Hitachi J 2 Service Manual

Page 1

TY No. 259 EGF

HITACHI

f U.S.A., C d ,

J 2 FT-JZ Aosria & Latin 8'13 a
HA-J2 American countries,
etc. J

SERVICE MANUAL

CONTENTS

SPECIFICATIONS ................................... 1
DISASSEMBLY .................
DIAL CORD STRINGING.

ADJUSTMENT .........
CIRCUIT DIAGRAM. .
PRINTED WIRING BOAR.D
BLOCK DIAGRAM .............
REPLACEMENT PARTS LIST
KEY TO ILLUSTRATIONS ..........

.r. nu...

(SAFETY PRECAUTIONS

The foiiowmg precautions shouid be Observed when serVicing.

1, Since many parts in the unit have special safetyrrelated characteristids, aiwavs use genuine Hitachi's repiacement parts. Especiaiiy
criticai parts in the power circuit biock should not be repiaced With other makers.
Criticai parts are marked with A; in the schematic diagram and CirCUII board diagram

2, Before returning a repaired unitsto the customer, the sen/ice technician must thoroughiy test the unit to ascertain that It is come
pleteiy safe to Operate Without danger of eiectricai shock.

POUR LE CANADA
ATTENTION CONTRE LE REMPLACEMENT DE FUSIELE

AFIN D'ASSURE UNE PROTECTION PERMANENTE coma: LES RIS-
CIUES DINCENDIE, REMPLACER UNIOUEMENT PAR UN FUSIBLE DE
MEME 1-er ET MEME PUISSANCE EN ACCORD AVEC LE TIOUETTE
DU SVMBOLE DE CHAOUE FUSIBLEL
La indication qui suit as! part6: sur I'étiquutte da cheque fusible intégré
dans l'appareil.

- Example

Ca symbols lignifie qu'il s'agit d'un Iusir
ble 5 fusion retavdée da 2 At 125 v.

FOR CANADA
CAUTION AGAINST FUSE REPLACEMENr

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE
ONLv WITH SAME TVPE AND sAME RATING FUSE IN ACCORDANCE
WITH THE ruse SYMBOL LABEL.
The Inlluwing is indicatinn DI the Iuse symbol label which is affixed ads
jacent to me ruse in the equipment.

. Exampie

This symbol indicales Slaw Operating

SPECIFICATIONS

Fr-JZ (FM/SW/MW STEREO TUNER) FM capture ratio gongHi r2310 iii k)Hz Dev)
GENERAL PE IFI ATI N FM selectivity I Z
Semi-condfictofs C O icsis- 7 FM Harmonic distortion OLE/06% 11 mV, 1,000 Hz,

Transistors: 23 MONO/STEREO)

FET: 2 FM stereo separatiun 40 dB

LED's 8 FM Pilot suppression 35/50 (18 119 kHz/38 kHz)

Diodes 11 AM suppression 40 dB (1 rnV, FM 75 ki-iz Dev ,
Dimensions 74 1H) x 230 (W) x 198 (Di mm . , AM3°% mm
Weight 1.8 kg Image rejection 45 dB

Intermediate frequency FM: 107 MHz

TUNER 550" MW/SW: 455 kHz
CIrcuit SYStem FM/SW/MW 3 band superheterodvne Antennas (Aerials) FM: Externai antenna (aeriai)
Frequency range FM: 87.5 7 108 MHz 300 ohms/75 ohms

SW' 3-8 12 MHZ SW: Externai antenna

MW' 530 7 1,605 kHz MW: Loop antenna (arer'iali or Externai
Sensitivity FM: 1.9 [AV iS/N 30 dB 400 Hz, 75 kHz antenna iaeriali

Dev-1 FM frequency response 20 Hz - 15 kHz 111.5 cm

SW- 25 IN S/N (Signal to Noise

iS/N 20 dB, 400 Hz 30% mod.) Ratio) FM mono: 55 dB
MW: 15 V FM stereo: 60 dB
(S/N 20 dB, 400 Hz 30% mod 1 MW/SW: 50 dB

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

STEBEII TIIIIEII/STEIIEII AMPLIFIER

April 1981 TOYOKAWA WORKS