Tandy 2000 Service Manual page 472

TABLE
4.2
TROUBLESHOOTING GUIDE
Problem
Possible Cause Recommended
Action
No activity
lamp.
Not
selected.
Lamp not plugged in.
Lamp faulty.
Logic board faulty.
Check
for
correct drive
select
jumper.
Check Connector
P-7
,
Replace
lamp.
Replace
logic board.
No
index.
Not
selected.
Index
sensor
not plugged in.
Index
sensor misadj usted.
Index
sensor
faulty.
Logic board faulty.
Check drive
select
jumper.
Check Connector
P-5
Readjust Index
sensor.
Replace sensor.
Replace
logic board.
No Track
0.
Not
selected.
Track 0
sensor
not plugged in.
Track 0
sensor
misadjusted.
Track 0
sensor
faulty.
Logic board faulty.
Check drive
select
jumper.
Check Connector P-9.
Readj
ust Track 0
sensor.
Replace
Track 0
sensor.
Replace
logic board.
Drive not
ready.
Not
selected.
No
index.
No Track
0.
Motor not up to
speed
or
not turning.
Drive
does
not
seek.
Drive
does
not
restore.
Check drive
select
jumper.
See
"No
index."
See
"No
Track
0.
"
See
'
'Motor not
up
to
speed,
not turning."
See
'
'Drive
does
not
seek
or
rgstore.
t t
4-3