Troubleshooting Chart - Commodore VIC-20 User Manual

TROUBLESHOOTING CHART
SYMPTOM
CAUSE
REMEDY
NO PICTURE VIC not "o
(POWER LIGHT OFF)
Make sure power switch
is in Mon" position
VIC not plugged in
Check power socket
next to power switch
Power supply not
plugged tn
Check connection with
wall outlet
Bad fuse in VIC Take VIC to your
Authorized Commodore
Service Center for
replacement of fuse*
NO PICTURE
(POWER LIGHT ON) (Try turning VIC off far a few secondsh then back on)
TV on wrong channel Check Channel 3 & 4 for
picture
Incorrect hookup
VIC hooks up to "VHF"
terminals on TV
Modulator not plugged
in
Check connection at
5-pin Video Port
Modulator on wrong
channel
Flip switch on Modulator
Video cable not
connected
Check connection on
modulator
PICTURE WITHOUT
COLOR |THY TV &
MODULATOR ON
CHANNEL 3 S 4)
Poorly tuned TV RetuneTV
PICTURE WITH Bad color adjustment on Adjust color/hue/
POOR COLOR TV (see "picture without brightness controls on
color") TV
PICTURE WITH TV volume jp too high
EXCESS (see "picture without
BACKGROUND NOJSE color")
Adjust volume of TV
PICTURE OK,
BUT NO SOUND
TV volume too low
Adjust volume of TV
'The VIC uses a 3 amp SLO-BLO fuse.
VII