Onkyo T 4210 Service Manual

Page 1

ONKYO

T-4

Ref. No. 3503

SERVICE MANUAL

SYNTHESIZEI
FM STEREO/AM TUNER

MODEL T-42 1 O

Black model
BMDN, BMD 120V AC, 60 Hz
BMPT 230V AC, SOHz
BMW l20/220V AC, 50/60Hz

SAFETY-RELATED COMPONENT WARNINGH

COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL F OR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COM-
PONENTS WITH ONKYO PARTS WHOSE PART

NUMBERS APPEAR AS SHOWN IN THIS MANUAL

MAKE LEAKAGE-CURRENT 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY IN-
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.

TABLE OF CONTENTS

Specificatins """"
Service procedures
Block diagram (120V model
Exploded View ''''
Parts list ~~~~~
Microprocessor descriptions-v
Block diagram {other model?"
Adjustment pruceduresm
Packing Vie -----
P4: board view
Schematic diagram
Pc huard parts list
Packmg VIP --------------

ONKYO
Alllllll BBMPIINENIS

-1,

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T-421

SPECIFICATIONS

FM

Tuning range:

Usable sensitivity
Mono:

Stereo:

U.S.A. & Canadian models
Mono:
Stereo:

50 dB quieting sensitivity
Mono:
Stereo:
U.S.A. & Canadian models
Mono:
Stereo:

Capture ratio:

Image rejection ratio:

U.S.A. & Canadian models:

IF rejection ratio:
Signal-minoise ratio

Mono:

Stereo:
Altemale channel attenuation:
Selectivity:

U.S.A. & Canadian models:

AM suppression ratio:
Total Harmonic Distortion
Mono:
Stereo:

87.50 - 108.00 MHz
(50 kHz steps)

11.2 dBf, 1.0 11v, 75 Ohms, 1111?
09 av, 75 Ohms, DIN
17.2 dBf, 2.0 av. 75 Ohms, 1m:
20 V, 75 Ohms, DIN

11.2 dBf, 2.011V, 300 Ohms, IHF
17.2 dBf, 4.0 uV, 300 Ohms, II-IF

16.1 dBf', 1.7 LN. 75 Ohms
36.1 dBf, 17 itV, 75 Ohms

16.1 dBf, 3.5 11V, 300 Ohms, lHF
36.1 dBf, 35 0V, 300 Ohms, IHF
1.5 dB
80 dB
40 dB
90 dB

73 dB, IHF

66 dB, IHF

50 dB, IHF

55 dB. DIN

(1300 kHz, 40 kHz dev)
50 dB, 1HF(:400 kHz)
50 dB

0.1%
0.2%

SERVICE PROCEDURES

1. Safety-check out
(Only U.S.A. model)

After correcting the original service problem,perform
the following safety check before releasing the set to

the customer.

Connect the insulating-resistance tester between the
plug of power suuply cord and chassis.

Specifications: 3.3Mohm $1096 at 500V.

2. Memroy preservation

This unit does not require memory preservation batteries.

A built-in memory power back-up system preserves contents
of the memory during power failures and even when the
unit is unplugged. The unit must be plugged in and the
power switch turned on and off once in order to charge the
back-up system. Note that since this is not a permanent
memory.the power switch must be turned on and off a few
times each month to keep the backup system operative.
The period of time during which memory contents are
preserved after power has last been turned off varies
depending on climate and placement of the unit.

0n the average, memory contents are protected over a
period of 3 to 4 weeks (a minimum of 2 weeks) after

the last time power has been turned off. This period is
shorter when the unit is exposed to very high humidity or
used in an area with an extremely humid climate.

Frequency response:
Stereo separation:

30 - 15,000 Hz ($15 (113)
40 dB at 1 kHz
30 dB at 70 - 10,000 Hz

Output voltage: 0.75 V
U.S.A. 8L Canadian models: 0.45 V
Muting level: 17.2 dBf, 2.0 11V, 75 Ohms
AM
Tuning range
Europun models: 522 -161] kHz (9 kHz steps)
U.S.A. & Canadian models: 530 -1710 kHz (10 kHz steps)
Worldwide models: 531-1602 kHz (9 kHz steps)
53071710 kHz (10 kHz steps)
Usable sensitivity: 25 [1V
Image rejection ratio: 40 dB
IF rejection ratio: 40 dB
Signal-to-noise ratio: 40 dB
Total Harmonic Distortion: 0.8%
Output voltage: 150 mV
General
Power supply
European & Australian AC 230 V, 50 Hz
models:
U.S.A. & Canadian models: AC 120 V, 60 Hz
Worldwide models: AC 120 V and 220 V switchable,
50 H1160 Hz
Dimensions (W x H x D): 455 X 90 X 307 mm
17-15l16" X 3-9/16 X12»1/16
Weight: 3.7 kg, 8.2 lbs.

Specifications and features are subject to change without notice.

3. Voltage Selector (Back Panel)

W models are equipped with a voltage selector to con-
form with local power supplies. Be sure to set this switch
to match the voltage of the power supply in your area
before turning the power switch on. This switch is set to
220V at the factory. Voltage is changed by sliding the
groove in the switch with a screwdriver to the right or
left. Confirm that the switch has been moved all the way
to the right or left before turning the power switch on.
Models without a voltage selector can only be used in
areas where the power supply is the same as that ofthe
unit.

4. Tuning Step Frequency Switch (Bottom board)
W models are equipped with a switch for the AM (9kHz/
lOkHz) band, The switch should be set to the proper
steps for the radio broadcast frequencies in your area.

5. Changing the band step
With the exception of the models below, a BAND STEP
selector switch is not provided.

AM
MODEL BAND STEP J767
120V 10kHza+9kHz Short
Others 9kHza10kHz Open