Gm340 Service Manual
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Hi can any body help. I am trying to repair a GM340 that someone has connected to a battery the wrong way around with no fuse! I have replaced the protection diode and Q3411 & Q0661.
The radio now switches on and receives OK however it does not Tx (Tx led on and current draw 500mA). My question is what is the chance of the PA device u/s as I cant do any meaningful test because when the cover is removed the radio cannot Tx anyway! All voltages seem OK and resistance measurements all look sensible.
Gm340 Service Manual
I fix radios all day but this one has me flummoxed is their a special jig to simulate the cover being on in order to fault find? Look for a burned track look for +12v supply to p.a its more likely the driver transistor has gone look for anything common to a 12v supply and not further back in the mixer a quick test using a scope will reviel if there is drive locked frequency post mixer to the driver transistor the 12v usualy is common to both the pa and the driver and often there is a series diode in the p.a somewhere to previent this type of damage ive found this problem to be a burned choke usualy a white box or blob type with two dots 2pin choke in series with the 12v supply to the driver and or pA.
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Motorola Gm340 Service Manual
Thanks for your help. 12 volt supply to PA is OK. No burned tracks (apart from where the reverse diode got very hot). As its a multi layer board there could be a track gone that I cant see. I cant make any RF measurements because the radio will no longer work in Tx when the cover is removed (I have proved this with a good one) I think that it may cause the VCO to unlock. The driver has its own 9 volt regulated supply and thats OK.
Motorola Gm340 Service Manual Pdf
I could probably identify the offending component if I could work on it with cover off by tracing the drive with my diode probe. Most of the chokes are of the open coil type or wire with a ferrite bead and they are all OK. I am quite surprised at the small amount of physical damage given the abuse its taken I have the service manual buts thats as far as I have got.