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6. Replacement
of line power fuse F102:
A. Once the top cover
is removed,
FlO2 is accessible
without
removing
any other components.
B. Remove
FIOZ, shown
in Figure 5-l. and replace it with
a l/EA,
25OV.
3AG.
SLO-BLO
fuse
(Keithley
part
number FU-201 for standard
line voltage
units. Optional
line voltage
units with 90.IIOV
and 190.2lOV
ranges,
use a 3/16A,
250V 3AG SLO-BLD
fuse (Keithley
part
number
FU-291.
7. Replacement
of current
fuse FlOl:
A. Lift the calibration
cover,
or battery
pack, off of the
spacers to gain access to the current fuse.
B. Remove
FIOI, shown
in Figure 5-l. and replace it with
a ZA, 25OV, 3AG fuse (Keithley
part number
FU-13).
C. Install calibration
shield or battery
pack on the spacers.
Be sure that the ground
clip, shown
in Figure 5-l.
is
positioned
on the top side of the shield or battery
pack.
8. Reinstall the top cover.
5.9 MODEL
1788 BA-ITERY
PACK
INSTALLATION
WARNING
Disconnect
the line cord
before
removing
the case ccwar.
1. Turn off the power and disconnect
the line cord.
2. Turn the Model 177 bottom
side up and loosen the four
screws in the bottom
cover. These screws are held cap-
tive by rubber O-rings.
3. Hold the top and bottom
covers together
to prevent their
separation
and turn the Model 177 over to normal posi-
tion.
4. Lift off the top cover and the calibration
shield. The four
plastic spacers must remain in place on the upright studs
projecting
through
the main printed circuit
board.
5. Set the BAT/LINE
switch
to the BAT position
shown in
Figure 5-4. Note that the battery
pack will not operate
properly
if this switch
is not in the BAT position.
6. Remove the fuse F301 on the battery
pack.
7. Install the battery
pack in the instrument
so that it rests
on the plastic spacers.
The ground
clip must make con-
tact with the upper side of the batten/
pack plate.
8. Carefully align the battery
pack plug with connector
P1004
on the circuit board. Push the plug firmly onto the connec-
tar until the lip on the plug engages
the lip of the connec-
tar to lock the plug in place.
CAUTION
Make
sure the connector
is aligned
so that
all pins mate properly,
otherwise,
damage
to the Modal
177 and battery
pack will
result.
9. Install the fuse F301. Reinstall top cover and secure with
four screws.
10. Charge the battery
pack as described
in paragraph
2.6.
Table 5-3. Line Power Checks
step
Item/Component
1
SIOI Line Switch
2
SIOZ LINE/BAT
Switch
F102 Line Fuse
PI007
Line Cord
8
9
10
11
+ 5V Pad*
VRlOl,
IN CIZO-
22OO~F ( + )
+ 15V Pad*
VR102 IN, C123-
47OpF I+ j
-15V Pad*
VR103 IN, Cl25.
17OpF I-)
<On in
ain printed
circuit
board (St
**On optional
line voltage
units se
Required Condition
Must be set to 105.125V
or 210.
250V as appropriate.**
Must be set to BAT for use with
batten/
pack.
Continuity
Plugged
into live receptacle.
Turn on power.
+5v
*5%
+ 7V minimum.
+15v
*lo%
+ 17.5V minimum.
-15v flO%
-17.5V minimum.
Remarks
Output
of VRlOl.
Output
of CR103,
input to VRlOl.
Output
of VRIOZ,
Output
of CR104,
input to VRIOZ.
Output
of VR103.
Output
of CR104,
input to VR103
NOTE: Hot regulator
may indicate
shorted
load.
?a Figure 5-l).
t to 90-I IOV or 180.22OV as appropriate.
5-6
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