Bottlehead Forum

Bottlehead Kits => Eros Tape => Topic started by: mkontor on August 18, 2013, 07:14:41 AM

Title: test values
Post by: mkontor on August 18, 2013, 07:14:41 AM

I have not fired it up yet because I get different resistance values for T12, T14, T29 and T30 - my meter goes to a maximum of 2000K and on these terminals is goes over this value - it starts at 1179 then climbs and reads nothing, on all for tags.

Also T9 adn T10 are both supposed to be 39K; I get 47K for T9, T10 is correct.

This s all with switch set to NAB

Any ideas before I power it up?

BTW I get 200k instead of 130K as well as the other member for T4, T16, T17

Title: Re: test values
Post by: Paul Birkeland on August 18, 2013, 07:21:28 AM

Since these aren't zero, I'd go ahead and move onto the voltage checks.  Different meters will behave differently with capacitors involved in the resistance measurements. 

Title: Re: test values
Post by: mkontor on August 18, 2013, 07:38:56 AM

Not good advice, but thanks!
PROBLEM SOLVED - I mounted the resistor that goes from T11 to T12 one over to the left. This is because later on in the instructions the T numbers are wrong for this resistor, but the picture is correct...

Title: Re: test values
Post by: mkontor on August 18, 2013, 07:40:25 AM

However, I still get 47K for T9 and T10...not worried about this

Title: Re: test values
Post by: mkontor on August 18, 2013, 08:01:08 AM

All the voltages except on are spot on - but on one board the breg and OB are 150V instead of 100V...
Any ideas?

Title: Re: test values
Post by: Paul Birkeland on August 18, 2013, 08:15:49 AM

If the 200K resistor on that side was not properly attached, the OB voltage would creep up a bit.

Title: Re: test values
Post by: mkontor on August 18, 2013, 08:28:14 AM

there is no 200K resistor on those boards - do you mean the 300K one?
The resistors measure equally on both boards...

Title: Re: test values
Post by: Paul Birkeland on August 18, 2013, 09:07:16 AM

The 200K resistors do not reside on the boards.

It's a common misconception that the performance of the components on the PC boards are completely independent from the rest of the circuit, but this is quite misleading.

-PB

Title: Re: test values
Post by: mkontor on August 18, 2013, 04:40:51 PM

that resistor is correctly installed form T4 to T5; else the resistance values woudl be incorrect - this was the problem with the 200K resistor installed at T12 and R12

Title: Re: test values
Post by: mkontor on August 18, 2013, 10:57:11 PM

I swapped the boards over and the fault  is definitely on the board.
Anyone have any ideas?

Title: Re: test values
Post by: mkontor on August 18, 2013, 11:35:19 PM

ALL FIXED = had the little silver transistor round the wrong way...