TM11-6130-381-14
resistors R6103 and R6104. This is applied to
applied to potentiometer R6154, differential
terminal 3 of amplifier A6101 through the filter,
comparator A6104 controls the operation of Q6109
which consists of resistor R6105 and capacitor
and relay K6103, and relay K6103 controls the
application of the battery B clipped sine wave
C6105. The positive terminal of battery A is
connected to potentiometer R6109 through pin 5 of
power supply to UJT multivibrator Q1607 of the
J6001. Resistors R6108, R6109, and R6110 form a
battery B charging current control circuit.
e. Input Frequency Compensating Circuit. A
voltage divider network that supplies a portion of
frequency detecting circuit, which controls the
the battery voltage to the wiper arm of poten-
operation of relay K6102, automatically adjusts the
tiometer R6109. This voltage is filtered by resistor
R6111 and capacitor C6131 and applied to terminal
time constants in the UJT emitter circuits of both
charging current control circuits for 60 Hz input
4 of amplifier A6101. Potentiometer R6109 is set
power frequency. The time constants of the UJT
so that the sensing circuitry will detect when the
circuits are preset for 400 Hz operation. The
battery is charged to 8.1 . 1 volts. When the
resistor-capacitor (rc) network, R6130 and C6117
voltage picked off by R6109 exceeds the reference
a n d transistor Q6102, f o r m s the frequency
voltage at R6104 (indicating that the battery
detecting circuit. When the input line frequency is
voltage has reached its fully charged state), the
400 Hz, the voltage output of the rc network is not
output of differential comparator A6101 (pin 7)
becomes positive, and causes transistor Q6101 to
great enough to exceed the threshold voltage of the
base-emitter circuit of Q6102 in series with diode
conduct. Capacitor C6133 and resistor R6106 filter
the voltage applied to transistor Q6101 to prevent
CR6117. Transistor Q6102 does not conduct. The
transient voltage from triggering Q6101. Capacitor
coil of relay K6102 is connected in the collector
C6101 filters transient voltages from Q6101 when
circuit of Q6102. When the input line frequency is
relay K6101 contacts are switched. The latching
60 Hz, the voltage output of the rc network ex-
coil of relay K6101 is connected in the collector
ceeds the threshold voltage and Q6102 conduts.
The detected current is amplified in the collector
circuit of Q6101 so that, when current flows in
Q6101, the latching coil is energized. When relay
circuit of Q6102 and energizes relay K6102.
K6101 is energized, the sine wave power supply to
Capacitor C6132 filters and smooths the current
UJT multivibrator Q6104 is interrupted (terminals
through the relay coil. When relay K6102 is
energized, relay K6102 contacts place capacitor --
3 and 5 of K6101 ). This prevents the multivibrator
circuit from producing an output to turn on gates
C6115 in parallel with C6114 (battery A control
of Q6001 and Q6002 in the battery charging
circuit) and capacitor C6122 in parallel with C6121
voltage circuit. This action removes the charging
(battery B control circuit). This added capacitance
voltage from battery A; when the gates are shut
adjusts t h e t i m e c o n s t a n t s i n t h e U J T
off, no rectification for battery charging takes
multivibrator emitter circuits for 60 Hz operation.
f. Output Filtering Circuit. Electromagnetic
place. A second set of contacts of relay K6101
controls the operation of the battery A CHARGE
interference filters are provided at the channel A
and channel B output connectors J6001 and J6002,
ON and OFF indicator lights, When relay K6101
is energized, the ac voltage at terminal 6 of relay
respectively. Filters FL6003, FL6004, FL6007, and
K6101 is disconnected from the CHARGE ON
FL6008 filter the channel A change and sense
indicator light and applied to the CHARGE OFF
circuits while filters FL6005, FL6006, FL6009, and
FL6010 similarly filter the channel B circuits.
indicator light. RESET (A) switch S6003 controls
the resetting of relay K6101 once it is energized by
4-3 Adapter Circuitry
the sensing of a fully charged battery. When the
a. Mounted in the cover of the battery charger
RESET (A) switch is momentarily held in its down
case is a 230 vac conversion assembly which is
position, the reset coil of relay K6101 is energized,
basically an adapter. This assembly provides a
the relay K6101 is reset so that the clipped sine
female mating connector J6301 for the three-prong
wave power supply is again connected to the UJT
male power plug P6001 and is wired to binding
multivibrator circuit. This condition brings the
posts E6301, E6302, and E6303 (fig. 4-5 and
battery charging currrent control circuit back into
operation. At the same time, the CHARGE OFF
battery charger to any source of 115- or 230-voIt ac
indicator light extinguishes, and the CHARGE
power requiring binding post connections.
ON indicator light illuminates. Operation of the
b. The 230 vac conversion assembly serves as
charging voltage-sensing and cutoff circuit for
the power cable storage spool and power plug
battery B is the same as for battery A. The
storage receptacle whenever the battery charger is
battery B current has its own power supply circuit,
not in use.
which consists of CR6120 through CR6123 and
associated circuitry. The battery B voltage is
4-6
