REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 6 February 2019

YAMAHA AX496 STEREO AMPLIFIER – CIRCUIT DIAGRAM – ADJUSTMENTS - DISASSEMBLY

Yamaha AX496 Stereo Amplifier – Circuit Diagram – Adjustments - Disassembly

Minimum RMS Output Power
8Ω, 20Hz to 20kHz, 0.019% THD:  85W+85W
Maximum Output Power (EIAJ)
1kHz, 10% THD: 8Ω/6Ω 130W / 150W
Dynamic Power (IHF)
8/6/4/2Ω: 30/150/185/220W
DIN Standard Output Power
4Ω, 1kHz, 0.7% THD: 120W
IEC Output Power
8Ω, 1kHz, 0.019% THD: 100W
Weight
AX-496 9.5 kg (21lbs)
Remote control model number: RAX9 V499920
Do not change the IMPEDANCE SELECTOR switch setting at the back of this set, while the power to this unit is on, otherwise this unit may be damaged.
Disassembly
(Remove parts in the order as numbered.)
1. Removal of Top Cover
Remove 4 screws (1) and 4 screws (2) in Fig.
2. Removal of Front Panel
a. Remove 6 screws (3) in Fig.
3. Checking and Parts Replacement of MAIN P.C.B. (1)
a. Disconnect the power cord from the AC outlet.
b. Remove 3 screws (4) attaching the Speaker terminal and Impedance Selector in Fig. 
c. Remove 2 screws (5) and remove 1 plastic rivet (6) in Fig. then remove the Sub Chassis.
d. Remove 4 screws (7) in Fig. then remove the MAIN P.C.B. (1) with Heat Sink and Chassis.
Adjustments: Confirmation of Idling Current
• Right after Power is switched ON, confirm the voltages measures at R553 (L ch) and R561 (R ch) are between 0.1mV to 10mV.
• If it exceeds 10mV, open (cut off) R552 (L ch), R560 (R ch) and reconfirm the voltage.
PWB main - foil side
Schematic
Click on the pictures to zoom in
Posted By: FRANK at 01:31
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