Head-Disc Assembly A3 - HP 7936 Support Manual

6-20. lVIOTOR Bl
To remove motor (74, figure 9-1), proceed as
follows:
a. Remove the drive belt (55) and motor pulley
(5S) (refer to paragraph 6-16).
b. Remove the 1/2-inch nut (70) which secures the
fan rotor (71) to the motor (74) shaft and
remove the fan rotor (71).
c. Disconnect connector Pion power supply out-
put cable \\/4 (SS) from connector J2 on power
supply PCA-A4 (60).
d. Disconnect connector P5 on power supply out-
put cable W4 (SS) from connector J5 on
primary power PCA-AS (61).
e. Remove the two TI0 screws (72) which secure
the fan scroll (73) to the drive mainframe (90).
f. Being careful not to bend LED PCA-A 7 (46),
pull the LED PCA cable wires out of the cable
clamp attached to the fan scroll (73). Remove
the fan scroll.
g. Disconnect connector BIP2 on the motor (74)
power cable from connector JI/J2 on primary
power PCA··AS (61).
h. Disconnect connector B 1 Pion the motor (74)
brake cable from connector J3 on PCA-AS
(61).
i. Release the spring (91) from the motor (74).
j. Turn the motor (74) on its hinged mounting
bracket until it clears the drive mainframe (90)
and then lift the motor out of the drive.
I
CAUTION
I
Ensure that the motor (74) power con-
nector is plugged into the proper voltage
configuration connector ("JI-115V" for
90-132 Vac; "J2-240V" for IS0-264 Vac)
Removal And Replacement
7936 and 7937
on PCA-AS (60).
CAUTION
When the fan scroll (73) is reinstalled,
ensure that the PCA guide on the scroll
fits between the edge of primary power
PCA-AS (60) and its plastic base plate.
I
CAUTION
I
When the top cover (66) is reinstalled,
make sure that the PCA guide on the
cover fits between the edge of power
supply PCA-A4 (59) and its metal base
plate.
Reinstallation is a reversal of the removal
procedure.
6-21. HEAD-DISC ASSEMBLY A3
To remove head-disc assembly (HDA) A3 (35,
figure 9-1), proceed as follows:
a. Remove the drive belt (55) and pulley (5S)
(refer to paragraph 6-16).
b. Remove the rear panel (22) as described in steps
a through f of the power distribution PCA-A5
removal procedure (refer to paragraph 6-14).
c. Remove the two T9 screws (29) which secure
the cover (25) and shock mount (32) to the
drive mainframe (90).
d.
Remove the Ti5 screw (31) which secures
shock mount (32) to the top of the HDA (35).
e. Remove the shock mount (32) from the drive.
I
CAUTION
I
The head-disc assembly weighs ap-
proximately 34 kg (75 lb). Exercise cau-
tion when removing it from the drive.
6-7