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 MC2000 CIRCUIT

MCINTOSH MC2000 CIRCUIT

MCINTOSH MC2000

CIRCUIT

Power Output
130 watts into 8, 4 or 2 ohm loads is the minimum sine wave continuous average power output per channel from 20Hz to 20,000Hz with both channels operating.
Power Requirement
100 Volts, 50/60Hz at 5.8 Amps
120 Volts, 50/60Hz at 4.8 Amps
230 Volts, 50/60Hz at 2.5 Amps
ABOUT SCHEMATIC
. The heavy lines on the schematics denote the primary signal path.
2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz
b. All voltages are +/-10% with respect to ground.
A high impedance (10megaohm) voltmeter must be used.
3. Unless otherwise specified:
a. Resistors values are in ohms.
b. Capacitor values are in microfarads (uF).
c. Inductor values are in microhenries (uH).
4. On PC Board Drawings, Square Pad Indicates:
a. Polarized Capacitors - Positive
b. Diode - Cathode
c. Others - Pin 1
POWER AMP CIRCUIT 

VU METER CIRCUIT 
CLICK O THE IMAGES TO ZOOM IN


VU METER COMPONENT LIST
ZENERDIODE 6.2V 5% 500MW D12
DIODERECTIFIERD2 D11
FUSE 2ASLO-BLO 5 X 20 250VIEC F1
MALECONN 3 POS RT ANGLEJ2-
MALECONN 6 PIN RT ANGLEJ1-
4 PIN RT.ANGLEJ3-
TRIAC8A 200VQ8
TRANSISTOR NPN MPS4124 2K/REEL Q1 Q5
TRANSISTOR PNPQ2 Q6
TRANSISTOR P.CHANNEL JUNC.FET Q7
TRANSISTOR NPNQ3 Q4
ICREGULATOR -12VIC2
ICREGULATOR 12VIC1
DUALOPERATIONAL AMPLIFIER IC3 IC4
TRIM POT100K OHM 20%R10
RES CF3.3K 5% 1/4WR23
RES CF2.7M 5% 1/4WR1
RES CF10 5% 1/4WR26
CARB FILMRES 680 OHMS 5% 1/2W R24
RES MF10K 1% 1/4WR7 R20 R22
RESMF10K 1% 1/4WR7 R22
MF 499 OHMSR17
METALFILM RES 1K 1% 1/4WR19 R25
16.5K 1% 1/4WR18
METALFILM RES 200K 1% 1/4W R6 R12
METALFILM RES 150K 2% 1/4W R9
METALFILM RES 22.1K 1% 1/4W R21
METALFILM RES 100 OHM 1% 1/4W R11 R16
METALFILM RES 10M 1% 1/4W R8
METALFILM RES 1M 1/4WR2
METALFILM RES 2.74M OHM 1/4WR13
MF RES3.92K 1% 1/4WR15
MF RES15K 1% 1/4WR5 R14
MF RES13.7K 1% 1/4WR20
Posted By: FRANK at 10:39
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