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Pioneer SA-1040 Amplifier : RESISTOR (R592 - .33X2/5W) Making Smoke and getting super
Pioneer SA-1040 Amplifier : RESISTOR (R592 - .33X2/5W) Making Smoke and getting super
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Old 21st May 2020, 08:22 AM   #11
mbz is offline mbz  Australia
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Join Date: Jul 2013
Wanting to measure resistance between Q532 Collector and any leg of R592.
Repeat for Q526 collector and R592. The metal flange/base of the transistor is also the collector so it's a easy measurement point.
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Old 21st May 2020, 08:37 AM   #12
smarthawk is offline smarthawk  Canada
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Join Date: Apr 2020
Location: Brampton, ON
ok great, thanks mbz, let me get back you with the results. regards.
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Old 21st May 2020, 08:59 AM   #13
smarthawk is offline smarthawk  Canada
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Join Date: Apr 2020
Location: Brampton, ON
Wanting to measure resistance between Q532 Collector and any leg of R592.
on 200 ohms settings on the meter and connected the node with transistor's collector, the value shows up as 00.3 on first leg, 00.6 and second leg and 00.9 on third leg of the resistor.

Repeat for Q526 collector and R592.
on 200 ohms settings on the meter and connected the node with transistor's collector, the value shows up as 00.3 on first leg, 00.7 and second leg and 00.9 on third leg of the resistor.

If i set the multi-meter on diode setting then all the values shows up as zeros with a beep sound.

Last edited by smarthawk; 21st May 2020 at 09:07 AM.
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Old 21st May 2020, 09:30 PM   #14
mbz is offline mbz  Australia
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Join Date: Jul 2013
Results suggests Q532 and Q526 have failed (c-e) short. If you have any doubt about the test then you can redo but measure from the middle leg of the transistor to R592...


Next step is to check for other damage.
R592 looks ok.
Diode test Q528, 530, 522 and 524
Also Q602, 604, 614, 616
Diode test D602, 604
Resistance test R588, 590, 586


Refer to previous graphic on diode testing, all tests with amp powered off/unplugged.
Visual check "all" components in the area for signs of stress, eg, discoloured/charred resistors...
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Old 21st May 2020, 09:44 PM   #15
MAAC0 is offline MAAC0  Portugal
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Join Date: May 2010
Before doing anything else in order not to make more damage build a bulb limiting device. 100W filament bulb in series with the amp.
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Old 21st May 2020, 10:15 PM   #16
mbz is offline mbz  Australia
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Join Date: Jul 2013
^^^^ Agree, a Dim Bulb Tester will be required at first power up after parts replacement.
Google for plans...
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Old 22nd May 2020, 05:57 AM   #17
smarthawk is offline smarthawk  Canada
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Join Date: Apr 2020
Location: Brampton, ON
Ok guys mbs and maac0 both, much appreciated. let me test these parts and replace if required, will let you guys know before i try to attempt test using bulb limiting device. stay tuned.
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