Hitachi HA 2800 Service Manual

Page 1

No. 263 EGF

@HITACHI

HA-2800
.SERVICE MANUAL HA-1800

{- CONTENTS
SPECIFICATIONSMWN
FEATURES.......run... _
DESCRIPTION OF THE NEW CIRCUIT ----- 3
BLOCK DIAGRAM"
PRINTED WIRING BOARD
CIRCUIT DIAGRAM ............. . ......... 6

RPINTED WIRING BOARD --7
CIRCUIT DIAGRAM ----------- mug
DISASSEMBLY AND REPLACEMENT-m-HQ
REPLACEMENT PARTS LIST- -~ 10,11,12.13
A FRONT AND REAR PANEL -
\
[HA-1800]
SAFETY PRECAUTION
The Iollowing precautions should be observed when servicing
A 1. Since many parts in the unit have special safety related characteristics. always use genuine Hitachis 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 schematic diagram and circuit board diagram,
2t 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
Power output 25 watts" per channel, min. nggélfifé OUT ISO v
' m
(Bath Channels drive") RMS 3 8 ,0th from 40 HZ to Phone overload level (at 1 kHz ) I20 mV
.. 20 ksz Wlth I10 more than (70 Signal to- noise ratio (IHF A neiwork)
total harmonic distortion. PHONO 7! dB
, TUNER AUX (HA- I800) TAPE 93 dB
25 W/ch+15W/ch 7
(4/8 ohms. I kHz. T H.Dt.0 1%) 3:35:32? goggsknzdogfigml
Power bandwidth I0 HZ -30 kHz I TrebIe control t 8 dB ('0 kHz)
, (80hrnyTrHtD 01% [,1 Rated) Loudnesscuntml +6dBUOO Hz)
Frequency characIerIstIus * 4 dB (IO kHz)
TUNER.AUX(HA-1800).TAPE 20 HZ~40 kHz I+|0fl30dBI Subsonic filter 20 Hz '
PHONQ . . RIM 1 0'5 13 Power supply AC 120 V60 Hz ~ :10 v 50, 60 Hz,
Harmunlc dIstortton (8 ohms) ~ 240 V 50/60 Hz or
(at rated output) Less than OVIW' ~ 170 V/"O V/I40 V 50/60 Hz
(at 1/2 rateti output) . Less than 0.1% Power consumption 90 W (at l/IO rated output)
IntermoduIatIon distortion 140W (at I/3 rated out ut)
(at 2 rated output) Less lhan O.I% 20 W (m rated OUIPUllp
Input sensitivity/Impedance .
PHONO 15 (W47 kohms agghnzsrons :3;£;H£§g&))xyl43 (D) mm
TUNER. AUX (HA-I800) 150 n1V/40 k-oIIms 4 6 k (HA~I800)
TAPE PLAY I50 mV/40 kuhms ' g

*Measuted pursuant ID the Federal Trade Commissions Trade ReguIatIon
Rule on Power Output Claims for Amplifiers.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

STEREO AMPLIFIER

May 1981 TOYOKAWA WORKS