Radio Shack TRS-80 III User Manual

TRACK 00 ALIGNMENT
Track 00 Switch Adjustment
1. Connect Scope:
Channel A to
pin 1 of Plug 11
Vert. to 2 volts/div.
Time
Base to 10msec.
Trigger internal channel
A, DC coupled
2. Step between tracks
02 and 03.
3. Loosen track 00 switch mounting screw and adjust
until switch activates between tracks
02 and 03.
Tighten mounting screw.
Track
G0 Stop Adjustment
1. Connect scope
as in Head Radial alignment.
2. Insert alignment diskette and read track
00.
3. Back off the track GG stop screw two turns. Slow-
ly turn the track ctlctl stop screw in until the output
amplitude shown on the scope starts to decrease.
Back the track ctlctl stop screw out until the ampli-
tude stops increasing.
Back the track ctlctl stop screw
out one-half turn from this point.
FIGURE 13. TRACK 00 STOP ADJUSTMENT
INDEX SECTOR ADJUSTMENT
1. Set Scope:
Vert. at
0.2 volts/div
Time
Base 5ctlJ1sec/div
2. Insert alignment diskette and read track ctl1 . Scope
display should show
ctl volts AC trace for 2(3ctlJ1sec
±. 5ctlJ1sec. If waveform is outside of spec., loosen
the index sector light mounting screw and adjust
to spec.
3. Open and close the Drive door and re-verify the
index sector timing.
j
J
j
j j
\
~~
U\'l
n
!\f
V V
Y
V
YY
TIME SCALE = 50j.lsec/DIV
FIGURE 14. INDEX SECTOR TIMING
SENSOR RETAINING SCREW
ADJUSTMENT
110
FIGURE 15. INDEX ADJUSTMENT

Radio Shack TRS-80 III Specifications

General

Brand	Radio Shack
Model	TRS-80 III
Category	Desktop
Language	English