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MODEL
ATR-924
SPECIFICATIONS
GENERAL
DESCRIPTION
Frequency Range:
AM: 530—1605kHz
The
circuitry
used
in this car
radio
incorporates
11
FM:
87—108MHz
transistors, 7 diodes and 1 thermistor.
Intermediate Frequency:
AM: 455kHz FM: 10.7MHz
A external antenna feeds the AM broadcasting signal to
Power Supply:
12V/6V (+) or (—) grounding
the AM RF amplifier and converter.
Power Output:
SW/2.5W
After going through 2 IF amplifiers and 1 diode detector,
Speaker:
6-1/4" Permanent Dynamic
the signal passes through a 4 transistor audio amplifier circuit.
Speaker with speaker box
A external antenna feeds the FM broadcasting signal to
Dimensions:
2"°(H) X 5"(D) X6-1/4"(W)
the FM RF amplifier and mixer.
Weight:
4.0 Ibs.
After going through 3 IF amplifier and 2 diodes detector,
the signal passes through a 4 transistor audio amplifier circuit.
Transistor Complement:
An
AVC
voltage is fed back
to RF
amplifier
and
IF
TR. 1 2SA440
FM RF Amplifier
amplifier.
TR. 2
2SA235
FM Mixer
TR. 3
2SA235
FM Oscillator
TR. 4
2SA355
AMRF Amplifier
|
é
TR. 5 2SA234
AM Converter
CHASSIS REMOVAL
FM Ist IF Amplifier
1. Remove 3 cover retaining screws.
Te
OZone
a ee saeco
2. Remove the cover.
TR.
7
2SA234
noes dIF eee
3. Remove
4 screws located on the printed circuit board.
4. Re
th
t
FM 3rd IF Amplifier
move
the output transformer leads, and tuner lead.
TR. 8
2SB75
AF Amplifier
TR. 9
2SB75
Driver
TR.10, 11 2SB368
Output
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