View previous topic :: View next topic |
Author |
Message |
Hellmuth Guest
|
Posted: Mon Oct 06, 2008 6:38 am Post subject: Technics ST-03C |
|
|
The so called AM Syntheziser part in this Tuner does not work correct.
when i use the Rxfreq. 549kHz - the LO moves to 1,4MHz (instead of nearly 1 MHz); What i found out is. that the varicapvoltage starts with +4Volts ( 522KHz) and jumping !! somtimes up to 15 or 18 Volts; But with an extern Pwr Supply the AM VCO tunes correctly from 2volts (RXfreq 522KHz) up to 15Volts ( rx freq 1600kHz) When i am using a seperate Rf generator with an output frequency at nearly 1,4 MHz , feed this one into the MN6045E - i found with the display set to 549KHz at the outputpin (3) at the MN6045E the he will indicates nearly a phase/ freq. comparement.
Is there any gentleman who could help ?
my Idea should be - the MN6045E must have a not known mistake
because the FM ( vhf) part works correctly
And I do not have any circuitdiagramm of these Tuner and I do not know the correct function of these MN6045E ( no datasheet available) |
|
Back to top |
|
|
|
|
|
You can post new topics in this forum You can reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
eServiceInfo on FB -
Service Manuals Free Download -
Service Diagrams
Free TV Schematics Download -
HARDW.net -
Pinout Master -
Jabse Service Manual Search -
Jabse.InK -
onTap.bg
SnimkiOt.com -
Poblizo.com : пътешествия
Latest Service Manuals :
INST64 NOKIA • aspire 8730 8730z 8530 acer • clevo d470v d480v sager np4780 Clevo • [radial thru-hole] UMH Series Samcon • dm130MVZ SCHM ALINCO • AZ3705 BA 1219895632 Philips • 6-5 Rolsen • t 590 DUCRETET THOMSON • Philips 22AC730 Philips • l2g 43 t Philips •
|