Motorola a 7 mv service manual

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Sapphire VIII stereo tape player

MOTOROLA

GENERAL INFORMATION

These 12 Volt models are designed
for custom installation in the
following Vehicles:

Model A7MVF - Volkswagen Fast-
back

Model A7MVG - Karmann-Ghia

Model A7MVS - Volkswagen Square-
back

Model A7MVT - VolkswagenTrans-
porter

Model A7MVW ~ Volkswagen Sedan

SERVICE STATION
PROCEDURE

1. A defective in-guarantee tape/
radio unit must be accompanied by
the Customer's Guarantee Policy
Tag. This tag must be properly
filled in by the Volkswagen dealer
at the time of the unit purchase.
Accept as guarantee repairs only
those units within the 1 year or

with
all-transistor radio

l

\

for free replacement supportedwith
the defective parts return tag which
you are now using.

5. Only those service shops author-
ized by their Motorola Distributor
can perform guarantee repairs on a
no-charge basis to the customer. If
you are not already authorized as a
Motorola Service Station and you are
interested in handling this service,
please contact your Motorola Dis-
tributor for complete details.

OPERATING INSTRUCTIONS
OPERATION

TO PLAY TAPES - Turn unit on by
rotating the on-off and volume con-
trol to the right. Select a tape
cartridge and insert it - label side
up and open end first - into the tape
slot. Push the cartridge in until it
is firmly seated: (THISIS IMPORT-
ANT.) The tape cartridge will now
play, in succession, all four chan-
nels. Adjust volume, tone and bal-
ance as required.
NOTE: Inserting

tape cartridge

VOLKSWAGEN
A7MV SERIES

I M service manua

stored in a cool, clean and dryplace,
out of the rays of the sun and with
the open (tape) end down.

SERVICE NOTES
GENERAL SERVICE NOTES

1. POLARITY - WHEN SERVICING
THIS UNIT, THE "A" LEAD MUST
BE CONNECTED TO THE POSITIVE
SIDE OF POWER SOURCE. IF CON-
NECTED OTHERWISE, RECEIVER
WILL NOT OPERATE AND
DAMAGE TO COMPONENTS MAY
RESULT.

S'. 2 W . i . . . .
g 3 E 12,000 nulest (whiclhedwer Ticcurs into fslot automatically switchesthis 2. FOWER SUPPLY REQUIRE
; < a m) 313. ee {183° He ft mt 9 AM Ta 1° °Perat1°nt°taPe MENTS _ It is preferable to use a
g E > rnoval 2r re-ipsca 2:01;; his 113:; operation. storage battery (without a battery
' 3 x E 15 cus omari y pe r . y charger) in place of a battery elim-
d N Volkswagen dealer and 15 ct TO OPERATE AM RADIO ' Tape inator If a battery eliminator is
g g < covered by this guarantee. Also cartridge mug: be pulled out com- used .it must be well filtered and
E the remOVal 0f motor DOiSe, tire pletely or at least 1" from its seated regulated
5 static, electrical interference, position before radio will operate. '
faulty installationsdand daerial re- Turn unit on by rotating the on~off 3. OUTPUT LOAD _ Always operate
3 pairs are not consi ere as guar- and volume control to the. right, this receiver with an output load
A antee repairs and, therefore, tex- Tune in desired station with.the across each of the two channels;
.3 penses related to such services smaller knob located to the right either 8 ohm speakers or 8 ohm, 5
\ g a should be handled by the car dealer. 3:11:11: $3553.53; :dJsiit goluxne, watt resistive loads can be used,
__ .a n e s e .
i 5 IE 2, Fill in MotorolaGuarantee Labor q 4 TRANSISTOR REPLACEMENT _
g: g Claim, Part NumbzrpoiiéooiéAiO: NOTE: driller: tthe tape cartrlltlige is When replacing a transistor other
, .gg .2 and mail Green an 1 copies 0. re:nov:ti rfim he'Eapxe slpt, t egmit than a power or regulator transis-
~ E . au om. ca y SW: c 35 rom .ape tor, grasp the transistor leads be-
: E Motorola Guarantee SerVice operation to AM radio operationr tween transistor body and plated
k ,3 Motorola Automotive Products, Inc. chassis board with a pair of long
E E 9401 West Grand Avenue CAUTION: The tape cartridge nose pliers to prevent excessive
.5 Franklin Park, Illinois. should always be .pulled out com- heating of transistor body during
f g pletely or approximately 1" from soldering operation
Us, 3. The yellow copy of the Motorola the seated (play) position before "
Guarantee Labor Claim is to be re- leaving car or turning unit off. 5 POWER AND REGULATOR
tamed by the authorized serv1ce TRANSISTOR REPLACEMENT -

station for his files,

4, Defective parts for guarantee re-
pairs made on this model are to be
sent to your Motorola Distributor

