Pioneer SD-533HD5 Service Manual page 4

SD-533HD5, SD-643HD5
1.3 CHARGED SECTION, HIGH VOLTAGE GENERATING POINT AND X-RAY
PROTECTION
Charged section
The circuit in which the commercial AC power is used as it is
without passing through the power supply transformer.
If the charged section is touched, there is a risk of electric shock.
In addition, the measuring equipment can be damaged if it is
connected to the GND of the charged section and the GND of the
non-charged section while connecting the set directly to the
commercial AC power supply, In this case, be sure to connect the
set via an insulated transformer and supply the current.
Charged section (Power supply primary side)
1. AC Power Cord
2. The primary side of the POWER SUPPLY Assy
3. POWER SW Assy
: Part is charged section.
: Part is the high voltage generating points other than the
charged section.
CRT SERVICE
Assy B
Deflection
Yoke (L1)
B CRT
DRIVE Assy
POWER
SUPPLY
Assy
AC Power Cord
DEFLECTION
SERVICE Assy
Fig.1 Carged Section and High Voltage Generation Point
4
CRT SERVICE CRT SERVICE
Assy G Assy R
Deflection
Yoke (L3)
Deflection
Yoke (L2)
G CRT R CRT
DRIVE Assy DRIVE Assy
POWER SW
Assy
HV Disributer
FBT
Focus VR
(VR1)
High voltage generating point
The place where voltage of over 100V is generated.
1. Charged section
2. DEFLECTION Service Assy (including FBT)
3. POWER SUPPLY Assy
4. R CRT DRIVE Assy
5. G CRT DRIVE Assy
6. B CRT DRIVE Assy
7. CRT Service Assy R
8. CRT Service Assy G
9. CRT Service Assy B
10. Focus VR (VR1)
11. Deflection Yokes (L1, L2 and L3) Approx. (1100V at peak)
12. HV Distibuter (Anode)
X-ray protection
• Regarding the parts which are relative to radiation of X-rays (There
is the danger to radiate X-ray from the individual CRT Service
Assy R, G, B), there are notifications of caution in the individual
schematic diagrams. Be sure to read them for safety's sake.
• The component parts for X-ray protection are as follows:
When the current flows to the CRT Service Assy R, G, B, be sure
to perform it with these parts being attached.
Protection from the X-ray radiation is maintained in the state in
which these parts have been installed to the CRT Service Assy R,
G, B. Accordingly, never supply current only to the CRT Service
Assy R, G, B.
Moreover, the anode voltage of the CRT Service Assy R, G, B
should always be kept not higher than the predetermined value (in
the minimum brightness and picture state when non signal input
is less than 30.5kV). Be sure to drive the CRT Service Assy R, G,
B by using a completely functional Deflection Service Assy
(including FBT) which have been adjusted completely in the
combined state. (When the voltage abnormally becomes high, the
X-ray protection circuit will operate.)
1. CRT Service Assy R, G, B (Do not dismantle CRT assemblies
under any circumstances).
2. Each Lens Assy
Each Lens Assy
Fig.2 Component parts for X-ray protection
(30.5kV, 1.2kV, 210V, 135V)
(135V)
(10.5kV, 210V)
(10.5kV, 210V)
(10.5kV, 210V)
(30.5kV)
(30.5kV)
(30.5kV)
(10.5kV)
(30.5kV)
CRT Service Assy R, G, B