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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. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER ELECTRONIC CORPORATION 1999
K-ZZA. FEB. 1999 Printed in Japan
ORDER NO.
CRT2361
BRIDGEABLE POWER AMPLIFIER
PRS-X720
X1R/UC
Service
Manual
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST .......................2
3. SCHEMATIC DIAGRAM ...........................................10
4. PCB CONNECTION DIAGRAM ................................28
5. ELECTRICAL PARTS LIST ........................................40
6. ADJUSTMENT..........................................................48
7. GENERAL INFORMATION .......................................49
7.1 IC .........................................................................49
7.2 DISASSEMBLY ...................................................50
8. OPERATIONS AND SPECIFICATIONS.....................51
PRS-X320
X1R/UC
PRS-X220
X1R/UC
PRS-X720/X1R/UC


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2
PRS-X720,X320,X220
CAUTION
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.
WARNING
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
1. SAFETY INFORMATION
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING


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PRS-X720,X320,X220
3
- Owner's Manual
Model
Part No.
Language
PRS-X720/X1R/UC
HRD0087
English, French
PRS-X320/X1R/UC
PRS-X220/X1R/UC
- PACKING SECTION PARTS LIST
NOTE:
- Parts marked by "*" are generally unavailable because they are not in our Master Spare Parts List.
- Screws adjacent to
mark on the product are used for disassembly.
Part No.
Mark No. Description
PRS-X720/X1R/UC PRS-X320/X1R/UC PRS-X220/X1R/UC
1 Screw Assy
HEA0047
HEA0047
HEA0047
2 Screw
BYC40P180FZK
BYC40P180FZK
BYC40P180FZK
3 Polyethylene Bag
HEG0011
HEG0011
HEG0011
4 Screw
SMZ50H300FCR
SMZ50H300FCR
SMZ50H300FCR
5 Polyethylene Bag
HEG0022
HEG0022
HEG0022
6 Carton
HHG0170
HHG0171
HHG0172
7 Contain Box
HHL0170
HHL0171
HHL0172
8 Protector
HHP0043
HHP0043
HHP0043
9 Protector
HHP0063
HHP0064
HHP0065
*
10 Spec Sheet
HRB0044
HRB0043
HRB0040
11 Owner's Manual
HRD0087
HRD0087
HRD0087
*
12 Warranty Card
HRY1070
HRY1070
HRY1070


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4
PRS-X720,X320,X220
2.2 EXTERIOR(PRS-X720/X1R/UC)


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PRS-X720,X320,X220
- EXTERIOR SECTION PARTS LIST
Mark No. Description
Part No.
Mark No. Description
Part No.
1 Screw(M3
×12)
CBA1323
2 ·····
*
3 Badge
HAM0013
4 Screw(M3
×5)
HBA0006
5 Screw(M3
×8)
HBA0011
6 Insert
HBN0003
7 Case
HNB0087
8 Case
HNB0089
9 Heat Sink
HNR0110
10 Bracket
HNS0070
11 Bracket
HNS0071
12 End Cap
HNS0072
13 Spacer
HNV0016
14 Amp Unit
HWH0091
15 Screw
BBZ30P060FMC
16 ·····
17 Screw(M3
×14)
CBA1382
18 Terminal(CN905)
CKF1059
19 Fuse(30A)
HEK0030
20 Pin Jack(CN851)
HKB0006
21 Fuse Holder
HKE0012
22 Terminal(CN901)
HKE0020
23 Terminal(CN551)
HKE0021
24 Terminal(CN552)
HKE0021
25 Clip
HNC0054
26 Heat Sink
HNR0113
27 Heat Sink
HNR0114
28 Bar
HNR0124
29 Screw
PPZ30P100SAD
30 Light Pipe Unit
HXA0201
31 Screw
PPZ30P100FZK
32 Thermistor(TH901, 902)
CCX1013
33 FET(Q561-566)
94-4980
34 FET(Q905, 906, 911-914) STP50NE08
35 Transistor(Q907)
2SD2395
36 Diode(D907)
FML22S
37 FET(Q567-572)
94-4981
38 Transistor(Q908)
2SB1566
39 Diode(D910)
FML22R
40 Variable Resistor(VR453) CCS1265
41 Volume(VR451)
HCS0001
42 Variable Resistor(VR452) CCS1263
43 Variable Resistor(VR101) CCS1266
44 Screw(M3
×14)
HBA0017
45 Screw
SMZ50H300FCR