Onkyo T 4310 R Service Manual

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Ref. No. 3511

ONKYO® SERVICE MANUAL

QUARTZ SYNTHESIZED
FM STEREO/AM TUNER
MODEL T-4310R

Black model

BMP 230V AC, SOHZ
BMW 120V/220V AC, 50/60Hz
BMD 120V AC, 60Hz

SAFETY-RELATED COMPONENT WARNINGII
COMPONENTS IDENTIFIED BY MARK A ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO PARTS
WHOSE PART NUMBERS APPEAR As SHOWN IN THIS
MANUAL

MAKE LEAKAGE-CURRENT OR RESISTANCE MEA-
SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPT ABLY INSULATED FROM THE SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.

TABLE OF CONTENTS

Specifications ............................................................................... 2

Service procedures
Block diagram ..
Exploded View ..
Parts list ..........................................
Microprocessor connection diagram
Microprocessor terminal description
Packing View .................

2

3

4

.. 5

.. 6

7

8

Adjustment procedures .. 9
1

Printed circuit views from bottom side

Schematic diagram ................
Printed circuit board-parts list

ON I{17()®
Alllllll BIIMPIININIS

_1_

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SPECIFICATIONS
FM

Tuning range:

AM

Tuning range
European models:
U.S.A. & Canadian models:
Worldwide models:

8750 - 108.00 MHZ
(25 kHz/50 kHz steps) 522 -1611 kHz (9 kHz steps)

Usable sensitivity 530 -l7lO kHz (10 kHz steps)

Mono: 1 1.2 dBf. 1.0 V. 75 Ohms, [HF 531-1602 kHz (9 kHz steps)
0.9 LlV. 75 Ohms, DIN 53o1710 kHz (10 kHz steps)
Stereo: 17.2 dBf. 2.0 11V. 75 Ohms. lI-IF Usable sensitivity: 25 LN
20 pV. 75 Ohms, DIN Image rejection ratio: 40 dB
SOdB quieting sensitivity IF rejection ratio: 40 dB
Mono: 16.1 dBf. 1.7 pV. 75 Ohms Signal-to-noise ratio: 40 dB
Stereo: 36.1 dBf, l7 uV, 75 Ohms Total Harmonic Distortion: 0.7%
Capture ratio: 1.5 dB Output voltage: 150 mV
Image rejection ratio; 80 dB
U.S.A. & Canadian models: 40 dB Genera
[F rejection ratio: 90 dB Power SUPPIY '
Signal»to-noise ratio European & Australian AC 230 V, 50 Hz
Mono: 76 dB. II-IF models: ,
Stereo: 66 dB, IHF U.S.A. & Canadian models: AC 120 V, 60 Hz
Alternate channel attenuation: 60 dB. IHF Worldwide models: AC 120 V and 220 V switchable,
Selectivity: 60 dB. DIN (Narrow) _ 50 I'll/60 HZ
(flOOkHz. 40 kszeV) Dimenstons (W x H X D): 4:351:32} 3:797:21 12 U2
_« . . . . _ x . x .
AM suppression ratio. 50 dB Weight: 3.9 kg, 8.6 lbs.

Total Harmonic Distortion
Mono:
Stereo:
Frequency response:
Stereo separation:

0.1% (Normal)

0.2% (Nomal)

30 - 15.000 Hz ($1.5 dB)
40 dB at 1 kHz (Normal)
30 dB at 70 - 10.000 Hz

Specifications and features are subject to change without notice.

Output voltage: 0.75 V
USA. model: 045 V
Muting level: 17.2 dBf. 2.0 uV, 75 Ohms
SERVICE PROCEDURES
1. Safety-check out 3. Voltage Selector (Back Panel)

(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
supply cord and chassis,

Specifications: 3.3Mohm i10% at 500V.

2. Memory preservation

This unit does not require memory preservation batteries. Abuilt-
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
back-up 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. On 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 extermely humid climate.

W models are equipped with a voltage selector to confirm 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. Confu'm 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 of the unit.

. Tuning Step Frequency Switch (Bottom board)

W models are equipped with a switch for the AM (9kHz/10kHz)
band. The switch should be set to the proper steps for the radio
broadcast frequencies in your area.

. Changing the band step

With the exception of the models below. a BAND STEP
selector switch is not provided.

AM
MODEL BAND STEP 1702
120V 10kHz -> 9kHz Short
Others 9kHz -> 10kHz Open