Mitsubishi dp 780 service en

Page 1

A MITSUBISHI

AUDIO SYSTEMS

SERVICE MAN UAL
MODEL DP-78 O

CONTENTS

SPECIFICATIONS ..................................................................... 2
DISASSEMBLY ....................................................................... 2
DESCRIPTION OF OPERATION ........................................................... 3
ADJUSTMENT PROCEDURES ............................................................ 4
PRINTED CIRCUIT BOARD .............................................................. 4
SCHEMATIC DIAGRAM ................................................................. 5
EXPLODED VIEW ..................................................................... 7
MECHANICAL PARTS LIST .............................................................. 8
PARTS LIST ......................................................................... 9
PACKING INSTRUCTIONS ............................................................... 10

AMITSUBISHI ELECTRIC CORPORATION

Page 2

SPECIFICATIONS

1. PHONO MOTOR SECTION

Drive mechanism Direct drive

Motor Quartz PLL DC servo
Platter Diameter 30.3 cm (12")
Material Aluminum diecast

Platter speed 33-1/3, 45 r.p.m.
Wowand flutter 10.05% (DIN Wp-p)
0.03% (Wrms)

Signal to noise ratio 55 dB (lEC-B)
70 dB (DIN-B)

2. TONEARM SECTION

Static balance, straight arm
28.3 cm (11-1/8)

21.5cm (8-1/4)

11 mm (7/16")

Type
Overall length
Effective length

Overhang

Tracking error (30 cm LP) +3° ~_1°
Offset angle 23°
Possible cartridge weight 4 g to 8 9

Tracking force adjustment 0 to 3 g (0.1 9 step)

3. CARTRIDG E SECTION

Type Dual moving magnet
Stylus 0.6 mil diamond
Recommended tracking force 2 9
Output level (1 kHz, 5 cm/sec) 3 mV
Channel separation (1 kHz) 20 dB
4. GENERAL

Power consumption 5 W

Dimensions (W x D x H)

Weight

424 x 378 x130

(16-11/16 x14-7/8 x 5-1/8")

6,9 kg (15-3/16 lb)

Design and specifications are subject to change without

notice for improvement.

DISASSEMBLY

1. Removal of the Tonearm

1. Remove the bottom cover.

2. Disconnect the soldering for the 6 output lead wires

from the tonearm.

3. Loosen the screw securing the return lever to the
tonearm pivot. The return lever may thus be removed
from the tonearm pivot.

. Remove the 5 tonearm mounting screws [ see Fig.1 (Y)].

Remove the arm lifter catch.

6. The tonearm may now be lifted out from the main

cabinet.

.O'I-b

I
I
l
. J, l .
: Tonearm mounting
screws (1 - 3 x 8
tapping screws)

Return plate

Fig. 2