Hitachi J2 Serviceanleitung

@HITACHI
SERVICE MANUAL
SAFETY
The following precautionsshould be observedwhen servicing.
1. Since many parts intheunithave s pecial safety-related
critical parts in the power circuit block should not be replacedwith other makers.
Criticalparts are markedwith A in the schematicdiagramand circuit boarddiagram.
2. Beio•e
pletely save
SPECIFICATIONS
FT-J2 (FM/MW/LW
GENERAL. SPECIFICATIONS
Semi-conductors
Dimensions
Weight
TUNER SECTION
Circuit system
Frequency range
Sensitivity
FM capture ratio
SPECIFICATIONS
STEREO TUNER/STEREO AMPLIFIER
PRECAUTIONS
operate vviåi0i-'Lciangej
STEREO TUNER)
IC's: 7
Transistors: 21
LED's: 8
Diodes: 9
74 (H) x 230 (W) x 198 (D) mm
1.8 kg
FM/MW/LW 3 band superheterodyne
FM: 87.5 — 108 MHz
MW: 531 — 1,602 kHz
LW: 150 — 350 kHz
FM: 1.9 (SIN 26 dB 400 Hz, 40 kHz
Dev.)
MW: 500 gV/m
(SIN 20 dB, 400 Hz
LW: I mV/m
(S/N 20 dB, 400 Hz 30% mod.)
2 dB (1 mv, 40 kHz Dev.)
AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
March 1981
TY
CONTENTS
SPECIFICATIONS
DISASSEMBLY
DIAL CORD
ADJUSTMENT
CIRCUIT DIAGRAM
PRINTED WIRING
BLOCK DIAGRAM
REPLACEMENT
KEY TO ILLUSTRATIONS
characteristics, always use genuine Hitachi's replacement
ie thcrccgh!v
FM selectivity
FM Harmonic
FM stereo separation
FM Pilot suppression
AM suppression
Image rejection
Intermediate frequency
Antennas (Aerials)
FM freauencv
SIN (Signal to Noise
Ratio)
mod.)
TOYOKAWA
No. 248
FT-J2
HA-J2
..... .............
STRINGING
.
BOARD
.
PARTS LIST
.
parts. E specially
the to th?t it
60 dB (±300 kHz)
0.3/0.60/0 (1 mv, 1,000 Hz,
distortion
40 dB•
35/50 dB (19 kHz/38
40 dB (1 mv, FM 40 kHz Dev.,
AM300/0 mod.)•
45 dB
FM: 10.7 MHz
MW/LW: 468 kHz
FM: External antenna
300 ohms/ 75 ohms
MW/LW: Loop antenna (arerial) or
External antenna
20 Hz — 15 kHz 1±1.5 dB)•
response
FM mono: 65 dB •
FM stereo: 60 dB •
MW/LW: 50 dB•
WORKS
EGF
for W. Germany,
France, U.K.,
Australia,
Switzerland &
Sweden
.6
.6
13, 16
17
. 18
.20
. 25
kHz)•
(aerial)
(aerial)