Advertisement
1. PARTS LOCATION
AD-360
SPEAKER RIGHT {+)
(GRY/YEL) (Ell)
SHIELD
SPEAKER RIGHT (-)
(GRY/WHT) (E10)
TRANSFORMER (T1)
SPEAKER LEFT ( + )
Q1
Q2
Q3
(GRN/YEL) (E2)
SPEAKER LEFT (-)
uuu
(GRN/WHT) (El)
INPUT LEFT(-)
(BLK) (E4)
INPUT RIGHT (-)
(BLK) (E6)
INPUT LEFT ( + )
(GRN) (E3)
INPUT RIGHT (+)
(GRY) (E5)
AUTO POWER
(RED) (E8)
KM1LM
Q 19 020 021 022
023 024
INPUT POWER
13,8 V
(WHT) (E7)
CHOKE (L6)
CHASSIS GND,
(BLK) (E9)
2. CIRCUIT DESCRIPTION
and the emitter voltage will drop to about 13.1 volts. With Q18
OFF. current will decrease through R49... establishing base
drive for the Power Switch (Oil and Q12). With Oil and Q12
conducting, current is supplied through the temperature
switch (SI) to voltage regulator 06. allowing the regulator to
conduct. Q6 then supplies regulated current to 022, which in
turn enables the DC-to-DC converter. The converter
supplies
+25 and -25 volts for use by the audio power amplifier circuits.
The converter voltages are adjusted by potentiometer R3.
It should be noted that during normal (installed) operation,
the Auto Power output lead (E8) is connected to the
source
unit "red" power lead (with fuse). In this way. the
source unit
receives all its power from the AD-360 and should not be
connected to the battery. Auto Power circuit operation is as
follows; When the source unit is turned ON. it draws
current
through diodes CR11 and CR12 from the amplifier unit battery
supply. The voltage drop across CR11 and CR12 causes the
Auto Power Switch (Q18) to turn OFF... thus notifying the
amplifier that the source unit has been turned ON. When Q18
turns OFF, the converter is enabled as described above. When
the source unit is turned OFF, Q18 turns ON and disables
converter operation. In the OFF condition, the unit requires
about 60 microamperes which is less than an automotive clock
or source memory.
The following is a brief description of the AD-360 Amplifier
and its operation. Reference to the accompanying schematic
diagram will assist in understanding the various circuits
described. Voltages denoted on the schematic and compo
nent connection diagrams assume the amplifier is connected
as follows (without speaker load):
A. Supply Voltage—A supply voltage of 13.8 volts is
con
nected between the "white" power lead (E7) and the
"black" ground lead (E9).
B. Inputs—The "gray" (E5) and "green" (E3) input leads
are
connected to the "black" input ground leads (E4and E6).
C. Outputs—The "gray" (E10 and Ell) and "green" (El and
E2) leads must be open (no load).
□ .The "red" Auto Power lead (E8) should be connected
through a IK ohm, 'A watt resistor to ground. This will
cause the amplifier to turn ON.
1. Auto Power Circuit
Voltage divider CR10, CR18 and R50 serves to bias the Auto
Power Switch (Q18) "ON" until such time as current is drawn
by the Auto Power output (E8). With the IK ohm "test" resistor
connected to ground (see Item D above), 018 will turn "OFF"
,
<
1
Advertisement
