CPD-G420 (serv.man4) - Sony Monitor Service Manual (repair manual). Page 12

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CPD-G420
2-1.  HV REGULATOR CIRCUIT CHECK
1.  Turn the RV901 slowly, and adjust so that high voltage is in the 
speciÞ ed range.
 [SpeciÞ cation]:  27.00 ± 0.05 kV
2.  Check that the voltage of D912 cathode on the D board is 17.0V 
or more.
2-2.  HV PROTECTOR CIRCUIT CHECK
1.  Using external DC Power Supply, apply the voltage shown below 
between cathode of D912 and GND, and check that the RASTER 
disappears.
 [SpeciÞ cation]:  19.95 ± 0.00/-0.05V
2-3. BEAM CURRENT PROTECTOR 
CIRCUIT CHECK
1.  Connect constant current source to a section between T901 
(FBT) 
11
 pin and GND, and check that the RASTER 
disappears when the speciÞ ed current ß ows to the  
11
 pin.
 [SpeciÞ cation]:  2.12 ± 0.00/-0.051 mA
SECTION  2: SAFETY RELATED ADJUSTMENTS
When replacing parts shown in the table below, the following 
operational checks must be performed as a safety precaution 
against X-ray emissions from the unit.
 
Allow the unit to warm up for one minute prior to checking the 
following conditions.
Part Replaced (    ) 
HV ADJ
RV901
Part Replaced (    ) 
D Board   C925, IC901, R901, R902, R905,
R924, R925, R926, RV901, 
T901 (FBT),
•  Mounted D Board
HV Regulator
Circuit Check
D Board   
C920, C923, D911, D912, R903, 
R917, R918, R919, R920, R923, 
T901 (FBT)  
•  Mounted D Board
N Board   
IC1001, RB1001
•  Mounted N Board  
N Board   
IC1001, RB1001
•  Mounted N Board  
HV HOLD
DOWN  
Circuit Check
D Board   
C930, D917, R921, R932, R933, 
R935, T901 (FBT) 
•  Mounted D Board
Beam Current
Protector  
Circuit Check
 ConÞ rm one minute after turning on the power.

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