SMPS repair with part No. HF100W-SB-13.8

Discussion in 'The Projects Forum' started by sanjay76, Jul 11, 2011.

  1. sanjay76

    Thread Starter New Member

    Jul 6, 2011
    4
    0
    Hi,

    I am trying to repair SMPS with part No. HF100W-SB-13.8.

    This SMPS can give O/Ps in two ways- first when connect AC mainsto it ( which is working fine i.e we get the required O/P when we connect AC mains to it)secondly when battery is connected it should give the required O/P (which it is not giving).

    P.S.

    1) I dont have schematics of this SMPS.
    2) Was not able to find data sheet of Transistor with marking on it as "K 940".
    3) This SMPS comes in two types - one in which two separate comprators (part No. LM393) are used and secondely in which one comparator (part no. LM393N) is used.
    4) The problem is found in only SMPS having two comparators.

    Please advise.

    Regards

    Sanjay
     
  2. debjit625

    Well-Known Member

    Apr 17, 2010
    790
    186
    Their is a minimum amount of voltage specification for both AC and DC to be input for the SMPS to it work properly.Whats that specification?
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
  4. sanjay76

    Thread Starter New Member

    Jul 6, 2011
    4
    0
    The specifications are:

    AC input 115v(85-132v) 2.8A
    230v(170-260v) 1.5A

    DC output V: 13.8v 6.0A
    BAT: 13.3 0.5A
     
  5. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    How many layers does this PCB have? If it's only two layers you can try to draw your own schematic of the parts that have a relation to this function.

    If not you can also post a picture of both sides of the pcb (in high resolution)
     
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