Denon DRA 435R Service Manual

Page 1

N) E . '

SERVICE MANUAL
MODEL DEA-435:!

Serial No. 25551 and after

MODEL DEA-335R

Serial No. 38551 and after

V -~~. AM-FM STEREO RECEIVER

ORA-435R R04 29 BRA-335R Rc-129A
TABLE OF CONTENTS

OPERATING INSTRUCTIONS ............................................. 2 ~ 11
REMOVAL OF EACH SECTION ............................................ 12, 13
METHOD OF ADJUSTMENTS .......................... . . 14, 15
CONNECTION DIAGRAM OF MEASURING INSTRUMENTS ...................... 16
; BLOCK/LEVEL DIAGRAM (BRA-435R) ....................................... 17
BLOCK/LEVEL DIAGRAM (ORA-335R) .............. 17
, PARTS LIST OF EXPLODED VIEW ....................................... 1a
EXPLODED VIEW OF CHASSIS AND CABINET ...... 19
3 NOTE ON PARTS LIST .................................... 20
PRINTED WIRING BOARD PARTS LIST ............................... 20 ~ 24
; PRINTED WIRING BOARD PATTERNS 25 ~27
r 1U-2345A MAIN UNIT (DRA-435R) ...... 25
> 1U-2344A MAIN UNIT (ORA-335R) .................................. 26
1U-2346A MI-COM UNIT (DRA-435R/335R) ........................... 27
1U-2347A TUNER UNIT (ORA-435RI335R) ............... 27
1U-2848A VIDEO UNIT (ORA-435R) ...................................... 27
SEMICONDUCTORS ........................... , ................... 28, 29
WIRING DIAGRAM .................................... so
SCHEMATIC DIAGRAM (for BRA-485R) .............................. 31

SCHEMATIC DIAGRAM (for BRA-335R) ...................................... 32 A;

' NIPPON COLUMBIA CO.. LTD.

Page 2

- DRA-435FI/335H

RISK OF ELECTRIC SHOCK

DO NOT OPEN

SERVICE PERSONNEL.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (0R BACK). NO USER SERVICE-
ABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED

The lightning flash with arrowhead symbol, within an equilateral triangle,
is intended to alert the user to the presence of uninsulated "dangerous
voltage" within the product's enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.

. The exclamation point within an equilateral triangle is intended to alert the
_ user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE T0 RAIN OR MOISTURE.

CAUTION

ATTENTION

TO PREVENT ELECTRIC SHOCK DO NOT USE THIS (POLA-
RIZED) PLUG WITH AN EXTENSION CORD, RECEPTACLE OR
OTHER OUTLET UNLESS THE BLADES CAN BE FULLY IN-
SERTED TO PREVENT BLADE EXPOSURE.

POUR PREVENIR LES CHOCS ELECTRIOUES NE PAS UTlLlSER
CETTE FICHE POLARlSEE AVEC UN PROLONGATEUR UNE
PRlSE DE COURANT 0U UNE AUTRE SORTIE DE COURANT.
SAUF SI LES LAMES PEUVENT ETRE INSEREES A FOND SANS
EN LAISSER AUCUNE PARTIE A DECOUVERT.

SAFETY INSTRUCTIONS

1. Read Instructions - All the safety and operating
instructions should be read before the appliance is
operated.

2. Retain Instructions - The safety and operating
instructions should be retained for future reference.

3. Heed Warnings - All warnings on the appliance and
in the operating instructions should be adhered to.

4. Follow Instructions - All operating and use instruc-
tions should be followed.

5. Water and Moisture - The appliance should not be
used near water - for example, near a bathtub,
washbowl, kitchen sink, laundry tub, in a wet
basement, or near a swimming pool, and the like,

6. Carts and Stands - The appliance should be used
only with a cart or stand that is recommended by the
manufacturer.

6A. An appliance and
cart combination
should be moved
with care. Quick
stops, excessive
force, and uneven -
surfaces may cause "
the appliance and cart combination to overturn.

7. Wall or Ceiling Mounting -The appliance should be
mounted to a wall or ceiling only as recommended
by the manufacturer.

8. Ventilation - The appliance should be situated so
that its location or position does not interfere with its
proper ventilation. For example, the appliance
should not be situated on a bed, sofa, rug, or similar
surface that may block the ventilation openings; or,
placed in a built-in installation, such as a bookcase or
cabinet that may impede the flow of air through the
ventilation openings.

9. Heat - The appliance should be situated away from
heat sources such as radiators, heat registers,
stoves, or other appliances (including amplifiers)
that produce heat.

10. Power Sources - The appliance should be connected
to a power supply only of the type described in the
operating instructions or as marked on the ap-
pliance.

'11, Grounding or Polarization - The precautions that

should be taken so that the grounding or polarization,
means of an appliance is not defeatedr

12. Power-Cord Protection - Power-supply cords should
be routed so that they are not likely to be walked on
or pinched by items placed upon or against them,

Page 10

TROUBLESHOOTING

1.
2.
3.
When your unit does not seem to be operating correctly, first check the items in the following table. If the symptom does not correspond to

Have all connections been made PROPERLY?
Have you followed all operational instructions correctly?
Check speaker and the turntable systems for proper operation,

any of the problems as shown below, turn off the power sources immediately and contact your DENON dealer.

Problem

Cause

Remedy

FM AND AM RECEPTION

Radio program can not be received.

Antenna connection is wrong.
A signal strength is weak.

Check the connection.
Check the antenna installation.

Noise is reproduced.

A signal strength is weak.

u Automobile ignition noise interferes

with reception.
Other electrical equipment interferes
with reception.

Install an outdoor antenna.

Keep the antenna away from the
street.

Keep the equipment away from this
set, or turn off the power of the other
equipment.

The preset frequencies are erased.

The memory back-up term (about 1
month) passed.

Preset again.

In automatic tuning, the frequency
doesn't stop at the radio station.

A signal strength is weak.

Use manual tuning

In automatic tuning. it stops at the one
step lower or higher frequency than the
radio station.

Noise or strong signal strength is
received,

Use manual tuning for optimum re~
ception.

PLAVBACK OF THE AUDIO EQUIPMENTS

No sound is produced with power on.

Input and speaker cords connection
are wrong.

Speaker switch is off.

The INPUT SELECTOR buttons are in
wrong position.

The protective circuit is operating.

The fuse has blown out.

Check the connection.

0 Turn on speaker switch.

Check these position.

Turn the power off once, check the
connections to the speakers, then turn
the power on again.

Ask your dealer, or
DENON representative.

the nearest

Audible hum when playing records.

The input .and grounding cords con-
nection of the turntable are wrong.
The cords connection of the cartridge
are wrong.

The interference from the nearby TV
or radio transmission antenna,

Check the connection.
Check the connection.

Ask your dealer, or the nearest

DENON respresentative.

Howling is produced when the volume
control is turned up too high while play-
ing records.

The vibrations and sounds transmit
from the speakers to the turntable.

Insulate the vibrations, or keep the
speakers away from the turntable.

Cracking noise is produced when playing
records.

The record is stained with the dust.

The stylus tip of the cartridge is
stained with the dust.
The cartridge is defective.

Clean the record,
Clean the stylus tip.

Try the other cartridge.

1D

7 _ DHA-435FI/335R -

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