Motorola mtd 163 j service manual

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E tape player MANUAL 68P63012A16
3 MODEL CP500EN
z . TAPE DECK IVITD -153J

my

CHASSIS CHS-3600

service manual

MOTOROLA

MOTOROLA INC.

PART NO. 68P63012A16

GENERAL
INFORMATION

Model CPSODF is a dual entertainment
unit. It plays back prerecorded stereo
8-track tape cartridges at 3% I.P.S. It

TAPE SLOT

will also play 7", 10" and 12" records.
Speed may be adjusted for 16, 33. 45
_, or 78 RPM.
{'3
E
c] g ELECTRICAL SPECIFICATIONS
(D
E a Power Supply: 120 volts AC 60 cycle,
'0 I 30 Watts.
2: o
m
3 {7) Power Output: 4 watts M.P.O,
g 2 OPERATING AMPLIFIER WITH phono position.
< 5 Controls: Balance, volume, tone, LOAD rAlways operate the amplifier
'- track selector and tape/phone switch. with an output load (either the TO PLAY TAPES _ . . Insert tape
speakers or an 8 ohm, 5 watt resistive firmly into slot, label side up. The
Power Supply: Transformer full wave. loadi across each channel. player will turn on automatically.
1 Depress the TAPE pushbutton on the
Transistor Complement: 16 SPEAKER PHASING- Refer to the control panel and set the amplifier
transistors and 4 diodes. schematic diagram. controls to the desired levels. The tape
player uses a pre-recorded (8 track)
SERVICE NOTES tape cartridge. It automatically
OPERATION changes channels at the end of each
LIN E CORD REVERSAL - For Note: Make certain that the record recording or it can be changed
3 5 minimum hum, insert line cord plug in changer is turned off at the changer manually. To select another or desired
fi 3 both positions. Leave it in the position when playing tape; otherwise, changer track, depress and release track
8 E that provides minimum hum. will run when phone/tape switch is in selector until desired track is selected.
as o
E _l
8 3 TRACK TAPE ON
.4 O
3 E SELECTOR %
<2: TAPE CARTRIDGE %@
2 LABEL SIDE UP /@
aTONE
BALANCE
VOLUME
E TAPE "OFF" -
s"; PHONO "ON":
g UNIT OFF (REJON-OFF

CONTROL 0N RECORD
CHANGER MUST BE IN

NOTE: PULL OUT TAPE CARTRIDGE OFF POSITION).

3-69

APPROXIMATELY ONE INCH
WHEN NOT IN USE

9401 WEST GRAND AVENUE, FRANKLIN PARK.

PRICE 35 CENTS

I LLI N 0 l S
COPYRIGHT 1969 BY MOTOROLA INC. - PRINTED IN USA.

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SERVICE INFORMATION AND ADJUSTMENTS

TAPE CARTRIDGE CARE

To assure maximum lite and noise free
operation, tapes should be stored in a
cool, clean and dry place, out of the
rays of the sun and with the open
(tape end) down.

CHANNEL SWITCHING

Since the prerecorded tape has four
dual tracks (8 single tracks) and since
the tape head can only use two tracks
at a time, a means is provided to allow
the head to be moved up or down to
one of four different p05itions with
respect to the tape. The sequence of
head movement is as follows:

Tracksl &5,2&6,3&7,4&8,1&
5, etc. (see detail).

The positioning of the head can be
accomplished either manually or
automatically. Manual positioning is
accomplished whenever the track
selector switch (E5) is pushed in and
released. The shorting of this switch
causes the spring loaded shaft on the
solenoid E3 to pull in for an instant;
when the shaft returns to its original
position, it actuates the ratchet end of
the cam and shaft assembly to detent
to its next position. In contact with

TAPE GUIDE
BRACKET

TAPE

DIRECTION OF
TAPE TRAVEL

TRACK SWITCH

CONDUCTIVE
STRIP

FLYWHEEL

TRACK 1
TRWZ
TRACK 3
TRACK 4
TRACK 5
TRACK b
TRACK 7
TRACK a

TRANSFER
FIN

Figure

the other end of the cam and shaft
assembly (irregularily shaped at that
end) is the tape head transfer pin
(located beneath the head) which
moves the head up or down.

Movement of the head to the next
dual track will be done automatically
by the tape itself when the end of a
dual track is reached. The prerecorded
tape has, at the end of the recorded
programs, a strip of conductive tape
which shorts out switch E4 which is in
direct contact with the tape at all
times. This starts the same sequence of
action which occurred when the track
selector switch was pushed in as
described above (see detail).

TAPE PLAYER SERVICE NOTES

PROPER DRlVE BELT
lNSTALLATlON . Make certain that
whenever the motor drive belt is
removed, the rough surface of the
drive belt is on the inside when the
belt is reinstalled later. The rough
surface of the belt must drive the
flywheel. On belts having a stripe,
install the belt with the stripe on the
outside,

As part of a regular cleaning
procedure, clean the motor pully and
flywheel drive surfaces with isopropyl

RUBBER PRESSURE ROLLER
(INSIDE TAPE CARTRIDGE

TAPE HEAD (SHOWN
USING TRACKS l & 5

CAM

DRIVE BELT

7 - Tape Drive and Head Positioning

alcohol.

TAPE CARTRIDGES . Before
servicing the tape player portion of
this unit, always check for the
possibility of a defective prerecorded
tape cartridge, particularly if one is
returned with the unit. This should be
done by substituting the tape cartridge
with one that is known to be good,

TAPE HEAD CLEANING

One major cause of improper tape
player operation (regardless of type of
player) is oxide buildaup on the head.
This accumulation of oxide can cause
poor playback and some up and down
tape travel. The head, track switch and
drive capstan should be cleaned
whenever the unit is serviced and this
can be done either in the home or on
the service bench. To clean the head,
use a cotton swab as shown in Figure 2
moistened with head cleaner or
isopropyl alcohol, then wipe dry. Also
clean leaf contacts on track switch
(E2).

CAUTlON should be exercised when
cleaning playback head to prevent
getting cleaner on any plastic parts. A
commercial head cleaning tape may
also be used.

CAPSTAN

MICRO-SWITCH
TING ARM

PLUNGER END
STOP SCREW

SOLENOID