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CONTENTS~~~~~~~~~~-
SPECIFICATIONS .......................................... 1
FEATURES ................................................... 3
DISASSEMBLY AND REPLACEMENT .............. 3
SERVICE POINTS .. .. .. .. .. .. .. .. .. .. .................. .... 4
ADJUSTMENT.............................................. 5
DESCRIPTION OF THE NEW CIRCUIT.............. 6
BLOCK DIAGRAM .. ... .. .. .. .. . .. .... .... .... . .. .. .. .. . .. . 8
PRINTED WIRING BOARD ... .... . .. . . ... .... ..... .. ... 9
CIRCUIT DIAGRAM ...................................... 11
PROTECTION CIRCUIT .................................. 12
REPlACEM ENT PARTS LIST .......................... 16
Black type
FRONT AND REAR PANEL ............................. 20
SAFETY
PRECAUTION~~~~~~~~~~~~~--~~~~~~~~~~~~---.
The following precautions should be observed when servicing.
1. Since many parts in the unit have special safety related characteristics, always use genuine Hitachi's replacement parts. Especially critical
parts in the power circuit block should not be replaced with other makes.
Critical parts are marked with
Lt.
in the schematic diagram and circuit board diagram.
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.
SPECIFICATIONS
*
Measured pursuant to the Federal Trade Commission's Trade Regulation Rule on Power
Output Claims for Amplifiers.
POWER output
(Both channels driven)
Power bandwidth
Frequency characteristics
TUNER,AUX, TAPE 1,2
PHONO
Harmonic distortion (8 ohms)
(at rated output)
(at 1 /2 rated output)
Intermodulation distortion
(at 1 /2 rated output)
Input sensitivity/Impedance
PHONO
TUNER, AUX
TAPE PLAY 1 , 2
70 watts* per channel,
min. RMS, at 8 ohms from
20 Hz to 20 kHz, with no
more than 0.008% total
harmonic distortion.
75 W/ch + 75 W/ch
(8 ohms, 1 kHz, T.H.D. 0.004%)
75 W/ch + 75 W/ch
(6 ohms, 1 kHz, T.H.D. 0.004%)
5 Hz-100 kHz (T.H.D. 0.05%)
1 Hz-200 kHz ( + 0, -3 dB)
RIAA ±0.2 dB
Less than 0.008%
Less than 0.008%
Less than 0.006%
MM 2.5 mV (47 k-ohms)
MC 0.15 mV (100 ohms)
150 mV /40 k-ohms
150 mV /40 k-ohms
Output level
TAPE REC OUT 1, 2
Phono over load level
(at 1 kHz, T.H.D. 0.01 %)
Signal-to-noise ratio
(IHF, A network)
PH ONO
TUNER,AUX, TAPE1,2
Damping factor
Bass control
Treble control
Loudness control
Subsonic filter
Power supply
Power consumption
Dimensions
Weight
150 mV
MM: 250 mV, MC: 15 mV
89 dB (MM) 73 dB (MC)
(input level 0.25 mV)
100 dB
60 (1 kHz, 8 ohms)
±8 dB (100 Hz)
±8 dB (10 kHz)
+6 dB (100 Hz)
+4 dB (10 kHz)
15 Hz (6 dB/act)
AC 120 V 60 Hz, rv220 V 50/60
Hz, rv240 V 50/60 Hz or rv120
V /220 V /240 V 50/60 Hz
430 VA, 300 W (at 1 /3 rated out-
put)
500 W (at rated output)
435 (W) x 145 (H) x 392
(D)
mm
12.5 kg
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
YOKAWA WORKS
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