Crunch GTX3000D

[KriszXJR]

Crunch mono help please

I have a Crunch amp, but all power fets (FQP65N06) burned.
The driver board too...
I will replace fets, but what parts replace in the driver board?
What is the reason that (BE 317) burned?
Marked BE317 transistor similar?
Marked T4 diode similar?
Marked G1 transistor similar?
Replace FPQs to STP60NF06?
Please help me Perry 🙂
Many thanks!
(Sorry for my english)

 

[Perry Babin]

BE is the marking. It's a 2SB1260.

I don't see any reference for the diode but the 1ss355 is commonly used in this location. The 1N4148W-V may also be a good sub.

I don't know what the G1 transistors are.

I'd use the original FETs if they're available.

 

[KriszXJR]

BE 2SB1260
BF 2SB1308
82 2SC5009
G1 MMBT5551
Is this correct?
And T4 is 1N4148W

 

[Perry Babin]

Where is the BF transistor? Do you mean DF (2SD1898).
http://www.mccsemi.com/up_pdf/2SD1898(SOT-89).PDF

There are different codes for the same part from different manufacturers. After a bit of searching, it seems that the components from MCC seem to fit at least 2 or the parts.

T4:
http://www.mccsemi.com/up_pdf/1N4148WX(SOD323).pdf

G1:
http://datasheet.octopart.com/MMBT5551-TP-Micro-Commercial-datasheet-11755538.pdf

For Q11, a 2SC2412k is generally used there.

 

[KriszXJR]

Sorry, yes DF.
Many thanks!
I search components, but Hungarian distributors not 1260 and 1898.
But I think BCX53 and BCX56 are good.
I can order that components.
Can I replace BE -> BCX53 and DF -> BCX56?

 

[Perry Babin]

I think that they will be suitable replacements but I've never tried them.

 

[KriszXJR]

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

My schematics is correct??

 

[KriszXJR]

Images url:
http://kepfeltoltes.hu/view/130319/DSCF2591_www.kepfeltoltes.hu_.jpg
http://kepfeltoltes.hu/view/130319/DSCF2592_www.kepfeltoltes.hu_.jpg

Please!

 

[Perry Babin]

That's correct. This is a similar board.

 

[KriszXJR]

Many thanks!
In my sch no gnd.

 

[Perry Babin]

The collectors of the transistors are connected to ground under the tabs of the transistors. The center leg is connected to ground through the transistor.

 

[KriszXJR]

I replace Fets (to IRF1010E) and BE (to 2sb1123t) transistors, but the ps not start.
The total current ~200mA
(supply voltage 12,5V)
All Fet voltage in G leg is 0V, D: 12,5V, S: 0V
Driver board voltages:
1: 0,79V JRX
2: 90mV Comp
3: 90mV U1_3
4: 12,5V
5: 11,8V
6: 0V GND
7: 12,5V
8: 4,45V E2
9: 4,45V E1
10: 3,65V TH
11. 0V Prot
And relay clicking, but power and protect led no light.

 

[KriszXJR]

And i replace in driver board two T4 diode to LL4148....

 

[Perry Babin]

Are E1 and E2 directly connected to the emitters of the two BE transistors?

If so, they should go to the gate resistors for the power supply FETs.

 

[KriszXJR]

Yes!
On amp pcb - before driver board - have c3198 (Q7) and a1266 (Q6). ???

An externally hosted image should be here but it was not working when we last tested it.

 

[Perry Babin]

Post a photo showing Q6/7.

 

[KriszXJR]

I signed.

An externally hosted image should be here but it was not working when we last tested it.

 

[KriszXJR]

Have you Perry schematics from this amp, or MB Quart DSC1500.1 ? (MB Quart DSC same as Crunch GTX)

 

[Perry Babin]

I don't have any schematics that are the same as this amp.

Do have 12v on the collector of the NPN driver transistor on the main board?

 

[KriszXJR]

I measured the voltages. Signed in photo. Thanks!!!

An externally hosted image should be here but it was not working when we last tested it.