Rotel RP 840 Service Manual
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Extracted text from Rotel RP 840 Service Manual (Ocr-read)
Page 1
Quainy
RDTEI-
Technical
Mama
TABLE OF CONTENTS
Specifications ............................. 1
Adiustment .............................. 2
Troubleshooting. . 2
Packing/Unpacking. . 5
Disassembly Diagram. 6
Schematic Diagram .......................... 8
Parts List .............................. 8
P-c Board Diagrams ........................ 9
SPECIFICATIONS
Motor .............. FG servo 2-phase, 8-pole
coreless motor
Drive System ......... Direct-drive
Speeds ............. 334/3 and 45 rpm
Wow and Flutter , . . .Less than 0.03%(WRMS)
Signairto-Naise Ratio ..... Better than 60dB (lEC-B)
Better than 70dB (DIN-B)
Platter ............. Aluminum diecast (318mm diameter
with strobe pattern underneath)
TONEARM
Type .............. Static-balanced straight pipe arm,
oil-damped cueing device, direct-
readout stylus gauge counter.
weight, anti-skating device.
Overhang ............ 16mm
Tracking Error ......... +2.5° to 714°
Suitable Cartridge Weight . Ag to 89
Suitable Stylus Pressure , . 0.759 to 39
MISCELLANEOUS
Power Requirement ...... 120V (60Hz) or 220/240V (EOHZ)
Power Consumption ..... 6 watts (max.)
Dimensions (overall) ..... 430 (W) x 133 (H) x 388 (D) mm
16-15/16" x 5-1/4" X15>9l32u
Weight (net) .......... 4.6kg/10.12 lbs.
CARTRIDGE: ROTEL ZRC-I-OI (OPTIONAL)
Type .............. Moving Magnet type
Frequency Response . .
Output Voltage . . .
Channel Separation. .
Load impedance , . . .47 kohms
Dynamic Compliance , 8 x 106 cm/dyne
Stylus Force Range ...... 1.5 to 2.59
, .20 to 25,000HZ
, .3mv at 1kHz. 5cm/sec.
.26d8 at 1kHz
Suitable Stylus Force ..... 2.5g
Stylus Tip ........... 0.5 mil diamond (round)
Cartridge Weight ....... 5.79
Replacement Stylus Tip . , .FiN-1-01 (round)
0 Specifications subiect to change for improvement without prior
notice.
THE RDTEL CD.. LTD.
Serial No. Beginning
2020001
STEREO SEMI-AUTOMATIC
DIRECT DRIVE TURNTABLE
RP-84O
TABLE DES MATIERES
Caractéristiques ............................ 1
Réglages ...............
Guide de dépannage
Em ballage/déballage
Schema de démontage '.
Diagramme schématique ....................... 8
Liste des pieces ............................ 8
Diagrammes des plaquettes des circuits imprimés ......... 9
CARACTERISTIOU ES
Moteur ................ Servomoteur F6 2 phases,
8 poles, sans noyau
Entrainemem ............ Entrainement direct
Vitesses ................ 33.3 at 45mm
Pleu rage et scintillement
.Inférieurs a 0.03% (WRMS)
Rapport signal/bruit ........ Mieux que 60dB (lEC-B)
Mieux que 70dB (DIN-B)
Plateau ................ Moulage en aluminum (diametre
ERAS DE LECTURE
Type .................
Dépassement .............
Erreur de piste ............
Poids de cellule admissible .....
Pression de pointe admissible . .
DIVERS
Alimentation .....
Consommation . . . . . .
Dimensions (hors-tout) .......
Poids (net) ..............
318mm, mire stroboscopique
inferieure)
Bras tubulaire droit a équilibrage
statique, dispositif de recherche
oléo-amorti, jauge contrepoids
de pointe a lecture directe,
anti-skatingl
16mm
+25 5 71,4
4989
0,759-39
4120V (GOHZ). 220/240V (SDHZ)
, .6 watts (max.)
430 (L) x 133 (H) x 388 (P)mm
4,6kg
CELLULE: ROTEL ZRC-1-01 (EN OPTION)
Type .................
Bande passante ...........
Tension de sortie ..........
separation des canaux .......
Impedance de charge ........
Elasticité dynamique , . .
Gamme d'appui de pointe .....
Appui de pointe adequatl
Points .........
Poids de cellule ..... . . ,
Type de pointe (remplacemant). .
o Specifications sujettes a modif
d'amélioration.
