Rotel RMX 82 Service Manual

Page 1

I it unpwmnrd

Technical
Manual

TABLE OF CONTENTS
PART I: RMD-SZ

Specifications ............................. 1
Alignment ..... 2
Troubleshooting Guide ...... 3
Parts List .............. 6
Disassembly Diagram ....... 7
Chassis Layout (Top View) , . . 9
Block Diagram ............................. 9
Schematic Diagram ......................... 10
P-c Board Diagrams ......................... 12
PART II: RMX~82/L

Specifications ............................ 17
Function of Counter and Frequency Display Circuit ...... 18
Alignment ........... 18
Addenda ........... 20
Block Diagram. . , ...... 2D
Dial Stringing Diagram ............ 23
Parts List ............................... 24
P-c Board Diagrams ......................... 26
Chassis Layout (Top View) .................... 28
Schematic Diagram ......................... 29

PART I

CASSETTE DECK

Serial No. Beginning
NE 40711

RMD-82

STEREO

STEREO 2;ng RMX-BZ/L

TABLE DES MATIERES

SECTION I: HMO-82
Caractéristiques . .
Réglage .......
Guide de depannage ......................... 5
Lisue des piéces ..........
Schema de démontage ..............
Installation du chassis (vue de dessus) .....
Schéma sv noptique ........
Diagramme schematique ..... , .
Diagrammes des plaquettes de circuits imprimés ........

SECTION II: RMX-BZ/L

Caractéristiques ........................... 17
Schéma svnoptique ......................... 20
Fonction du circuit compteur et affichage de fréquence. . . . 21
Fléglage ................................ 21
Addenda ............................... 23

Diagramme du cable d'entrainement ......
Liste des pieces ..........
Diagrammes des plaquettes de circuits imprimés .
Installation du chassis (vue de dessus) .....
Diagramme schématique ...................... 29

RMD-82 STEREO CASSETTE DECK

Specrflcations Caracterlstiques

Heads: Rec/Playback ...... High B Permalloy laminated type
Erase ........... Ferrite core

Track ............ 4-track/2-channel

Tape Speed , , . ..... 4.8cm/sec,

Motor ............ Electronic DC Governor

Wowand Flutter ........ 0.15% (DIN)

0.05% (WR MS)
Distortion (R EC/PB,

400Hz) ............ 1.5% (METAL)
Frequency Response (-20dB):

Normal, LH ......... 30 to 14,000Hzt3dB

Special . . . . ..... 30 to 15,000H213dB

Metal ............. 30 to 17,000Hzt3dB
Signal-torNoise Ratio (WTD. 0dB=580mV,

Chromium) ......... Dolby NR in: 64dB

Dolby NR out: 55dB
lnout Sensitivity/Impedance. .MIC 0.3mV/10 kohms
LINE 30mV/47 kohrns
Output Level/Impedance, . . .LINE 580mV/1 kohm

THE HOTEL. 30.. LTD.

Fast Wind Time (C-60) ..... 90 seconds
Tape Selector ' BIAS EQUALIZER
Normal, LH ......... 100% 120%
Special ............ 150% 70115
Metal ............. 200% 70us
MISCELLANEOUS
Power Requirement ....... Power supplied from the receiver
RMX-SZ,
Dimensions (Overall) ...... 279 (W) x 120 (H) X 206 (D) mm
11" X 4-23/32" x 8-1/8"
Weight (net) ........... 3,2kg/7.04 lbs,

0 Specifications and design subject to possible modification
without notice.

0 Dolby, and the doublerD symbol are trade marks of Dolby
Laboratories Licensing Corporation.
Noise reduction system manufactured under license from
Dolby Laboratories Licensing Corporation.

1-36-8 OHOKAVAMA, MEGURO-KU, TOKYO 152 JAPAN

2ND FLOOR. EVERGLORY BLDG, N0. 305, SECTION 3,
HOTEL. ELECTRONICS 1.30.. I_'I'D. NANKWGE. ROAD,TA.pE.,TA.WAN, REPusLic OF CHINA

RDTEI- OF AMERICA, INC.
RDTEI- HI FI LIMITED.

13528 SDI NORMANDIE, GARDENA, CALIF. 90249, U.S.A.

24 ERICA HOAD, STACEY BUSHES, MILTON KEYNES,
BUCKINGHAMSHIRE, ENGLAND

Page 2

Alignment

Instrument: Audio generator, AC VTVM, oscilloscope,
test tape (LCTr3004-C and LOT-7001 or equivalent),
normal" blank tape (TDK AD tape).

A. Azimuth Adjustment

1.

2.

Set Tape Selector to NORMAL and Dolby NR switch
to OFF

Insert test tape (LCTv3004-C or equivalent) into deck
and play it back.

Adjust azimuth screw (Fig. 1) to maximize the
output levels of both channels at playback and
minimize the difference in output between left and
right channels.

. After adjustment, fix the azimuth screw with paint.

A

AZlMUTl-I
SCREW

r-

O

REC/PE HEAD

Fig. 1

Rec Bias Adjustment

. Insert normal blank tape into the deck. Set Tape

Selector to NORMAL, Dolby NR switch to OFF, and
Recording Level control to maximum,

. Apply 400HZ signal into LINE IN lL-ch) from the

audio generator. Adjust output of the audio generator
so that line output level is 58mV. Record this signals

Change the frequency of audio generator to 10,000
Hz (with the input at the same level). Then record the
signal.

ENGLISH

HMO-82

Adjust potentiometer VR103 on the main p»c board
(Fig, 2), by recording and playing back, until outputs
for 10,000H2 and 400HZ signals reach the same level,

3. Carry out this adjustment for R-ch, using potentio»

meter VR104 on the main p-c board.

C. Playback Level Adjustment

1.

Set Tape Selector to NORMAL and Dolby N R switch
to OFF. Connect the AC voltmeter to LINE OUT ter»
minalsl

l Play back test tape LOT-7001 (or equivalent), and

adjust potentiometer VR101 (VR102 for R-ch) on
the main p-c board (Fig. 2) so that the AC voltmeter
reads 580mV.

D. Recording Level Adjustment

1.

Set Tape Selector to NORMAL, Dolby NR switch to
OFF and Recording Level Control to maximum. Con-
nect the audio generator to LINE IN and AC volt-
meter and oscilloscope to LINE OUT.

. Insert normal tape (TDK AD tape) into the deck, and

press REC, PLAY and PAUSE buttons. Apply 400Hz
(sine wave) signal from the audio generator. Adjust
output of the audio generator so that the AC volt-
meter reads 184mV (ire, 580mV - 10dB).

. Record this signal. Check to see that the AC volt»

meter reads 184mV when the recorded tape is played
back

. If recording and playback levels differ from each

other, repeat step 3 until the two levels become
almost equal, by adjusting potentiometer VR105
(VR-106 for R-ch) on the main p-c board while re-
cording (Fig, 2).

PB LEVEL

L-CH CAL

VRIOI

RECIPE AMP PCB
(TOP VIEW)

BIAS ADJ
VRIO3 |:]
L I]
@ REC! PB SW -
l D
VRlOlo VRtCS
L»CH
REC LEVEL
vmoz R-CH
R-CH VRIOS
PB LEVEL CAL
Fig. 2