Weather/FM/AM Walkman SRF-M37W US Model

Sony Corporation; Tokyo

Data
Forum
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Collections

  • Year
  • 2008 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 329591

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Main principle
  • PLL, Phase-locked loop; ZF/IF 450/10700 kHz
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Power type and voltage
  • Dry Batteries / AAA 1.5 Volt
  • Loudspeaker
  • - only for Earphone!
  • Power out
  • 0.0028 W (max.)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: Weather/FM/AM Walkman SRF-M37W [US Model] - Sony Corporation; Tokyo
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 83 x 63 x 32 mm / 3.3 x 2.5 x 1.3 inch
  • Notes

  • The SRF-M37W  Weather/FM Stereo/AM PLL Synthesized Radio is the US model.

    Main features:

    • 20 memory presets
    • Weather Band: 7 channels
    • FM: 87.5-108MHz, 100KHz Channel steps
    • AM: 530-1710KHz, 9 or 10KHz selectable Channel steps
    • Local/DX selectable Sensitivity for WB/FM
    • Clock with 12 hour format (am/pm)

    Besides this later M37W model, Sony did previously released other SRF-M37 model variants, and according to the user guides and Internet sellers these initial models were release around 2002:

    • SRF-M37 - Canadian Model, E Model (North and South America)
      • FM: 87.5-108MHz, 100KHz Channel steps
      • AM: 530-1710KHz, 9 or 10KHz selectable Channel steps
    • SRF-M37L - AEP Model (Other countries)
      • FM: 87.5-108MHz, 50KHz Channel steps
      • MW: 530-1610KHz, 9 or 10KHz selectable Channel steps
      • LW: 153-279KHz, 9KHz Channel steps
    • SRF-M37V - US Model
      • TV - 2-13 channels
      • Weather: 1-7 channels
      • FM: FM: 87.5-108MHz, 100KHz Channel steps
      • AM: 530-1710KHz, 9 or 10KHz selectable Channel steps 

    These SRF-M37 model variants share a common circuit base. The receiver PCB uses a Toshiba TA2154AFN 1.5Volt Tuner IC and a Sanyo LA4535M 1.5Volt Stereo Power Amp for Headphones IC. The Control Unit uses a Toshiba TC9329FA Portable Audio DTS Controller IC with specific firmware for each model variant, and two XC61CN08802NR Low Voltage Detectors IC's.

     

  • Net weight (2.2 lb = 1 kg)
  • 0.094 kg / 0 lb 3.3 oz (0.207 lb)
  • Author
  • Model page created by Jose Mesquita. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model Weather/FM/AM Walkman is part of the collections of the following members.

 Forum

Forum contributions about this model: Sony Corporation;: Weather/FM/AM Walkman SRF-M37W

Threads: 1 | Posts: 1

Got two of these Sony series, both with a common issue related to broken PCB copper traces in the VT tuning section.

One being this later 2008 SRF-M37W US model, and the other is the SRF-M37V US model from 2003.

Despite the large dates interval, both share the same original SRF-M37 chassis, where the major difference being the firmware version used in the TC9329FA DTS / MCU to control and generate different RF bands.

Both units, despite separated apart by at least five years, have developed the same fault, despite showing distinct symptoms when trying to tune a radio station. One was "auto-scanning" the radio stations ignoring any input from the tuning buttoms; the other just did not tune any station. This happened on all bands.

Both had a good DC-DC converter VT at 14VDC. A few additional voltage readings made me suspect of broken PCB copper traces. A systematic continuity check did confirm the issue. On both radios the open circuit was at the PCB pads of SMD resistors or capacitors.

The easy fix was to re-solder the pads. No adjustment was needed, as the units did tune known stations at the correct display frequencies.

 

Jose Mesquita, 23.May.21

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