Hitachi FT 600 Service Manual

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HITACHI

Hitachi. Ltd. Tokyo Japan

HITACHI HI-FI COMPONENT
AM/FM STEREO TUNER
MODEL FT-6OO

SERVICE MANUAL

FT-600
NO. 4 I | 972
|. SPECIFICATIONS
.Circuitry ,,,,,,,,,,,, AM/FM 2 Band Super-heterodyne 0AM section
OSemi-conductor ............................................. FET : 1 Frequency range: .................... 530 - 1,605 kHz
1C 3 3 Usable sensitivity (IHF): ........................ lS/lV
Transistor: 28 Image rejection: ......................... more than 60dB
Diode : 29 Selectivity: ................................. more than 40dB
0 FM SGCtiOn Signal-to-noise ratio: .............. more than 50dB
Frequency range: -------------------------- 88 ~ 108 MHZ Output voltage: ................................... 0.5v (Fix)
Usable sensitivity (IHF): .......................... 1.8/V 0-0,5V(Variable)
Distortion: ..................................... Monaural 0.3% OOutput impedance ....................................... 4kfl
Stereo 05% 0 Power requirements ........................ AC 120V, 60Hz
Image rejection: ---------- more than 70dB (98MHZ) 0 Power consumption ........................................... 15W
Signal-to-noise ratio: .................... more than 70:13 . Dimensions ,,,,,,,,,,,,,,,,,,,,,,,,, 16(W) x 5m) x 12(0) in
Capture ratio: ............................. less than lde (412 x 1225, :iSmm)
IF rejection: ............................. more than 90dB
AM suppression ........................ more than 50dB . Weight 16.4 lbs, (7.6 kg)
Spurious response: more than 90dB
Selectivity (Alt.ohannel IHF): ..... more than 50dB .Accessory circuits ..... FM muting switch, Noise filter
Channel separation! -------- more than 40013 ((1) irriteChstlgrllelngIgntzruTgIal :th
Antenna input impedance: ............ 75/300 ohm change-over, FM stereo indicator
Output voltage: ............................... st (Fix) lamp mm mm" output level

control, AM bar antenna, FM
O'O-SV (Variable) sensitivity change-over switch.

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MODEL FT-600 SERVICE MANUAL

2. FEATURES

1. "Just Tune System offering easy tuning
FM broadcast reception has been further simplified.
Within the range where the pointer lamp stays lit,
dependable reception with the least noise can be
enjoyed,

2. FM Tuner section adopting FET and IC
The high-performance FET (field effect transistors)
in the FM FRONT END section and the four variable
condensers improve the high sensitivity and low noise
characteristics. The image ratio and spurious response
ratio also have been enhanced
By adopting an IC (integrated circuit) and a high-
performance IFT(i.ntermediate frequency transformer)

3. FRONT AND REAR PANEL

FM indicator Iamp FM stereo indicatnr
(STEREO)
AM indicator lamp
(AM)

Tuning meter

V FM muting switch

Pfg'g'wgggcl (FM MUTING)
Noise ii ter switch
(NOISE FILTER)

FM sensitivrty switch
(FM DIST-LOCAL)

FM antenna terminal

AM antenna terminal

Variable output terminal
(Variable)
Out ut level control
{LEVEL CONTROL)

Ground terminal
(GND)

Cable iix board

cnsnbw

Dial painter

Fixed output lermmal

in the Intermediate Frequency Amplifier section,
selection performance has been improved, and the
capture ratio has been hiked.

lnterstation noise sharply cut by FM muting switch

. Disagreeable noise killed by noise filter switch

FM sensitivity transfer switch

. Mu Itipath terminal

By simply connecting an oscilloscope to the Multipath
terminal, the Multipath reflected by a hill or a
building can be observed.

. AM Tuner section equipped with ferrite antenna
. Large tuning meter and dial scale of uniform graduation

Dial scale Tuning knob

Mode switch AM function switch
(MODE) (AM)

FM function swncn

(FM AUTO) Fig.1

AC power outlet

AM bar antenna AC léféwljse

FM mullipaih lefmlnal ~-Power cord

(FM MULTIPATH)

Fig. 2