CRT SS 7900 Service Mode

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fixitdaz
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Call Sign: 26FB1104

Re: CRT SS 7900 Service Mode

Post by fixitdaz » 14 Sep 2017, 09:31

Do we have any more info on what,
4 FRQ
5 FRQ0F
6 BFO
7 AFR
8 CTSS
9 DCS
10 SUL36
11 SUL01
12 SFA36
13 SFR01
14 ASQ
15 RsiTx
stand for and is there any service info on the crt ss7900,Thanks

simonthewizard
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Re: CRT SS 7900 Service Mode

Post by simonthewizard » 15 Sep 2017, 07:32

4 Frequency
5 Frequency Offset
6 Beat frequency Oscilator
7
8 & 9 It’s the adjustment of CTCSS board
10
11
12
13 Signal Frequency Recieve
14 Auto Squelch
15 This is the signal meter adjustment. (Also adjustable in programming software) Dealer

Every single radio has a different amount in the menu as all radios made different and not identical. Play here at your peril

Simon

fixitdaz
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Re: CRT SS 7900 Service Mode

Post by fixitdaz » 15 Sep 2017, 17:02

Thanks for the info Simon, do we know if there is a service manual for this radio when I got this radio it wasn't working correctly all the service menu had been altered and in am mode it would kill my power supply I turned am mod and this stopped it from tripping the power supply but there is still a problem in am mode as it transmits this is an eBay buy that I would like to get it going, I have put all service settings back to standard everything working except am mode and do we know what op3 is on underside of PCB same as op1 and op2 looks like you can link it for a third option, any info on a schematic or service manual would be greatly appreciated
Darren aka: fixitdaz

fixitdaz
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Re: CRT SS 7900 Service Mode

Post by fixitdaz » 11 Oct 2017, 18:56

My mistake its OP5 and it looks to be linked by a trace
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ROTEL240
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Re: CRT SS 7900 Service Mode

Post by ROTEL240 » 06 Nov 2017, 16:06

Anybody any wiser on how to use the service menu, i have a crt ss 9900 which seem slightly off frequency and was wondering if a slight ajustment would put the radio back on frequencyits the same menu as above ,ie to be spot on 27.3850 i have to be on 27.3851..not a big deal as i am using clarifier in tx rx mode (unlocked).Thanks fo reading....

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listner132
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Re: CRT SS 7900 Service Mode

Post by listner132 » 19 Sep 2018, 20:22

Old threat i know but just wondering if anyone has found out anymore about this service menu ?

thanks.

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