Ikegami HTM-1517R, Service Manual

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1-B-6
MPU BOARD
(1) Circuit Structure
(a) MPU Circuit
(b) I/O Circuit
(c) RAM back up Circuit
(d) OSD character generator, Marker display color setting Circuit
(e) D/A, S/H Circuit
(f) TEST signal, MARKER signal generator Circuit
(2) Adjustment Method
(a) S201 [DIP Switch]
S202 [Rotary Switch]
1. S202 is used for setting monitor varieties.
1990 : HTM-1990R
1917/1517 : HTM1517R/HTM-1917R
CS
: HTM-1517CS
2. S201 is used to set modes to which monitor responds.
PH-C : Set default value of quasi-SMTE-C phosphor function
SMPTE = ON, P22(EBU) = OFF
9300K : Not used (set to OFF)
TM20-80 : Not used (set to OFF)
1080i/50 : 1080i/50 format response = ON
1080i/48 : 1080i/48(1080psF/24) format response = ON
480p : 480p format response = ON
720p/50 : 720p/50 format response = ON
(b) VR201 [MK LVL]
VR401 [TEST-S LVL]
VR402 [DA LVL]
1. The VR201 is used to adjust the contrast level of the marker. It is usually set in the center.
2. Turn the marker OFF and display the crosshatch of the internal TEST signal.
Adjust the VR401 so that the signal level at TP403 is 1.0 ± 0.01Vp-p.
3. Switch the internal TEST signal to WINDOW.
Adjust the VR402 so that the signal level at TP403 is 1.28 ± 0.01Vp-p.
(c) VR301 [4:3 U-CONT]
VR302 [16:9 N-CONT]
VR303 [16:9 U-CONT]
1. Input the WINDOW(100%) signal from TEST Generator.
Adjust the CONTRAST level so that the value is 120cd/m
2
during 4:3 NORMAL SCAN Display.
Adjust VR301 so that the value is 120cd/m 2 during 4:2 UNDER SCAN Display.
Adjust VR302 so that the value is 120cd/m
2
during 16:9 NORMAL SCAN Display.
Adjust VR303 so that the value is 120cd/m
2
during 16:9 UNDER SCAN Display.
(d) VR403 [WIND LV]
Adjustment not necessary.