Motorola tm 527 a service manual

Page 1

I MOTOROLA

GENERAL INFORMATION

Universal automotive type all-
transistor superheterodyne AM
radio for standard broadcast re-
ception; operates from 12 volt nega-
tive or positive ground system (by
simply re~positioning a polarity re-
versing plug on the radio). This re-
ceiver contains a plated chassis
board, 6 transistors, 3 diodes and
an external 8 ohm speaker.

This radio is of the compact under-
dash type. In-dash installations,
however, can be made in many cars
with the use of trimplate kits Ali-223
or KM3ST. Special knobs are de-
signed to give all installations a
custom look. The tone knob and the
dummy knob are reversible. For
in-dash installations, the knob is
used "backwards and provides a
flush fit. For under-dash installs»
tions, the knob is used I*face-up"
and fills the extra space where the
dash would be.

SERVICE NOTES

1. Make certain the A leadis con-
nected properly to power source,
i. e., check position of polarity re-
versing plug, otherwise damage to
receiver may result. If a battery
eliminator is used as apower source
in place of a battery, it mustbe well
filtered and regulated.

auto radio

MANUAL 68P64994A69

MODEL TM527A

2. When replacing a power output
transistor, remember to use the
transistor specified inthe parts list;
coat both sides of the transistor in-
sulator with DC-4 grease (Motorola
Part No. llM490487) and securely
tighten the transistor mounting
screws. When replacing all other
transistors, use long.nose pliers as
a heat sink, i. e., grasp transistor
leads close to transistor base with
the pliers to dissipate heat while
soldering.

3, The plated chassis used in this
receiver has plating on both sides;
the exposed side (opposite compo-
nents) contains the actual circuitry
while the plating on the component
side contains primarily 3- points.

Servicing techniques applicable to

this model can be found in the
following Motorola publications:
Profitable Transistor Radio Ser-
vicing" (Motorola Part Number
68P60011A53) and A Discussion Of
Transistorized Car Radios"
(Motorola Part No, 68P64980A5l).

4. REAR SPEAKER - The KMBS
(6" x 9" - 8 ohm withfader control)
rear speaker kit can be used with
this radio.

TO SET PUSHBUTTONS

Unlock pushbutton by pulling it out
about 1/2H forward of its normal
position, Tune in station and lock
the pushbutton to the station by
pushing it in firmly.

0 <

E 2; MOTOROLA AUTO RADIO WARRANTY SERVICE STATION PROCEDURE

3 E l. AMotorola Branded Modelis one booklet must be filled in by the pink and green copies to your

3 I- that has the Motorola name and is selliig dealer at the time of retail Motorola Distributor for payment,

E d distributed to dealers through the sale. The Customers Car Radio The yellow copy is to be retained in

_. Q Motorola Distributor. Guarantee and Service Bookletmust the Service Station file.

; 2 show that the radio is within the

3 2. These models are guaranteedfor guarantee period to be repaired 5 Defective parts for uarantee re-

: all parts and labor, including re- under the Motorola Auto Radio airs made are to begsent to our
moval and re-installation (R a R), Guarantee. IMotorola Distributor for {Reyna}

g for a period Of two years from the i placement supported with the defec-

,-€ date of purchase. The follow1ng re- 4-, To obtain your labor allowance tive parts return tag Part Number

5 pairs are not covered under this for the servicing of the customers 54P591808

Q guarantee: the elimination ofmotor in-guarantee set, fill inthe Motorola

E noise, tire static, electrical inter- Guarantee Labor Claim, Part No.

ference and faulty installation,
Charges for these repairs are to be
paid by the customer.

3. Before performing a guarantee
repair on a Motorola Branded Auto
Radio, you must first receive the
Customer's Car Radio Guarantee
and Service Booklet. The installa-
tion and model information on the

68P60016A30. If you perform a
R 3: R service. you are entitled to
the R 8: R allowance. If you only
repair the radio without R & R ser-
vice, you are entitled to the labor
allowance. However, ifyouperform
both R & R and the repair, then be
sure to indicate both on your claim
form for both allowances. After the
form has been filled in, mail the

6, Only those service stations auth-
orized by their Motorola Distributor
can perform repairs within the
guarantee period on a no-charge
basis to the customer. If you are
not an Authorized Motorola Auto
Radio Service Station and you are
interested in handling this service,
please Contact your Motorola Dis-
tributor for complete details.

MOTOROLA INC.
PART No. 63P64994A69 4-67

9401 WEST GRAND AVENUE, FRANKLIN PARK.
PRlCE 20 CENTS

I LL! N O I S
COPYRIGHT 1967 BY MOTOROLA INC. - PRINTED IN U.S.A.

Page 2

ALIGNMENT

Connect an output meter across the speaker voice coil. Set volume to maximum and tone to treble. Atten-
uate signalgenerator output to maintain 1 watt (2.83 volts across an 8 ohm load) on output meter at all times.

GENERATOR
GENERATOR FREQUENCY
STEP CONNECTION (400 cycle 30% mod) TUNER SET TO ADJUST REMARKS
IF ALIGNMENT
1. To collector of 262.5Kc Hi end stop 1, Z, 3 Adjust for maximum,
RF amp thru 8: 4
. lmf 8: chassis
RF ALIGNMENT
2. Antenna recept- lblOKc Hi and stop 5, 6, 7 Adjust for maximum.
acle thru dummy & 8
(see Figure)
NOTE: Do not perform Steps 3, 4, 5 and 6 unless the tuner has been tampered with or associated compo-
nents have been replaced. Remove the escutcheonto expose core screws. Before proceeding with
Step 3, back the tuning cores as far as possible out of the coils to eliminate their effect on trimmer
adjustments.
3, Antenna recept- 16 lOKc Hi end stop 5, 6, 7 Adjust for maximum,
acle thru dummy 8.: 8
(see Figure)
4. " IZOOKC Tuner carriage 9, 10, 11 Adjust for maximum.
.285" from hi & 12
end stop
5, H 1610Kc Hi end stop 5, 6, 7 Adjust for maximum.
8: 8
6. Repeat Steps 4 and 5 until no further increase: Step 5 should be last step. Then, cement core

screws in place.

ANTENNA T RIMME R

7, ...

RECEPT

- - - We ak station 8 Adjust for maximum with
around 1400Kc radio installed in car and
antenna fully extended.
PLUG TO FIT RECEIVER
_____ _ ANTENNA RECEPTACLE
l- _ I
.J 60?? TO REGIVER
105mm. -- --l -. mmm
F R ONT G£NERATOR 1"1 P? I RECEPTACLE
: l I METAL SHIYETDCCAE'I)
__ ____1 MUSTBEA A H
L To PLUG

BOT TOP BOT TOP

ALIGNMENT LOCATION DETAIL

DUMMY ANTENNA DETAIL

IF ALIGNMENT DETAIL