![2022-11-17_glamour.jpeg](https://cdn-learn.adafruit.com/user_assets/assets/000/000/058/large1024/2022-11-17_glamour.jpeg?1671432390)
The Ibanez FL9 Flanger Service Guide was compiled from a collection of original and obsolete information to create a useful guide for maintaining this unique guitar pedal. Credit must be given to the authors of the original 1980s era Service Manual NO. 002 that was used as a template for this updated guide.
![old_manual_composite.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/059/large1024/old_manual_composite.png?1671432592)
November 26, 2022, Cedar Grove Studios
The .pdf version of the guide and detailed repair blog can be downloaded from the project repository:
FL9 Detailed Repair Blog (.pdf)
Also available is a KiCAD folder of the as-built PCB design, contained in the project repository:
FL9 PCB Reverse Engineered Design (KiCAD folder)
![PCB_3D_render_glamour.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/061/large1024/PCB_3D_render_glamour.png?1671433116)
![FL9_block_diagram.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/062/large1024/FL9_block_diagram.png?1671433204)
CLOCK
![clock_waves_composite.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/063/large1024/clock_waves_composite.png?1671433430)
- Set SPEED, REGEN, WIDTH, and DELAY TIME controls fully counter-clockwise (CCW).
- Connect an oscilloscope to test point CP1.
- Adjust VR101 CLOCK TRIM for a frequency of 40kHz.
- Set DELAY TIME control fully clockwise (CW) and check CP1 frequency. Should be in the range of 500kHz to 600kHz.
- Set WIDTH control fully CW and check CP1 frequency sweep. The range should be from 40kHz to 500kHz-600kHz.
BIAS
![bias_wave.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/065/large1024/bias_wave.png?1671433699)
- Set REGEN and WIDTH controls fully CCW.
- Connect a +5dBm to +10dBm (2.5 volt) 440Hz sine wave to the INPUT.
- View the waveform on test point CP12. Adjust VR102 BIAS to achieve a symmetrically-clipped waveform.
REGEN
- Set SPEED, REGEN, and WIDTH controls fully CW.
- Connect an oscilloscope to the OUTPUT with no INPUT signal
- Adjust VR103 REGENERATION TRIM until oscillation is seen. Back down VR103 REGENERATION TRIM about 10 degrees to squelch the oscillation.
![FL9_PCB_BOT_testpoints.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/066/large1024/FL9_PCB_BOT_testpoints.png?1671434205)
![FL9_cp_waveforms.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/067/large1024/FL9_cp_waveforms.png?1671434270)
![PCB_ortho_render_TOP.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/068/large1024/PCB_ortho_render_TOP.png?1671434484)
![PCB_TOP_BOT_layout.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/074/large1024/PCB_TOP_BOT_layout.png?1673074958)
Schematic Diagram
![schematic.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/070/large1024/schematic.png?1671434978)
![FL9_troubleshooting_01.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/071/large1024/FL9_troubleshooting_01.png?1671435345)
![FL9_troubleshooting_02.png](https://cdn-learn.adafruit.com/user_assets/assets/000/000/072/large1024/FL9_troubleshooting_02.png?1671435362)