Midland 79-290 User Manual download pdf (Page 10)

L44, VR-13-AM PWR, TR32-AMC, VR12-ALC, VR5-FM DEV

Cobra HH-40 Handheld Radio

This handheld radio uses the LC7230 PLL, But as it is all surface mount components this

mod should only be tackled by persons who feel confident to do so :)..

Summery of mods :- RV-201 - `S` meter adjust, RV-301-`TX` meter adjust..

Am power :-L304,L305,L306,L307

Modulation (This is the hard part)..

Remove R243 (2K2 surface mount, marked `222`, black in color, just above the marking

`R243`

Remove C225 (0. 22uF surface mount, no number, tan in color, just below C226, which,

in turn is just belowe the `C226` marking.

Component Access And Identification

Remove the front and rear covers (4 screws). The frint cover (with the speaker)

stays attached by the speaker and mic leads.

On the back by the rear circuit board, you will find RV201 and RV301, and all the

inductor coils, all are identified with numbers printed on the circuit board.

On the front circuit board (the side with the LCD facing you), desolder the 4 pads

that ground the front circuit board to the case. Two of these have tangs that must be

bent poen to release the board. Remove the two screws on either side of the LCD

(friction fit only). Fold the front circuit board over and out of the way exposing the

front face of the rear board.

Orient the unit horizontally with the antenna jack facing to your left and the bottom

of the transformer visable on the right. The printed component numbers should read

right -side-up.Locate the markings `R243` and `C226` in the area near the lower -

left corner of the transformer.

Remove R243, which is black in color, vertically orientated, just above the

marking`R243` and to left of the `Q205` marking. It has `222` marked on it.

Sida

Comet's homepage

2004

http://www.geocities.com/SunsetStrip/Studio/7160/radio.htm

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Midland 79-290 User Manual Page 10