Mackie SRM450V2 solutions

[nickb]

Thanks being honest, I'm in Essex. Happy to post for repair. A placed has offered to look at it for £80 hopefully with a fix, about another £30 postage.

Any advice would be good.

You need to put your meter on the resistance range and then carefully put your probes across the ends. There are multiple problems - the components are tiny, easily damaged and the probes are big. You will be measuring with the components in circuit and that can change the readings. If it is these resistors that are faulty you need the tools and skill to change them. There is a good chance that it's something else. Look for damaged or burnt parts. Re-seat any connectors.

Essex, huh? A heavily populated area. There has to be someone within driving distance from you that can take to look. That will save you on the shipping.

[Be79n]

See I' not sure I would feel comfortable with that, I'm a freelance sound & light service technician. I look after hotels, resorts and venues etc so more then happy to service/clean gear but don't have the confidence on circuit board soldering that is so small on a board I'm not used too. If anyone is local and able to fix it I'm happy to pay a decent rate. Thanks for your help Nickb.

[guitardad]

See I' not sure I would feel comfortable with that, I'm a freelance sound & light service technician. I look after hotels, resorts and venues etc so more then happy to service/clean gear but don't have the confidence on circuit board soldering that is so small on a board I'm not used too. If anyone is local and able to fix it I'm happy to pay a decent rate. Thanks for your help Nickb.

You can check the resistors in circuit. Leave unit off for 20-30 min. Caps will discharge on their own. Grab a DMM and see what readings you get on the resistors. Chances are they overheated and are out of tolerance. Replacing them with same value components is another option. This is fairly a common problem of the 450V2's

[Be79n]

Thanks but I ended off sending it for repair.

[Sharpy]

Here are some fixes for these:

Problem with HF or no HF output- replace U31 TDA 7294

No audio at all- check resistors R243,248, 288 (upper board by SMPS).

Audio not as loud as it should be, Audio weak at mic level or not much change in level from 4db to mic position/+40db max-
Open R22 (smd resistor 10 ohms)

Audio cuts out- check for a glob of yellow brown glue (similar to what mitsubishi used to use) near R3, R7, R8, R11, C6, C7 and U3. Cable from the XLR board is often glued and that glue covers a few smd resistors and small smd caps. The glue tends to break off (vibration/transport) taking one or more smd parts with them. This one will often make you decide to replace the entire board assy because you threw it across the room.

No LF drive at all- replace U28, Q11, Q12, D19 adn D23. Also check R156 and R157 for opens.

Intermittently won't turn on or won't power completely or has hiss sound then dies when powering up-
C189- 192 may be dry/open. Check those with an ESR meter if you have one, or just replace them.
C189,190- 680uf@200v ; C191,192- 220uf@200v

I have the issue where the audio is not as loud as it should be. Can you throw a little more light on this.
I am ok with soldering and can easily purchase the resistor but is it a straight forward job?
Thanks