Safety Related Adjustment - Sony trinitron PVM-1450QM Service Manual

PVM-1450QM/1454QM
SECTION 4
SAFETY RELATED ADJUSTMENT
The following adjustments should always be performed when
replacing the following components (marked with
B,
[;ii on the
schematic diagram).
+B detection ...........................
B
R1535
Tertiary coil detection ...............
B
Rl536
Part replosed(
[;ii)
Hold Down Circuit.. ....... [;ii A board ICSOO, D533, R1537, C592,
Rl536, C523, Rl560, R551,
C549, R518, C506, C512,
D501, R506, R519, TSO!,
IC507
Beam Current Protector
Circuit ........................ [;ii A board R508, R515, R516, RS! 7,
C513, QSOO, QSll
B+ Regulator Circuit...... [;ii A board Rl535
[;ii G board C603,IC602
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B+ MAX VOLTAGE CONFIRMATION (RV601)
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Standard: 115.0-117.0 VDC
Check Condition: Input voltage: 130-132 VAC
Note : Use NF Power Supply or make sure that
distortion factor is 3% or less.
Input signal : ALL White
Controls : BRT & CONT
~
Minimum
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HOLD-DOWN CIRCUIT VOLTAGE CONFIRMATION
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Check Condition : Input voltage : 130-132 V AC
Input signal : monoscope signal
Controls : BRT
&
PIC
~
initial reset
B+ voltage : Less than 117.0 V
R690
(1) Hold down circuit (+B Actuation)
a) When IABL = 600
±
50 µ A, raster goes out at less
than 130.5 V of +B voltage (TP502) by adjusting
1::-, R690 and RV601.
Input signal : ALL white
1::-, R690 : 470-5.6k 1/4 W RN
b) When IABL = 120
±
20 µ A, raster goes out at less than
134Vof +B voltage(TP502)by adjusting 1::-, R690 and RV601.
Input signal : Dot
(2) Hold down circuit (Tertiary coil detectiol\ voltage)
Confirmatory item : 110.0 V voltage should be applied to
the (11) pin of ICS00.
a) When IABL = 600
±
50 µ A, raster goes out when
applying less than DC 146.7 V voltage to the (11)
pin (TP503) of ICSOO from outside.
Input signal : ALL white
b) When IABL = 40
±
20 µ A, raster goes out when
applying less than DC 147.0 V voltage to the (11)
pin (TP503) of ICS00 from outside.
Input signal : Dot
..d!lll!ll!ll! ....
(CONDUCTOR SIDE)
- 29-
PVM-1450QM/1454QM
(COMPONENT SIDE)
'
ABOARD
~03
digital multimeter
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(COND~CTOR SIDE)
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30-