Service Manual for ONKYO HT-R940

HT-R940

SERVICE MANUAL

AV RECEIVER

Black and Silver models

MODEL

HT-R940

Ref. No. 3960

062006

120V AC, 60Hz

230-240V AC, 50Hz

B MDC

B MPP, S MPP

MUTING

GUIDE

TOP MENU

SP A / B

SETUP

RETURN

PLAYLIST/CAT

RANDOM

SUBTITLE

PLAY MODE

AUDIO

REPEAT

RC-

650M

--/---

TAPE

M D/CDR

HDD

CABLE

ON/STANDBY

DIMMER

ENT

D TUN

SLEEP

10

11

12

INPUT SELECTOR

HDD

DVD

VCR

REMOTE MODE

V

1

V

2

V

3

CD

TAPE

TUNER

DVD

MULTI CH

LISTENING MODE

TV

DISPLAY

TEST TONE

CH SEL

SURROUND

STEREO

Re-EQ

LEVEL+

LEVEL-

L NIGHT

VOL

SAT

VCR

TV

DVD

RECEIVER

CD

INPUT

+10

0

CLR

12

3

45

6

789

ENTER

CH

DISC

ALBUM

RC-650M

MASTER VOLUME

VIDEO

STANDBY

TONE

DISPLAY

THX

DIMMER

MEMORY

DIGITAL

INPUT

TUNING

MODE

AB

SPEAKERS

TUNER

TAPE

VIDEO

3

VIDEO

2

VIDEO

1

VCR

DVD

MULTI CH

C D

SETUP

RETURN

CLEAR

LISTENING MODE

AUDIO

LR

VIDEO

3 INPUT

STANDBY/ON

PHONES

TUNING

PRESET

ENTER

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.

HT-R940

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.

4. Memory Backup

The AV receiver uses a battery-less memory backup system in order to retain radio presets and other settings

when it is unplugged or in the case of a power failure.

Although no batteries are required, the AV receiver must be plugged into a wall outlet in order to charge the

backup system. Once it has been charged, the AV receiver will retain the settings for several weeks,

although this depends on the environment and will be shorter in humid climates.

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.1.01/05305a

Ex.

<Notes>

<DC> : Canadian model

<PP> : European model

REF NO.

F901

F901 or

F901

F901 or

F903

F903 or

F903

F903 or

F6901

F6901 or

F6902

F6902 or

PART NAME

FUSE

DESCRIPTION

8A-UL/T-233

8A-T/UL-ST2

4A-SE-EAK

4A-SE-TL250V

5A-UL/T-233

5A-T/UL-ST2

2.5A-SE-EAK

2.5A-SE-TL250V

10A-UL/T-233

10A-T/UL-ST2

10A-UL/T-233

10A-T/UL-ST2

PART NO.

252329GR

252261GR

252077GR

252277GR

252326GR

252258GR

252075GR

252275GR

252330GR

252333GR

252330GR

252333GR

REMARKS

!, <DC>

!, <PP>

!, <DC>

!, <PP>

!

HT-R940

OPERATION CHECK-1

SPEAKER PROTECT-1 (DC VOLTAGE DETECTIION)

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-4-21 " are displayed.

[Procedure]

<Note> No load. No input.

Test - _

Test - 4-00

[When]

1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).

2. Exchange amplifier PC board ass'y (NAAF-8779).

Test - 4-21

Check whether the operation starts and continues automatically as follows.

Test - 4-21

Test - 4-22

Test - 4-25

Test - 4-23

Test - 4-24

Protect OK

Protect

Protect OK

Test - 4-35

Clear

Turn off

Front L ch

Check

If all channels are OK, the characters of " Test-4-35 " are displayed.

4. Press STANDBY/ON button.

Front R ch

Check

Center ch

Check

Surround L ch

Check

Surround R ch

Check

Blinks

Test - 4-26

Protect OK

Surround Back L ch

Check

Test - 4-27

Protect OK

Surround Back R ch

Check

HT-R940

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-4-35 " 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 transistors (Q6050 - Q6056, Q6060 - Q6066).

2. Exchange amplifier PC board ass'y (NAAF-8779).

Test - 4-35

Clear

Turn off

7. Press the STANDBY/ON button.

Test - 4-35

Protect

Test - 4-35

Blinks

HT-R940

OPERATION CHECK-3

CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR)

Test - _

Test - 4-00

Test - 4-36

Clear

Turn off

Blinks

Ver. 1.01/06222A

<Ex.>

T: 25 C/ 77 F

Clear

Turn off

Output sensor

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-4-36 " is displayed.

Test - 4-36

FM STEREO

4. At this time, confirm that the red characters of " FM STEREO " is displayed.

And, confirm that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds.

6. Press STANDBY/ON button.

[Procedure]

<Note> No output. No input.

[When]

1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).

2. Exchange power amplifier PC board ass'y (NAAF-8779).

3. Exchange thermal sensor PC board ass'y (NAETC-8781).

Thermal sensor

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.

2. Press TONE button while the version is displayed.

4. Press STANDBY/ON button.

Test - 4-37

FM STEREO

5. Press +(TONE) button and confirm that the red characters of " FM STEREO " is displayed.

And, confirm that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds.

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

ONKYO HT-R940 Service Manual

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