Maintenance
1705A Spectrum Monitor 6-25
2. Remove the plugs fromthe following connectors: J1 to the Front-Panel
board, J4 on the Power Supply board, andJ2 on the Main board (Trace
Rotation).
3. Unsolder the leadsthat go to the rear-panel bnc connector and ground the
two horizontal crt leads (red and green) and the two vertical crt lead s (blue
and brown).
4. Slip the crt and tracerotation leads through the appropriate holes in the Main
board.
5. Remove the seven screws that are holding the board in p lace. SeeFigure
6-11for their locations.
6. Remove the Main boardby sliding it toward the rear panel until the toe of
the board clearsthe front. Then lift out.
7. Torep lace the Main board, lay the board flat and slide it back into place.
Guide the frontof the circuit board into the slots in the front molding.
8. Toco mplete the replacement of the board, reverse the res t of the steps.
1. Remove the plug fromA1J4 on the Power Supply board (the connection to
the Main board).
WARNING.The crt may retain a dangerous charge. Groundthe conductor of the
anode to dischargethe crt. Do not allow the conductor to touch your body or
any circuitry.
2. Remove the anodeconnection from the crt and discharge it to ground.
3. Remove the plugs fromJ1 and J3 (the crt wires). Remove the plug fromJ2
(the power switch). (Ifthe 1700F10 Field Upgrade Kit is installed, unsolder
the leads to the rear-panel DC Connector.)
4. Disconnect the acline filter from the rear panel by unscrewing the two
screws on therear panel that are holding it in.
5. Using a #1 Pozidriveวบtip, disconnectthe power ON/OFF switch from the
front panel.
6. Remove the sevenscrews that fasten the Power Supply board to the
instrument, as shown in Figure 6-12.
7. Remove the boardby sliding it forward and lifting it up.
Removal andReplacement of the PowerSupplyB oard
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