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Removal and Replacement
7942 and 7946
b. Ensure that the power cord is disconnected from
the - AC LINE connector on the rear panel of
the drive.
c. Remove the top shroud (refer to paragraph 5-4)
and the front panel (refer to paragraph 5-7).
d. Disconnect connector PIon ribbon cable assemb-
ly W6 (32) from connector J2 on tape drive
DOC VI-FRA2 (49). (Connector PI can be
reached through the opening in the side of the
mainframe assembly.)
e. Disconnect connectors P3 and P4 on ribbon cable
assembly W3 (36) from connectors 11 and 12,
respectively, on disc drive assembly
VO-
FRA 1
(26).
f. Remove the two T 10 screws (28) which secure
the mounting bracket (29), with tape drive as-
sembly
Vi-FRAI
(31)
attached,
to
the
mainframe assembly (50).
g. Withdraw the mounting bracket (29), with tape
drive assembly
Vi-FRAI
(31) attached, from
the mainframe assembly.
h. Disconnect connector P 8 on power cable assemb-
ly WI (37) from connector 13 on tape drive as-
sembly V I-FRA 1 (31).
i. Remove the four TI0 screws (30) which secure
tape drive assembly Vi-FRAI (31) to the
mounting bracket (29) and remove tape drive
assembly V I-FRA 1 (31).
j.
Disconnect connectors P2, P3 on ribbon cable as-
sembly W 6 (32) from their mating connectors
on tape drive assembly
Vi-FRAI (31).
Note:
Further disassembly of tape drive
assembly
VI -
FRA 1 is described in
the Tape Drive Service Manual,
Section V, Replaceable Parts.
Reinstallation is a reversal of the removal proce-
dure. Ensure that the cable assembly connectors
disconnected in steps d, e, h, and
j
are firmly seated
in their mating connectors.
5-4
5-9. FAN
To remove the fan (23), proceed as follows:
a. Perform the preparation for service procedure
outlined in paragraph 5- 2.
b. Ensure that the power cord is disconnected from
the - AC LINE connector on the rear panel of
the drive.
c. Remove the top shroud (refer to paragraph 5-4),
front panel (refer to paragraph 5-6), and tape
drive assembly (refer to paragraph 5-7).
d. Remove the two 6-32 hex standoffs (7) and lock
washers (8) which secure the HP- IB connector
on HOC FRA5 (6) to the rear panel of the
mainframe assembly (50).
e. Disconnect connector PIon cable assembly W2
(35) from connector J2 on HDC FRA5 (6). Slide
HOC FRA5 (6) forward to provide access to the
fan (23).
f. Remove the Tl 0 screw (34) which secures cover
plate (33) to the rear panel of the mainframe as-
sembly (50).
g. Disconnect connector P2 on cable assembly W2
(35) from connector J2 on disc drive DOC
VO-FRA2 (48).
h. Disconnect connector P 3 on cable assembly W2
(35) from connector 11 in tape drive DOC
VI-fRA2 (49).
i. Release the fan (23) cable from the cable clamps
(54) on the mainframe assembly (50).
j.
Remove the four T 15 screws (24) which secure
grille (25) and fan (23), with captive nuts at-
tached, to the rear panel of the mainframe as-
sembly (50).
k. Release cable assembly W2 (35) from the cable
clamp (54) on mainframe assembly (50).
1. Remove cable assembly W2 (35) from the
mainframe (50) by passing the cable forward
out the front of the mainframe.
m. Turn the fan (23) counterclockwise until its
outer edge clears the top of the tape drive
housing on the mainframe assembly. When the
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