Hitachi HRDMD 03 Service Manual

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E§) HITACHI TY No. 615 EGF

SERVICE MANUAL [usflfigzfl'ififim

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CONTENTS-~- INHALTSVERZEICHNIS - TABLE DES MATIERES
SPECIFICATIONS -------------------------- 2 TECHNISCHEN DATEN ~~~~~~~~~~~~~~~~~~~ 3 CARACTERISTIQUETEOUNIOUES 4
DISASSEMBLY »- 5 DEMONTAGE -------- DEMONTAGE 5

ADJUSTMENTS -
INSPECTION OF MECHANISM --

REGLAGE ------
INSPECTION DU MECANISME --

' 8 EINSTELLUNGEN
-- 10 PRUFUNG DES LAUFWERKS
LUBRICATION ,. ~~ 17 SCHMIERUNG LUBRIFICATION
MAINTENANCE 17 PFLEGE DES GERATS " ENTRETIEN -----
DIFFERENCE FOR DESTINATION --- 18 UNTERSCHIEDE NACH DIFFERENCE EN FONCTION

14
-- 16
17
u I7

CIRCUIT DIAGRAM """"""""" 21-27 BESTIMMUNGSLANDERN DU PAYS DE DESTINATION ------------ 18
PRINTED WIRING BOARD - 29*34 SCHALTPLAN ----- PLAN DE CIRCUIT -- 21 27
WIRING DIAGRAM ------------------- 35 PRINTPLATTEN ,. PLAN DE BASE - 29-34
EXPLODED VIEW ---------------- 37 VERDRAHTUNGSSCHEMA SCHEMA DE CABLAGE

REPLACEMENT PARTS LIST EXPLOSIONSANSICHT - VUE EXPLOSEE -------

ERSATZTEILLISTE ~~~~~~~~ TABLEAU DES PIECES 4

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

STEREO TUNER-AMPLIFIER DOUBLE CASSETTE RECORDER

August 1989 YOKOHAMA WORKS

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HRD-MD03

SAFETY PRECAUTIONS

The following precautions should be observed when servicing.

1. Since many parts in the unit have special safety»re|ated 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 of electrical shock.

SPEC/FICA TIONS
O G ENERAL
Power supply: ACi 20V, 60 Hz [for US, CS]

Power consumption:

Dimensions:
Weight:

0 AMPLIFIER SECTION
Audio output:

Music power output:
Tone control:

Input sensitivity and
Impedance:

signal to noise ratio:
(IHF-A network)
Output Impedance:

.TUNER SECTION

Circuit system:

ACZZOV, 50 Hz [for ES, ZS]
AC240V, 50 Hz [for 83. SA]
AC110-120/200-220/230-240V.
50/60 HZ [for EWI

145W [for US. CS]

150W [except US, CS]

370 (W) x296 lH) x300 (D) mm
6.6 kg [for SA]

6.5 kg [except SA]

30 Watts per channel, min. RMS. atB ohms
from 100 Hz to 10 kHz, with more than 2%
total harmonic distortion.

[for US, CS]

30W x 2 (8 ohms, T.H.D. 5%

both channel driven. 1 kHz)

[except US, CS]

60W x 2 (8 ohms, 1 kHz)

is :13 (at 63 Hz. 250 Hz, 1 kHz,

4 kHz, 16 kHz)

PHONO 3.5 mV/50 kohms [except BS]
PHONO 24D mVI760 1(0th [for BS]
CD 200 mV/30 kohms

PHONO 70 dB

CD 80 dB

Speaker 8-16 ohms

Headphones 8 ohms

FM/AM 2 bands
superheterodyne [except BS, ES]
FM/MWILW 3 bands
superheterodyne [for BS, ES]

Tuning range: FM 87.5- 108 MHz (50 kHz steps)
[except US, CS, SA]
SIS-107.9 MHz (100 kHz steps)
[for US. CS, SA]
AM (MW) 522-1,61I kHz (9 kHz steps)
[except US. CS. EWI
530-1520 kHz (10 kHz steps) [for US, Cl
522-1,611/530-1,620 kHz (9/10 kHz
steps)
[for EW]
LW153-231 kHz (1 kHz steps)
[for BS, ES]
FM stereo separation: 30 dB
Sensit Ity: FM 1 ,uVIS/N 26 dB) [except US. CS]
l,uV(S/N 30 dB) [for US. CS]
AM(MW) 600 pV/m (SIN ZOdB)
LW 2,500 yV/m (SIN ZDdB) [for BS, ES]
FM signal to noise ratio: 60 dB
Antennas: FM: External antenna (aerial)
AM(MW/LW): Loop antenna outdoor antenn

O TAPE DECK SECTION

Tape: Cassette tape

Tapeweed: 4.75 cm/s

Recording system and

bias Irequency: AC bias, 85 kHz

Track system: racks Zchannels

Erasing system: AC erase

Frequency Response: Normal 70-14,000 Hz
CrOz 70-14000 Hz

Signal to noise ratio: Dolby NR ON 58 dB

OFF 50 dB

Crosstalk: 60 dB

Erase ratio: 65 dB

Motor: DC motor

Wow and Flutter: 0.25% (WRMS)

Measured pursuant to the Federal Trade Commission's Trade Regulation Rult
on Power Claims for Amplifiers.