Electrical Adjustment - Sharp XV-Z1A Service Manual

NOTE : The settings have been factory-adjusted to their best points. If any of them gets out of spec or after
any relevant part has been replaced, make the related adjustment.
Step
Adjustment Position
1 PLL
(NTSC)
(R4314, R4318)
2 PLL
(PAL)
(R4313, R4320)
3 VCO primary
OSC
(L1001)
4 H-center
(NTSC)(DAC)
5 H-center
(PAL)(DAC)

ELECTRICAL ADJUSTMENT

Adjustment Conditions
1. Receive the monoscope
pattern signal of NTSC.
2. Connect the oscilloscope to
TP4301 and TP4302.
1. Receive the monoscope
pattern signal of PAL.
2. Connect the oscilloscope to
TP4301 and TP4302.
1. No signal.
2. Short the TP1001 and GND.
3. Connect the frequency
counter to TP1002 and
GND.
1. Receive the monoscope
pattern signal of NTSC.
2. Push S2001 and set the fol-
low DAC mode.
Group : VIDEO 1
Subject : H-CENT+9
setting.
Group : TEST
Subject : H-POS
1. Receive the monoscope
pattern signal of PAL.
2. Push S2001 and set the fol-
low DAC mode.
Group : VIDEO 1
Subject : PAL-H-CENT +9
setting.
Group : TEST
Subjec : H-POS
Adjustment Method
» Adjust center level and pulse width of R4314/R3418.
TP4302
TP4301
» Adjust center level and pulse width of R4313/R4320,
same as NTSC.
» Adjust frequency of the core of L1001
fo : 15.625 ±0.01kHz
» Using the Operation key switch
right and left overscan.
Overscan : 93~95%
» Using the Operation key switch
right and left overscan.
Overscan : 93~95%
21
XV-Z1E/A
Center
GND
Center
GND
1µ
' " , adjust same as
' " , adjust same as