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Electronics => Repair => Topic started by: piotekp90 on October 09, 2018, 09:31:22 am

Title: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
Post by: piotekp90 on October 09, 2018, 09:31:22 am
Hi,
Does anybody know the inductance of the L500, L501, L502, L503 inductors in the A9 output board in HP 6812A ac power supply?
I have this power supply but I see that this inductors have cracked cores and I would like to replace it.
Title: Re: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
Post by: Chris56000 on October 09, 2018, 09:52:43 am
Hi!

I wouldn't have thought they'd be much more than 40–100uH each about 3A rating – there's full component–level circuit diagrams in the service manual by the way!

Post clear pictures of the chokes please – it might help us identify replacement core kits you can use to repair them!

Chris Williams

PS!

Have you got one of those little cheap and cheerful Component Testers,?
Title: Re: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
Post by: piotekp90 on October 10, 2018, 11:54:23 am
At the beginning I have checked the service manual and schematic but there is no information about the choke value. If I put the part number on Keysight website I recive an information that this is obsolete part (without any more information about the choke).

I measured the chokes and they have around 100uH.
Title: Re: HP/Agilent 6812A A9 output board L500, L501, L502, L503 values
Post by: piotekp90 on October 12, 2018, 07:54:53 am
I have received informatin from Keysignt about this inductors:)



E CORE; 12.6 MM WIDE; 20.5 MM HIGH; 29.2 MM LONG; 1 SECT; FR MATL; 12 PINS; RECT. HOLE. BOBBIN-COIL FORM E CORE; 12.6 MM WIDE; 20.5 MM HIGH; 29.2 MM LENGTH; RECTANGLE HOLE SHAPE; 1 SECTION; APPLICATION : M 42/20; MATERIAL: REINFORCED NYLON 6/6 TO UL94VO; NO. OF PINS: 12 (2X6)

Inductance: 93-101uH @5V ocv. 100kHz 1.2 to 5.6