CPD-E440 - Sony Monitor Service Manual (repair manual). Page 9

Part Replaced (    ) 

HV ADJ

RV501

Part Replaced (    ) 

D Board   

IC501,C532, C534, C539, C553,
C554, C555, C556, C558, C561,
R540, R541, R542, R544, R564,
R567, R568, RV501, T501, (FBT)

HV Regulator
Circuit Check

D Board   

IC607, IC901, D515, D517, C540,
C542, C544, C951, R510, R543,
R547, R549, R552, R595, T501
(FBT) 

HV Protector
Circuit Check 

D Board   

IC605, IC607, IC901, C535, C541,
R545, R546, R548, R550, R596,
R934, T501 (FBT)

Beam Current
Protector Circuit
Check

1.  Confi rm that the voltage between cathode of D517 and GND is 

more than 27.0 VDC.

2.  Using an external DC Power supply,  apply the volt age shown 

below between cathode of D517 on D Board and GND, and 
confi rm that the HV Hold-Down circuit works (Raster disappears).  
Apply DC Voltage: Standard Voltage: 35.70 + 0.00, - 0.02 VDC.

       Check Condition
       • Input voltage:     120 ± 2 VAC
       • Input signal:       (fH =69 kHz), White Cross Hatch
       • Beam Control:   CONT, BRT, minimum "0"

The current must be within the range show below:

       • Standard current:  

170 VAC +0.00, -0.10 mA

1.  Using an external current source, apply < 1.55mA between 

pin 

11

 of FBT (T501) and GND.

2.  Gradually decrease the resistance of the variable resistor from 

maximum to minimum.

3.  Confi rm that the raster fades out.

       Check Condition
       • Input voltage:     120 VAC ± 2 VAC
       • Input signal :      (fH = 69kHz), White Cross Hatch 
       • Beam Controls: CONT, BRT : minimum "0"

1.  Input white cross hatch (fH = 68.7 kHz) signal.

2.  CONT (max) &  BRT (center).

3.  Input voltage: 120 VAC.

 

Note:  Use NF power supply or make sure that dis tortion factor 
is 3% or less.

4.  Confi rm that the voltage is within the range shown below:

       • Standard current:  

170 VAC ± 3.0 V DC

 

Allow the unit to warm up for one minute prior to checking the 
following conditions.

1.  Input white cross hatch signal (fH = 80 kHz).

2.  CONT maximum and BRT center.

3.  Cut off Screen VR (G2).
4.  Input voltage: 120 ± 2 VAC.
5.  Confi rm that the voltage is within the voltage range shown below:

 

  

Standard voltage: 26.0 +0.3, -0.5 kV

6.  When replacing components identifi ed by Y , make sure to 

recheck the High Voltage.

7.  Verify the High Voltage as shown above (26.9 +0.3, -0.5 kV) is 

within specifi cation.  If not, set H. SIZE data at  minimum (-127) 
and then adjust RV501 on D Board (Adjustment target = 26.0 ± 
0.2 kV).

8.  After adjusting the High Voltage within specifi cation, put the RV 

cover on RV501 as shown below and apply suffi cient amount of 
RTV around RV501.

RV501

104