Onkyo T 407 Service Manual

Page 1

T~407

Ref. No. 3403

ONKYO SERVICE MANUAL

SYNTHESIZED
FM STEREO/AM TUNER
MODEL T-407

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Black and Silver models

BHUD,BHUDN 120V AC,60Hz
BHUP,BHUPF,UP,UPF 230V AC,50/60Hz
BHUW,UW 120/220V AC,50/60Hz
BHUQA,UQA 240V AC,50HZ

SAFETY-RELATED COMPONENT WARNING
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 COMPO
NENTS WITH ONKYO PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS
MANUAL.

MAKE LEAKAGECURRENT 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM
THE SUPPLY CIRCUIT BEFORE RETURNING

THE APPLIANCE TO THE CUSTOMER.

TABLE OF CONTENTS

Specificmions .. ..
Scmu procedures .
Black diagram V.
Exploded view
Parts Iisl
Microproces. r description .
Block diagrams of [C .I
Adjusiment procedures
Primed circuit board View

Main circuiI
Display/SWniches/Remocon/Volume
Schematic diagrm .

120V model
Other models ....................
Printed Circuit board pans list .
Packing View ......................

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Page 2

T-407

SPECIFICATIONS

FM: AM:

Tuning Range: 87.50 7 108.00 MHz(5(l/25kHz Tuning Range: European models:

steps) and/or 88:01) 7 108.00MH2
Mono: 10.8dBt', USSpV. IHF
(lIShV DIN (75 ohms)
Stereo: 17,2dBf.2.tlpV.lHF
ZOMV DIN (75 ohms)
SOdB QuietingSensitivity: Mono: 16. ldBfV 1.7;LV (75 ohms)
Stereo: 36. ldBf. I7in(75 ohms)
Capture Ratio: l.3dB (Wide)
Image Rejection Ratio: 90dB
IF Rejection Ratio: 90dB
Signal-to-Noise Ratio: Mono: 85dB. IHF
Stereo: 80dB. IHF

Usable Sensitivity:

Selectivity: 55dB DIN (Narrow)
Alternate Channel
Attenuation: 50dB [HF (i400kHz)

AM Suppression Ratio: 50dB DIN (Narrow)

Total Harmonic Distortion: Mono: Orig/a (Wide)

Stereo: 0.2% (Wide)

30* 15.000Hz (+0.5 , 1.0dB)
45dB at [kHz (Wide)

30dB at 70 ,. 10.000Hz (Wide)
Output Voltage: 0.75V

Mutinchvel: 17:2dBff2.0)u.V(7Sohms)

Frequency Response:
Stereo Separation:

SERVICE PROCEDURES

1. Safety-check out
(Only USA. 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 :10% at 500V.

2. Memory 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 swttch turned on and off once in order to
change 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.
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 extremely humid climate.

3. Voltage Selector (Back Panel)
W models are equipped with a voltage selector to conform
with local power supplies. Be sure to set this switch to
match the voltage of the power supply in your area before

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522 - lollkHz (9kHz steps)
Canadian and USA models:
530 - l710kI-Iz (lUkI-Iz steps)
Saudi Arabia &

Worldwide models:

531 7 1602kHz (9kI-Iz steps)

Usable Sensitivity: ZSHV
Image Rejection Ratio: 40dB
IF Rejection Ratio: 4UdB

Signal-to-Noise Ratio: 40dB

Total Harmonic Distortion: 07%

Output Voltage: ISOmV

General

Dimensions (WXHXD): 455x90><364mm

|7-5/6><3-5/8">< l4-l/l3

4.8kg, 10.6le

0 AM loop antennaXl

0 FM T-shaped antennaxl

0 Connecting cableXl

0 RI remote control cable>

O 75/3000hm antenna adapterXZ
(Except 220V model)

0 Remote control transmitter

Specifications and features are subeict to change without

notice.

Weight:
Supplied accessories:

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 of the unit.

4. Tunign Step Frequency Switch (Bottom Panel)

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

5. Changing the AM band step

With the exception of the worldwide model. AM BAND
STEP selector switch is not provided.
When change the band step. refer the table as shown below,

Band Step D774 R773 1730
lOkHz a 9kHZ Add Add Cut

9kHz -> lOkHz Remove Remove Short

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DISPLAY PC BOARD