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C-Scope CS1200XD schematic

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  • C-Scope CS1200XD schematic

    If anyone can help with info on the above schematic it would be most appreciated.
    Many thanks.

  • #2
    can you give pics of the board? many thanks

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    • #3
      Hi, It has a power supply problem. The circuit is powered by a 12v battery supply. At the power switch, the 12v is present and feeds a 5v positive voltage regulator but its output is measured at +11v. instead of +5v. There is another 5v negative regulator and the same applies there. I have replaced the first 5v. ic but is has not made any difference and a cold test of the other larger 5v negative does not show any signs of been damaged. With a double sided pcb and so many ICs, its not only time consuming but extremely difficult to follow any test pattern.
      I am attaching pics of the pcb.Click image for larger version

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      • #4
        Any thoughts about this?

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        • #5
          can you send me High resolution pics into email? your light is good but i suggest to do
          pics under sun at open air. we are not prof cameramen having a kit of light sources but light conditions will be near to good then.


          [email protected]

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          • #6
            [QUOTE = nalag46؛ 296161] أي أفكار حول هذا؟ [/ QUOTE]

            can you send me better pictures please
            qedqad@gmail.com

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            • #7
              It is a double sided circuit board which is not easy to photograph in detail. Would you be able to offer any recommendations or likelihood of fault, or are you just looking for the board's component layout?

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              • #8
                look cscopex schematic in C-SCOPE folder. no sch for 1220XD but i see a similarity. anyway you can print it and draw yours
                measuring links by tester.

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                • #9
                  can you do Part List? i give an example as i see/present this yours home work.
                  Attached Files

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                  • #10
                    U2 4053
                    U4 TLC272
                    U5 4053
                    U6 TLC272
                    U7 CA3140
                    U8 CA31
                    U LM339
                    U9 LM358
                    U10 4013
                    U11 4053
                    U14

                    Comment


                    • #11
                      I am attaching some pictures (best I can manage) of different parts of
                      the circuit board to cover most of the components on it. I have found
                      that after replacing the + 5V Voltage Regulator U12, the output now with
                      a power

                      supply of 9V or 12v (this model is supposed to accept rechargeable and
                      alkaline batteries) varies between 6.6v and 7.5v at test point + 5V on
                      the board. This voltage is present at the input of all the chips
                      except for chip U14 (right behind the disc. pot at the front of the
                      board). This is a low power TLC555 timer and reads 11.5v at all the 7
                      pins except for the ground pin no.1. Could this be the fault I am
                      looking for?

                      abnormal but i do not see as you connect a tester. to measure impulse signal by trivial tester is unnormal, nonsense.
                      you have to use oscilloscope.

                      There is a protection diode (soldered across the pins at the back of
                      the board) but it's not damaged. I am also checking the pair of
                      transistors BC213 and BC184 feeding into it but I am hesitant about removing

                      components on a double sided board unless I am absolutely sure they are
                      dud. What do you think?

                      i still do not see whole part list of IC's. do not know what is U12. i grasp for what TLC555 is.
                      maybe for negative voltage power source or frequency modulation, can not understand.
                      luck information. the board in your hands, not in mine.

                      Comment


                      • #12
                        n46 can not write in forum, i will retranslate his emails

                        Hello again,

                        The thread on Geotech does NOT let me reply. I don't know why?

                        Components list:
                        U1-TLC272, U2-4053, UC-3LM339, U4-TLC272, U54053, U6-TLC272, U7-CA3140, U8-CA3140, U9-LM358, U10-4013, U11-4053, U12-7805. U13-7905, U13-TLC555.

                        Q1-BC184, Q2-??, Q3-J113, Q4-BC184, Q5-BC184, Q6-BC184, Q7-BC184- Q8 BC636, Q9-BC184, Q1O-BC214.

                        D1-4148, D2-4148, D3-4148, D4-4148, D4-ZENER 7V, D5-4148, D6-4148, D7/D8-BAT-BLUE?, D9/D10-4148, D12-4148.

                        ELEC. CAPS. CA18-100UF, CA20-10UF, CA21-100UF, CA30/31-200UF.

                        All Transistors, diodes and caps. have been tested (in circuit) no damage.

                        Comment


                        • #13
                          revised
                          U1 TLC272
                          U2 4053
                          U3 LM339
                          U4 TLC272
                          U5 4053
                          U6 TLC272
                          U7 CA3140
                          U8 CA3140
                          U9 LM358
                          U10 4013
                          U11 4053
                          U12 7805
                          U13 7905
                          U13 TLC555

                          Q1-BC184
                          Q2-??
                          Q3-J113
                          Q4-BC184
                          Q5-BC184
                          Q6-BC184
                          Q7-BC184
                          Q8 BC636
                          Q9-BC184
                          Q1O-BC214.

                          D1-1N4148
                          D2-1N4148
                          D3-1N4148
                          D4-1N4148
                          D4-ZENER 7V
                          D5-1N4148
                          D6-1N4148
                          D7/D8-BAT-BLUE Schottky?
                          D9/D10-1N4148
                          D12-1N4148.

                          CA18-100uF
                          CA20-10uF
                          CA21-100uF
                          CA30/31-200uF

                          Comment


                          • #14
                            Anatloy. U13 is Voltage Reg. L7905 and this is a new one I have fitted. U14 is the timer TLC555. There is only one TLC555 and the problem has to be between U13 and U14.

                            The components involved in this part of the circuit are D7 and D8 (both test ok) Then we have Q9 BC184 and Q19 BC214 (both test ok in circuit) The 220uf Q31 that is connected to the
                            U13 L7905 input pin 2, I have removed it and test 100% ok, so the problem, in my opinion, could be the TLC555??
                            I have been thinking about removing it but I haven't got a replacement and I wanted to check everything else before doing that as it is double soldered on the PCB and not easy to remove.
                            I will order a new TLC555 just in case.




                            On 24/09/2022 21:04, Anatloy Dirtymad wrote:
                            both TLC555? then both are CMOS, not NE555.

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