TAPE CARTRIDGE CARE

To assure maximum life and noise
free operation, tapes should be

When replacing a power or regula-
tor transistor, be sure to:

A. Use the transistor specified
in the Replacement Parts List.

MANUAL 68P43IOIAI3

MOTOROLA INC.
PART No. 68P43IOIA'I3 2-67

9401 WEST GRAND AVENUE, FRANKLIN PARK, ILLINOIS
PRICE 50 CENTS COPYRIGHT T967 BY MOTOROLA INC. - PRINTED IN U.S.A.

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B. Coat both sides of transistor
insulator with DC-4 grease
(Motorola Part No. 11M490487)
to insure proper heat dissipation

C. Securely and evenly tighten
the transistor mounting screws.

6. GAININQ ACCESS TO THE
PLATED BOARDS - Remove top and
bottom covers and refer to photo.

Tape Pre-Amp Plated Board - To
remove this board for servicing,
merely unsolder the chassis ground
lead (see photo), bend the copper
retaining clip and lift up the chassis
to a more serviceable position.

Audio Amplifier Plated Board - To
gain accesl to the bottom side of
this board, remove the two (2)
screws at the front side of the radio
(see photo). To remove the board
for servicing. remove the screw
from the mounting bracket. unsolder
the tabs, straighten the tabs, then
remove the mounting bracket.

AM Radio Plated Board - To service
this board, remove the 5 side cover
mounting screws, bend the copper
retaining clip so that the side cover
can be removed from this board,

7. OUTPUT TRANSFORMER AND
FILTER CHOKE REPLACEMENT -
Remove 5 screws, 2 at front and 3
at rear (see photo); also remove
ground leads from control and pull
out wraparound far enough so that
transformer or filter choke can be
removed.

8. TAPE CARTRIDGES - Befone
servicing the tape player portion of
this unit, always check for the pos-
sibility of a defective pre-recorded
tape cartridge, particularily if one
is returned with the unit. This
should be done by substituting the
tape cartridge with one that in known
to be good.

9. TAPE HEAD AND CAPSTAN
CLEANING - One major cause of
improper tape player operation is
oxide build-up on the head and cap-
stan. During normal operation,
some iron oxide particles are
loosened from the tape and buildup.
This accumulation of oxide can cause
poor playback and up and down tape
travel. The head and capstan should
be cleaned whenever the unit is ser-
viced and this can be done either in
the car or on the service bench. To
clean the head and capstan, use a
cotton swab moistened with head
cleaner or isopropyl alcohol, then
wipe dry.

(CAUTION should be exercisedwhen
cleaning playback head to prevent
getting cleaner on any plastic parts.)

AM RADIO
PLATED BOARD

RETAINING REMOVE
CLIP MOUNTING

BRACKET AUDIO
AMPLIFIER
SC'EW PLATED

.7 a BOARD

MOUNTING

REMOVE WIRES
FROM
WRAPAROUND

TAPE FEE-AMP

LEAD

CHASSIS GROUND

TA PE P RE-AMP

PLATED BOARD RETAINING CLIP

GAINING ACCESS TO PLATED BOARDS, FILTER CHOKE AND OUTPUT TRANSFORMERS

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TAPE HEAD 8: CAPSTAN CLEANING

10. HEAD DEMAGNETIZJNG - Do
not use magnetized screwdrivers
and wrenches near the head since
these can magnetize the head. The
head may also, after a long period
of time, acquire some residual mag-

netism. A head that is magnetized
will show a definite loss of high

frequency response and an increase

in noise level. Use a commercially
available head demagnetizer, fol-
lowing instructions included with

the unit to demagnetize the head.

11. HEAD REPLACEMENT - The
location of the tape head withrespect
to its mounting bracket is very

, Critical; for this reason, replace-

ment heads are supplied already
secured to their mounting bracket
and positioned correctly at the fac-
tory. When replacing a head, re-
member to replace it as an assem-
bly, that is, remove the defective
head and bracket and replace it with
the new head and bracket assembly.

If for some reason the location of
the head has changed (due to aloose
mounting screw, etc.), position it as
shown in Ill-lead Positioning Adjust-
ment".