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SECTION 4
SAFETY
RELATED ADJUSTMENT
The following adjustments should always be performed when
replacing the following components (marked with 94 , [@ on the
schematic diagram).
4B detection --:-:ccssssscccsssccceesssceees BAR1535
Tertiary coil detection-++++++++++++++++++ b4R1536
Part replaced ( [4 )
Hold Down Circuit -+++++++-++ (4A board IC500, ICS07, D501,
D533, C506, C512, C523,
C549, C592, R506, R518,
R519, R551, R1536,
R1537, R1560, TS01
Beam Current Protector
Chreuitessssecissceevessesscsses (4A
board Q500, Q511, C513, R508,
R515, R516, R517
B+ Regulator Circuit +--++-++ [4A
board R1535
(4G board IC602, C603
B+ VOLTAGE CONFIRMATION
Standard : less than 117.0VDC
Check Condition : Input voltage : 110 +3 VAC
Note: Use NF Power
Supply
or make
sure
that
distortion factor is 3% or less.
Input signal : Monoscope signal
Controls : BRT & CONT & Initial reset
HOLD-DOWN CIRCUIT VOLTAGE CONFIRMATION
(1) Hold down circuit (B+ Actuation)
a) When JABL = 1000 + S50zA, raster goes out at less than
130.5 +{c V by applying an external DC voltage to IC500
@® pin (TPS02).
Input signal : ALL white
b) When IABL = 120 + 20yA, raster goes out at less than
133.5 +6 V by applying an extemal DC voltage to IC500
@ pin (TP502).
Input signal : Dot
(2) Hold down circuit (Tertiary coil detection voltage)
Confirmatory item : 110.0V voltage should be applied to the
@ pin of IC500.
a) When IABL= 1000+50A, raster goes out when applying
less than DC 148.0V voltage to the @ pin (TP503) of
IC5S00 from outside.
Input signal : ALL white
b) When IABL = 120 + 20A, raster goes out when applying
less than DC 148.5V voltage to the @ pin (TP503) of
IC500 from outside.
Input signal : Dot
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