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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..............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 !

Tuesday, 12 March 2019

MCINTOSH MA6900 TONE CONTROL CIRCUIT

MCINTOSH MA6900 TONE CONTROL CIRCUIT

MCINTOSH MA6900

TONE CONTROL CIRCUIT 

TONE COTROL COMPONENTS
C1 C2  CAP M POLY .1UF 10% 100VDC
C3 C4  CAP ELECT 10UF 16V (4X5 CASE)
C5 C6  CAP MONO 220PF 100V 10% NPO
C7 C8  CAP MONO 47PF 200V 10% NPO
C9 C10  CAP MONO 22PF 200V 10% NPO
C11 C12  CAP ELECT 220UF 25V
C13 C14 C33 C34  CAP ELECT 47UF 50V
C15 C16 C43 C44 C45 C46 C54  CAP ELECT 10UF 50V
C17 C18  CAP M POLY .047UF 5% 63VDC
C19 C20  CAP ELECT 1.5UF 10% 50V
C21 C22  CAP M POLY .01UF 5% 63VDC
C23 C24  CAP M POLY .47UF 5% 50/63VDC
C25 C26  CAP MPOLY .0033UF 5% 63VDC
C27 C28  CAP M POLY .15UF 5% 63VDC
C29 C30  CAP POLY 0.001MF 5% 63VDC
C31 C32  CAP M POLY .033UF 5% 63VDC
C35 C36 C37 C38  CAP M POLY .22UF 5% 63VDC
C39 C40 C41 C42  CAP MONO 470PF 100V 10% NPO
C47 C48 C49 C50 C51 C52  CAP MONO .1UF 50V 20% Z5U
C53  CAP ELECT 47UF 10V BP
D1 D2  DIODE SILICON
IC1 IC6 IC7  IC DUAL OPERATIONAL AMPLIFIER
IC2 IC3 IC4 IC5  IC OPERATIONAL AMPLIFIER
J1  CONN 8 POS MALE FRICTION LOCK
J2  CONN 4 PIN
J3  CONN MALE 6 POS RT ANGLE
K1 K2 K3  RELAY REED FORM 1A 5V 500 OHMS
R1  POT 50KAX2
R2  POT BALANCE 2KOHM
R3 R4 R5 R6 R7  POT EQUAL
R9 R10  RES MF 2.21K 1% 1/4W
R11 R12  RES MF 3.32K 1% 1/4W
R13 R14  RES MF 475K 1% 1/4W
R15 R16 R19 R20  RES MF 1K 1% 1/4W
R17 R18  RES MF 10K 1% 1/4W
R21 R22 R45 R46  RES MF 2.74K 1% 1/4W
R23 R24 R27 R28 R31 R32 R35 R36  RES MF 681 1% 1/4W
R25 R26R29 R30 R33 R34 R37 R38 R43  RES MF 100K 1% 1/4W
R39 R40  RES MF 475 1% 1/4W
R41 R42  RES MF 40.2K 1% 1/4W
R44 R51 R52  RES MF 100K 1% 1/4W
R47 R48  RES MF 33.2K 1% 1/4W
R49 R50  RES MF 22.1 1% 1/4W
R53 R54  RES MF 100 1% 1/4W
R55 R56 R57 R58  RES MF 10 1% 1/4W
CIRCUIT DIAGRAM 
CLICK ON THE IMAGE TO ZOOM IN
Posted By: FRANK at 10:38
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