1FDL- 3500
SECTION 3
ELECTRICAL ADJUSTMENTS
3- 1. TV SECTIONWAVEFORM CHECK
PRECAUTIONProcedure :
1.Make adjustment in sequence as described.1. Y. signal check (H cycle)
2.Power supply voltage is + 9.0 t O.lV (DC jack end)Input the color bar signal from A/V IN jack (J201).
unless otherwise specified. Power supply shall not beConnect an oscilloscope to TP (Y) to check if the
input overlapped.waveform is as shown in the following figure.
3.Check the error in waveform and screen for adjustment.
White
4.Measure a fluorescent tube and an liquid crystal display---I-(100%)
0.5*o.lvP-P
module device by connecting them with the main board.
-.I.-
5.Unless otherwise specified, input the color bar signal,
etc. from A/V IN jack (J201) by using AV-cord (AVK-
715M, etc.) to intercept the internal TV detection2. Synchro signal check (H cycle)
output.Connect an oscilloscope to TP (SYNC) to check if the
Also, usually use monochromatic gradation wave monowaveform is as shown in the following figure.
scope with chroma signal and burst signal OFF.
--I-
6.Measuring instruments
0.8&O. 1 SVp-p
l NTSC pattern generatorc
t--H-+ -
Il Digital multitester
l Oscilloscope
7.Modes of Switches and Volume3. Color burst signal check (H cycle)
S601 (POWER) . . . . . . . . . . . . . . . . .ONConnect an oscilloscope to Pin @ of IC300 (CHROMA)
S2 (TV BAND) . . . . . . . . . . . . . . . . . ONto check if the waveform is as shown in the following
S18 (VOL -). . . . . . . . . . . . . . . . . ..minimumfigure.
VOLTAGE ADJUSTMENT
Procedure :
1. Connect a digital multitester between TP (+ 5V) andk-----dchroma signal
1
(GND) on the main board, and then adjust RV602 socolor burst signal
that the reading of the voltage is + 4.8 + 0.05V.4. H pulse check (H cycle)
Connect a digital multitester between TP (+ 9V) andConnect an oscilloscope to Pin @ of IC300 (H PULSE)
(GND) and then adjust RV601 so that the reading ofto check if the waveform is as shown in the following
the voltage is + 9 + O.lV.figure.
(+4. SVDC)
Connect a digital multitester between TP (+ 7V) and
--r-
(GND) and then adjust RV701 so that the reading of
3,0k0,4VP-P
the voltage is 6.7 + O.lV.(+secl----
wcLJb
(about 63.5pec)
Adjustment Location: INVERTER BOARD
5. Common signal check (2H cycle)
Connect an oscilloscope to TP (COM) to checkif the
waveform is as shown in the following figure.
V
(63.5psec)
- -
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