Weather/FM/AM Walkman SRF-M37W US Model

Sony Corporation; Tokyo

Données
Forum
Images
Collections

  • Année
  • 2008 ?
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 329591

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • Principe général
  • PLL (Phase-locked Loop, boucle à phase asservie); FI/IF 450/10700 kHz
  • Gammes d'ondes
  • PO et FM
  • Tension / type courant
  • Piles sèches / AAA 1.5 Volt
  • Haut-parleur
  • - Seulement pour écouteur
  • Puissance de sortie
  • 0.0028 W (max.)
  • Matière
  • Plastique moderne (pas de bakélite, ni de catalin)
  • De Radiomuseum.org
  • Modèle: Weather/FM/AM Walkman SRF-M37W [US Model] - Sony Corporation; Tokyo
  • Forme
  • Portable, appareil de poche. Taille < 20cm
  • Dimensions (LHP)
  • 83 x 63 x 32 mm / 3.3 x 2.5 x 1.3 inch
  • Remarques

  • 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.

     

  • Poids net
  • 0.094 kg / 0 lb 3.3 oz (0.207 lb)
  • Auteur
  • Modèle crée par Jose Mesquita. Voir les propositions de modification pour les contributeurs supplémentaires.

 Collections | Musées | Littérature

Collections

Le modèle Weather/FM/AM Walkman fait partie des collections des membres suivants.

 Forum

Contributions du forum pour ce modèle: Sony Corporation;: Weather/FM/AM Walkman SRF-M37W

Discussions: 1 | Publications: 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

Weitere Posts (1) zu diesem Thema.