7 . SIDE-PIN CUSHION DISTORTION
NG
READJUST
CHECK IC101, Q406
RELATIVE CKT.
6-8 . POOR FOCUS
READJUST FOCUS CONTROL
NG
CHECK FOCUS CONTROL UNIT,
FOCUS LEAD WIRE, CRT SOCKET & CRT
Summary of Contents for PerfectFlat E90fB-4
Page 46: ...ViewSonic Corporation E90fB 4 43 Confidential Do Not Copy 9 BLOCK DIAGRAM...
Page 48: ...ViewSonic Corporation E90fB 4 45 Confidential Do Not Copy SAA4849...
Page 52: ...ViewSonic Corporation E90fB 4 49 Confidential Do Not Copy...
Page 58: ...ViewSonic Corporation E90fB 4 55 Confidential Do Not Copy 11 PCB LAYOUT 11 1 MAIN PCB LAYOUT...
Page 59: ...ViewSonic Corporation E90fB 4 56 Confidential Do Not Copy 11 2 CRT BOARD LAYOUT...