Pioneer PRO-730HD Service Manual page 4

1
3. CHARGED SECTION, HIGH VOLTAGE GENERATING POINT AND X-RAY
PROTECTION
A
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.
B
Charged section
(Power supply primary side)
1. AC Power Cord
2. The primary side of the POWER SUPPLY Assy
3. POWER SW Assy
C
: Part is charged section.
: Part is the high voltage generating points other than the
charged section.
CRT SERVICE
Assy B
D
Deflection
Yoke (L1)
B CRT
DRIVE Assy
E
POWER SUPPLY
Assy
AC Power Cord
Fig.1 Carged Section and High Voltage Generation Point
F
4
1
2
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 Distributor
Focus VR
(VR1)
DEFLECTION
FBT
SERVICE Assy
2
3
High Voltage generating point
The place where voltage of over 100V is generated.
1. Charged section
2. DEFLECTION Service Assy
(including FBT)......................(30.5kV, 1.2kV, 210V, 120V)
3. POWER SUPPLY Assy...........................................(120V)
4. R CRT DRIVE Assy....................................(10.5kV, 210V)
5. G CRT DRIVE Assy....................................(10.5kV, 210V)
6. B CRT DRIVE Assy....................................(10.5kV, 210V)
7. CRT Service Assy R.............................................(30.5kV)
8. CRT Service Assy G.............................................(30.5kV)
9. CRT Service Assy B.............................................(30.5kV)
10. Focus VR (VR1)...................................................(10.5kV)
11. Deflection Yokes (L1, L2 and L3)
12. HV Distributor(Anode) .........................................(30.5kV)
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
Fig.2 Component parts for X-ray protection
PRO-730HD
3
4
..............Approx. (1100V at peak)
Each Lens Assy
CRT Service Assy R, G, B
4