AC100V -- AC120V
MULTI PROJECTION UNIT
O - ZZC JUNE 1998 Printed in Japan
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road, #10-00 Wheelock Place, Singapore 238880
PIONEER ELECTRONIC CORPORATION 1998
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
1. SAFETY INFORMATION ...................................... 2
2. EXPLODED VIEWS AND PARTS LIST ................ 5
3. SCHEMATIC DIAGRAM ..................................... 14
4. PCB CONNECTION DIAGRAM .......................... 82
5. PCB PARTS LIST ............................................. 104
6. ADJUSTMENT .................................................. 114
7. GENERAL INFORMATION .............................. 152
7.1 IC ............................................................... 152
7.2 DIAGNOSIS ............................................... 157
7.2.1 DISASSEMBLY ................................. 157
7.2.2 PCB LOCATIONS ............................. 160
7.2.3 ASSEMBLING OF SCREEN ............. 161
7.2.4 REPLACING THE CRT ASSY .......... 163
7.2.5 TROUBLE SHOOTING ..................... 165
7.3 BLOCK DIAGRAM ..................................... 170
8. SPECIFICATIONS ............................................ 174
9. PANEL FACILITIES AND SPECIFICATIONS .. 175
1. SAFETY INFORMATION
This service manual is intended for qualified service technicians; it is not meant for the casual do-it-
yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to
properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void the
warranty. If you are not qualified to perform the repair of this product properly and safely, you should not
risk trying to do so and refer the repair to a qualified service technician.
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of
California to cause cancer, birth defects or other reproductive harm.
Health & safety code section 25249.6--Proposition 65
(FOR CANADIAN MODEL ONLY)
(fast operating fuse) and/or
(slow operating fuse) on PCB indicate that replacement parts must
be of identical designation.
(POUR MODELE CANADIEN SEULEMENT)
Les symboles de fusible
(fusible de type rapide) et/ou
(fusible de type lent) sur CCI indiquent que les pièces de
remplacement doivent avoir la même désignation.
1.1 SAFETY PRECAUTIONS
NOTlCE: Comply with all cautions and safety related notes
located on or inside the cabinet and on the chassis or pic-
The following precautions should be observed:
1. Do not install, remove, or handle the picture tube in any
manner unless shatterproof goggles are worn. People
not so equipped should be kept away while picture tubes
Keep picture tube away from the body while handling.
2. When service is required, even though the PROJEC-
TION UNIT an isolation transformer should be inserted
between power line and the set in safety before any ser-
vice is performed.
3. When replacing a chassis in the set, all the protective
devices must be put back in place, such as barriers,
nonmetallic knobs, adjustment and compartment
covershields, isolation resistor-capacitor, etc.
4. When service is required, observe the original lead
Extra precaution should be taken to assure correct lead
dress in the high voltage circuitry area.
5. Always use the manufacturer's replacement compo-
nents. Especially critical components as indicated on the
circuit diagram should not be replaced by other
Furthermore where a short circuit has occurred, replace
those components that indicate evidence of overheating.
6. Before returning a serviced set to the customer, the ser-
vice technician must thoroughly test the unit to be certain
that it is completely safe to operate without danger of
electrical shock, and be sure that no protective device
built into the set by the manufacturer has become defec-
tive, or inadvertently defeated during servicing.
Therefore, the following checks should be performed for
the continued protection of the customer and service
Leakage Current Cold Check
With the AC plug removed from l20V AC 60Hz source, place
a jumper across the two plug prongs. Turn the AC power
switch on. Using an insulation tester (DC 500V), connect
one lead to the jumpered AC plug and touch the other lead to
each exposed metal part ( input/ output terminals,
screwheads, metal overlays, control shafts, etc.), particu-
larly any exposed metal part having a return path to the
chassis. Exposed metal parts having a return path to the
chassis should have a minimum resistor reading of 0.3MW
and a maximum resistor reading of 5MW. Any resistor value
below or above this range indicates an abnormality which
requires corrective action. Exposed metal parts not having a
return path to the chassis will indicate an open circuit.
Leakage Current Hot Check
Plug the AC line cord directly into a 120V AC 60Hz out-
let ( do not use an isolation transformer for this check
). Turn the AC power switch on.
Using a "Leakage Current Tester ( Simpson Model 229
equivalent )", measure for current from all exposed
metal parts of the cabinet ( input / output terminals,
screwheads, metal overlays, control shaft, etc. ), par-
ticularly any exposed metal part having a return path
to the chassis, to a known earth ground ( water pipe,
conduit, etc.). Any current measured must not exceed
not be above
Also test with
(Using AC adapter
plug as required)
In the status of the black picture ( video muting is
being applied ) when no signal is input, high volt-
age of this set during operation is less than 30.9kV.
In case any component having some relation to the
high voltage is replaced, confirm that the high volt-
age is lower than 30.9kV in the status of the black
picture when no signal is input.
To measure H.V. use a high impedance H.V. meter.
