My LK-500NTB QSK board has 4ea AZB-1CH-12DE DIP and 1ea RJ1A relays. The LK-Series manual QSK schematic shows 3 DIP and 1 Vacuum. The manual parts lists show AROMAT D2SE relays, 3 ea on QSK bd, 1ea on ALO bd, 6ea on ATI-6 bd. Seems the schematics do not quite represent the as-built configuration. Arne N7KA