— 14 —
HMD-A240
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 speci
Þ
ed.
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.
: non
ß
ammable resistor.
: fusible resistor.
: internal component.
: panel designation and adjustment for repair.
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.
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 identi
Þ
ed by shading and
!
symbol are critical for safety. Replace
only with part number speci
Þ
ed.
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 identi
Þ
es per un trame et une marque
!
sont critiques pour la
securite. Ne les remplacer que par une piece portant le numero speci
Þ
e.
Le symbole
indique une fusible a action rapide. Doit etre remplace par une
fusible de meme yaleur, comme maque.
The components identi
Þ
ed 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 identi
Þ
ed by
Y
, make the necessary
adjustments as indicated. If the results do not meet the speci
Þ
ed value,
change the component identi
Þ
ed by
X
and repeat the adjustment until
the speci
Þ
ed value is achieved. (See page 10)
When replacing the parts listed in the table below, it is important to
perform the related adjustments.
CAPACITOR
: TA TANTALUM
: PS STYROL
: PP POLYPROPYLENE
: PT MYLAR
: MPS METALIZED POLYESTER
: MPP METALIZED POLYPROPYLENE
: ALB BIPOLAR
: ALT HIGH TEMPERATURE
: ALR HIGH RIPPLE
SECTION 4: DIAGRAMS
Part Replaced ( )
HV ADJ
RV501
Part Replaced ( )
D Board
T501, IC501, RV501, R540,
R541, R542, R544, R564, R567,
R568, C532, C534, C539, C553,
C554, C555, C556, C558, C561
HV Regulator
Circuit
D Board
T501, R510, R543, R547, R549,
R552, R595, D515, D517, C540,
C542, C544, IC607, IC901, C951
HV HOLD
DOWN Circuit
D Board
T501, R545, R546, R548, R550,
R596, R934, C535, C541, IC605,
IC607, IC901
Beam Current
Protector Circuit
REFERENCE INFORMATION
4-1. CIRCUIT BOARDS LOCATION
J Board
H Board
A Board
D Board
