MTX JH1200 repair

tobyret2 · 19th November 2020, 08:15 PM

Good evening. Please help me with the repair of Mtx jh12000. He came to me without many complete sets and I am trying to restore them. Can anyone know what resistors should be in the allocated places? And another problem is + -15v. put new lm317 lm337 but they heat up even without load, 70 volts come to their input after tip29 tip30 ..
Tip29c and Tip30c I replaced with bd911 bd912 Did I do it right? I could not buy original spare parts in our city. I also attached a photo of the pulse on the shutters of the power supply, is everything good there? Thanks in advance to everyone who responds ...

Perry Babin · 19th November 2020, 08:22 PM

R4 is a 100 ohm. Marked 1000.

What do you mean that the 317/337 have no load?

What is the voltage on all 3 terminals of each regulator?

tobyret2 · 19th November 2020, 08:40 PM

I installed new operational amplifiers tl074 tl072, a sound appeared and after 5 seconds everything burned out .... I evaporated them .. as I understand it, these + -15 are needed to power them ... but even without them lm337 and lm317 are hot .. Tomorrow I will take a photo ... Maybe there is a circuit of this amplifier? are the resistors between the base and the collector on bd911 and bd912 correct? I was embarrassed that one had 3.32 Kom and the other had 12Kom

tobyret2 · 19th November 2020, 10:25 PM

I didn't have these details. I assumed that there should be diodes here? Am I right, should I have zener diodes installed?

tobyret2 · 19th November 2020, 10:26 PM

Quote:

Originally Posted by Perry Babin

R4 is a 100 ohm. Marked 1000.

What do you mean that the 317/337 have no load?

What is the voltage on all 3 terminals of each regulator?

I installed new operational amplifiers tl074 tl072, a sound appeared and after 5 seconds everything burned out .... I evaporated them .. as I understand it, these + -15 are needed to power them ... but even without them lm337 and lm317 are hot .. Tomorrow I will take a photo ... Maybe there is a circuit of this amplifier? are the resistors between the base and the collector on bd911 and bd912 correct? I was embarrassed that one had 3.32 Kom and the other had 12Kom

Perry Babin · 19th November 2020, 10:43 PM

MTX diagrams are virtually impossible to find.

Contact MTX to see if they will help with component values. At one time they would but now it's questionable. At least try.

tobyret2 · 20th November 2020, 03:58 AM

already wrote to technical support. What causes the voltage in the shoulders to float? in 1 arm 72 in the other 88. Then it can become the other way around ... Is the oscillogram normal?

Perry Babin · 20th November 2020, 04:33 AM

There is a translation problem.

Shutter?

Shoulder?

I can guess but there's no point in wasting time if you can clarify.

tobyret2 · 20th November 2020, 09:36 AM

This q116 q119 very hot... This is normal or no ?

tobyret2 · 11:09 AM

[QUOTE=Perry Babin;6418493]There is a translation problem.

Shutter?

Shoulder?

shoulder good work now +-70v
+-15v normal

my problem now very hot q116 q119 This is normal or no ?

Graph out shoulder 1 and out shoulder 2 bad...

19th November 2020, 08:22 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	R4 is a 100 ohm. Marked 1000. What do you mean that the 317/337 have no load? What is the voltage on all 3 terminals of each regulator? __________________ Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.

19th November 2020, 10:43 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	MTX diagrams are virtually impossible to find. Contact MTX to see if they will help with component values. At one time they would but now it's questionable. At least try. __________________ Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.

20th November 2020, 04:33 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There is a translation problem. Shutter? Shoulder? I can guess but there's no point in wasting time if you can clarify. __________________ Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.

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19th November 2020, 08:40 PM	#3
tobyret2 diyAudio Member Join Date: Feb 2020	I installed new operational amplifiers tl074 tl072, a sound appeared and after 5 seconds everything burned out .... I evaporated them .. as I understand it, these + -15 are needed to power them ... but even without them lm337 and lm317 are hot .. Tomorrow I will take a photo ... Maybe there is a circuit of this amplifier? are the resistors between the base and the collector on bd911 and bd912 correct? I was embarrassed that one had 3.32 Kom and the other had 12Kom

20th November 2020, 03:58 AM	#7
tobyret2 diyAudio Member Join Date: Feb 2020	already wrote to technical support. What causes the voltage in the shoulders to float? in 1 arm 72 in the other 88. Then it can become the other way around ... Is the oscillogram normal?