[2017-05-15 15:18:45 CEST] * heinz joined
[2017-05-15 15:34:04 CEST] * heinz quit (ping timeout)
[2017-05-17 13:27:18 CEST] * dasteph joined
[2017-05-17 13:27:45 CEST] <dasteph> hello room
[2017-05-17 13:34:04 CEST] * dasteph quit (EOT)
[2017-05-17 13:41:53 CEST] * dasteph joined
[2017-05-17 13:50:05 CEST] <dasteph> good bye room
[2017-05-17 13:50:23 CEST] * dasteph quit (EOT)
[2017-05-18 01:53:11 CEST] * fuzb quit (ping timeout)
[2017-05-18 01:54:44 CEST] * fuzb joined
[2017-05-18 05:27:16 CEST] * fuzb quit (ping timeout)
[2017-05-18 05:28:46 CEST] * fuzb joined
[2017-05-18 22:51:11 CEST] * Outsoft joined
[2017-05-18 23:38:44 CEST] * siggi joined
[2017-05-18 23:40:43 CEST] * siggi set topic to 'Zeddy for ever :-)'
[2017-05-18 23:42:04 CEST] * siggi quit (EOT)
[2017-05-19 00:43:35 CEST] * Outsoft quit (Leaving...)
[2017-05-19 21:32:42 CEST] * Outsoft joined
[2017-05-19 22:36:40 CEST] * Outsoft quit (Leaving...)
[2017-05-20 21:18:49 CEST] * Outsoft joined
[2017-05-20 22:21:51 CEST] <Outsoft> I've created a new Sinclair FB group, hope you enjoy it: https://www.facebook.com/groups/sinclairpreservation/
[2017-05-20 22:33:01 CEST] * Outsoft quit (Leaving...)
[2017-05-21 08:25:00 CEST] * dasteph joined
[2017-05-21 08:57:19 CEST] * dasteph quit (ping timeout)
[2017-05-21 09:44:28 CEST] * dasteph joined
[2017-05-21 10:13:00 CEST] <dasteph> hello
[2017-05-21 10:19:09 CEST] * dasteph quit (ping timeout)
[2017-05-21 20:00:48 CEST] * rune joined
[2017-05-21 20:03:16 CEST] * heinz joined
[2017-05-21 20:03:35 CEST] <rune> hello heinz
[2017-05-21 20:04:17 CEST] <heinz> hello dave
[2017-05-21 20:04:48 CEST] <rune> Hi, how are you tonight
[2017-05-21 20:05:00 CEST] <heinz> fine, and you?
[2017-05-21 20:05:26 CEST] <rune> good, the sun makes a big difference
[2017-05-21 20:05:34 CEST] <heinz> right.
[2017-05-21 20:05:46 CEST] <heinz> we had 31 degree celsius
[2017-05-21 20:05:57 CEST] <rune> I tried swapping the ZTX313 for a BC237B which was supposed ot be the same but no difference
[2017-05-21 20:06:08 CEST] <rune> We had 19
[2017-05-21 20:07:04 CEST] <rune> Are you using hexchat or zx81 tonight
[2017-05-21 20:07:06 CEST] <heinz> bc237b has the same wiring.
[2017-05-21 20:07:25 CEST] <heinz> i use the good old zx81.
[2017-05-21 20:07:28 CEST] <rune> Yes, but it doesnt seem to work
[2017-05-21 20:07:35 CEST] <heinz> no, zx81nu
[2017-05-21 20:07:45 CEST] <rune> I have ordered some ZTX313s
[2017-05-21 20:07:59 CEST] <heinz> can you read schemes?
[2017-05-21 20:08:10 CEST] <rune> Yes, but not well
[2017-05-21 20:08:34 CEST] <heinz> lets hhave a look to the scheme.
[2017-05-21 20:08:58 CEST] <rune> OK I will get it opened
[2017-05-21 20:10:16 CEST] <heinz> you dont have a clk at pin6 cpu.
[2017-05-21 20:10:21 CEST] <rune> Opened and I have a Isse 3 in front of me
[2017-05-21 20:10:22 CEST] <heinz> rightc
[2017-05-21 20:10:36 CEST] <heinz> right?
[2017-05-21 20:10:53 CEST] <rune> Can I ask, why 3 legs on oscillator
[2017-05-21 20:11:26 CEST] <heinz> i  think that only two of them are connected.
[2017-05-21 20:11:37 CEST] <rune> ok
[2017-05-21 20:11:48 CEST] <heinz> i think the x1 is a filter.
