Onkyo HTR 940 Service Manual

Page 1

HT-R94O

Ref. No. 3960

ONKYO SERVICE MANUAL 2"

AV RECEIVER
MODEL HT-R940

Black and Silver modeIs RC'BSOM

B MDC 120V AC, 60Hz
B MPP, S MPP 230-240V AC, 50Hz

SAFETY-RELATED COMPONENT
WA R N I N G ! !

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
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

ONKYO®

IMAGINATIVE SIGHT SI SOUND

Page 2

SERVICE PROCEDURE

1. Replacing the fuses

EE 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.

EE 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 1a qu le present symbol est appose.

REF NO. PART NAME DESCRIPTION PART NO. REMARKS
F901 FUSE 8A-UL/T-233 252329GR 1,
F901 or FUSE 8A-T/UL-ST2 25226lGR 1,
F901 FUSE 4A-SE-EAK 252077GR 1,
F901 or FUSE 4A-SE-TL250V 252277GR 1,
F903 FUSE 5A-UL/T-233 2523266R 1,
F903 or FUSE SA-T/UL-STZ 2522SSGR 1,
F903 FUSE 2.5A-SE-EAK 25207SGR 1,
F903 or FUSE 2.5A-SE-TL250V 25227SGR 1,
F6901 FUSE 10A-UL/T-233 25233OGR 1

F6901 or FUSE 10A»TfUL-ST2 252333GR 1

F6902 FUSE 10A-UL/T-233 25233OGR 1

F6902 or FUSE 10A-T/UL-ST2 252333GR

: Canadian model
: European model

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

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.

Ex.

Ver.1.01/05305a

2. Press STANDBY/ON button to power off.

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.

HT-R940

Page 3

HT-R94O

OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTIION)

[When]
1. Exchange power transistors (Q6050 » Q6056, Q6060 » Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8779).

[Procedure]
No load. No input.

1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.
" Test - 7 " is displayed only for 5 seconds.

T931 ' ::_" -Blinks

2. Press VIDEO 3 button while the characters of " Test - 7 " are displayed.
The unit will be in the state of " Test-4-00 ".

Test - 4-00

3. Repeatedly press +(TONE) button until the characters of " Test-4-21 " are displayed.
Test - 4 -21

Check whether the operation starts and continues automatically as follows.

Test - 4-21
Front Lch l

+
Protect OK _ Check Test - 4-25
+ + Surround R ch
Test - 4-22 Protect OK Check
* Front R ch +
Check
Protect OK _ Test 4 26 Surround BackLch
+ _ "' Check
Test _ 4_23 Protect OK
4, Center ch +
Check
Protect OK _ Test ' 4'27 Surround Back R ch
+ _ "' Check
Test - 4-24 Protect OK
Surround L ch *
+ Check
Protect OK _ Protect
I-

If all channels are OK, the characters of " Test-435 " are displayed.
Test - 4-35

4. Press STANDBY/ON button. Turn off

Clear ->