Abnormal Vertical Scanning; Side-Pin Cushion Distortion; Poor Focus - HP D8904 Service Manual

1. ABNORMAL VERTICAL SIZE
READJUST V-SIZE FUNCTION VALUE
CHECK THE IC601 PIN 2 ABOUT 11.8V
PIN 4 ABOUT -12V
OK
CHECK VERT. OSC CIRCUIT
OK
READJUST V-SIZE FUNCTION VALUE
2. VERTICAL CENTER
READJUST V-CENTER
READJUST SIDEPIN

6-6 ABNORMAL VERTICAL SCANNING

NG
NG
NG
NG
CHECK IC401 AND IC601
RELATIVE CKT

6-7 SIDE-PIN CUSHION DISTORTION

NG

6-8 POOR FOCUS

CHECK D601, C605
RELATIVE CIRCUIT
CHECK THE VOLTAGE OF IC101
RELATIVE CIRCUIT
CHECK IC401 PIN 20, 21, 22, 23
RELATIVE CIRCUIT
CHECK IC401, Q404, Q405, Q406
RELATIVE CKT.