Hitachi FT 12 Service Manual

Page 1

I§i HITACHI

SERVICE MANUAL

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The PITA-12 comes In two color versions, black and sliver.
They are the same except Ior parts list.

Der HTA-12 wlrd In xweI Versionen gelielert, schwarz und silber.
Sle lIlld gleich mIt Ausnahme der Telleliete.

Le HTA-12 est disponible en deux versions, noir et argent.
Elle: sont identiques a lexception de la Iiste des pi'eces.

SAFETY PR ECAUTION

TY No. 411 EGF

HTA-1 2
(FT-12,HA-12)

fi-CONTENTS ' INHALT - SOMMAIRE
SPECIFICATIONS , TECHNISCHE DATEN
CARAcTERISTIoUEs TECHNIQUES
DIAL cono SETTING - SKALENSEI
EOUIPEMENT DE CADRAN --------------------------- 4
DISASSEMBLY AND REPLACEMENT- ZERLEGUNG UND
AUSTAUSCH - DEMDNTAGE ET REMONTAGE ---------- s
BLOCK DIAGRAM- BLOCK SCHEMA- SCHEMA ~~~~~~~~~ 5
GENERAL ALIGNMENT INSTRUCTION-

ALLGEMEINE AUSRICI-ITANLEITUNG -

INSTRUCTIONS GENERALEs --------------------------- 7
FM TUNER ALIGNMENT ABGLEICH DEs

UKw-TUNERs- REGLAGE DE TUNER FM ----------- 7,3
AM TUNER ALIGNMENT~ AEGLEICN DES

AM-TUNERs- REGLAGE DE TUNER AM ------------- 9,10
PRINTED WIRING BOARD PRINTPLATTEN ~

PLAN DE BASE -------------------------- 11,13.15,11
CIRCUIT DIAGRAM - $CHALTPLAN-

PLAN DE BASE ----------------------------- 12,14,115, 11
FRONT AND REAR PANEL-

VORDERE UND HINTERE BEDIENUNGSTAFEL-
PANNEAUX AVANT ET ARRIERE ------------------- 13,19
REPLACEMENT RARTs s

TABLEAU DES PIECE

The following precautions should be observed when servicing.

I, 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 Before returning a repaired unit to the customer. the service technician must thoroughly test the unit to ascertain that it
is completely safe to operate without danger oi electrical shock,

SPECIFICATIONS

AM/FM 2-band Stereo tuner
MW/LW/FM 3-band Stereo tuner

Circuitry

0 FM SECTION
Frequency range 88 - 108 MHz
Usable Sensltlvlty 11.2 dBf (IHF), 1.0 [LV (75 ohms DIN)
50 dB Quietlng Sensltlvlty 224 dBf (MONO)
39.5 dBt (STEREO)
Image interference ratio 45 dB (98 MHZ)
Total harmonic distortlon MONO : 0.3 % (1 kHz)
STEREO ; 0.4 % (1 kHz)

Selectivity 50 dB
Stereo separation 40 dB (1 kHz)
[except for W. Germany & Italy]
Capture ratlo 1.0 dB
Output voltage 550 mV (1 kHz)

0 AM (MW) SECTION
Frequency range
Sensltivlty

53D - 1,605 kHz

40 p.V(DlN) . . . S/N 26 dB
20 ,Iv (IHF) 500 uV/m
(IHF Loop antenna)

Signal-to-nolse ratlo MONO : 75 dB (IHF) Image Interference ratio 36 dB
65 dB (iEC, unweighted, Selectlvny 35 dB
ineak) Slgnallto-nolse ratio 45 dB
60 dB [IEQ weighted, Output voltage 165 mv (400 Hz. 30% modulation)
Q-peak)

STEREO: 70 dB (IHF)
60 dB (IEC, unweighted,

0 AM (LW) SECTION
Frequency range

150 ~ 350 kHz

Q-peak) 5°SWV'W 200 IN (DIN) . . . 5m 25 as
55 dB (IEC, weighted, 0 GENERAL
Q-peak) Dlmenslona 435(W) >< 60(H) X 236(0) mm
Frequency response 50 Hz - 12 kHz (50 us :2 dB) Weight 2.4 kg(513 lbs.)

50 Hz- 15 kHz (50 ,Is :33 dB)
[for W. Germany & Italy]

50 Hz- 12 kHz (75 us 12 dB)
[for USA Bl Canada]

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

STEREO TUNER AMPLIFIER

March 1984

TOYOKAWA WORKS