Head Load Solenoid And Bail; Service Check - IBM 5114 Maintenance Information Manual

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130
HEAD LOAD SOLENOID AND BAIL
(Page 1 of 3)
Service Check
1.
2.
Prepare for the service check as follows:
a. Turn off the I PO switch.
b. Remove the 5114covers (110).
c. Remove the diskette drive assembly (111).
(Disconnect the drive motor power cable but
leave the signal cable connected.)
d. Remove diskette adapter card A1Cl (103).
e. Remove the diskette drive cover (112).
DANGER
Voltage is present at the socket when the
power cable is disconnected and the I PO
switch is on.
f. Turn on the IPO switch. Verify that system
power is turned on.
Check the bail and carriage arm gap as follows:
a. Insert a clean strip of paper between the
read / write heads
II.
b. Check for tension on the head load spring.
Solenoid
Plunger
I c.-:i
_....-............ -+-+
F=I
~
Lc~t;-l-lb:!lLI
0+--. Ba i I Assembly
R/W Heads
150.4 ± 0.13
mm)
II
0.015 ± 0.005 inch
CAUTION
The PTX, LED, or drive card can be damaged if
the incorrect test pins are jumped.
c. Install a jumper from
0
(-head load) to •
(ground) to activate the head load solenoid.
DANGER
The solenoid case becomes hot after
continuous use.
Diskette Control Card
3.
14
\00 0 0 0 0 0 0 0 0 0 0 0 0
I
HCP
TPB-l0
TPA-6
00 0 0
000
oT7~
16
o
00
1400 0
8528195
or
4178068 TPA-l
16
o
D
000 00
14000 0
d. Verify a 0.015
±
0.005 inch (0.4
±
0.13 mm) gap
II
between the bail and the carriage arm tab for
full length of carriage travel (tracks 00 to 76).
e. If the gap is correct, go to step 3. If the gap is
not correct, go to step 1 of the adjustment
procedure.
Check the gap between the head surfaces as
follows:
a. Remove the jumper.
b. Remove the strip of paper from between the
read/write heads.
c. Visually check for a gap of approximately
1/8
inch (about 3 mm) between the head surfaces
II .
(This gap cannot be measured.)
d. If the gap is correct, go to step 4. If the gap is
not correct, go to step 2 of the adjustment
procedure.
Covers and Diskette Drive 2-25