Service Bulletin no. 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. When the transceiver is in the automatic battery saver mode, the noise pulses overcharge C348 on the RF board causing it to short. The supply current opens L218 and the foil trace at this coil. To protect the transceiver, a Zener diode will be used to clamp the SBR line.

Bill Phillips Eating For Life Pdf To Excel there. You can examine Kenwood TH-75E Manuals and User Guides in PDF. View online or download 2 Manuals for Kenwood TH-75E. Besides, it’s possible to examine each page of. Instruction manual 144/440 mhz fm dual bander 144/430 mhz fm dual banderth-d7e th-d7a sta con packet96bcondup 5 7 9 kenwood corporation b62-1004-20 (k,e) (a).

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). The Service Manual disassembly instructions will be required to perform this modification. Note: This modification has already been performed on models stating with serial number 007xxxx. Required part: 22V Zener diode (UZP-22B) This is an optional change that is not covered under warranty.

Time to perform this modification is 1 hour or less. This modification is read 919 times. TH-75A Intermittent memory loss Author: Kenwood Communication, inc. Service Bulletin no. 978 (8-8-1990) Some TH-75A owners have reported that the transceiver intermittently loses its memory channel information after transmitting. Other users have reported symptoms such as key board lock up after transmitting.

The following modification will re-configure the PTT input to the microprocessor to correct these conditions. Required parts: 33 Kohm chip resistor RK73GB1J333J 470 pF ceramic capacitor CK45B1H471K PTT tactile switch S40-1415-05 • Disconnect the battery and antenna. • Remove the three case screws and two battery plate screws. • Lift the front panel from the body of the transceiver and disconnect the two flex cables. To open the connectors push the tabs towards the flex cables and gently lift up. • Remove the 4 screws from the Control board inside the front panel. • Remove the 3 screws from the speaker mount.

• Carefully lift the Control board, PTT switch assembly, speaker, and mic element from the front panel. Do not break any wires. • Lay the Control board on a soft cloth to avoid scratching the LCD. • Locate chip capacitor C2 on the Control board. • Replace C2 with a 33 Kohm chip resistor. Download Free Bernard Lewis Islam And The West Pdf Creator. • Remove the protective coating from the foil between pin 58 of the microprocessor and chip resistor R8.

Presolder the exposed foil. • Size, cut, and bend the leads of the 470 pF ceramic capacitor and then install the component between pin 59 of the microprocessor and the ground side of the 33 Kohm chip resistor.

• Remove the screw from the PTT switch assembly and then remove the rubber PTT cover from the board. Be careful not to lose the black plastic plate that fits inside the rubber cover. • Remove the PTT switch from the board. • Cut the tabs off the bottom of the new PTT switch to allow the switch to lay flush on the board. • Install the PTT switch. • Assemble the transceiver.

Time required to perform this modification is 1 hour or less. This modification is read 1093 times. 3dgirlz Crack Password Protected more. Have you any tips, trick or modifications you can't find here, please them to me, or use the. Can't you find a mods, please don't e-mail to me. All mods i have is listed on this site.!