Difference between revisions of "Terminator 2: Judgement Day"
m (→Diode "Tie Back" missing causes Driver Board transistor Q20 to fail: Transposed words) |
(→Diode "Tie Back" missing causes Driver Board transistor Q20 to fail: Duplicated tie-back diode info from STTNG) |
||
| Line 21: | Line 21: | ||
Without this "diode tieback", Q20 on the driver board WILL be damaged and the associated coil is likely to become locked on and melt. The diode tie-back wire is violet/orange and connects from the coil power side on the drop target assembly coil lug to J122 pin 9 on the driver board. If the solder connection at the coil lug is solid, suspect the wire connection at the J122 IDC connector. Repinning this connection with a good quality crimp-on Trifurcon pin is advised. | Without this "diode tieback", Q20 on the driver board WILL be damaged and the associated coil is likely to become locked on and melt. The diode tie-back wire is violet/orange and connects from the coil power side on the drop target assembly coil lug to J122 pin 9 on the driver board. If the solder connection at the coil lug is solid, suspect the wire connection at the J122 IDC connector. Repinning this connection with a good quality crimp-on Trifurcon pin is advised. | ||
<br clear=all> | <br clear=all> | ||
| + | |||
| + | [[Image:T2IllustratedTiebackDiode.jpg|200px|thumb|left|<i>Illustration provided with permission of Sascha Voskuil aka Zaza.</i>]]<br> | ||
| + | Another very reliable way to ensure that the diode tieback never loses connectivity, is to connect an additional wire, as pictured at left. Jumper a wire (preferably purple/orange) from Power/Driver board J122 pin 9 to Power/Driver board J107 pin 2. The original purple/orange wire can be extracted from the wire bundle and used for this purpose or you can simply leave it connected as it originally was as "insurance". The end result is functionally and electrically identical, but has the advantage of moving the diode tieback connection away from the high vibration/shock environment at the single drop target coil. | ||
| + | <br clear=all> | ||
| + | |||
| + | Yet another solution is to add a clamping diode onto the single drop target knock down coil, in the same way that Williams System 11/11A and earlier platforms where diodes are used. The 11B/C and WPC systems moved all coil diodes (except flippers) onto the aux. power driver board and power/driver board respectively. This eliminated any possibility of wiring a coil "backwards". Attaching diodes to coils can still be done, but the proper polarity of the connections is very important. The non-banded side of the diode connects to the path to ground (usually a skinny wire). The banded side of the diode connects to the power source (usually a fatter wire, not that there is anything wrong with being a little fat...all wires matter...). Caution is warranted as connecting the diode backwards will blow the diode and the drive transistor immediately. | ||
Return to [[Williams WPC]] page. | Return to [[Williams WPC]] page. | ||
Revision as of 18:51, 30 March 2016
| Manufacturer | System | Year | Model | Produced |
|---|---|---|---|---|
| Williams | WPC-Dot Matrix | 1991 | 50013 | 15,202 |
Terminator 2: Judgement Day Playing Tips and Rule Sheet
Terminator 2: Judgement Day Shop Guide
1 Game-Specific Issues
1.1 Diode "Tie Back" missing causes Driver Board transistor Q20 to fail
Similar to the common problem that Star Trek: The Next Generation owners encounter, Terminator 2 can lose the "diode tieback" connection, causing Q20 to fail, as pictured on the right.
Without this "diode tieback", Q20 on the driver board WILL be damaged and the associated coil is likely to become locked on and melt. The diode tie-back wire is violet/orange and connects from the coil power side on the drop target assembly coil lug to J122 pin 9 on the driver board. If the solder connection at the coil lug is solid, suspect the wire connection at the J122 IDC connector. Repinning this connection with a good quality crimp-on Trifurcon pin is advised.
Another very reliable way to ensure that the diode tieback never loses connectivity, is to connect an additional wire, as pictured at left. Jumper a wire (preferably purple/orange) from Power/Driver board J122 pin 9 to Power/Driver board J107 pin 2. The original purple/orange wire can be extracted from the wire bundle and used for this purpose or you can simply leave it connected as it originally was as "insurance". The end result is functionally and electrically identical, but has the advantage of moving the diode tieback connection away from the high vibration/shock environment at the single drop target coil.
Yet another solution is to add a clamping diode onto the single drop target knock down coil, in the same way that Williams System 11/11A and earlier platforms where diodes are used. The 11B/C and WPC systems moved all coil diodes (except flippers) onto the aux. power driver board and power/driver board respectively. This eliminated any possibility of wiring a coil "backwards". Attaching diodes to coils can still be done, but the proper polarity of the connections is very important. The non-banded side of the diode connects to the path to ground (usually a skinny wire). The banded side of the diode connects to the power source (usually a fatter wire, not that there is anything wrong with being a little fat...all wires matter...). Caution is warranted as connecting the diode backwards will blow the diode and the drive transistor immediately.
Return to Williams WPC page.