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Old 8th January 2013, 03:20 AM   #81
locky_z is offline locky_z  China
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I have heard that a Chinese tracers users measured 2sk135 is also same as you, but 2sk1058 on this phenomenon.
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Old 8th January 2013, 03:18 PM   #82
mos57 is offline mos57  Italy
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Quote:
Originally Posted by locky_z View Post
I have heard that a Chinese tracers users measured 2sk135 is also same as you, but 2sk1058 on this phenomenon.
See the .CUV file for 2SK1058. Condition test as before: N-MOS; Vds Vs Id, Vds=36 V; RB=6k; RC=75
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File Type: zip 2SK1058.zip (16.9 KB, 9 views)
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Old 8th January 2013, 11:54 PM   #83
locky_z is offline locky_z  China
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Try to set options->Config->'Voltage Drop(sink)' to 2.5 or 3 , and try again.
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Old 22nd January 2013, 01:19 PM   #84
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Locky,
No Vcc2 on collector of Q1 and 2. I have replaced Q2-4 and still no Vcc2 on collector of q1. I have not replaced q1, as i do not have any. You mentioned Q7 being a possibility, but I do not have a part number and it is a position that is difficult to see. Would you mind giving that to me so I can get it on the way.
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Old 23rd January 2013, 01:35 AM   #85
locky_z is offline locky_z  China
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The power supply to Vcc2 by PMOS//R20,
The Vcc2 have some voltage unless Q1-Q4 is shorted or R20 is break.


Click the image to open in full size.

Q7 is the 'pnp',it between R48 and R50.
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Old 23rd January 2013, 02:02 AM   #86
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Ill replace Q1 and go from there. Thanks.
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Old 23rd January 2013, 04:48 AM   #87
locky_z is offline locky_z  China
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To determine Q1~Q4 is shorted,you can measure Q1~Q4 Collect-Emitter resistor on board.
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Old 31st January 2013, 12:01 AM   #88
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Locky,
i have replaced all fets. Vcc can be measured across Q2 but not Q1. Replaced Q7 with bc5xx. Still have over current lit. The base of Q7 is at supply voltage.
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Old 31st January 2013, 02:03 PM   #89
locky_z is offline locky_z  China
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Q2 Q3 collect connect Vcc2
Q1 Q4 collect connect GND
Click the image to open in full size.




The over current led light, the reason may be:
Click the image to open in full size.

1.Q7(2sa970) C-E is shorted or turned on
2.PMOS G-S is shorted.

if the Vcc2(Q2/Q3collect voltage) is near Vcc, but over-currebt led still light.this mean there are no over current.
Then you can short the portect_sw( it is near the over-currect led,but not install),the sw will short Q7 B-E,If Q7 is ok,then Q7 will cutoff, and the led will not light.
If LED still light, may PMOS G-S is short.
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Last edited by locky_z; 31st January 2013 at 02:08 PM.
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Old 31st January 2013, 03:03 PM   #90
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Thank You Locky, The schematic and explanation helps.
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