ONKYO TX-SR304E - Service Manual Immediate Download

TX-SR304/304E

SERVICE MANUAL

AV RECEIVER

MODEL

TX-SR304

MODEL

TX-SR304E

120V AC, 60Hz

S MDD, B MDD

S MDC

Ref. No. 3925

032006

230-240V AC, 50Hz

S MPP

S MPA, B MPA

TX-SR304 Silver and black models

TX-SR304E Silver and black models

RC-645S

TONE

STEREO

LISTENING MODE

DISPLAY DIGITAL INPUT

DIMMER

MEMORY TUNING MODE

RETURN

TUNING / PRESET

ENTER

SETUP

STANDBY

STANDBY/ON

CLEAR

PHONES

MULTl CH

DVD

VIDEO 1/VCR

VIDEO 2

VIDEO 3

TAPE

TUNER

MASTER VOLUME

A SPEAKERS B

MUTING

GUIDE

TOP MENU

SP A / B

SETUP

RETURN

PLAYLIST

RANDOM

SUBTITLE

PLAY MODE

AUDIO

REPEAT

RC-

645S

--/---

TAPE

ON/STANDBY

DIMMER

SLEEP

INPUT SELECTOR

REMOTE MODE

TA PE

TUNER

DVD

MULTI CH

LISTENING MODE

DISPLAY

TEST TONE

CH SEL

SURROUND

STEREO

CINE FLTR

LEVEL+

LEVEL-

L NIGHT

VOL

HDD

CDR

DVD

RECEIVER

+10

CLR

789

ENTER

DISC

ALBUM

SAFETY-RELATED COMPONENT

WARNING!!

COMPONENTS IDENTIFIED BY MARK

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

MEASUREMENTS TO DETERMINE THAT EXPOSED

PARTS ARE ACCEPTABLY INSULATED FROM THE

SUPPLY CIRCUIT BEFORE RETURNING THE

APPLIANCE TO THE CUSTOMER.

TX-SR304/304E

SERVICE PROCEDURE

1. Replacing the fuses

This symbol located near the fuse indicates that the

fuse used is slow operating type. For continued protection against

fire hazard, replace with same type fuse. For fuse rating, refer to

the marking adjacent to the symbol.

Ce symbole indique que le fusible utilise est e lent.

Pour une protection permanente, n'utiliser que des fusibles de meme

type. Ce demier est indique la qu le present symbol est appose.

2. To initialize the unit

1. Press and hold down VIDEO 1 / VCR button, then press STANDBY/ON button when the unit is powered on.

2. After " Clear " is displayed, the preset memory and each mode stored in the memory are initialized and

will return to the factory settings.

3. To check version of microprocessor

<Note> Main microprocessor Q701 only.

1. Press and hold down DISPLAY button, then press STANDBY/ON button when the unit is powered on.

The version will be displayed on FL display only for 3 seconds.

2. Press STANDBY/ON button to power off.

Ver.1.03/06Y28a

REF NO.

F901

F901 or

F902

F902 or

F6001

F6002

PART NAME

FUSE

DESCRIPTION

8A-UL/T-233

8A-T/UL-ST2

4A-SE-EAK

4A-SE-TL250V

8A-T/UL-ST-2

PART NO.

252329GR

252261GR

252077GR

252277GR

252261GR

REMARKS

!, <DD, DC>

!, <PP, PA>

<Notes>

<DD> : USA model

<DC> : Canadian model

<PP> : European model

<PA> : Australian model

FL display

[Ex.]

TX-SR304/304E

OPERATION CHECK-1

SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)

1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.

" Test - _ " is displayed only for 5 seconds.

2. Press VIDEO 3 button while the characters of " Test - _ " are displayed.

The unit will be in the state of " Test-4-00 ".

3. Repeatedly press TONE+ button until the characters of " Test-4-19 " are displayed.

Check whether the operation starts and continues automatically as follows.

If all channels are OK, the characters of " Test-4-29 " are displayed.

[Procedure]

<Note> No load. No input.

Test - _

Test - 4-00

[When]

1. Exchange power IC (Q6001, Q6002).

2. Exchange amplifier PC board ass'y (NAAF-8745).

Test - 4-19

Test - 4-20

Test - 4-23

Test - 4-21

Test - 4-22

Protect OK

Test - 4-29

Clear

Turn off

Front L ch

Check

Front R ch

Check

Center ch

Check

Surround L ch

Check

Surround R ch

Check

Blinks

4. Press STANDBY/ON button.

TX-SR304/304E

OPERATION CHECK-2

SPEAKER PROTECT-2 (CURRENT DETECTION)

1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.

" Test - _ " is displayed only for 5 seconds.

2. Press VIDEO 3 button, while " Test - _ " is displayed.

The unit will be in the state of " Test-4-00 ".

3. Repeatedly press TONE+button until " Test-4-29 " is displayed.

4. Connect the dummy load of 3 ohms to the Front L ch speaker terminals.

At this time, confirm that the speaker relay is not turned off.

5. Connect the dummy load of 1 ohm to the Front L ch speaker terminals.

At this time, confirm that the speaker relay is turned off and " Protect " is displayed.

Disconnect the dummy load immediately after checking the display of " Protect ".

6. Check other channels according to the same procedure as 4 and 5.

[Procedure]

<Note>

No input.

Do not check two or more channels at the same time.

Do not connect a dummy load to speaker terminal longer than 2 seconds.

Test - _

Test - 4-00

[When]

1. Exchange power IC (Q6001, Q6002).

2. Exchange amplifier PC board ass'y (NAAF-8745).

Test - 4-29

Clear

Turn off

7. Press the STANDBY/ON button.

Test - 4-29

Protect

Test - 4-29

Blinks

TX-SR304/304E

OPERATION CHECK-3

THERMAL SENSOR PROTECT

DEBUG MODE-1

Ver. 1.01/05Z28b

<Ex.>

T: 25 C/ 77 F

Turn off

[Procedure]

<Note> No output. No input.

[When]

1. Exchange power IC (Q6001, Q6002).

2. Exchange power amplifier PC board ass'y (NAAF-8745).

1. Press and hold down DISPLAY button, then press STANDBY/ON button when the unit is powered on.

The microprocessor version will be displayed for 3 seconds.

4. Press STANDBY/ON button.

3. Confirm that the displayed temperature is within +/-20 C from the ambient temperature.

This debug mode will help in analysing digital audio no sound trouble.

Check information on FL display and the related devices or circuits.

For details of the digit number and information on FL display, refer to next page.

Symptom on Display

Cause

Check

"E" is displayed

No input signal to DIR

Related devices from digital input to Q301

Displayed freq. is different

from input signal freq.

No input signal to DIR

Related devices from digital input to Q301

Displayed format is different

from input signal format

No input signal to DIR

Related devices from digital input to Q301

Digit No. on FL

Displayed format is different

from input signal format

Input signal to DSP is no good

Related devices from Q301 to Q201

"x" is displayed

Interface between DSP and

Microprocessor is no good

Related devices from Q701 to Q201

This identifies IC which

outputs error

The IC outputs error to main

microprocessor

Q5001, Q201, Q301 & related devices

2. Press TONE button while the version is displayed.