Led Test (10); Lexichip3 External Dram Test (11) - Lexicon MPX 110 Service Manual

24 bit dual channel processor

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MPX 110 Service Manual

mode or from the PC's command line.

LED TEST (10)

This test will verify all LED's (8) are working. When selected, the Binary LED's will read the following:

Edit

Bypass

MSB

Pressing the STORE button will execute the test.

When the test is executed, the Front Panel LED's that are assigned to the current position of the

PROGRAM Encoder will be lit. (See below)

Plate, Gate

Hall, Chamber

Ambience, Room

Tremelo, Rotary

Chorus, Flange

Pitch, Detune

Delay, Echo

Special FX

User

Flange - Delay

Pitch - Delay

Chorus - Delay

Delay - Reverb

Flange - Reverb

Pitch - Reverb

Chorus - Reverb

The STORE button will be active to exit the test. The PROGRAM Encoder will be active to test the LED's.

Referring to Table 2, each LED is assigned to a position on the PROGRAM Encoder. When a position is

selected, its assigned LED will light. There's also a position where all the LED's will light and a position

where all LED's are off.

When the test is executed the VARIATION Encoder, BYPASS, TAP, ADC Pots and footswitches (2) are

inactive.

LEXICHIP3 EXTERNAL DRAM TEST (11)

The DRAM test is a modified checksum test executed by the Lexichip3, and is designed to exercise all 24

of the DRAM data bits. During the test, a unique value is written into each memory location, a modified

checksum which alternately adds or subtracts successive values is then calculated and stored in the

Lexichip3's ADF. The checksum calculated from all the DRAM memory locations is then compared with the

checksum stored in the Lexichip3's ADF. The test passes if the DRAM checksum equals what is stored in

the Lexichip3's ADF. The DRAM test takes approximately 12 seconds to complete.

Note: Interrupts are disabled during the test which effect the normal operation of the Front Panel LED's.

The Front Panel LED's will return to normal operation when the test is completed and the pass/fail result is

displayed.

When selected, the Binary LED's will read the following:

5-14

Store

Tap

LSB

PROGRAM Encoder

Position

LED Assignment

All LED's On

Left Clip On

Right Clip On

Left Level On

Right Level On

Edit On

Bypass On

Store On

Tap On

All LED's Off

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Led Test (10); Lexichip3 External Dram Test (11) - Lexicon MPX 110 Service Manual

LED TEST (10)

LEXICHIP3 EXTERNAL DRAM TEST (11)

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