Author Topic: Sencore LC101 Schematic needed  (Read 1550 times)

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Offline mskobier

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Sencore LC101 Schematic needed
« on: June 15, 2015, 01:10:15 am »
All,
    This is a duplicate post from the one I posted over in the test equipment section. Figured everyone did not vist every section, so I'm posting again here in repair.

I just pulled my Sencore LC101 down from the shelf to use today. I haven't needed to use it in a couple of years. Anyway, its dead!. I get a momentary display upon turning it on, then nothing. No display, no LEDs, nothing. I checked the fuse and it was good. Just a beginning guess, but its probably the power supply. Anyway, I need a schematic or better yet a service manual for it. Can anyone help me out, or no where I can find a copy of the schematic?

Thanks
Mitch
 

Offline mzacharias

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Re: Sencore LC101 Schematic needed
« Reply #1 on: June 17, 2015, 01:11:26 am »
Mine had a display that would flicker and go out - it was a fixed voltage regulator. Don't remember which one - but it had a tall tab on it. Freeze mist helped to identify. Had to use an NTE part - it was a fairly unusual package.
 

Offline mskobier

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Re: Sencore LC101 Schematic needed
« Reply #2 on: June 17, 2015, 07:43:00 am »
Mzacharias,
Thanks for the reply. Unfortunately, my lc101 is completely dead with only a momentary flash of the display when turning on and off. At this point I don't have any idea where to start. Maybe this weekend, I'll open it up and do a little probing

Mitch
 

Offline Johnny10

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Re: Sencore LC101 Schematic needed
« Reply #3 on: October 18, 2015, 11:47:51 pm »
Did you ever repair your sencore unit?
DMM4050, HP 3561A, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, Fluke 181 Nanovoltmeter, Dos4Ever uTracer, Tek TDS7104, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, 1062LS101
 

Offline singapol

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Re: Sencore LC101 Schematic needed
« Reply #4 on: October 19, 2015, 02:43:54 pm »
 

Offline Sencoretech

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Re: Sencore LC101 Schematic needed
« Reply #5 on: October 21, 2015, 07:51:28 am »
Mzacharias,
Thanks for the reply. Unfortunately, my lc101 is completely dead with only a momentary flash of the display when turning on and off. At this point I don't have any idea where to start. Maybe this weekend, I'll open it up and do a little probing

Mitch

I'd check your supplies, I'm guessing one of the filter caps when out and you have too much ripple. 

Common failures I use to see are:  IC32, IC33 and TR8.  All are located on the top board.
 


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