![background image](http://html.mh-extra.com/html/nec/fp1350-multisync-22-crt-display/fp1350-multisync-22-crt-display_service-manual_249598123.webp)
7-11
5. ABNORMAL PICTURE
5-1. Horizontal Size
Measure the voltage at CRT anode.
Normally, the voltage is approx. 27KV.
NG
OK
Check the voltage at CNP pin 6 on the VIDEO PWB (PWE-567A).
NG
OK
NG
OK
f H 7
3 3 . 6 k H z
3 6 . 6 k H z
4 1 . 5 k H z
4 5 . 8 k H z
5 2 . 7 k H z
5 7 k H z
6 9 . 5 k H z
8 2 . 6 k H z
1 1 5 k H z
1 0 1 k H z
f H 3
f H 5
f H 1
f H 2
f H 6
4 9 k H z
6 5 . 5 k H z
3 0 . 8 k H z
Fig 5.1.1
CONTINUE
SW REG. failure (see item 13)
Check the voltage which is supplied to CPU
IC801, IC802, IC8G1, IC7A1or their ambient circuit failure
Check the horizontal frequency mode output (IC571 pins 5~7
、
10~12) See Fig. 5.1.1
Check HV voltage
HV circuit failure (see item 6)
Check 8.5V line