Yamaha htr-5890 Manuale di servizio - Pagina 25
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- 1. Table of Contents
- 2. Service Manual
- 3. Important Notice
- 4. To Service Personnel
- 5. Front Panel
- 6. Remote Control Panel
- 7. Rear Panels
- 8. Specifications
- 9. Internal View
- 10. Disassembly Procedures
- 11. Updating Firmware
- 12. Self Diagnosis Function (Diag)
- 13. Amp Adjustment
- 14. Display Data
- 15. IC Data
- 16. Remote Control
8. EFFECT OFF / DISPLAY CHECK
This program is used to check the FL display section.
The display condition varies as shown below according
to the sub-menu operation. The signals are processed
using EFFECT OFF (The L/R signal is output using
ANALOG MAIN BYPASS.)
The video signal internal/external synchronization
switching is controlled by the microprocessor. When
the initial message is displayed and all the FL segments
light up, it is switched to the internal synchronization but
o t h e r t h a n t h a t i t i s f o r c e d t o t h e e x t e r n a l
synchronization setting.
Also, except for the initial display, 128 pictographs for
checking the OSD driver are used for the video signal
output display.
Initial display
Segment conditions of the FL driver and the FL tube are checked by turning ON and OFF all segments. Next, the
operation of the FL driver is checked by using the dimmer control. Then a short between segments next to each other is
checked by turning ON and OFF all segments alternately (in lattice). (In the above example, the segments in the second
row from the top are shorted.)
All segments OFF
Lighting of segments
Lighting in lattice
in lattice
Short
Normal
HTR-5890
All segments ON (dimmer 100%)
All segments ON (dimmer 50%)
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