Drive Belt, Motor Pulley; Power Supply Pca-A4 - HP 7936 Support Manual

support bracket.
d. Pull the line filter away from he rear panel un-
til the two ground terminal mounting screws
are accessible.
e. Remove the two ground terminal mounting
screws and remove the line filter.
WARNING
When reinstalling the line filter assembly
(22), tighten the two ground terminal
mounting :screws securely. This ensures
that a good ground connection is
established.
Reinstallation is a reversal of the removal
procedure.
6-16. DRIVE BELT, MOTOR PULLEY
To remove the drive belt (55, figure 9-1) and
motor pulley (58), proceed as follows:
a. Remove the front panel (refer to paragraph
6-8) and front cover (refer to paragraph 6-9)
from the drive.
b.
Pull the belt cover (54) forward and out of the
drive.
CAUTION
Do not turn the spindle pulley on head-
disc assembly A3 (35) during removal
and replacement of the drive belt.
Failure to observe this precaution could
result in damage to the HDA.
c. Remove the five T9 screws (65) which secure
the top cover (66) to the drive.
d.
Remove
t~~
fan scroll cover clip (67) and fan
scroll cover (79) by loosening the TIO mount-
ing screw (68).
e. Remove the 1/2-inch nut (56) which secures the
Removal And Replacement
7936 and 7937
belt guard (57) and motor pulley (58) to the
motor (74) shaft. Hold the fan rotor (71) to
keep the shaft from turning while removing
the nut.
f. Remove the belt guard (57), drive belt (55), and
motor pulley (58) from the motor (74) shaft.
CAUTION
When the top cover (66) is reinstalled,
make sure that the PCA guide on the
cover fits freely between the edge of
power supply PCA-A4 (60) and its metal
base plate.
Reinstallation is a reversal of the removal
procedure.
NOTE
1. The drive belt should be installed with
its smooth (shiny) side in contact with
the two pulleys.
2. Different drive belts are used for 60
Hz and 50 Hz operation. Ensure that
the proper belt is reinstalled. The belts
are identified by part number as follows:
07937-80033 - 60 Hz
07937-80034 - 50 Hz
3. Different motor pulleys are used for
60 Hz and 50 Hz operation. Ensure that
the proper pulley is reinstalled. The pul-
leys are identified by part number as
follows:
07936-20005 - 60 Hz
07937-20006 - 50 Hz
6-17. POWER SUPPLY PCA-A4
To remove power supply PCA-A4 (60, figure 9-1),
proceed as follows:
a.
Remove the front panel (refer to paragraph
6-5