Read Sony DHC-FL3 / GDM-C520 / GDM-C520K / HCD-FL3 Service Manual online
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GDM-C520/C520K
2-1. HV REGULATOR CIRCUIT CHECK
1. Turn the RV901 slowly, and adjust so that high voltage is in the
specified range.
[Specification]: 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.
[Specification]: 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 specified current flows to the
11
pin.
[Specification]: 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.
Confirm one minute after turning on the power.
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
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