Hitachi T 44 H Service Manual

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@HITACHI

SERVICE MANUAL

No. 412 EGF

T-44H
T-44L

CONTENTS
KEY TO ILLUSTRATIONS ----------- 2
SPECIFICATIONS ------- 2,3
DISASSEMBLV ---------
DIAL CORD STRINGING -
ADJUSTMENTS .................... 3-12
INSPECTION OF MECHANISM 12,13
LUBRICATION ............... I .
BLOCK DAIGRAM ----
EXPLODED VIEW - - H '
PRINTED WIRING BOARD 1931.28.25
CIRCUIT DIAGRAM ---------- 20.22,24,26
REPLACEMENT PARTS LIST
............. 15 _ 18.21 _ 29

INHALT
LEGENDE FOR DIE ABBILDUNGEN

TABLE DES MATIEREs

SIGNATION DES COMMANDES -------- 2
CARACTERISTIOUES TECHNIQUES

TECHlecHE DATEN ..
ZERLEGUNG .........
ANonoNuNG DER SKALENSCMNUR

DEMONTAGE ........................ 6'7
ENROULEMENT DE LA FICELLE DE
on" .............................. -,
REGLAGE ..................
CONTROL: DU MECANISME
GRAISSAGE ................ .
SCHEMA ........................... 14
DARSTELLUNG VUE ECLATEE 15-13
PLAN DE BASE ------------ 1931.23.25
PLAN DE cuncurr ---------- 20.22.2435
TABLEAU nEs PIECE 154321-29

EINSTELLUNGEN ---------------- 8-12
INSPEKTION DES MECHANISMUS
...................... 12'13
SCHMIERUNG ------ 13.14
BLOCK SCHEMA ..................... 14
AUSEINANDERGEZOGENE ------- 15-13
PRINTPLATTEN ---------- 19.21.23.25
SCHALTPLAN ---------- 20.22.24.28
ERSATZTEILISTE -------- 15-18,21- 29

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

AM-FM STEREO DOUBLE CASSETTE RECORDER WITH SEMI-AUTOMATIC TURNTABLE

April 1984 TOYOKAWA WORKS

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HITACHI

T-44H/44L

KEY TO ILLUSTRATIONS

(D Power switch
® Graphic equalizer

CD Dial pointer (Stereo indicator)

(9 Balance control

@ Tuning control

(9 Function selector

® Volume control

® Tape counter/Reset button
© Continuance switch

{9 Record level control

(9 Microphone iacks

® Pause button

® Stop/Eject button

(13 Fast torward button ( DD )

(B Reiwnd button(« )
® Playback button ( p)
6) Record button

69 Power indicator

0} Level indicator

® Cassette holder

(9 Headphones jack
@ Transit screws

Q3 Speed selector lever
@ Stylus cover

® Tonearm

Q3 Arrn rest

0 Arm Iilter lever

{B Rest hook

LEGENDE FUR DIE ABBILDUNGEN

® Netzschalter
® Gralischer Entzerrer
® MW»/LW»Wahlscha|ter

(13 Rijckspultaste ( « )
® Wiedergabetaste ( b)
q) Autnahmetaste

(D Skalenzeiger(Stereoanzeige) ® Netzanzeige

(ED Balanceregler
Abstimmknopt
(D Funktionswahler
Lautstarkeregler

Q3 Pegelanzeige

Q) Kassettenhalter
® Kopthorerbuchse
@ Tonarm

® Bandzahlwerk/Riickstellkncpt ® Drehzahlwahlhebel

® Aulnahmeausteuerung
® Mikrolonbuchsen

® Pausetaste

@ Stop/Auswurttasle

0 Tonhohernregelknopl
® Armliithebel

(Z3 Armablage

® Nadelabdeckung

® Power switch
® Graphic equalizer
® MW/LW BAND selector

® Dial pointer (Stereo indicator)

© Balance control

© Tuning control

® Cunction selector

@' otume control

® Tape counter/Reset button
63 Record level control

0]) Microphone iacks

® Pause button

q; Stop/Eject button

0 Fast torward button ( » )

® Rewind button (« )

® Playback button (5)

0 Record button

{9 Power indicator

® Level indicator
Cassette holder
Headphones jack

© Tonearm

@ Speed selector

® Pitch control knob

® Arm litter lever

@ Arm rest

® Stylus cover

SIGNATION DES COMMANDES

® Interrupteur principal

® Egaliseur graphique

© Commutateur de bande
MO/GO

® Aiguille de cadran
(indicateur de stereo)

(5) Commande de balance

(9 Commande d'accord

(D Commutateur de tonction

® Controle de volume

® Compteur de bande/bouto
de remise

® Commande de niveau

® Touche d'avance rapide
( » )

® Touche de rembobinage
i« )

® Touche de lecture ( b)

0 Touche d'enregistrement

® lndicateur de secteur

® lndicateur de niveau

® Ports-cassette

@ Prise de casque

n 3 Bras acoustioue
® Commutateur de vitesse
G Commande de pas

® Schnellvorlaultaste ( DD )

denregistrement
® Prises de microphone
® Touche de pause
® Touche d'arrét/éiection

@ Levier de Ievage de bras
® Appui de bras
® Couvercle de stylel

SAFETY PRECAUTION

The following precautions should be observed when servicing.
1. Since many parts in the unit have special safely related characteristics, always use genuine Hitachi's replacement parts.
Especially critical parts in the power circuit block should not be replaced with other makers.

Critical parts are marked with A

in the circuit diagram and printed wiring board.

2. BeIore returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain that it
is completely sate to operate without danger of electrical shock.

SPECIFICATIONS
GENERAL SPECIFICATIONS

Power Supply AC 120 V. 60 Hz

Power Consumptlon 65 W

Dimensions 32-5/8"(Hl X 17-1/8"(W) X 13-3/4(Dl
{83(H) x 43.5(W) x 35(0) cm]

Weight 42 lbs. (19 kg)

AMPLIFIER SECTION

Audio output 5 watts per channel. min. RMS. at
8 ohms trom 70 Hz 0 15 kHz, with
no more than 10% total harmonic
distortion.

100 Hz 3:8 dB

1 kHz 18 dB

10 kHz 1:8 dB

Tone Control

Input Soneltlvtty and
Impedance
Output Impedance

Microphone 3 mv, 1 kohms
Speaker: 8 ohms
Headphones : 8 ohms

TUNER SECTION

CIrcult System
Tunlng Range

FM/AM 2-band superheterodyne
FM : 88 to 108 MHz
AM 2530 to 1.605 kHz

IHF Sonoltlvlty FM 75 ohms, 2pV(17.2 dBt)
AM : 300 uV/rn (S/N 20 dB)
FM stereo Sspsrtstlon 30 dB
FM SlgneMo-Nolse Ratlo 60 dB
Antennas FM : Line cord or External
antenna

AM : Built-in territe-core antenna

TAPE DECK SECTION

Cassette tape deck

Cassette tape (0-30, 60. 90)
1»7/ (4.75 cm/s)

Taps Speed
Recordan System and
Bias Frequency

Track System

AC bias. 85 kHz
4 track 2 channel

Ereslng System AC erase
Frequency Response 100 Hz to 10 kHz
Slgnalvto-Nolu Ratio 45 dB
Wow and Flutter 0.3 % WRMs
Crosstalk 50 dB
Erase flatlo 60 (13
Motor DC Motor

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