Waris HT Power On Issue

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[category:Waris]

This is a problem I've seen an HT1250 200 MHz

  • With battery on, but power switch off, radio cannot power up when switched on
  • With battery off and power switch on, radio will power up when battery connected
  • with battery off and power switch off, radio will boot, then immediately power down when battery connected.
  • With battery on, power switch on and battery on, radio will power off when switched off


The CPU measured the battery voltage from MECH_SWB+ line. If it goes low, it begins an orderly shut down of the CPU and radio systems.

Upon MECH_SWB+ the radio

Things we know are working based on these issues:

  • Mechanical switch (it shuts the radio off)
  • Q400, U400 regulator and switch between SWB+ and USWB+
  • Q405
  • CR440 (at least half of it)
  • U404 ASFIC
  • CPU Analog input
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