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Channel Master Digital Analog Converter Box CM-7000

Channel Master Digital Analog Converter Box Model No. CM-7000, Has A Module D2A_R12, Manufactored By DeltaCom Electronics LTD. 03.DEC.2007, Has A Part With m1100 16V, ; I Checked Other Parts Identical, And They In Both Directions Give A Reading, But E1 In Both Directions Goes Infinite. What Is This Part And Where Can I Buy This Part. Now Remember All The Others E2, E3, E4 etc. Gives A Reading. Also Have Checked All Fuses(All Good) F1 - F5, FF1 - FF2, FT1 - FT2, FW1 - FW2 etc. Unit Has Red Power Light But Does Not Turn On When I Push Power Button Or With Any Remote Control.

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E1 is a 100 uF 16 VDC capacitor. I have been repairing these units lately and have experienced some of the same symptoms (LED goes red but doesn't transition to green after 30 seconds like it should). I have been able to repair some of these units. Make sure the power supply is working properly before spending significant time on the D2A board. The power supply is responsible for supplying 12, 5, and 3.3 VDC to the D2A board. A defective PS will measure 14.5 instead of 12, 6 instead of 5, and 2.9 instead of 3.3. The AC ripple should be about 5 mV on the 3.3 and the 5 volt supplies when loaded. The 12 volt can be as high as 50 mV on a good PS. The culprits are C12 (1000uf) and C10 (470 uf) which are the filter capacitors for the 3.3 and 5V outputs respectively. C12, the capacitor for the 3.3 V output is especially critical because it is used to feed the voltage regulator and overvoltage shutdown circuit. D7 is a hot part and can also fail sometimes. I have repaired 50% of my units just by changing these capacitors. I still have units where the D2A board is bad with a known good power supply. If anyone has more info on the D2A (like a schematic) please pass it along

Posted on Sep 06, 2012

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This is a common problem. There are several capacitors on the power supply and logic board that are bad. Replacement of these parts has restore all units that I have looked at.

On the power supply I would replace at a minimum:
C14 - 4.7ufd 50v UPW1H4R7MDD
C4 - 1ufd 50v UPW1H010MDD
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There are 4 others in the supply that were not grossly bad.
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Logic board:
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E6 - Same as E5

Part Numbers of replacement caps are Nichicon or Panasonic.

Note: Caps on the logic board are extremely hard to replace due to the internal ground plane.

Contact me if this is beyond your skills for possible repair.

Nov 06, 2011 | Digi Channel Master/tal to Analog...

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I have a Channel Master cm-7000. It won't turn on. The red light is on it won't turn on with the remote or by pushing the on button. I tried unpluging it and pluging it back in and all that happens...


This is a common problem. There are several capacitors on the power supply and logic board that are bad. Replacement of these parts has restore all units that I have looked at.

On the power supply I would replace at a minimum:
C14 - 4.7ufd 50v UPW1H4R7MDD
C4 - 1ufd 50v UPW1H010MDD
C8 - 100ufd 25v UHE1E101MED
C10 - 470ufd 16v UHE1C471MPD
C12 - 1000ufd 10v UHE1A102MPD

There are 4 others in the supply that were not grossly bad.
C1 - 22ufd 400v EEU-EE2G220
C7 - 220ufd 25v UHE1E221MPD
C11 - Same as C10
C13 - Same as C10

Logic board:
E5 - 33uf 35v EEU-FM1A471
E6 - Same as E5

Part Numbers of replacement caps are Nichicon or Panasonic.

Note: Caps on the logic board are extremely hard to replace due to the internal ground plane.

Contact me if this is beyond your skills for possible repair.

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This is a common problem. There are several capacitors on the power supply and logic board that are bad. Replacement of these parts has restore all units that I have looked at.
On the power supply I would replace at a minimum:
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There are 4 others in the supply that were not grossly bad.
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Logic board:
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E6 - Same as E5

Part Numbers of replacement caps are Nichicon or Panasonic.

Note: Caps on the logic board are extremely hard to replace due to the internal ground plane.

Contact me if this is beyond your skills for possible repair.

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1 Answer

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This is a common problem. There are several capacitors on the power supply and logic board that are bad. Replacement of these parts has restore all units that I have looked at.

On the power supply I would replace at a minimum:
C14 - 4.7ufd 50v UPW1H4R7MDD
C4 - 1ufd 50v UPW1H010MDD
C8 - 100ufd 25v UHE1E101MED
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C12 - 1000ufd 10v UHE1A102MPD

There are 4 others in the supply that were not grossly bad.
C1 - 22ufd 400v EEU-EE2G220
C7 - 220ufd 25v UHE1E221MPD
C11 - Same as C10
C13 - Same as C10

Logic board:
E5 - 33uf 35v EEU-FM1A471
E6 - Same as E5

Part Numbers of replacement caps are Nichicon or Panasonic.

Note: Caps on the logic board are extremely hard to replace due to the internal ground plane.

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