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Need schematic for Tenma 72-585 signal generator

Jimigunne

Jul 27, 2020
1
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Jul 27, 2020
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Got it for cheap on ebay but oscillator is dead....no rf. I have googled it, but i could only find the operating manual for a bk2005b. It operates and appears to be the same, but there could be circuit differences. Thanks!
 

PETERDECO

Dec 19, 2019
239
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Dec 19, 2019
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239
Do a google for "schematic diagram for LSG-16 signal generator" and the first match at the top is the owners manual and schematic. Supposedly they're identical.
 

bertus

Moderator
Nov 8, 2019
3,381
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Nov 8, 2019
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3,381
Hello,

Have a look at the attached PDF.
Page 9 shows a schematic.
There are however no details on the coils.

Bertus
 

Attachments

  • Tenma 72-585 RF Generator Operation Manual.PDF
    504 KB · Views: 22

73's de Edd

Aug 21, 2015
3,637
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Aug 21, 2015
Messages
3,637
On power up, does the LED pilot light on the unit illuminate ? ( Suspicioning that D3 15V zener regulator possibly might be dead shorted.)

If it does so, then with the unit in the #2 function mode, is there being a fixed frequency audio output from the unit, down at the C14 neg output leads connector ? ( Confirming that Q4 transistor is gettting DC power and then oscillating within the audio spectrum. )

Staying in the #2 function mode, what are the voltage values present on the C-B and E's of Q2 and Q3 transistors ?
 
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