NEC N9902 F-1 Service Manual

Also see for AccuSync 95F-1: Service manual

NEC N9902 F-1 Service Manual Manual pdf 11 page image

8(5) FREE RUN Adjustment(A) MODE: 30kHz 70Hz(B) Make TP6 to be short to the ground, and adjust VR306 to make the picture to the normalposition.(6) H.V. Adjustment:(A) MODE: 90.1kHz 110Hz(B) PATTERN: ALL BLACK(Brightness cut off)(C) Adjustment: Adjust VR302 to make the high voltage has 25.8+0.2KV(7) X-RAY test:(A) MODE: 90.1kHz 110Hz(B) PATTERN: CROSSHATCH(Brightness just cut off)(C) Test: a. Make TP1 and TP2 to be short circuit confirm the X-ray reactive.b. Reset the power.(8) H-CENTER Adjustment(A) MODE: 90.1kHz 110Hz(B) PATTERN: CROSSHATCH(C) Adjustment: Adjust VR301 to make raster is centrally on CRT(9) H-size Adjustment:(A) MODE: 53.7kHz 800*600(85)(B) PATTERN: CROSSHATCH(C) Adjust H-SIZE, OSD set to Max, then adjust VR305 to make the full scan.(10) MODE 11 Pre-Adjustment:(A) MODE: 79.9kHz 1280*1024(75)(B) PATTERN: CROSSHATCH(C) Adjust V-CENTER, H-SIZE, V-SIZE, PINCUSHION, TRAPEZOID, H-PHASE to makePicture Position Center and Picture Size 356*267mm.(11) G2 Voltage adjustment (Raster Brightness adjustment)(A) MODE: 79.9kHz 1280*1024(75)(B) PATTERN: ALL BLACK(C) Adjustment:a. WARM UP 30 min.b. Make External Degauss.c. Adjust SCREEN VR to 560+10Vd. CUT OFF Adjustment: Video signal off (0Vp-p), bright VR set to MAX,adjust VR304 VR (G1), at the brightness 1~1.5FL.(4.2+0.8 cd/m²)