Required part: 22V Zener diode (UZP-22B) This is an optional change that is not covered under warranty. Note: This modification has already been performed on models stating with serial number 007xxxx. The Service Manual disassembly instructions will be required to perform this modification. The Zener should be solder between the SBR side of L218 and the shielding case of L221 on the component side of the RF board (X53-3370-11) (A/3). To protect the transceiver, a Zener diode will be used to clamp the SBR line. The supply current opens L218 and the foil trace at this coil. When the transceiver is in the automatic battery saver mode, the noise pulses overcharge C348 on the RF board causing it to short. 957 (9-1-1990) When the TH-75A is connected to a vehicle battery, ignition or alternator noise can be induced on the DC line.
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