Service manual

Wells-Garnder Color Vector Monitor Guide
Page 40 of 73
Figure 6 - IN754A and 1N756A Zener-Diode Connections
Solder Here
|
CATHODE +-+------+ \|/ +------+-+ CATHODE
--------+ |1N75#A+---------+1N75#A| +--------
+-+------+ ANODES +------+-+
----|<---- ---->|----
6. Connect two type-1N756A Zener diodes together and solder as described in step 5.
7. Examine the soldered side of the Deflection PCB removed from the display and
determine which of the two PCBs matches your PCB. [either a P314 or a P327/339]
8. On the component side of the Deflection PCB, locate the yellow wire (top right side of
the PCB).
9. Solder one cathode lead of the two type-1N754A Zener diodes (soldered together in step
5) to the yellow lead on the soldered side of the PCB as shown in the appropriate
illustration in Figure 7.
10. Solder the other cathode lead of the two type-1N754A Zener diodes to ground as shown
on the appropriate illustration in Figure 7.
11. On the component side of the Deflection PCB, locate the orange wire (near top center of
the PCB).
12. Solder one cathode lead of the two type-1N756A Zener diodes (soldered together in step
6) to the orange lead on the soldered side of the PCB as shown on the appropriate
illustration in Figure 7.
13. Solder the other cathode lead of the two type-1N756A Zener diodes to ground as shown
on the appropriate illustration in Figure 7.
14. On the component side of the Deflection PCB, locate connector P600 (right center of the
PCB).
15. Solder the cathode lead of a type-1N4002 diode to pin 1 and the anode lead to pin 4 of
connector P600 on the soldered side of the PCB as shown on the appropriate illustration
in Figure 7.
16. Solder the cathode lead of a type-1N4002 diode to pin 5 and the anode lead to pin 7 of
connector P600 on the soldered side of the PCB as shown on the appropriate illustration
in Figure 7.
17. On the component side of the Deflection PCB, locate connector P700 (left center of the
PCB).
18. Solder the cathode lead of a type-1N4002 diode to pin 1 and the anode lead to pin 4 of
connector P700 on the soldered side of the PCB as shown on the appropriate illustration
in Figure 7.
19. Solder the cathode lead of a type-1N4002 diode to pin 5 and the anode lead to pin 7 of
connector P700 on the soldered side of the PCB as shown on the appropriate illustration
in Figure 7.
20. Refer to Table 3 to determine which of the four versions of the display has been installed
in your Tempest game.