Chapter 4 Performance Verification; Initial Inspection And Checkout; 960L Mainframe; Larc2 Controller - Lexicon 960L Service Manual

Chapter 4 Perfo r mance Verification
This section describes the tests and procedures for verification of the operation of the 960L with LARC2
and the integrity of its analog and digital audio signal paths.

Initial Inspection and checkout:

Note: Please refer to the chassis assembly drawing in the Schematics and Drawings section later in this
manual.

960L Mainframe:

1. Remove the top and bottom covers of the 960L
2. Inspect the entire unit for obvious signs of physical damage.
3. Unscrew the front panel screws and fold down the front panel.
4. Verify that the main processor board, midi card, and reverb cards are seated properly and are held
down with screws. Also verify that all cable connections to the midi card, main processor board, and
backplanes are in place.
5. At the back of the unit, in the power supply section, verify that all connections are firmly seated to the
backplane. Verify all ribbon cables are firmly seated to the I/O backplane and that Pin 1 of all ribbon
cables (identified by a red stripe) are at the top of the connectors.
6. Carefully turn the unit over.
7. Verify that all of the drives are properly secured in place. Verify all ribbon cables and power cables to
these devices are firmly seated.
8. Verify all ribbon cables to both the NLX and I/O backplanes are firmly seated.
9. On the back panel of the 960L make sure all cards are tightly screwed in place. Inspect all connectors
for wear or breaks that might cause intermittent operation.

LARC2 controller:

1. Inspect the entire unit for obvious signs of physical damage such as cracked or broken plastic
housings.
2. Verify display is not cracked or shattered.
3. Verify all sliders move up and down smoothly and do not bind.
4. Verify the joystick also has a smooth, fluid movement.
5. Depress all the buttons to insure non-stick operation.

Cables:

Inspect both the 960L power cable and LARC cable for physical damage or excessive wear.

Power Supplies:

Note: It is important that the power supply be tested while fully connected in the 960L mainframe
to insure proper voltage readings.
System Current Draw Tests:
1. For 100/120V operation, verify that the voltage selection switch* on the back of the 960L is set to the
115 Volt setting.
2. Set the voltage level on the Variable AC power supply down to 0 volts then turn it ON.
3. Plug the 960L into the variable AC power supply and switch the main power switch on the rear panel to
the ON position.
4. Slowly bring the variable AC power supply voltage up to 120 Volts. The current draw will vary from
between approximately 0.5A and 1.5A.
5. At 120V verify that the current draw is approximately 0.75 A and that the Green Power On LED above
the Front Panel power switch is on.
6. Power off.
Lexicon
4-1