Connect ( - ) to earth and ( + )to the FBT anode cable
(Refer to page 90)
TUBE: The primary source of X-radiation in this set
is the picture tube.
For continued X-radiation protection, the replace-
ment tube must be the same type as the original,
PIONEER approved type.
The picture tube (the CRT assy R, G, B ) use in this
set holds complete guarantee against X-ray radia-
tion when the X-ray is sealed ( See page 4 ). Ac-
cordingly, when the current in flowing to the pic-
ture tube be sure to perform it by putting the tube
into X-ray sealed applied state. Avoid absolutely to
flow the current to the picture tube itself. More-
over, when the voltage of the high voltage circuit
becomes abnormally a little higher, the picture
tube radiates X-rays. Accordingly, when servicing
the high voltage circuit be sure to replace as an as-
sembly with the POWER SUPPLY assy in the
manner in which has been adjusted to perform nor-
1.2 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in PIONEER
set have special safety related characteristics.
These are often not evident from visual inspection
nor the protection afforded by them necessarily
can be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement
parts which have these special safety characteris-
tics are identified in this Service Manual.
Electrical components having such features are
identified by marking with a
on the schematics
and on the parts list in this Service Manual.
The use of a substitute replacement component
which does not have the same safety characteris-
tics as the PIONEER recommended replacement
one, shown in the parts list in this Service Manual,
may create shock, fire, X-radiation, or other
Product Safety is continuously under review and
new instructions are issued from time to time. For
the latest information, always consult the current
PIONEER Service Manual. A subscription to, or ad-
ditional copies of PIONEER Service Manual may be
obtained at a nominal charge from PIONEER.
ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED
ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD
AND MUST BE CORRECTED BEFORE RETURNING THE SET TO
This set is provided with a X-ray protection for clearly
indicating that voltage has increased in excess of a
predetermined value. Comply with all notes described
in this Service Manual regarding this hold down cir-
cuit when servicing, so that this X-ray protection may
correctly by operated.
1.3 CHARGED SECTION, HIGH VOLTAGE
GENERATING POINT AND X-RAY PRO-
7 Charged section
The places where the commercial AC power is used with-
out passing through the power supply transformer. If the
places are touched, there is a risk of electric shock. In addi-
tion, the measuring equipment can be damaged if it is con-
nected 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. Therefore, be sure to
connect the set via an insulated transformer and supply the
1. AC power cord
2. AC inlet
3. AC power switch (S1)
4. AC outlet
6. STB transformer and Converter transformer
7. Other primary side of the AC POWER assembly
For the places, refer to the EXPLODED VIEWS ,the SCHE-
MATIC DIAGRAM and the PCB CONNECTION DIAGRAM
7 High voltage generating point
The places where voltage is 100V or more except for the
charged places described above. If the places are touched,
there is a risk of electric shock.
1. POWER SUPPLY assy
2. R. CRT DRIVE assy
3. G. CRT DRIVE assy
4. B. CRT DRIVE assy
5. H.V assy & DEFLECTION assy (30.5kV,220V)
6. CRT assy R
7. CRT assy G
8. CRT assy B
9. Focus variable resistor(VR1)
10. Deflection yokes (L1, L2 and L3) Approx. (1100V at peak)
11. Yoke connection assy B Approx. (1100V at peak)
Regarding the parts which are relative to radiation of X-rays
( There is the danger to radiate X-ray from the each CRT
assy R, G, B), there are notifications of caution in the indi-
vidual schematic diagrams. Be sure to read them for
The component parts for X-ray protection are as follows :
When the current flows to the CRT assy , 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 assy. Accordingly, never
supply current only to the CRT assy.
Moreover, the anode voltage of the CRT assy should al-
ways be kept not higher than the predetermined value (in
the minimum brightness and picture state when non signal
input is higher than 30.5kV ). Be sure to drive the CRT assy
by using a completely functional POWER SUPPLY assy
which have been adjusted completely in the combined
state. (When the voltage abnormally becomes high, the X-
ray protection circuit will operate.)
1.The each CRT assy (Never disassemble .)
2.The each Lens assy
Fig. 3-2 Component parts for X-ray protection
Fig. 3-1 Charged section and high voltage generating point
: Part is the charged section.
: Part is the high voltage generating
points other than the charged section.
Rear LED assy
Conv. AMP assy
R CRT drive assy
G CRT drive assy
B CRT drive assy
Fan connection B assy
Fan connection A assy
Yoke connection assy A
Yoke connection assy B
Power supply assy
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING (MAIN BLOCK)
SYLINDRICAL SUPPORT B
CARD BOARD PAD L
SYLINDRICAL SUPPORT A
PAD C UPPER L
PAD C UPPER R
CARD BOARD PAD R
MIRROR MAT (50)
MIRROR MAT B
VINYL SHEET S
( English / French )
CONICAL NUT M8
6P MINI DIN WITH CORD
UL SAFE CARD
Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
Screws adjacent to
mark on product are used for disassembly.
¶ Parts marked by are important parts which relate in X-rays radiation.
If any of these parts need to be replaced, always replace with specified parts.