PVM-1353MD/1453MD
SECTION 4
SAFETY RELATED ADJUSTMENT
The following adjustments should always be perfonned when
replacing the following components (marked with
B , [:.ii on the
schematic diagram).
+B detection ····· .. ························BR1535
Tertiary coil detection····················BR1536
Part replaced (
[;jj)
Hold Down Circuit ···········Gil A board ICSOO, IC507, DSOl,
D533, C506, C512, C523,
C549, C592, R506, R518,
R519, RSSl, Rl536,
Rl537,Rl560,T501
Beam Current Protector
Circuit···························GiilA board QSOO, QSll, C513, R508,
R515, R516, R517
B+ Regulator Circuit···
······Gil A board Rl535
Gil G board IC602, C603
I B+ VOLTAGE CONFIRMATION I
Standard: less than 117.0VDC
Check Condition : Input voltage: 110
± t V AC
Note : Use NF Power Supply or make sure that
distortion factor is 3% or less.
Input signal : Monoscope signal
Controls : BRT & CONT
cc:> Initial reset
I HOLD-DOWN CIRCUIT VOLTAGE CONFIRMATION I
(1) Hold down circuit (B+ Actuation)
a) When IABL
= 600 ± SOµA, raster goes out at less than
130
±~: V by applying an external DC voltage to ICSOO@
pin (TP502).
Input signal : ALL white
b) When IABL
= 40 ± 20µA, raster goes out at less than 132
±~: V by applying an external DC voltage to ICSOO@ 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 ICSOO.
-36-
a) When IABL = 600 ± SOµA, raster goes out when applying
less than DC 146.7V voltage to the
@ pin (TP503) of
ICSOO from outside.
Input signal : ALL white
b) When IABL
= 40 ± 20µA, raster goes out when applying
less than DC 147.0V voltage to the
@ pin (TP503) of
ICSOO from outside.
Input signal : Dot
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