Type a aimant mobile
20 a 25.000 Hz
3mV a1kHz,5cm/sec,
26dE a 1kHz
47kohms
, .8x 10'5 cm/dyne
1,5 é 2,59
2,59
. .Diamant, 0,5 mil. (rond)
5,79
RN-l-Oi (ronde)
ications sans préavis a des fins
(73678 OHOKAYAMA, MEGURO-KU, TOKYO 152, JAPAN
BLDG, NO. 305, SECTION 3,
2ND FLOOR, EVERGLORY
RDTEL ELECTRONICS CO" I_'T'D. NANKING 5 ROAD, TNPEL TAIWAN, Fugue OF CHINA
RDTEI- OF AMERICA. INC.
HOTEL HI FI LIMITED.
13528 SO. NORMANDIE, GARDENA, CALlFl 90249, USA.
2-4 ERICA ROAD, STACEY
BUSHES, MILTON KEYN ES,
BUCKINGHAMSHIHE, ENGLAND
Page 2
ENGLISH
Adjustment
AUTO-RETURN POINT ADJUSTMENT
Auto-return Point ls Slightly Deviated.
1. If stylus leaves the disk after passing the desig-
nated spot, tu m the adjusting screw clockwise.
2. If stylus leaves the disk before reaching the desig-
nated spot, turn the adjusting screw counter-
clockwise.
N.B. Auto-return function is normal when rejection
point is within a range designated on the test record
ES-1008 (NEC).
Auto-return Point ls Largely Deviated.
1. Screw in the adjusting screw midway.
2. Loosen two set-screws on restore lever. Position
the lever so that the distance between the actuat-
ing arm and the tip of restore lever is about 7mm.
Fix the lever only provisionally by lightely tight-
ening the set-screws. Then, make adjustment as
described in phase A above.
3. Secure the set-screws firmly after completing
adjustment.
Adjusting screw
\ Fixing screw
\ Fig. 1
ADJUSTMENT 0F TONE ARM HEIGHT IN
RETURN ACTION
Tone arm, when returning automatically to rest,
normally points slightly upward (headshell is slight-
ly higher than level). If the inclination of tone arm
is excessive, either upward or downward, follow the
procedures below.
1. Lift the tone arm from its rest and place it on the
top of the elevation arm. Press reject button.
Gently rotate the turntable clockwise by hand,
and the elevation arm will begin to rise gradually.
Stop turning turntable when elevation arm stops
rising.
2. Maintaining this state, rotate the adjusting screw
(Fig. 2) so that distance between stylus tip and
disk surface is about 6mm: turn the screw coun-
terclockwise to raise the position of stylus tip,
and clockwise to lower it.
3. After completing adjustment, gently rotate the
turntable clockwise again to lower the elevation
arm to the original position.
N. B. Distance between stylus tip and record surface
should be within a range from 5 to 10mm. If the
height of stylus tip is inadequate, it may scratch the
record, and if too large, it may not come in contact
with the record.
Adjusting screw
Elevation arm
Ill. SPEED ADJUSTMENT
1. Set the speed control to mid-position.
2. Adjust by turning the potentiometer on the
motor p-c board to obtain the specified speed
(the stroboscopic marks on the rim will stand
still when correct speed is obtained). Use poten-
tiometer VRl for 45 rpm adjustment and VR2
for 331/3 rpm.
O
O@ vm 45
O VR2 331/3
0 D
Fig. 3
llll
UDUUUU
Troubleshooting Guide
A. Turntable does not rotate even when tone arm is po-
sitioned over the lead groove.
1. Power switch is faulty.
2. Power cord is faulty.
3. Motor is faulty.
Tone arm does not return to its rest when reject
button is pressed.
1. Movement of actuating arm is incorrect.
2. Return gear (R gear) and turntable gear (TT gear)
are not properly engaged.
a) Mesh between R gear and TT gear is improper.
b) Gear(s) is worn out.
3. Protruded portion of TT gear is worn out.
Tone arm returns to its rest before reaching the end
of play.
1. Restore-lever fitting position is incorrect.
a) Distance between restore lever and actuating
arm is too small (Refer to section I for
proper adjustment.)
N.B. The same symptom may be seen when
the unit is tilted .to the left (as you see the
front of the unit).
Tone arm does not return to its rest at the end of
play.
1, Restore-lever fitting position is incorrect.
a) Distance between restore lever and actuating
arm is too large. (Refer to section | for
proper adjustment.)
1