Question about Onkyo Audio Players & Recorders
“Hi, Onkyo TX SR 705 have a super cap for memory presets ou eeprom?? ”
Yes, it may have a 5.5V cap with 0.1F for memory to use .When the power is down and it loose the presets, whats the problem?? Tks
Don't worry, it will be charged up when the amp is On. The longer the time it is on, the longer the time it charged.For your case, replace the cap mentioned above can fix the problem. I will post the photo later.
After checking the onkyo TX-SR705 service manual, however, I did not find any capacitor of 5.5V 0.1F on the schematics. The EEPROM is powered by a polar capacitor. See photo.
Step of repairing
(1)Download the onkyo TX-SR 705 service manual.
(2)Find out the EEPROM located at Main Microprocessor Unit.
(3)Replace the capacitors of epprom
(4)If the problem doesn't solve, copy
all data form the old EEPROM by a SPI EPPOM reader.
(5)Buy a new SAME MODEL EEPROM and copy the old data to
the new one.
(6)remove the old defective one from the circuit board
(7)put the new one with data copied to the circuit board.
Posted on May 27, 2019
SOURCE: onkyo 705
You have probably done this, but have you changed the video settings in the setup menu to have the tv using HDMI out? I believe it is under the first option when the menu comes up.
Posted on Jan 05, 2008
SOURCE: cobra 29ltd classic : no rx / tx
D23 is the reverse protection diode and it shorting is the primary reason your fuse blew. As you posted, power was applied in reverse, hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)
Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Posted on Feb 04, 2008
SOURCE: Onkyo TX-DS898 Memory Loss
THEY USE A MEMORY CAP.ITS LOCATED ON THE MAIN PCB ASSEMBLY, REF. C7701 ONKYO PART NUMBER IS 3000078/ WITH THE UNIT TURNED OFF MEASURE THE VOLTAGE YOU SHOULD HAVE APPROX 5V IF NOT THE CAP IS BAD. ALSO MEASURE WITH UNIT ON AND YOU SHOULD ALSO MEASURE 5 V IF NOT THEN THE SUPPLY VOLTAGE GOING TO THE CAP IS BAD.
Posted on Apr 19, 2010
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