Hitachi HA 6800 Service Manual

Page 1

TY No.289EGFI

HA-6800

L

fi CONTENTS

SPECIFICATIONS
FEATURES .....
DISASSEMBLY AND REPLACEMENT
, ,, SERVICE POINTS
MA/,2 ADJUSTMENT.. .....
- DESCRIPTION OF THE NEw CIRCUIT ..
BLOCK DIAGRAM ..
PRINTED WIRING BOARD .
CIRCUITDIAGRAM
CHECKING THE OPERATION OF THE
PROTECTION CIRCUIT ..... .. ...............
REPLACEMENT PARTS LIST .
FRONT AND REAR PANEL

Black type

SAFETY PRECAUTION

The followmg precautions should be Observed when servrcing,

1. Since many parts in the unit have special safety related characteristics, always use genume Hitachis replacement parts. Especially critical
parts in the power Circuit block should not be replaced wrth other makes.
Critical parts are marked With A In the schematic diagram and Circuit board diagram.

2. Before returning a repaired iian to the customer, the service technician must thoroughly test the unit to ascertain that it is completely
safe to Operate Without danger ol electrical shock.

SPECIFICATIONS

" Measured pursuant to the Federal Trade Commissions Trade Regulation Rule on Power
Output Claims for Amplifiers.

POWER output 70 watts* per channel, OutDUt level
(Both channels driven) min. RMS, at 8 ohms from ngonésrckgEE/ef 150 "V
20 Hz to 20 kHz, With no (at 1 kHz, T.H.D. 0.01%) MM: 250 mv, MC: 15 mV
more than 0.008% total SlgnaIFIO-HOISB ratio
I1 . d. t 1'0 (IHF, A network)
armomc 5 0 i PHONO 89 dB iMMi 73 dB (MO
75 W/ch + 75 W/oh (input level 0.25 mVl
l8 ohms,1 kHz, TrH.D. 0.004%) TUNER, AUX, TAPE 1, 2 100 dB
75 W/ch + 75 W/Ch Damping factor 60 (1 kHz, 8 Ohmsl
(6 ohms, 1 kHz, T.H.D. 0.004%) Bass control :8 dB (100 Hzl

Power bandwidth 5 Hz~ IOO kHz (T.H,D. 0.05%) Treble control :8 dB llO kHz)

Frequency Characteristics Loudness control +6 dB 1100 Hz)
TUNER, AUX, TAPE 1, 2 IHZ»200 kHz (+0, -3 dBl +4 dB (10 kHz)
PHONO RIAA $0.2 dB Subsonic filter 15 Hz l6 dB/oct)

Harmonic distortion l8 Ohms) Power supply AC 120 V 60 Hz, N220 V 50/60
(at rated outputl Less than 0.008% Hz, ~240 V 50/60 Hz or ~120
(at 1/2 rated output) Less than 0.008% V/ZZO V/240 V 50/60 HZ

Intermodulatlon distortion Power consumption 430 VA, 300 W (at 1/3 rated out~
lat 1/2 rated outputl Less than 0.006% putl

Input sensnivity/lmpedanoe 500 W (at rated outputl
PHONO MM 2.5 mV (47 l<~ohmsl Dimensions 435 (W) x 145 lHl x 392 ID) rnm

MC 015 mV (100 ohmsl Weight 12.5 kg
TUNER, AUX 150 mV/40 k-ohms
TAPE PLAY 1, 2 150 mV/4O krohms

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

STEREO AMPLIFIER

October 1981 TOYOKAWA WORKS