Hitachi DE 33 Service Manual

Page 1

"(I No. 1664i

@HITACHI

D-E33
SERVICE MANUAL (U,C,FS,BS,AU,W)

CONTENTS
Specifications ........................ 2
9 Disassembly .......................... 2
Adjustment .......................... 3
Inspection of mechanism ................. 4
a l! O Lubrications ......................... 4
Circuit board diagram ................... 5
'fl 7"":- 7 Schematic diagram ..................... 7
I: -' L3H? _. n n 0 Wiring diagram ....................... 10
- - i _ - ' Replacement parts list .................. 13
Exploded View (Mechanism ML-lOFI ........ 15
65} Exploded view (Cabinetl ................ 17
KEY TO ILLUSTRATIONS
6) POWER (MAINS) SWITCH @ MlCROPHONE SOCKETS
@ RECORDING INDICATOR @ DOLBY B/C NR CHANGE OVER SWITCH
C3) PLAYBACK INDICATOR @ DOLBY NR SWITCH
@ PAUSE INDICATOR (5) TAPE SELECT SWITCHES
(5) TAPE COUNTER EJECT BUTTON
© REC MUTE SWITCH I7 PAUSE BUTTON

STOP BUTTON

FAST FORWARD BUTTON
PLAYBACK BUTTON

1 REWIND BUTTON
RECORD BUTTON

® DIGITAL PEAK METER
RECORDING BALANCE CONTROL
@ DOLBY C NR INDICATOR
RECORDING LEVEL CONTROL 2
@ HEADPHONE SOCKET

>®®©O®

®C

- SAFETY PRECAUTION

The following precautions should be observed when servicing.

1. Since many parts in the unit have special safetyvrelated 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 Akin 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 AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

STEREO CASSETTE TAPE DECK

January 1982 TOKAI WORKS

Page 2

D-E33

SPECIFICATIONS
Semiconductors: Dolby NR OFF: 58 dB (Weighted A, Reference
ICs: 6 3% THD Metal Tape)
Transistors: 13 58 dB
Diodes: 11 Wow and Flutter: 0.05% (WRMS)
LEDs: 17 0,17%*
Track System: 4 track 2 channel stereo Input Sensitivity and
Tape: Cassette tape (C-30, 60, 90) Impedance:
Tape Speed: 4.75 cm/s Microphone: 0.5 mV, 300 ohms ~5k ohms
Recording Sys1em Line in: 80 mV, 50k ohms or more

and Bias Frequency:
Erasing System:
Erase Ratio:

AC bias, 85 kHz
AC erase
65 dB or more (at 1 kHz)

Frequency Response:

NOR-l: 20 Hz~15 kHz

30 Hz~14 kHz (13 dB)
30 Hz~14 kHz*

20 Hz~16 kHz

30 Hz~15 kHz (:3 dB)
30 Hz~15 kHz*

20 Hz~17 kHz

30 Hz ~16 kHz (:3 dB)

30 Hz~16 kHz*

Cr02 -IIZ

METAL-IV:

S/N (Signal to Noise

Ratio):
Dolby C NR ON: 72 dB (weighted A, Reference
3% THD Metal Tape)

72 dB
66 dB (Weighted A, Reference
3% THD Metal Tape)

66 dB*

Dolby B NR ON:

Output Level: 500 mV
Output Load Impedance:

Line out: 50k ohms or more

Headphone: 8 ohms~ 2k ohms
Distortion: 1.0% (1 kHz, 160 nWb/m)
Crosstalk: 60 dB or more (at 1 kHz)

30 dB or more (at 1 kHz)

AC 120V, 60 Hz (U, C)

AC 100-110V/115-127V/
200-220V/230-250V,
50/60 Hz (W)

AC 220V, 50 Hz (FS)

AC240V, 50 Hz (BS, AU)

Channel Separation:
Power Supply:

Power Consumption: 9.5W
Dimensions: 110(H) x 435(W) x 227(D) rnn
Weight: 3.4 kg
Motor: Electronically controlled DC m
Heads: Metal SL Record/playback hear

Three~gap ferrite Erase head

* According to DIN 45 500

DISASSEMBLY

. Cassette clear panel

1) Depress the eject button to open the cassette door.
2) Lift up the cassette clear panel in the direction of the

arrow ® .

. Cassette door

Remove. (two) nylon rivets.
Upper cover
Remove © and ® (two) screws.

. Bottom cover

Remove © , ®and @ (three) screws.

. Front panel

Remove ® (seven) screws.

. Main PC board

1) Remove ® and © (two) screws and jack holder ® .
2) Pull the PC board in the direction of the arrow®.

. Cassette chassis

Remove @and ® (two) screws.
Power PC board
Remove ® (two) screws.

Nylon rive

=3

[Ill-mill
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