Grass Valley 1200 Installation - Manual (Page 124)

4-10
Section 4 Ñ Maintenance
To remove a circuit board assembly from the Control Panel, proceed as
follows:
1. Turn off the AC power at the switch located on the power supply
enclosure inside the Control Panel.
2. Unplug the AC line cord from the AC source or the control panel. The
AC line cord is located at the rear of the Control Panel.
3. On the Model 1200 Control Panel remove any control knobs, that
would interfere with removal of the assembly.
NOTE: It is not necessary to remove the joystick/positioner nor the lever arm
T-handle to change circuit boards.
4. Open the Control Panel and locate the board to be replaced.
5. Disconnect any cables or wiring that may be attached to the board
being removed.
CAUTION
Use care when removing cables or wiring to prevent the bending of connector pins
or damage to cable assemblies. Damage of this type can result in improper
operation or further damage to other circuit modules.
CAUTION
Use caution when handling or removing circuit boards. Due to their size and weight
and because of their multi-layer and surface-mount construction they may be
damaged by improper handling. When removed from their mounting, circuit boards
should be placed on a flat, non-conductive, and non-static surface.
6. While supporting the board, remove all retaining screws and carefully
lift the board out of the Control Panel.
7. To replace or reinstall a circuit module, reverse the steps of the
previous procedure.