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7942 and 7946
AS-2. PREPARATION FOR
SERVICE
Note: Numbers in parentheses refer to the
index numbers in table A6-1 and
figure A6-1.
Before starting any removal or replacement proce-
dure, prepare the disc/tape drive for service as fol-
lows:
a. Set the drive LINE- switch to the
0
(out) posi-
tion and disconnect the power cord from the
- AC LINE connector.
b. Disconnect the HP-IB cable from the drive HP-
IB connector.
c. Place the drive on the antistatic pad and connect
the wrist strap to the pad. When top shroud is
removed
(paragraph
AS-4),
ground
the
mainframe (51) of the drive to the pad.
I
CAUTION
I
Ensure that the antistatic wrist
strap is attached to the wrist before
removing or replacing components
in the drive.
AS-3. REMOVAL AND
REPLACEMENT
Removal and replacement instructions for field
replaceable. assemblies (FRA's) and parts in the
drive are provided in the following paragraphs.
Unless otherwise specified, replacement is a rever-
sal of the removal instructions.
A5-4. TOP SHROUD
Note: When replacing the top shroud on
disc/tape drives with serial number
prefix 2519 and below, it is man-
da tory that the f ron t panel also be
replaced.
To remove the top shroud
(1),
proceed as follows:
a. Perform the preparation for service procedure
outlined in paragraph AS-2.
b~
Ensure that the power cord is disconnected from
the - AC LINE connector on the rear panel of
the drive.
c. Remove the five T 10 screws (2) which secure the
top shroud to the mainframe (51).
d. Carefully slide the top shroud
(1)
toward the
rear of the drive. When the shroud is clear of
the mainframe (51), remove it from the drive.
e. Ground the mainframe to the antistatic pad
before removing any FRAs from the drive.
Reinstallation is a reversal of the removal proce-
dure.
AS-S. EPROM KITS
To remove the EPROM kits (3, 4, 5,), proceed as
follows:
a. Perform the preparation for service procedure
outlined in paragraph AS-2. Pay particular at-
tention to the instructions given for use of the
antistatic pad and wrist strap.
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
AS-4).
d. Remove the single EXEC EPROM (3) from the
28-pin socket U101 on HDC FRA5 (6). See
figure 4 - 8 for the location of V 1 0 1. Place the
EPROM on a piece of antistatic foam.
d. Remove the two DISC EPROM's (4) from 28-pin
sockets V131 and Vl61 on HDC FRA5 (6). See
figure 4- 8. Place the EPROM's on a piece of an-
tistatic foam.
e. Remove the two TAPE EPROM's (5) from
28 -pin sockets U 1 21 and U 1 51 on HDC FRA 5
(6). See figure 4- 8. Place the EPROM's on a
piece of antistatic foam.
Reinstallation is a reversal of the removal proce-
dure. The EXEC EPROM is labeled VIOl, the
DISC EPROM's are labeled VI 3 1 and V 161, and
the TAPE EPROM's are labeled U 1 21 and U 1 5 1.
Ensure that the EPROM's are installed in their
matching 28-pin sockets on HDC FRA5
(6),
AS-2
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