Hitachi HCA-7500MKII Serviceanleitung

@HITACHI
SERVICE
SAFETY PRECAUTIONS
The following precautions should be observed when servicing.
1. Since many parts in the unit have special safety related characteristics, always use genuine Hitachi replace-
ment parts. Especially critical parts in the power circuit block should not be replaced with other makes.
Critical parts are marked with
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
SPECIFICATIONS
Input sensitivity/-
Impedance
PHONO (MM)
PHONO (MC)
TUNER. AUX
TAPE PLAY
Max. input level
(1 kHz, T.H.D. 0.005%)
PHONO
(MM, MC 2.5 mV)
PHONO (MC 0.1 mV) 10 mV
Output level/ Impedance
TAPE REC OUT
PRE OUT
Frequency
characteristics
PHONO (MM. MC)
TUNER, AUX
Signal-to-noise ratio
(IHF. short-circuited,
network)
PHONO (MM)
PHONO (MC)
STEREO
MANUAL
in the schematic diagram and circuit board diagram.
2.5 mV/100 k-ohms, 47 k-ohms.
22 k-ohms
0.1 mV. 2.5 mV/100 ohms
150 mV/47 k-ohms
150 mV/47 k-ohms
260 mV
150 mV/600 ohms
1 V/600 ohms
20 Hz — 20 kHz 1±0.2 dB RIAA)
5 Hz — 100 kHz dB)
A
91 dB
75 dB (input level 0.25 mV)
CONTROL
October 1980
TY
CONTENTS
SPECIFICATIONS
FEATURES
DESCRIPTION
SERVICE
ADJUSTMENTS
CIRCUIT
PRINTED
TROUBLESHOOTING
BLOCK DIAGRAM
DISASSEMBLY
REPLACEMENT
danger of electrical shock.
TUNER, AUX
Total harmonic
distortion
(20 Hz — 20 kHz)
PHONO
TUNER, AUX
Tone control
BASS
TREBLE
Loudness control
(Volume —30 dB)
Subsonic filter
Mute
Power supply
Power consumption
Dimensions
Weight
Specifications and parts are subject to change for improvement.
AMPLIFIER
TOYOKAWA
No.238EGF
7500M
OF THE NEW CIRCUITS
POINTS
DIAGRAM
WIRING BOARD
AND REPLACEMENT
PARTS LIST
104 dB
Less than 0.005% at REC OUT le,eJ 5 V
Less than 0.005% at PRE OUT
± 8 dB (50 Hz, 100 Hz turnover
150 Hz, 300 Hz)
± 8 dB (10 kHz, 20 kHz turnover at
3 kHz, 6 kHz)
+8 dB (50 Hz). +3 dB (10 kHz)
15 Hz (6 dB/oct)
-20 dB
AC 120 V 60 Hz, 220
50/60 Hz. 110 — 120 V
240 V ru50/60 Hz
18 W (AC 120 v. 220 v — 240 v-v)
435 (W) x 83 (H) x 292 (D) mm
4.5 kg
WORKS
m
3
4
6
8
9
10
11
12
. 12
13
le,el 5 V
at
240 V
1220