Issues to watch out for with TC 2290

Question

Are there any particular issues I need to watch out for with the TC 2290?

Answer

There are a few, yes:

1. Heavy noise/distortion on the DELAY-signal path:

Detected with DIR-VOLUME = 0. Check to see whether SPEC.#7 is set correctly - i.e. to the amount of memory installed in your 2290.

2. The DELAY-signal seems to lack treble whereas the DIR-signal is OK:

You are probably using a stereo-jack in the jack-input of the 2290. Always use mono-jack at this place.

3. The external effects are released during preset-shift:

SPEC.#18 (Manual ext. eff. control) is probably set to 1. This means that the effects are released during preset-shift. This 'error' may occur if you have had connected a SRC 0144 controller to the 2290 and you have chosen the function 'release ext. eff on TC 0144.

Even after a power down the 2290 will remember this function. When SPEC.#18 is set to 0 the effects are in state 'not released' again.

4. Common errors when using the DTSA-proms (27V08/28V08/29V08/30V08):

When using the DTSA-proms it is likely to get confused about how things are, concerning the setting of SPEC. no's. Let's take a look at the most 'mistaken' SPEC. no's.:SPEC#7 (Memory size):

Always enter the actual amount of memory installed in the 2290 in this SPEC. no. Do not take into considerations that the PROM mounted is a DTSA-PROM. This means that e.g. if you have only mounted a memory option MEO4 then enter the value 4 in SPEC#7. If you have mounted MEO4 and a ME11 PC-board then enter 11 in SPEC#7. 

Having mounted a MEO4 option and a MEOO option, the value which you have to enter into SPEC#7 is 4 (for the MEO4 option) plus 4 for each row of 1M DRAM IC's mounted on the MEOO-board (one row of 1M DRAM is 4 IC's).  

Confused? Here is an example:

A MEO4 is mounted-this gives 4 sec. A MEOO-board with four rows of IC's (16 pcs. of 1 M DRAM) is mounted-this gives 4*4=16 sec. What you have to enter into SPEC#7 is then 4+16=20.

SPEC#38 (Max. Dlytime):

The value entered into this SPEC. no. tells the 2290 how much of the total memory (SPEC#7 !!) that has to be reserved for DELAY- purpose.

SPEC#39 (Max. Sample Time):

The value entered into this SPEC. no. tells the 2290 how much of the total memory that has to be reserved for SAMPLE-purpose.

SPEC#38-39:

If for instance you only need, say 1 sec. for DELAY then enter 1.0   in SPEC#38. Now if you enter 0 in SPEC#39 , switch the 2290 off and on then the 2290 automatically calculates the amount of memory for SAMPLING (SAMPLING TIME = TOTAL MEMORY - DELAY TIME).

Entering 0 in either SPEC#38 or SPEC#39 always calculates the amount of memory left for the chosen SPEC. no.!

SPEC#36 (Double sampling time):

0 in this SPEC. no. gives normal sampling time whereas a 1 enables the double sampling time. Note that this SPEC. no. must be stored in the presets to make effect (preset-depended SPEC. no.).

SPEC#109 (Double sample time display):

Entering a 1 in this SPEC. no. when choosing the 'Double sampling time' function (SPEC#36=1) the display will work 'real-time' i.e. showing the actual elapsed time. A 0 (zero) would on the other hand cause the display to show half the elapsed time (still in 'Double sample time' mode) 

If the 'Double sample time' function is NOT chosen (SPEC#36=0) and SPEC#109=1 then note that the display will show the double of the actual elapsed time.

Note that SPEC#109 is global.

This means that changing from one preset to another does not affect the setting of SPEC#109.

Take care when working with SPEC#36 and SPEC#109:

An example:

You have been working in a preset where SPEC#36 is set to 1 (and SPEC#109=1). Now you change to another preset where SPEC#36=0 (SPEC#109 is still set to 1). The display will now show the double of the actual time.

To avoid this chose either to go on in 'Double sample time'-mode by setting SPEC#36 to 1 or if you want to work in normal mode set SPEC#109=0.


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