Atec Tektronix-1502 - Manual (Page 61)

TM 9-4935-601-14-3&P
Figure 5-3. Rear View of The HV Board.
Logic Board
1. Remove the three pin connectors from the Logic board.
2. Remove the four screws holding it in the chassis.
3. CAREFULLY lift on the rear of the Logic board to pull the board off the ten feed-thru pins which are
mounted on the chassis. Lift the board off the chassis when clear of the pins.
4. Use care when replacing the board to prevent bending the pins or the pin connectors on the board.
Main Board and Vertical Amp/Slow Ramp Board
Removal of the main board and the Vertical Amp/Slow Ramp board requires removal of some front panel
controls. This will destroy the water-tight seals. Sealing instructions are included in this section. It is usually
preferable to have this done at a Tektronix Service Center.
Cathode-Ray Tube Replacement
To replace the crt, proceed as follows:
WARNING
Use care when handling a crt. Protective clothing and safety glasses should be worn. Avoid striking it on
any object which might cause it to crack or implode. When storing a crt, place it in a protective carton or set it
face down in a protected location on a smooth surface with a soft mat under the faceplate to protect it from
scratches.
1. Remove the Battery Pack from the 1502.
2. Remove the pin connectors from the top of the Output Amps board.
3. Remove the four screws holding the crt socket bracket to the frame.
4. Remove the screw bracing the rear of the crt socket to the chassis.
5. Slide the entire assembly (crt, socket bracket, and crt shield) to the rear about 1/4 inch. Lift straight up
on the entire assembly, clearing the tabs on the front panel casting.
6. Set the assembly on top of the 1502 with the socket wiring still attached.
7. Remove the gasket from the front of the crt.
8. Unplug the socket from the crt.
9. Carefully remove the crt from the shield, guiding the two-wire pin connector through the hole in the
shield as the crt comes out the front.
10. The Trace Rotation Yoke (L0234) can now be removed and installed on the new crt. Position of the
Yoke is not critical. Make sure it is tight against the neck of the crt and fastened with tape.
11. Install the crt using the above procedure in reverse. Use care when tightening the screw bracing the crt
from the rear of the chassis.
Tunnel Diode Replacement
Tunnel diode (CR1703) may be replaced using the following procedures:
1.
Remove the screws from the Main board shield and cavity shield.
If the front of the shield was soldered to the bnc connector, unsolder the connection between the CABLE
bnc connector and the cavity shield. Use a solder wick or other desoldering tool to remove all solder.
REV B FEB 1980
5-5