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uniden pc 66 XL no power
- Thread starter kaos513
- Start date
Its not over my friends,i get tx power at 2 watts but donot get audio and IC 1 TA7222AP gets very hot.also recieve works very well
Check bootstraps, Output Cap - polarity of it too. Supposed to run 1/2 rail voltage, so if cap went south - shorted, the rail sees a full 13.8 volt power supply rail and it's trying to drop 1/2 of it across itself internally...
Else look for a cap across Pin 3 - C501 on schematic, but it goes to chassis case - Chassis Ground - not foil ground.
How is the condition of Pin 3 ACROSS to Chassis ground? SHOULD NOT SHOW SHORT!
:+> Andy <+:
Else look for a cap across Pin 3 - C501 on schematic, but it goes to chassis case - Chassis Ground - not foil ground.
How is the condition of Pin 3 ACROSS to Chassis ground? SHOULD NOT SHOW SHORT!
:+> Andy <+:
LOL!
Ok, C63 Ripple Filter 47uf 25V, C59 - 4.7uf TANALUM C59 may be a likely culprit. C67 output cap 470uF 16V
And mare sure your boot straps are tied...
:+> Andy <+:
Ok, C63 Ripple Filter 47uf 25V, C59 - 4.7uf TANALUM C59 may be a likely culprit. C67 output cap 470uF 16V
And mare sure your boot straps are tied...
:+> Andy <+:
Guees I never sent this last night - WOW...
Yah! Yah!
Ok, when a radio starts to work, after any type power supply issue, these crop up. Weakened parts, they start to rear their ugly head.
Is - C67 that 470uF still ok?
That Tantalum at C59 is similar to what Cobra uses in their 25 line you can see their side of it here. At least a clearer copy of it ...
http://www.cbtricks.com/radios/cobra/25ltd/index.htm
Look over the PDF's they got -
Yah! Yah!
Ok, when a radio starts to work, after any type power supply issue, these crop up. Weakened parts, they start to rear their ugly head.
Is - C67 that 470uF still ok?
That Tantalum at C59 is similar to what Cobra uses in their 25 line you can see their side of it here. At least a clearer copy of it ...
http://www.cbtricks.com/radios/cobra/25ltd/index.htm
Look over the PDF's they got -
Ok, did they use a SPACER on the Audio Amp? It needs the tab to dissipate heat, but they use a MICA insulator.
:+> Andy <+:
:+> Andy <+:
