Onkyo HTR 508 Service Manual

Page 1

HT-R508

Ref. No. 4042

ONKYO SERVICE MANUAL °2°°

AV RECEIVER
MODEL HT-R508

RC-681 M

HT-R508 Silver model
\ s MPP |23OV AC, 50Hz l

HT-R508 for HT-3508 Silver model
\ s MPP |230V 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 72

OPERATION CHECK-3
CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR)

[When]

1. Exchange power transistors (Q6050 - Q6054, Q6060 » Q6064).
2. Exchange power amplifier PC board ass'y (NAAF-8779).

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

No output. No input.

[Procedure]

Output sensor

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

Test -

FL display
- Blinks

2. Press AUX button while " Test - 7 " is displayed.
The unit will be in the state of " Test-4-00 ",

Test - 4-00

3. Repeatedly press + (TONE) button until " Test-4-36 " is displayed.
Test - 4-36

4. At this time, check that the red characters of " FM STEREO " is displayed
And, check that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds

2.] FM STEREO

Test - 4-36

5. Press STANDBY/ON button.
Clea r ->

Standby

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.

FLd' |

2. Press TONE button while the version is displayed

T. 25°C/ 77°F

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

4. Press STANDBY/ON button.
Clea r ->

Standby