Channel Master CM-7500 DVR+

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • reeferman
    New Member
    • Feb 2013
    • 9
    • USA

    #1

    Channel Master CM-7500 DVR+

    Would anybody happen to have the schematic and component listing?
    I'm replacing U5 real time clock IC MCP7940M-I/SN and would like to check the associated components.

    Thanks in advance
    Phil
  • reeferman
    New Member
    • Feb 2013
    • 9
    • USA

    #2
    Re: Channel Master CM-7500 DVR+

    I replaced U5 IC MCP7940M-I/SN (58 cents @ Mouser) and it is now keeping perfect time.

    Comment

    Related Topics

    Collapse

    • eccerr0r
      old X58 triple channel board... memtest86 memory speed?
      by eccerr0r
      Anyone run memory speed tests with an old X58-based triple channel 1st gen or any other >2 channel board? The one I have is a Gigabyte I think.

      Anyway I had four 4GB DDR3-1333 modules in the 6 memory slots and got around 11GB/sec memory speeds assuming that it went dual channel since it didn't have enough modules for triple channel. Now I stuck in two more 4GB modules, but they are DDR3-1600. I'm still getting 11GB/sec speeds according to memtest86...

      Just wondering, anyone do memory speed analysis on these triple (and higher) channel memory boards? Are there any...
      06-28-2025, 09:06 AM
    • spleenharvester
      Reverse engineering of 18650 4-channel tester
      by spleenharvester
      Hi friends

      I have reverse engineered this tester, schematic is attached and is complete except for capacitor values. These testers annoyingly have no model number but they are the ones you find on the first page of just about any website if you type in "18650 4-channel tester". There is also a 2-channel variant and a newer 8-channel variant. They are very cheap (about £15) and can measure voltage, current, internal resistance and capacity. They have a multicolour display for all these statistics. They also have terminal blocks so that if you want to use a breakout board...
      05-04-2025, 02:43 AM
    • afminguela
      No signal right output master channel - TRAKTOR KONTROL S4 MK1
      by afminguela
      HI,

      i have a S4 MK1 and suddenly don't have signal at the right channel main output, both in rcd and trs outputs.

      One day I was plugging all the set ( Macbook air+ traktor kontrol) and when I play the first song, right channel was silent.

      i made all the silly checklist (SW mapping, connectors, swapping channels...etc)
      and I concluded that is a hardware issue.

      As both physical outputs are affected, I suppose it's something at the mainboard BEFORE the split. No item seems to be burned, or broken, at sightsee.

      Does...
      05-11-2023, 05:58 AM
    • dicky96
      American Audio VLP1500 Distorting on one channel
      by dicky96
      Hi guys I have a VLP1500 amplifier here - one channels works fine and the other channel distorts even at low volume settings

      Protection and Clip LED are off

      There is something wrong with the BIAS voltages around T16 and T18 (in particular) on the bad channel

      I tested all diodes and transistors in this area in circuit with diode mode - both channels seem identical. Same in resistance mode across all the resistors here.

      The output DC voltages on pin1 and pin8 of the 5532D dual op amp at the input of each amplifier module are the same, and the audio...
      07-13-2022, 05:25 AM
    • dicky96
      Hitachi V19B01922 Channel Tune problem
      by dicky96
      Hi Guys
      I have a customer who has two Hitachi TVs in his bar, one is the model in the thread title and the other is a larger screen but has the same setup menu

      He also has an LG TV, so three screens in the bar

      I installed three Satlink ST-6503 DVB-T Modulators
      This model https://www.aliexpress.com/item/32916553905.html

      These connect to three satellite receivers via HDMI cables and then connect to a 4 way RF Amp that connects to the TVs on aerial cable. There is no incoming terrestrial antenna. I set the channel ID on the modulators to...
      02-09-2023, 09:20 AM
    • Loading...
    • No more items.
    Working...