IBM 5110 Series Maintenance Analysis Procedures page 44

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9
TAPE READ MAP
PAGE 20 OF 45
197
-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 B 12 (-forward magnet drive) and
tape control card pin U08 (gnd) (see MIM 230).
- Remove the jumper.
Did the tape move counterclockwise
(forward)?
Y N
198
-Calibrate the multimeter (see MIM 270).
- Measure +12 Vdc between tape control card
pin B 13 (+12 Vdc) and tape control card pin
U08 (gnd).
Is the voltage in tolerance (+11.0 Vdc to
+13.2 Vdc)?
Y N
199
Go to Page
36.
Step
423.
Entry Point C.
200
-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 B12 and B13 .
Is the resistance 25 to 40 ohms?
Y N
DOD
W X
y
o
0 DOD
~
9
w
X y
MAP 0300-20
8 8
201
Bad select magnet (forward) (see
MIM 203).
Check/ replace the tape internal cable
(see MAP 0210 and MIM 203).
202
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).
203
Bad tape control card (see MIM 203).
204
Check/ adjust the cartridge stop blocks (see
MIM 223).
Check/adjust the locking wheels (see MIM
222).
Bad spindle-select arm assembly (see MIM
203).
Bad diagnostic tape cartridge.
205
-If you do not remember the answer to the next
question, press R and then C to try the test
again.
Did the tape motion last about 2 seconds?
Y N
2
1
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Z
206
Bad brake arm or brake arm spring (see MIM
203).
Bad H2 (base I/O) card.
01JAN79
EC 836600 PEC 835541
MAP 0300-20
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