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Table 5-4. Battery
Power Checks
step
1
2
3
4
5
Item/Component
S102 LINE/BAT
Switch
PI007
Line Cord
F301
5A
BT301 Batteries
Each battery
cell
1.5-3V
for any cell.
voltage
during charging.
0301 Anode
Full wave rectified
voltage,
15 VDC
nominal.
c304
+
+ 17.5V minimum.
PI004
pin 8 or U301
12A
13
14
15
0307 and 0308
Base
Q307, Q308 Collector
Required
Condition
Check AC line power per Table 5-3.
Turn off power.
Move to BAT.
Plugged
into live receptacle.
Remove fuse and connect
ammeter
to fuse clip 0 to 500mA
charging
rate, varies with line voltage
and battery
state of charge.
Full charge is =9.8V
over 4 cells.
R301 adjusts charging
rata (float
voltage)
Should
saturate
only when battery
approaches
full charge.
8.2V zenar.
Unplug
line cord Et turn power on.
IOOkHz 5V square wave.
+ 7V minimum
Square wave,
f0.7V
at 25kHz.
Must oscillate from saturation
to
twice battery
voltage
(= 19V) at 25kHz
f 17.5V minimum
( *25V
typical
with
fully charged
bat.)
Remarks
Charge circuit checks.
No charge,
see step
5A. Correct charging
but
short battery
operating
time, see step 6.
If voltage
is low and adjusts
ment of R301 does not
start charging,
see steps 7
and
following.
If voltage
is
low and adjustment
of
R301 does start charging,
see Table 5-l 1 for adjust-
ment of battery
charge
voltage.
High voltage
or zero indi-
cates damaged
cell.
Output
of CR103
Output
of CR104. Triggers
Q301 gate thru R306 and
CR301 unless Q302 is on.
Discharge
checks.
Clock input.
If no input,
see step 12A.
Battery
voltage
input to
VRlOl.
Output
of u301,
-4
lnverier
lnverter
Output,
input to
VRIOZ and VR103
57
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