Majestic MCS-27

mike49504 · 25th April 2011, 07:02 PM

Wondering if anyone knows what the correct part number is or what diode i could use.

This is an electronic crossover and the reverse polarity didoe is burnt and half of its missing.

So just wondering if anyone knows what diode i could use in it?

Perry Babin · 25th April 2011, 07:09 PM

Virtually any diode rated for 1 amp or more will work. The 1N400x diodes are commonly used.

mike49504 · 25th April 2011, 07:15 PM

1N4004 is what i was thinking.

Is that a good choice for the diode?

Perry Babin · 25th April 2011, 07:30 PM

Yes if it's comparable in size to the original.

mike49504 · 26th April 2011, 12:12 AM

Ok I replaced the diode And when i try to power it up The power led will not light. Heres what i have on the 494

1:1.82
2:4.83
3:0.05
4:0.09
5:1.61
6:3.67
7:0
8:0
9:2.64
10:2.63
11:5.13
12:13.92
13:0
14:5.02
15:5.02
16:0

Perry Babin · 26th April 2011, 12:27 AM

The voltage doesn't look right. 8 and 11 should have the same voltage.

9 and 10 seem to be producing output. What are they using for power supply transistors?

mike49504 · 26th April 2011, 12:33 AM

Only transistors i see in this Crossover are

D1062
C1815

Perry Babin · 26th April 2011, 12:39 AM

Assuming that there are two D1062s that have their collectors connected to the transformer, do you see pulses on the center legs?

mike49504 · 26th April 2011, 12:41 AM

Theres only 1 D1062 in this unit

Perry Babin · 26th April 2011, 12:42 AM

Are the C1815s driving the transformer?

Did you check the op-amps to see if they had ±15v on their power supply pins?

25th April 2011, 07:02 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Majestic MCS-27 Wondering if anyone knows what the correct part number is or what diode i could use. This is an electronic crossover and the reverse polarity didoe is burnt and half of its missing. So just wondering if anyone knows what diode i could use in it?

25th April 2011, 07:09 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Virtually any diode rated for 1 amp or more will work. The 1N400x diodes are commonly used. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

25th April 2011, 07:30 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes if it's comparable in size to the original. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

26th April 2011, 12:27 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The voltage doesn't look right. 8 and 11 should have the same voltage. 9 and 10 seem to be producing output. What are they using for power supply transistors? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

26th April 2011, 12:39 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Assuming that there are two D1062s that have their collectors connected to the transformer, do you see pulses on the center legs? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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25th April 2011, 07:15 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	1N4004 is what i was thinking. Is that a good choice for the diode?

26th April 2011, 12:12 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Ok I replaced the diode And when i try to power it up The power led will not light. Heres what i have on the 494 1:1.82 2:4.83 3:0.05 4:0.09 5:1.61 6:3.67 7:0 8:0 9:2.64 10:2.63 11:5.13 12:13.92 13:0 14:5.02 15:5.02 16:0

26th April 2011, 12:33 AM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Only transistors i see in this Crossover are D1062 C1815

26th April 2011, 12:41 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	Theres only 1 D1062 in this unit

26th April 2011, 12:42 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are the C1815s driving the transformer? Did you check the op-amps to see if they had ±15v on their power supply pins? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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