Hitachi TM 1081 ZB Service Manual

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

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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