[2017-05-21 20:12:05 CEST] <rune> Also on the board C6 looks like a resistor
[2017-05-21 20:12:06 CEST] <heinz> only one half is used for osc.
[2017-05-21 20:12:27 CEST] <heinz> c6 is green, isnt it?
[2017-05-21 20:12:32 CEST] <rune> yes
[2017-05-21 20:12:43 CEST] <rune> 5 coloured bands
[2017-05-21 20:12:45 CEST] <heinz> green ones are capacities.
[2017-05-21 20:12:57 CEST] <rune> oh, never new that
[2017-05-21 20:13:24 CEST] <heinz> look to the www for capacities now.
[2017-05-21 20:13:32 CEST] <heinz> color code
[2017-05-21 20:14:45 CEST] <heinz> 1st color is  what?
[2017-05-21 20:15:06 CEST] <heinz> suppose brown
[2017-05-21 20:15:10 CEST] <rune> white or brown depending on whatway its read
[2017-05-21 20:15:20 CEST] <rune> ok brown 
[2017-05-21 20:15:22 CEST] <heinz> take brown
[2017-05-21 20:15:32 CEST] <heinz> next two are black?
[2017-05-21 20:15:43 CEST] <rune> then purle then brown
[2017-05-21 20:16:10 CEST] <rune> Maybe next one is black (instead of prple)
[2017-05-21 20:16:22 CEST] <rune> then brown gold white
[2017-05-21 20:16:45 CEST] <heinz> 1st + 2nd gives 1 and zero.
[2017-05-21 20:16:54 CEST] <rune> so brown black brown gold white
[2017-05-21 20:17:37 CEST] <heinz> 3rd is brown, has to be interpreted as multiplicator.
[2017-05-21 20:17:57 CEST] <heinz> tablee says: brown = 10
[2017-05-21 20:18:16 CEST] <rune> should be 100 pF?
[2017-05-21 20:18:25 CEST] <heinz> this results in 10x10=100 for the first 3 rrings.
[2017-05-21 20:18:52 CEST] <heinz> the final ttwo are tolerance
[2017-05-21 20:18:59 CEST] <heinz> not important.
[2017-05-21 20:19:16 CEST] <heinz> so we have 100pf as it should.
[2017-05-21 20:19:34 CEST] <rune> OK, it connects to P35 on ULA which is...
[2017-05-21 20:19:50 CEST] <heinz> did you check tr2 after desoldering?
[2017-05-21 20:19:59 CEST] <heinz> really faulty?
[2017-05-21 20:20:17 CEST] <rune> No, I dont know how to. I can get it and meter in 30 seconds
[2017-05-21 20:20:39 CEST] <heinz> yes. we sholud do it.
[2017-05-21 20:21:21 CEST] <heinz> switch the meter to diode tester mode.
[2017-05-21 20:21:21 CEST] <rune> sorry, nit there. Must have been thrown out
[2017-05-21 20:21:31 CEST] <heinz> o.k.
[2017-05-21 20:22:12 CEST] <rune> At the oscillator, left pin is a perfect sine wave. Right pin is meandering wave. But very low amplitude
[2017-05-21 20:22:36 CEST] <heinz> you should measure from the basis pin ( in thee middle) to thee both lcheck at pin 14 ula.
[2017-05-21 20:22:47 CEST] <heinz> sorryy.
[2017-05-21 20:22:57 CEST] <rune> At P14 on the ULA is the same meandering wave but much larger amplitude
[2017-05-21 20:23:15 CEST] <heinz> o.k.
[2017-05-21 20:23:28 CEST] <heinz> next at c7
[2017-05-21 20:23:36 CEST] <heinz> r6.
[2017-05-21 20:23:56 CEST] <heinz> this goes to the basis of tr2.
[2017-05-21 20:24:33 CEST] <heinz> next pin6 cpu.
[2017-05-21 20:24:53 CEST] <rune> I can see C7 on diagram but not on the board. Could it be marked C4 in error?
[2017-05-21 20:25:25 CEST] <heinz> i ddoont know. dont have a iss3 board here.
[2017-05-21 20:25:37 CEST] <heinz> check at pin6 cpu.
[2017-05-21 20:26:55 CEST] <rune> collector is connected to P6
[2017-05-21 20:27:04 CEST] <heinz> yes.
[2017-05-21 20:27:13 CEST] <heinz> what signal there?
[2017-05-21 20:28:29 CEST] <rune> I dont have the oscilloscope here. But the signal was about 5 volts
[2017-05-21 20:28:39 CEST] <heinz> dc?
