IBM 5110 Series Maintenance Analysis Procedures page 41

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TAPE READ MAP
PAGE 17 OF 45
168
-Insert the diagnostic cartridge into the tape
drive.
*************
* CAUTION *
*************
Tape may run off the reel if the jumper is left on
too long.
-Momentarily attach a jumper between tape
control card pin 012 (-reverse magnet drive) and
tape control card pin
uoa
(gnd) (see MIM 230).
- Remove jumper.
Did the tape move clockwise (reverse)?
Y N
169
-Calibrate the multimeter (see MIM 270).
-Measure +12 Vdc between tape control card
pin 013 (+12 Vdc) and tape control card U08
(gnd).
Is the voltage in tolerance
(+11.0
Vdc to
+13.2
Vdc)?
Y N
170
DOD 0
o
F G H
1
MAP 0300-17
6
172
Bad select magnet (reverse) (see MIM
203).
Check/ replace the tape internal cable
(see MAP 0210 and MIM 203).
173
There may be foreign material in the select
magnet gaps (see MIM 203).
Check/ adjust the jackshaft housing (see
MIM 220).
Check/adjust the magnet gaps (see MIM
221).
Bad spindle-select arm assembly (see MIM
203).
174
Bad tape control card (see MIM 203).
175
(Entry Point H)
-If you do not remember the answer to the next
question, press R and then C to try the test
again.
Did the tape reels move counterclockwise
(forward) rather than clockwise (reverse)?
Y N
Go to Page 36, Step 423, Entry Point C. 176
171
-If there is a cartridge in the tape drive,
remove it.
-Remove tape control card (See MIM 203).
- Measure the resistance between tape control
card pin 012 and 013.
Is the resistance 25 to 40 ohms?
Y N
DOD
F G H
-If you do not remember the answer to the
next question, press R and then C to try the
test again.
Did the tape reels move very slowly or
slow down after starting?
Y N
111
888
DOD
J K L
01JAN79
EC 836600 PEC 835541
MAP 0300-17
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