Technical service manual for the Williams Joust upright arcade game, covering operation, adjustments, and troubleshooting.
This manual provides detailed procedures for operating the Williams Joust upright game, including coin handling, gameplay controls, and high‑score management. It also describes how to configure pricing schemes, set attract‑mode messages, and adjust game parameters.
A large portion of the document is devoted to service and diagnostic information: power‑up tests, ROM and RAM diagnostics, voltage adjustments, and sound‑board troubleshooting. Step‑by‑step instructions are given for restoring factory settings, resetting high‑score tables, and repairing faulty boards.
| ROM type | 4Kx8 PROM (green‑label or yellow‑label) |
|---|---|
| Power‑supply outputs | +5 V, –5 V and +12 V within 2 % of rated output |
| Jumpers for green‑label ROMs | W1 and W3 |
Enter Game‑Over mode, position the cursor on RESET HIGH SCORE TABLE, push the PLAYER 2 joystick right, and press ADVANCE twice.
Open the coin door, set the PRICING SELECTION to zero for a custom scheme, then adjust the left, center, and right slot unit values using the PLAYER 2 joystick and confirm with ADVANCE.
Replace the indicated ROM chip (identified by its two‑digit code) and repeat the diagnostic; if the error persists, check the power‑supply board and jumpers.