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Old 25th November 2012, 07:31 AM   #61
manina is offline manina  Germany
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Quote:
Originally Posted by Perry Babin View Post
Pins 8, 11 and 12 should be at the same voltage. Re-check to see if there was an error when measuring or if the voltage is actually lower on pins 8 and 12.
My mistake - pins 8, 11 and 12 all read the same 14,5V with an input voltage of 13,5V and output of 6,2
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Old 25th November 2012, 01:29 PM   #62
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What is the DC voltage across D1?

Is R11 within tolerance?
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Old 26th November 2012, 03:51 PM   #63
manina is offline manina  Germany
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R11 is OK

I measured D1 with and without the lamp connected. Is it normal I read voltage if I place the black probe on the cathode (red on anode) and on the anode (red on cathode)? The only difference is that is either positive or negative.

Anyway, with no lamp, the voltage is 16,9V while with lamp is 15,9V. This is without the jumper on IC2 pins 3/7.

With the jumper, voltage is 13,4 without lamp and 13,1 with lamp.
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Old 26th November 2012, 04:17 PM   #64
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That's a 30v Zener. Is the installed diode a 1N4751?

Has it ever been replaced?
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Old 27th November 2012, 06:43 PM   #65
manina is offline manina  Germany
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If I turn on the MBR70 without any load (no lamp), the voltage across D1 is 26,2V however, as soon as I connect the lamp, it drops to the values previously posted.

D1 is still the original one.
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Old 27th November 2012, 08:18 PM   #66
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What is the DC voltage loaded and unloaded on the striped end of D2?
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Old 28th November 2012, 09:00 AM   #67
manina is offline manina  Germany
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Without load is 29.2V while with load is 17.3V
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Old 28th November 2012, 03:00 PM   #68
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Does the DC voltage on IC1, pins 12 and 8 drop significantly from unloaded to loaded?

Do you have a scope?
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Old 29th November 2012, 07:22 AM   #69
manina is offline manina  Germany
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Pin 8 and 12 of IC1 has no significant voltage change.

I have a scope but a limited knowledge on how to use it
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Old 29th November 2012, 01:08 PM   #70
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Post a link to the owner's manual for the scope or post a good quality photo of the front of the scope.
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