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Old 20th March 2013, 08:19 AM   #11
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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.
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Old 21st March 2013, 06:48 PM   #12
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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.
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Old 21st March 2013, 06:53 PM   #13
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And i replace in driver board two T4 diode to LL4148....
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Old 21st March 2013, 08:48 PM   #14
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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.
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Old 21st March 2013, 10:18 PM   #15
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Yes!
On amp pcb - before driver board - have c3198 (Q7) and a1266 (Q6). ???


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Old 21st March 2013, 11:42 PM   #16
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Post a photo showing Q6/7.
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Old 22nd March 2013, 06:43 AM   #17
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I signed.
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Old 22nd March 2013, 09:13 AM   #18
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Have you Perry schematics from this amp, or MB Quart DSC1500.1 ? (MB Quart DSC same as Crunch GTX)
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Old 22nd March 2013, 11:54 AM   #19
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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?
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Old 22nd March 2013, 08:29 PM   #20
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I measured the voltages. Signed in photo. Thanks!!!
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