Sony CRF-230 Service Manual Download | Manualshive

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Summary of Contents for CRF-230

Page 1: ... v v SOhTY SERI ICE MANUAL 1 ...

Page 2: ...Adjustment 24 3 7 LWMWSWI Frequency Coverage and Tracking Adjustment 26 3 8 SW2 SWl9 lst I f Alignment Frequency Coverage and Tracking Adjustment 27 TABLE OF CONTENTS Page Section Title Page 3 9 SW2 SWl9 Frequency Coverage and Tracking Adjustment 28 3 10 Voltage and Current Adjustment 32 MOI NTING AND SCHEMATIC DTAGRAMS 33 4 1 Bfo Block BFO 1A 33 4 2 Jack Panel 34 4 3 Antenna Terminal 35 44 Fm Fro...

Page 3: ...m 9 5 l0 l MHz 31 m I 1 5 I 2 1 MHz 25 m 14 0 I 4 6 MHz 20 m 15 0 I 5 6 MHz 19 m 17 5 18 1 MHz 16 m 2l O 21 6 MHz l 5 m 21 4 22 0 MHz 13 m 25 5 26 1 MHz 1 I m 26 8 27 4 MHz ll m 28 0 28 6 MHz l0 m 28 6 29 2 MHz l0 m 29 2 29 8 MHz l0 m 10 7 MHz 455 kHz l st 1 6 2 2 MHz 2nd 455 kHz telescopic antennas 1 000 mm 2 pcs external antenna terminals 300o 75sl are provided built in ferrite bar antenna 100 x...

Page 4: ... 4OO Hz 30 modulation MW 37 dB at 60 dB input 4 n Hz 30 modulation LW 30 dB at 60 dB input OO Hz 30 modulatbn SW 44 dB at 44 dB input 4OO Hz 30 modulatioa U 77 dB 72 dB 60 dB 80 dB 70 dB 80 dB 30 dB at 77 MHz at 98 MHz at 1 605 kHz at 360 kHz at 2MHz at 2 5 MHz at 29 MHz SW I9 lm 20 000 Hz t3 dB flat rusponse 5ko 53 dB 1 7 mV at 50 mS ofiFt 5ko 14 dB 49 inv at 5 kn lood inpcdance 2 2 ko 5o dB 2 5 ...

Page 5: ...I 1 2 BLOCK DIAGRAM L_ F t t U t T q ss su s s s q EI d1 i l ol it r t1 l Y sl t EI l s i c J t t a I t o ts a ts t F s s t s c s o a r1 l l lr lo e F I t 5 Fig t l L L ...

Page 6: ...llator fre quency is above the signal frequency for the FM l band but below the signal frequency for the FM 2 band Because of this oscillator drift produces a detector dc output voltage change of difference polar ity on the FM l band than occurs on the FM 2 band Therefore dc control voltages taken directly from the detector output can not be used to stabilize the fre quency of the local oscillator...

Page 7: ...fied into negative d c voltage by diodes D207 and D208 This voltage cuts off transistor Q207 and eventually turns on transistor Q405 thereby enabling transistor Q404 to amplify the detector output The muting level can be adjusted by potentiometer R265 The muting level is usually set approximately 20 dB lower than the signal level If the receiver tuning is shifted within range B of Fig 1 4 the diff...

Page 8: ...cuit When bands SW2 through SWl9 are selected ceramic filter CF50l is automatically set to narrow bandwidth by switch 5501 Similarly when bands LW MW or SWI are selected a wide bandwidth is automatically selected Ceramic filter CF502 can be manually set to narrow or wide bandwidth by switch 5502 When set to SHARP switch 5502 also connects in the high ut filter consisting of coil L507 and capacitor...

Page 9: ...onverted into two beat signals upper and lower against the carrier frequency by heterodyne action The upper beat signal is eliminated by passing through the filter circuit and the lower beat signal is fed to the next stage as audio signals In the model CRF 230 the detector utilizes the square low characteristic output current propor tional to the square of the effective value of the input voltage ...

Page 10: ...ss y tuning x 38276 87 lever as y BFO Y 38521 01 l front end biock SW swc t t D1 1 501 1 01 1 E telescopic antenna SW 1 526 16U11 voltage selrctor 1 533 U8 fuse holder t 56 078 socket a plug 7 50902901 conn tor TAPE t 507 16913 jek AUX tN REC OUT MPX OUT EXTSP circuit board cp 501 103 12 telesopic antenna fm 1 401 34tj ant coil MW LW bar antenna 3 828 470 panel antenna 1 514 304 slide switch ROD E...

Page 11: ...e 1 507 r69 r3 jxk earphone t 222 t94 12 volume control MGC Bottom Y 3869001 l BFO block IBFO 1A mounted circuit board pounr supply Y 38553 Or 1 mounted circuit board af U Fis 1 lO Fig l 11 x 38276 94 mounted circuit board a m i f Y 38522 01 l front end block fm FMC l38A1 mounted circuit board regulator x 38276 90 dial indicator ass y sw t9 x 38276 92 dial indicator as v LMMWEWI x 38276 9 dial ind...

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