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TC Electronic A/S
Finalizer Service manual
page 12
Circuit Description:
The Finalizer consist of a front, a digital, an analog and a power supply section. Here is a brief description of the sections:
Front section
consist of three boards and a display, all placed in the front profile.
The big board has two matrix circuits; one for LED's and one for keys. The
EEPROM with serial no. information for the unit is also located here.
The small boards are for LED's and key switches.
Digital section
is placed mainly in the middle and in the left side of the main board.
This section contains the Reset, MPU, SRAM, DSP, Dual Port RAM, DARC, Sound
RAM, Digital I/O, PLL, FLASH and Interfaces.
Reset controls the MPU, Digital receiver chip and the DA.
The Software for MPU is placed in FLASH. The MPU controls DSP, SRAM, Jeida,
Front, MIDI, Pedal in and analog gain settings.
The major task for DSP is to "calculate" sound. It also generates the 80MHz clock for
the DARC chip.
The DARC chip controls sound data to and from; DSP, Sound RAM, digital
in/outputs and AD/DA converters.
The PLL circuit makes a very stable frequency at 256 x sample rate , this frequency is
divided down to 64 x sample rate and to 1 x sample rate by the DARC. The PLL has its
own power regulation.
Interface for MIDI and Pedal In consist almost of discrete components.
Interface for Jeida is simplified by using a PAL.
The interface for the front has an integrator, which converts a 3.3kHz square wave to a
negative DC voltage for the display contrast. By changing the duty cycle of the square
wave the DC voltage and thereby contrast will also change. An attenuator allows the
MPU to measure the contrast voltage.
Analog section
is placed mainly on the right side of the main board.
The analog input is balanced, thus pin 3 should be connected to pin 1 when used with
unbalanced equipment.
Input levels are controlled by digital potentiometers. These potentiometers are contained
in a single chip, which controls the two analog input levels and the two analog output
levels.
The A/D converter is a 20bit converter and it is split into two chips. It has some external
filter capacitors, which are very sensitive. The A/D and D/A converter have also their
own power regulation.
The D/A converter is also 20bit. Be aware that the left & right signal output at the
converter contain an applied DC voltage.
After the D/A comes a 2nd. order filter, then the output level and then a 1st. order filter.
An electronic balanced circuit perform the output stage. Again XLR pin 3 should be
connected to pin 1 when used with unbalanced equipment.
Power supply section
consist of a separate Module and some regulation circuits on the
main board.
This service manual does not contain schematics for the Power Supply Module, because
any attempt to repair the power supply module must be completed with some safety tests
such as high voltage and EMC test. Hence it is strongly recommended that the entire
Power Supply Module is replaced in case of malfunction.
One regulation circuit has electronic switch for the +/-15V. The electronic switch for the
+5V is in the Power Supply Module. The switches are controlled by the Stand By circuit.
The Stand By circuit has it’s own separate power wire from the Power Supply Module.
