— 19 —
GDM-F520
RESISTOR
: RN METAL FILM
: RC SOLID
: FPRD NONFLAMMABLE CARBON
: FUSE NONFLAMMABLE FUSIBLE
: RW NONFLAMMABLE WIREWOUND
: RS NONFLAMMABLE METAL OXIDE
: RB NONFLAMMABLE CEMENT
: ADJUSTMENT RESISTOR
COIL
: LF-8L MICRO INDUCTOR
The components identified by shading and
!
symbol are critical for safety. Replace
only with part number specified.
The symbol
indicates a fast operating fuse and is displayed on the component
side of the board. Replace only with fuse of the same rating as marked.
Les composants identifies per un trame et une marque
!
sont critiques pour la
securite. Ne les remplacer que par une piece portant le numero specifie.
Le symbole
indique une fusible a action rapide. Doit etre remplace par une
fusible de meme yaleur, comme maque.
CAPACITOR
: TA TANTALUM
: PS STYROL
: PP POLYPROPYLENE
: PT MYLAR
: MPS METALIZED POLYESTER
: MPP METALIZED POLYPROPYLENE
: ALB BIPOLAR
: ALT HIGH TEMPERATURE
: ALR HIGH RIPPLE
REFERENCE INFORMATION
SECTION 4: DIAGRAMS
4-1. CIRCUIT BOARDS LOCATION
A2
N
US
H2
D
DA
L2
4-2. PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM INFORMATION
All capacitors are in µF unless otherwise noted. pF : µµF 50WV or less
are not indicated except for electrolytics and tantalums.
All electrolytics are in 50V unless otherwise specified.
All resistors are in ohms. k
Ω
=1000
Ω
, M
Ω
=1000k
Ω
Indication of resistance, which does not have one for rating electrical
power, is as follows:
Pitch : 5mm
Rating electrical power :
1
/
4
W
1
/
4
W in resistance,
1
/
10
W and
1
/
8
W in chip resistance.
: nonflammable resistor.
: fusible resistor.
: internal component.
: panel designation and adjustment for repair.
: earth ground
: earth-chassis
All variable and adjustable resistors have characteristic curve B, unless
otherwise noted.
Readings are taken with a color-bar signal input.
Readings are taken with a 10M
Ω
digital multimeter.
Voltages are DC with respect to ground unless otherwise noted.
Voltage variations may be noted due to normal production tolerances.
All voltages are in V.
S : Measurement impossibillity.
: B+line.
: B-line (Actual measured value may be different).
: signal path (RF).
Circled numbers are waveform references.
The components identified by
X
in this basic schematic diagram
have been carefully factory-selected for each set in order to satisfy
regulations regarding X-ray radiation. Should replacement be necessary,
replace only with the value originally used.
When replacing components identified by
Y
, make the necessary
adjustments as indicated. If the results do not meet the specified value,
change the component identified by
X
and repeat the adjustment until
the specified value is achieved.
(Refer to Section 2: Safety Releated Adjustments.)
When replacing the parts listed in the table below, it is important to
perform the related adjustments.
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
