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Looks like there is no data from the cpu. Check folowing points: * Check Q2026 for 5 volt on pin 4, on HF on reception, * Check Q2033 for 5 volt on pin 4, on HF on transmision, * Check Q2023 for 5

I would continue there will only be one fault. 73 Andrew ?Get BlueMail for Android ?

Check the voltages on J2001: 1 gnd 2 8V 3 5V J2002: 1 gnd 2 HR8 8V on reception HF 3 HT8 8V on transmit HF 4 VR8 8V on reception VHF 5 VT8 8V on transmit VHF 6 UR8 8V on reception UHF 7 UT8 8V on

Check the " VHF-VCO VCV check " and the " UHF-VCO VCV check ". If they check ok, then your REF is ok. Otherwise check REF, and check if you have output of both PLL's Q2040 and Q2044 pin9. -- Greetings

I recently picked up a non-working 847 to replace the display on mine. The numbers on my 847 were losing some of the segments but the inoperable 847 had a good display. It was an easy swap and now my

Will do this saturday, I'll let you know. Thanks

-- Greetings from Erik Rothuis (PA2ER), Terborg Netherlands.

Put the transmitter in SSB. Mic gain 12 o clock position. Inject a 1KHz tone at 3mv level to the MIC jack (pin 8 = mic input, pin 7 = ground) Use a old amplified computer speaker, to trace the 1KHz

Thank you. I also notice that at the ssb there is no signal, of course im only using a osciloscope

The ic is a m5207L01 that is a stereo volume controller. PIN2 = output, PIN3 = control 0-5 volt, PIN4 = input. The datasheet can be found here

These chips were are current mirrors, you will not see the mic signal around here, look upstream towards the modulator and SSB filter. 73 Andrew ?Get BlueMail for Android ?

This is the preamp area, the left top ic manages audio input into hf,vhf,and uhf. Part is not clearly readable, but I think is Q1063 or Q1053. Yellow line is the traced path from 1Khz audio input

HI8RMQ if you want us to point you at the possible fault. You have to gif answers to our questions consistently. And gif answers to what you are asked. -- Greetings from Erik Rothuis (PA2ER), Terborg

Please just make a video and post it as private on YouTube. Folks can then see exactly what’s going on and broach a comment. De Spence G5STO Sent while portable! please excuse typos.

Great, if power output is ok on FM and CW then your PA is working. Do you have the same low SSB on VHF? Where were you feeding audio in to the rear? Which port on the back? Finally, what test

Very low audio, so SSB on HF is at much 3W. Powers on other modes all fine, AM, FM, CW, but theres no audio noticeable on FM or AM. Just happens on HF.

Further up the discussion he stated 100 watts FM on HF, so PA is fine. Perhaps the OP could clarify if any power on AM, CW and FM on HF, just so we are not getting

So no power in HF in FM mode? Then the fault is in the HF PA section, Q3002, or the preceding BPF. -- Greetings from Erik Rothuis (PA2ER), Terborg Netherlands.

Correct. The modulation in HF is very very low, talking very loud may give 3 or 4 w

Correct me please if i am wrong. The TS says that there is no modulation in phone and in digital mode, on HF? There is modulation on 2 meter, and 70 centimeter, in all modulation modes, digital and