your guide to pinball in Belgium
Relays module
| Sympton | Cause | Procedure |
| A) None of the relays closed | A) Supply failure | Test with a voltimeter. The voltage at the connector between + and - has to be 10 VDC + 1,5V. |
| b) 10V line open | Localize the failure in decoder module | |
| c) 10V line shorted | Carry out a visual inspection looking for shorts. Once localized, replace fuses in decoder module. | |
| B) Game relay, does not close | a) It does not receive the command impulse | With the test point on input Z and with the machine in game position, TL will be off. Localize failure in MPU module. |
| b) Transistor open | With the test point on input Z and the machine ready for playing, TL will be on. Replace transistor. | |
| C) Game relay is always open | a) Command impulse does not disappear | With the test point on input Z, TL will be always on. See failure in decoder module. |
| b) Closed transistor | With the machine in Game Over and test point on input Z, TL has to be off. Replace transistor. | |
| D) The balldispenser and target relays do not close. | a) Command impulse is not received. | With the test point on input SC; TL will be off. See failure in module MPU. |
| b) Open transistor | TL gets on at SC input at the moment of removing the ball. Replace transistor. | |
| E) The ball dispenser and target relays are always closed. | a) Command impulse does not disappear | With the test point on SC input, TL will be continously on. See failure in MPU module. |
| b) Closed transistor | LT gets on at the moment of dispensing the ball when the test point is on SC input. Replace transistor. | |
| F) The taca relays do not close | a) Command impulse is not received. | With the test point on ZB input TL will be always off. See failure in decoder module. |
| b) Transistor open | With the test point on ZB input. TL will get on when a credit by award is given, Replace transistor. | |
| G) The taca relay is always closed. | a) Command impulse does not disappear | With the test point on ZB input, TL will be always on. See failure in decoder modale. |
| b) Closed transistor. | With the test point on ZB input, TL will get on when a credit by award is given. Replace transistor. |
