Motorola mp 50 er service manual

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MANUAL 68P63011A90

MODEL MP50EH, ER
CHASSIS OHS-200

phonograph

MOTOROLA service manual-I

GENERAL
INFORMATION

Portable monaural phonograph.

ELECTRICAL SPECIFICATIONS

Power Supply: 120 volts, 60 cycle AC
only.

Power Consumption: 20 watts.

SERVICE NOTES

Ll N E CORD REVERSAL - For
minimum hum, Insert line cord plug in
both positions. Leave it in the position
that provides least hum.

W

i o o
g 33:18. OPERATING AMPLIFIER WlTH Mada/MFMEH'EH
E 3 a a LOAD - Always operate the amplifier
8 8 g chassis with an output load (either the
g; 3 speakers or a 16 ohm, 1 watt resistive
.I _' § load).
g III 0
g CHASSIS REMOVAL
1. Remove two (2) screws from each
side of cabinet. NOTE: Two (2) 2. Lift Changer up from cabinet. cartridge.
plastic spacers between side of cabinet
and the escutcheon. CARTRIDGE REMOVAL 4. To replace, insert tab on rear of
cartridge into slot of cartridge holder;
2. Lift control escutcheon up from 1. Lift tone arm to a vertical position. front of cartridge WI then snap in
cabinet. place.
2. Pry front of cartridge holder away
§ RECORD CHANGER REMOVAL from cartridge. Carefully remove RELATED PUBLICATION
g. cartridge. REFERENCE
3 1. Remove four (4) screws "A" from
51 top of changer. 3. Disconnect two leads from rear of Record Changer ......... BSRlOO

MOTOROLA INC. 9401 WEST GRAND AVENUE, FRANKLIN PARK,
PART No. espeam 1A90 1-69 PRICE 15 CENTS

l LLl N O l S
COPYRIGHT 1969 MOTOROLA INC. . PRINTED IN U.s.A.

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RECORD CHANGER INFORMATION

SUGGESTIONS

lf tone arm stays on rest as record
turns, push starting lever fully to REJ.
If lever is turned to OFF during
changing cycle, control arm will lock;
release by rotating turntable clockwise
by hand.

ADJUSTMENTS ( See Illustration )

This changer has been accurately
ore-adjusted for correct stylus landing,
stylus pressure and tone arm height. If
new adjustments should ever be
needed, make them with a 12" record;
then position will be correct for all
sizes.

STYLUS LANDING ...Adjust with
landing screw to start 1/8" from
record edge.

Spindle Control Arm

Turntable

Starting

Speed Tone Stylus
Selector Arm Selector Lever
ToneArm
Height
Spring
Anchor
(Stylus
Pressure
Adjustment)

Balance Spring
Stylus Landing Screw

TONE ARM HEIGHT . ..To raise,
hold plastic nut firmly and turn screw
head by hand counter-clockwise; to
lower, turn screw head clockwise.
Adiust stylus to clear a full stack of
records by 1/8".

STYLUS PRESSURE . ..To increase
stylus pressure, lenghten balance
spring position in spring anchor. To

decrease pressure, shorten balance

spring position in spring anchor.

TO USE 45 RPM SPINDLE . . . Place
spindle over the record changer spindle
with arrow on the side pointing
toward the speed selector knob.

STYLUS REPLACEMENT

1. Lift tone arm up so stylus and
cartridge are visible.

2. Rotate stylus to the 78 RPM
position.

3. Grasp stylus with fingers and with a
gentle motion, twist stylus so the tip

STYLUS

'V" Di EARTRIUSK

end raises up and the rear portion
snaps out from under the retaining
clip.

4. Hold new stylus with fingers and
snap rear portion of stylus under
retaining clip; be sure tip of stylus
rests in "V" of cartridge.

REPLACEMENT STYLUS IS
NUMBER: 92-20088.

....
AF ERYRIDEE

STVlUS TATE
ll! 13 IPII PfiSITlllll

IiUAIlliIlE CUP

CAUTION: lZflV AC

exuased in snme sets.
m with we In
Hate shock hexard

TURN V
TABLE

SPACER

cuAssxs
RETAINING
sEaEws (2) i

TUNE ARM

AD MOTOR

- l

45
SPINDLE
SPACER
CHASSIS

RETAINING
scazws l2)

Service Information