Hitachi TM 1081 ZB Service Manual
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Extracted text from Hitachi TM 1081 ZB Service Manual (Ocr-read)
Page 1
HITACHI
Hitachi, Ltd. Tokyo Japan
All. TRANSISTOR CAR RADIO
MODEL TM-IO8IZB
SERVICE MANUAL
N0. 3 0 8 1 9 7 (I
SPECIFICATIONS
CIRCUIT SYSTEM ---------------- All transistor superheterodyne D 5 1N34A ------------------------ Motor Noise Limiter
with RF automatic tuning THERMISTORS
system $3; $3 3;} ------------------------ Temperature Compensator
TUNING RANGE --------------------- 530~1,605KH2 L0
........................ 1
INTERMEDIATE FREQUENCYu-ALSSKHZ UDSPEAKLR 54 RM" 4 Ohms
TRANSISTORS A3310 OSUTPUT """""""""""" 4W
1: ....................... t'
TRI 25C 460- ~~~RF Amp. ER UPPLY DC 12V, Nega Ive
TRZ 25C 454 anverter
TR3 25c 454. IF Amp.
TR4 25c 454 ........................ Trigger Amp.
TR5 25C 458 ------------------------ Trigger Detector
TR6 28C 458 ~~~~~~~~~~~~~~~~~~~~~~~ Relay Driver
ggggggggg} ..................... Power Amp.
1C1 FA6007T ..................... AF Amp.
DIODES
D 1 INGO ........................... AGC
D 2 1N60 ........................... AGC
D3 1N60 ........................... Detector
D4 INGO --------------------------- Transistor Protector
grounded battery
lOOmA (with no signal)
700mA (at max. output)
CURRENT CONSUMPTION--
ANTENNA ------------------------------ Power antenna for car use
SENSITIVITY ............................ 10 dB (max.)
25 dB (practical)
STOP SENSITIVITY ------------------ 23 dB (Dx.)
52 dB (local)
DIMENSIONSI ...................... 2%(H) X 9 5/(6 (W)
X 5% (D)
(5.5 X 16 ><15cm)
WEIGHT ................................... 4 lbs. 5 UL
ACCESSORIES
Speaker (5% P.M., 4 ohms)
Power antenna (R0448)
Antenna Connecting cord
Set screws
Page 2
MODEL TM-IOS'IZB SERVICE MANUAL
CONTROLS
DX- LOCAL PILOT LAMP TONE ANTENNA
CONTROL (GREEN) CONTROL SWITCH
ANTENNA
TRIMMER
SPEAKER & POWER LAMP
AUTO TUNTNG SWITCH & TUNING ON-OFF SWITCH &
MANUAL TUNTNG CONTROL BUTTONS VOLUME CONTROL
Fig. 1 Fig. 2
BLOCK DIAGRAM
F
CORD CONNECTOR TERMINAL H0
TELESCOPIC
ANTENNA (ox 0N )
LOCAL OFF
RF Amp. Conv IF Amp. PowerAmT;
MOTOR 230460 250454 zsc454 zsaaam
(POWER TR! TR2 TR 3 TR7 a
ANTENNA) J '
l ___,,
T ! AGC AGC 5+
. T
IZV Y Y 406.0 INeo
.-I-l I
1 1
LLEJLJ MOTOR
LAMP
Relay Drive Trig. Der. Trig . Amp,
Relay 250453 250453 zsc454
TR6 TR5 TR4
UP '-0 o-Joown
AUTO-TUNING BLOCK
Fig 3
ANTENNA
J ACK
LAMP SW