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Reporting back .. Removed both covers and traced the RX signal line via the ATT switch to Trimmer Board A. I measured continuity between *'RX Antenna In' -> Switch -> choke* and it was fine. The

Well, when you open it and look for yourself, the display unit is kind of in the way so for me it was A LOT easier to remove both the display unit and the four screws holding the VFO, then slide the

As per subject line ... Thank you

Yes, I was thinking about exactly this. I'll have to wait for the Contact Cleaner to arrive, once it's here I'll open the radio and will inspect the switch.

Before going too far, try jumpering the attenuator switch. That should localise the problem. George, G8AOJ -- George Smith - RSGB, D

One thing you could try is to gently work the ATT switch back and forth like 50 times. That often works for a little time. Sent from Gmail Mobile Chuck Chandler chandlerusm@...

The signal from the antenna connector followed the Red marks through the att switch and to the front end of the receiver. The marker is the Green mark which is injected after the att switch. With the

I had a look at the trimmer board A and I think the adjustable 'transformer' is *T1* and not the trap coil (??). There is also a 270pF capacitor which I think is *C21* from the secondary side of the

Thank you for the effort Chuck, The 'Trap' is located on the Trimmer Board 'A' From my observation the Marker Signal does not go through the ATT switch but must be fed (as Don suggested) somewhere

Well, let me try... Green line shows marker signal flow, from the block diagram it is injected outside of the RF Unit board but before Q101. [image: image.png] The marker circuit is circled in red,

OUT. As far as I know, cooling fans always draw fresh air in from somewhere and push it out at the fan side.

The marker output is sent out from the AF board on J04 pin 2 which goes through trimmer A unit and on through T1 and on to the RF board. 73 Don ve3ids

Hello Chuck, Following your post I went through the schematics and could retrace the RX signal flow (on paper). So I now got a better understanding of the RX signal path. Before I treat the switch

Hi all, A question about the FT-101ZD Cooling Fan. Does it pushes the air in or out ?? 73, Jacques, VE2JFE in Montreal

Hi Andrew, That's good, it means that the problem is likely the attenuator switch like another op suggested. The relay and the lamp must be ok. I would try cleaning the attenuator switch like the

Hi Don, Thank you ... The problem arises on both inputs, same thing! I also checked continuity between the two jacks and it was around 8 Ohm. I used the 'Marker' switch too, dialed in the frequency

I’ve had 2 out of the last four 101ZD radios... have similar issues after sitting around unused for too long. Get some decent switch cleaning spray like Deoxit D5. Turn the radio face up and on

The service manual is in the files area of this group. I'll send you a copy of mine directly. GL, 73 de Chuck, WS1L chandlerusm@...

You can do some easy initial checks without taking anything apart. Hook your receive antenna to the rcv ant jack and see if you get normal receive. If you do, check continuity, with power off, between

Thanks Chuck, I need to get oriented with the schematics and the overall layout / functionality of the rig. It's quite a bit of components in there ... It shouldn't be too difficult to trace the RF