Radio Shack TRS-80 Service Manual page 65

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Phenomen
2
3
Condition
"F" Is printed
u
shown
1
below
F F
2
OK
NG
'
1 P" Is shon as shown
I
below.
p
F
2
OK NG
Cause
Location and Method
of Checking
Pen and return spring.
Check by rotating Y-gear idle
back and forth for several
seconds by hand in the pen·
down mode .
Play in entire slider
Check slider and
X-drive
system
Faulty eng;igement of Check gear engagement.
p•per feed gear inside
rvbbtr roller unit after
$llding
~one
tooth.
Substantial pby in
Check for play by moving the
roller bearing. gear venically.
.
Repair Method
Replace rotary holder.
Exchange slider.
Mount properly.
Replace rubber roller unit.
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