| Author |
Message |
    
Mrblack
Junior Member
Username: Mrblack
Post Number: 39
Registered: 2-2002
| | Posted on Saturday, November 27, 2004 - 12:16 pm: | 
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It was give to me for parts but I would like fix it.
When I turn it on it will not receive then in about a minute it will start to receive.
Also when the volume is turned up loud it will squeal.
When on without receive I can hear a hiss sound from the speaker and the rf gain has no effect but the squelch does work.
When the receive works the rf gain works.
Thanks for any help.
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Bulldog369
Intermediate Member
Username: Bulldog369
Post Number: 218
Registered: 2-2004
| | Posted on Sunday, November 28, 2004 - 7:23 am: |
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i would check IC4 the audio transistor for a cold joint or a bad trace. |
Mrblack
Junior Member
Username: Mrblack
Post Number: 40
Registered: 2-2002
| | Posted on Wednesday, December 01, 2004 - 10:51 pm: |
|
Checked audio chip and found low voltage on pin 9
does this tell me this is a bad chip
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Viking
Intermediate Member
Username: Viking
Post Number: 172
Registered: 2-2002
| | Posted on Thursday, December 02, 2004 - 11:04 am: |
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With the low voltage on pin 9: check IC5, pin 1 for 8 volts. If it doesn't have 8 volts, C66 may be shorted. If it does, IC5 may be bad.
IC5 voltages
1- 8.05
2- 13.78
3- 8.05
4- 0
5- 13.78
6- 8.05
7- 0
8- 0
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