21st C Title Rack Service Manual

This official Sound Leisure technical guide provides focused adjustment and fault finding instructions for the 21st Century Title Rack mechanism, used in a range of Sound Leisure jukebox models.

The document is intended for engineers and service technicians and concentrates specifically on correct mechanical alignment, sensor positioning, and belt adjustment rather than general jukebox operation. It outlines a structured diagnostic process to ensure smooth, accurate page turning and reliable end of travel detection.

Step by step guidance explains how to inspect the drive pulley and confirms correct engagement of the grub screw with the dimpled motor shaft, noting acceptable gearbox backlash levels. Clear instructions are provided for belt tension adjustment, explaining how excessive tension can cause sluggish operation while insufficient tension may result in tooth jumping.

The guide details precise positioning of the pecker tooth relative to the title pages, alongside accurate alignment of the opto sensors. Instructions specify how the centre opto must align with a belt hole, while the outer optos must sit evenly clear of adjacent holes. Adjustment guidance is provided for lateral, vertical, and depth positioning using the slotted opto bracket and PCB.

A dedicated fault diagnosis section explains common symptoms and their likely causes, including incorrect motor wiring, inverted optos, faulty or contaminated sensors, dry joints, harness faults, and pulley slippage. The document also includes specific notes for Limelite models with single toothed peckers, highlighting the importance of minimal clearance at the page pivot holes to prevent missed page turns.

This guide serves as a concise but critical reference for maintaining correct operation of Sound Leisure 21st Century Title Rack systems, and should be used alongside the relevant jukebox service or mechanism manual.