Waris HT Power On Issue
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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
