Commodore 1515 Technical Manual page 42

6. No printing or poor print quality
START
Proper position
of print head
unit?
NO
l - - - -
Set paper.
\ - - - - Reset it.
Adjust ribbon feed
)--_ _ board or replace
ribbon cam or
carrier unit.
> - - - -
Replace it.
7. The upper or lower dots of
printed characters are missing.
START
Proper position
of dot sensor
unit?
YES
NO Ad' . .
f'
JUst position
0
it.
Flexible cable
properly inserted
into head connector?
YES
Correct position
and proper contact
between pin connector
and head board lead
wire?
YES
>-----Replace print
head unit.
NO
Proper voltage Repair
on pin connector? PCB unit.
" \--_ _
~--.J-
. . . ,
,(17 - 20 VDC )
YES isOK
Proper voltage NO Replace print
on head connector? head unit.
"
'----~~Y:-=E':"S---' ........ , ... ( 17 - 20 VDC )
isOK
YES Replace print
head unit.
Repair
PCB
unit.
Proper position
between ridges of
platen and
rotation detector?
After removing gear pin from rotation
NO detector and adjusting coupling
position of reduction gear, adjust
position of dot sensor unit.
YES
Replace print
head unit.