[2017-05-21 20:28:49 CEST] <rune> no meandering wave like the working Iss 3
[2017-05-21 20:29:12 CEST] <heinz> did yyou already replace the tr2
[2017-05-21 20:29:14 CEST] <heinz> ?
[2017-05-21 20:29:25 CEST] <rune> Yes, no difference
[2017-05-21 20:29:34 CEST] <heinz> right wiring?
[2017-05-21 20:29:40 CEST] <heinz> ebcc
[2017-05-21 20:29:45 CEST] <heinz> ebc?
[2017-05-21 20:29:47 CEST] <rune> I thought so.
[2017-05-21 20:30:06 CEST] <heinz> what was the type  of this trans?
[2017-05-21 20:30:59 CEST] <heinz> tr2?
[2017-05-21 20:31:36 CEST] <rune> Ah, looking at the datasheet. It may be cbe
[2017-05-21 20:31:48 CEST] <rune> NPN
[2017-05-21 20:31:55 CEST] <heinz> what was the namec
[2017-05-21 20:32:00 CEST] <heinz> name?
[2017-05-21 20:32:09 CEST] <heinz> bt...?
[2017-05-21 20:32:21 CEST] <rune> I dont know, Should I go and get the packet
[2017-05-21 20:33:27 CEST] <heinz> usually it  it0s printed onto the casing of the transistor.
[2017-05-21 20:33:43 CEST] <heinz> go for the packet.
[2017-05-21 20:34:55 CEST] <rune> 2 secs
[2017-05-21 20:35:12 CEST] <rune> it says ctbc 238b
[2017-05-21 20:37:17 CEST] <heinz> bc238 has ebc..
[2017-05-21 20:37:41 CEST] <heinz> c is connected  with pin6 cpu.
[2017-05-21 20:37:42 CEST] <rune> I read the datasheet as cbe
[2017-05-21 20:38:09 CEST] <heinz> this is the same, just mirrored.
[2017-05-21 20:38:31 CEST] <heinz> e is connectted with ground.
[2017-05-21 20:38:46 CEST] <rune> Reading the TR, there is a flat side
[2017-05-21 20:38:59 CEST] <rune> flat side towards you
[2017-05-21 20:39:11 CEST] <rune> so its CBE?
[2017-05-21 20:39:24 CEST] <heinz> yes, the e is on the right side.
[2017-05-21 20:39:32 CEST] <heinz> cbe.
[2017-05-21 20:39:51 CEST] <rune> C is to ground?
[2017-05-21 20:39:55 CEST] <rune> E to pin 6
[2017-05-21 20:40:03 CEST] <heinz> no, e is gnd.
[2017-05-21 20:40:11 CEST] <heinz> c is pin6 cpu.
[2017-05-21 20:40:15 CEST] <rune> and B to C7
[2017-05-21 20:40:26 CEST] <heinz> yes.
[2017-05-21 20:40:46 CEST] <heinz> look for splattered solder.
[2017-05-21 20:40:53 CEST] <heinz> remove if so.
[2017-05-21 20:40:55 CEST] <rune> That would explain it I put it in the same way as original
[2017-05-21 20:43:21 CEST] <heinz> it seems so.
[2017-05-21 20:43:41 CEST] <heinz> but i cannot find the datasheet of zxt313.
[2017-05-21 20:43:49 CEST] <rune> Looking at the pcb, there is a small c where the emitter is.... Im an idiot and its obvious when you explained it.
[2017-05-21 20:43:52 CEST] <heinz> did yoou find it?
[2017-05-21 20:44:05 CEST] <heinz> ok.
[2017-05-21 20:44:17 CEST] <heinz> turn it 180 degree.
[2017-05-21 20:44:30 CEST] <rune> So I reverse the TR. Should I use a new one?
[2017-05-21 20:44:48 CEST] <heinz> not necessarry.
[2017-05-21 20:45:02 CEST] <rune> OK, I will do that this evening.
[2017-05-21 20:45:21 CEST] <heinz> but  you can take a new one, tthey are very cheap.
[2017-05-21 20:45:37 CEST] <heinz> lets stop for today.
[2017-05-21 20:45:51 CEST] <heinz> i will care about brigiitte.
[2017-05-21 20:45:58 CEST] <rune> OK, you have given a good clue. Thanks
[2017-05-21 20:46:10 CEST] <rune> Talk to you later, bye
[2017-05-21 20:46:11 CEST] <heinz> finee.
[2017-05-21 20:46:15 CEST] <heinz> bye
[2017-05-21 20:46:21 CEST] * rune quit (Leaving)
[2017-05-21 20:46:26 CEST] * heinz quit (EOT)