Service manual

10
GPIB Board
This assembly contains static sensitive components. Observe all standard electrostatic procedures when
removing or replacing the GPIB board (see Chapter 3).
• Remove the modules from the two slots closest to the GPIB board.
• Remove the left side cover from the unit.
• Disconnect the keypad/display cable from J203/J202. the power cable from J209, the transformer cable from
J206/J207, and the fan cable from J205.
• Remove the Hex standoffs on the GPIB connector on the rear panel.
• Remove the screw that secures the ground wire to the chassis.
• Remove all the screws that secure the shield to the GPIB board and the fan shroud.
• Remove the shield.
• Turn the ends of the two plastic GPIB board standoffs 1/4 turn to loosen them and remove the GPIB board.
Note: On the 6051A you must also remove the screw that secures the switch bracket on the GPIB board to the
chassis.
• When reinstalling the GPIB board, lift up the safety interlock bracket on the side panel so that the switch on the GPIB
board is correctly positioned under the bracket when the board is installed.
Keypad
• Remove the front panel (see Front Panel).
• Remove the nuts securing the keypad to the front panel and remove the keypad pc board.
• The keypad and keypad spacer come out when the pc board is removed.
Remove the cable from the keypad only if replacing the keypad or cable. The cable connector located on
the back of the keypad is not designed for routine disconnection. If the cable must be disconnected
carefully pull the connector straight out. To avoid breaking the pins DO NOT rock the connector back
and forth.
• When reinstalling the cable, be sure to line up the cable stripe over the hole marked with a square. Also, make sure the
pins are all properly aligned before reinstalling the connector.
• When reinstalling the keypad, remember to install the spacer between the keypad and the front panel.
LCD Display and Window
• Remove the front panel (see Front Panel).
• Remove the two nuts securing the LCD display to the front panel and remove the LCD display.
• The display window comes out when the display is removed.
Remove the cable from the display only if replacing the display or cable. The cable connector located on
the back of the display is not designed for routine disconnection. If the cable must be disconnected
carefully pull the connector straight out. To avoid breaking the pins DO NOT rock the connector back
and forth.