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Cable modem 315

Im having some trouble with some different types of modems RCA DCM 315 I'm looking for he scamatic power supply because it doesnt turn on.

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  • j_guillot Oct 13, 2008

    Im having some trouble with some different types of modems RCA DCM 315 I'm looking for he scamatic power supply because it doesnt turn on.

  • j_guillot Oct 13, 2008

    Im having some trouble with some different types of modems RCA DCM 315 I'm looking for he scamatic power supply because it doesnt turn on.

  • j_guillot Oct 25, 2008

    I still cant find an answer for my problem Im still trying to fix the RCA cable modem 315, But they're off at all times it doesnt turn on. Its not a power supply problem, its the actual modem.

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Take your modem on nearest electronic store they will gave you same votlage of power supply of your modem 

Posted on Oct 13, 2008

  • sandip panchal
    sandip panchal Oct 24, 2008

    take your modem on nearest electronic store they will gave you same votlage of power supply of your modem

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Hi, Any 12V DC of about 750 mA with a similar pin like this should be fine.
http://cachepe.zzounds.com/media/quality,85/brand,zzounds/fit,400by400/DNPRKPWA1-0bdb4ca99dc1c1528aefaa6141887696.jpg

I hope this is what you meant by power supply scheme.
:)

Posted on Oct 13, 2008

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Hi,

To my understanding:

  • Your concern repair cable modem(s) particularly RCA DCM315.
  • Your requirement schematic diagram of power supply.
  • The main issue, modem will not power up.
The power supply of most (but not all cable modem) is a wall adapter. Common output is 12 volts at about 1 ampere. The basic design is a small transformer, bridge or fullwave diodes and a capacitor. Newer designs uses an SMPS type. To my understanding, an RCA RCA DCM315 uses a similar adapter but not 12 volts @ 800mA. Internally, basic cable modem regulates the raw power from the adapter to 1.2, 3.3 and 5 volts. Most (but again not all) would be using a single chip CX24943 IC. This IC triggers the LED illumination. So, it may be that the cable modem is receiving power and regulating it, but if this IC will not trigger the LEDs, then in appearances, the modem will not power up making the problem not a power supply issue..

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Oct 13, 2008

  • Louie  Role
    Louie Role Oct 25, 2008

    Hi again,

    Your post on Oct 25 " Its not a power supply problem, its the actual modem".

    My post on Oct 13. "the problem not a power supply issue". Pls confirm if the RCA 315 uses an CX24943 IC If yes, have you checked for the presence of 1.2, 3.3 and 5 volts ?



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Hi,

I hope the link given below will be useful........It has user manual and troubleshooting steps too........
click here

If the above doent solve the problem.....I request you to give a brief description of the problem....
Waiting for the comments........


Posted on Oct 13, 2008

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This are your model data

RCA DCM315

MODEL NUMBER: DCM315

STANDARDS

DOCSIS 2.0 Compliant

Field Upgradeable to 2.1 SW

RECEIVER

Downstream Modulation: 64/256 QAM

Frequency Range: 88-860 MHz

Channel Bandwidth: 6 MHz

Maximum Upstream Data Rate: 27/38 Mbps {64 QAM/256QAM}

RF Input Sensitivity: +15 to -15 dBmV

64 QAM:>23.5 dB, 256 QAM:>30dB: BER 1e-8

Input Impedance: 75 Ohms

TRANSMITTER

Frequency Range: 5-42 MHz

Upstream Modulator: QPSK/16QAM

Mainstream Upstream Data Rate: 38.00/38.00 Mbps (QPSK/16QAM)

RF Output Level: +8 to +58 dBmV

Automatic Level Adjust

Gain Control Range: 50 dB

Frequency Stability: ±5 kHz

Output Impedance: 75 Ohms

SOFTWARE FEATURES

Software Downloadable

Protocol Filtering: Ethernet & IP

SNMP Management: V2, V3

Security: BPI

LED Diagnostics: 5-Step LED

http Server (CM status)

SPECIFICATIONS

Dimensions: 5 4/5" H x 2 7/25" D x 6" W

Approx. Shipping Weight: 4 Lbs.

Operating Temp.: 0 to +40C

I/O INTERFACES

Ethernet 10 Base-T or 100 Base-T: RJ45-Autodetect

RF Connector: F-Type

Number of PCs Supported: 32

USB Port, OS Supported - Windows: 98SE, 2000, Me and XP

USB Port, OS Supported - MAC: OS8, OS9, and OS10

User Switches: On/Off & Reset


Your power supply model Number
SY-09080-17 Power Supply for RCA DCM315 Modems

Your compatible products

http://www.broadbandproducts.com/network_powersupplies.html


You can buy one here:

http://cgi.ebay.com/RCA-DCM-315-Digital-Cable-Modem-Stop-Renting-Plastic_W0QQitemZ200257152620QQcmdZViewItem?_trksid=p3286.m20.l1116

Posted on Oct 13, 2008

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Have a look at the link below for basic troubleshooting techniques for RCA modem

Troubleshooting DCM 315

Posted on Oct 13, 2008

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