Multidyne Electronics CG-200 Series Instruction Manual Download Page 6

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Instruction Manual, CG-200

CIRCUIT DESCRIPTION

CLEAR ALL:

CAUTION!!!!

– This function clears the 16 message pages in memory and sets all selected

functions to default. All programmed messages and setting will be lost.

NOTE!

CLEAR ALL must be performed after the

battery

(B1) or the RAM(U4) are replaced.

TONE OPTIONS>

CANCEL

Exit without change.

TONE

SWEEP:

The unit will automatically sweep through the following frequencies: 125Hz, 250Hz, 400Hz, 1KHz, 2KHz,
4KHz, 8KHz, 10KHz, 12.5KHz, 16KHz and 20KHz. If you wish to maintain a single frequency, press the

SPACE

key during the tone you wish to maintain. Press the

SPACE

key again to continue sweeping. To

exit

TONE SWEEP

, repeat the menu selection.

TONE AMPLITUDE:

While in sweep mode, the

and

DWN

keys will scroll through the following amplitude settings, 0dB, +4dB

and +8dB.

CIRCUIT DESCRIPTION

The

CG-200 CPU KERNELL SCHEMATIC

shows the CPU (U1), the program ROM (U2), the program latch

(U3) and the battery backed RAM (U6). U10 is the watch dog timer as well as the switch to battery backup at power
down, U4 and U5 provide a precise delay to the black character mask so that the white characters are centered on
top of the mask and U9 is the actual character generator.

The

CG-200 ANALOG INTERFACE

schematic shows the I/O connector (J2), the bypass relay (K1), which

will bypass to program video when power fails or from the BYP switch (S8). U11 is the SYNC separator and U16 is
the video and character mixer.

CALIBRATION

For all calibration procedures, the CG-200 requires a card extender, which may be purchased from

MULTIDYNE. There are only four simply adjustment that can be made:

R7

Horizontal

character

position, set to center text on screen.

R17 - Video Gain, set for 100 IRE.

R38 - Character Gain, set for 70 IRE.

R13 - Audio Gain, set counter-clockwise to maximum.