Pioneer VSA-E07 User manual

ORDER NO.
PIONEER 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
PIONEER CORPORATION 1999
RRV2203
T – ZZK SEPT. 1999 Printed in Japan
CONTENTS
1. CONTRAST OF MISCELLANEOUS PARTS........2
2. PCB CONNECTION DIAGRAM............................9
3. SCHEMATIC DIAGRAM .....................................10
4. REMOTE CONTROL UNIT.................................20
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
AUDIO/VIDEO MULTI-CHANNEL AMPLIFIER
VSA-E07
Type Model Power Requirement The voltage can be converted by
VSA-E07 the following method.
HY ‡AC220-230V AC240V, ∗
HV ‡AC230V AC240V, ∗
∗:Alter the wiring of the Power-supply block at the primary winding of Power-transformer referring to the "Line Voltage Selection" described
in Service Manual.
Model No. Order No. Remarks
VSX-908RDS-G/HY RRV2166
¶This service manual should be used together with the following manual(s):

VSA-E07
2
1. CONTRAST OF MISCELLANEOUS PARTS
Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
The 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.
Reference Nos. indicate the pages and Nos. in the service manual for the base model.
NOTES:
When ordering resistors, first convert resistance values into code form as shown in the following examples.
Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J=5%,
and K=10%).
Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).
561
473
R50
1R0
5621
560
47k
0.5
1
RD1/4PU J
RD1/4PU J
RN2H K
RS1P K
56 x 101
47 x103
R50
1R0
561
473
5.62k RN1/4PC F562 x 1015621
CONTRAST TABLE
Part No.
Ref. No. Mark Symbol and Description VSX-908RDS-G VSA-E07 VSA-E07 Remarks
/HY /HY /HV
PCB ASSEMBLIES
NSP MAIN ASSY AWK7528 AWK7508 AWK7508
P5- 5 MAIN CONTROLASSY AWX7410 AWX7340 AWX7340
P5-12 VIDEO ASSY AWX7422 AWX7419 AWX7419
P5-13 S-VIDEO ASSY AWX7395 AWX7308 AWX7308
P5-16 DIGITAL-I/O ASSY AWX7396 AWX7315 AWX7315
NSP COMPLEX ASSY AWK7529 AWK7509 AWK7556
P5- 2 EXTERNAL IN (EXTRA-5.1)ASSY AWX7413 AWX7348 AWX7348
P5- 3 A-PINJACK ASSY AWX7412 AWX7346 AWX7346
P5- 4 CONNECTION ASSY AWX7347 AWX7558 AWX7558
P5- 9 REGULATOR ASSY AWX7310 AWX7559 AWX7559
P5-11 TRANS 2-2 ASSY AWX7518 AWX7470 AWX7470
P5-15 PRIMARYASSY AWX7345 AWX7345 AWX7454
NSP FRONT/VAMP ASSY AWK7530 AWK7511 AWK7511
P5-19 V-AMPASSY AWX7309 AWX7514 AWX7514
P8- 2 DISPLAY ASSY AWX7414 AWX7361 AWX7361
P8- 3 NSP ROTARY ENCODER ASSY AWX7405 AWX7328 AWX7328
VOLUME ASSY Not used AWX7367 AWX7367 No. 1
PACKING SECTION
P3- 1 AM Loop Antenna ATB7009 Not used Not used
P3- 2 FM Wire Antenna ADH7010 Not used Not used
P3- 3 Operating Instructions (English) ARB7187 ARB7189 ARB7189
P3- 4 Remote Control Unit (CU-VSX165) AXD7236 Not used Not used
P3- 4 Remote Control Unit (CU-VSA032) Not used AXD7217 *1 AXD7217 *1
P3- 9 Packing Case AHD7815 AHD7813 AHD7813
P3-14 Operating Instructions (German) ARC7244 ARC7271 Not used
P3-15 Operating Instructions (French) ARC7245 ARC7247 Not used
P3-16 Operating Instructions (Italian) ARC7246 ARC7248 Not used
P3-17 Operating Instructions (Dutch) ARC7270 ARC7249 Not used
P3-18 Operating Instructions (Swedish) ARC7280 ARC7283 Not used
P3-19 Operating Instructions (Spanish) ARC7281 ARC7284 Not used
P3-20 Operating Instructions (Portuguese) ARC7282 ARC7285 Not used
Remo-con. Cushion Not used AXG7080 AXG7080 Accessories
VSA-E07/HY, HV and VSX-908RDS-G/HY are constructed the same except for the following :
*1 : Refer to “4. REMOTE CONTROL UNIT”.

VSA-E07
3
Part No.
Ref. No. Mark Symbol and Description VSX-908RDS-G VSA-E07 VSA-E07 Remarks
/HY /HY /HV
EXTERIOR SECTION
P5-20 AC Power Cord ADG7029 ADG7029 VDG1063
P5-22 FM/AM TUNER Unit AXX7048 Not used Not used
P5-26 AC Cord Spacer ANG1153 ANG1153 Not used
P5-26 Cord Stopper Not used Not used CM-22B
P5-27 Bonnet Case AZN7809 Not used Not used
P5-31 Lead Card 13PAD (J16) ADD7169 Not used Not used
P5-37 Assy Holder ANG7121 ANG7139 ANG7139
P5-39 Card Spacer AEC7133 Not used Not used
P5-43 NSP Frame ANG7238 ANG7243 ANG7243
P5-48 NSP Panel Stay AND7031 AND7032 AND7032
P5-54 Rear Panel ANC7866 ANC7771 ANC7819
P5-55 Shield Case ANK7054 ANK7055 ANK7055
P5-58 Side Escutheon L AAK7662 AAK7639 AAK7639
P5-59 Side Escutheon R AAK7663 AAK7640 AAK7640
P5-64 NSP Under Base ANA7089 ANA7091 ANA7091
P5-72 Screw BBT30P100FCC IBZ30P100FCC IBZ30P100FCC
P5-73 Screw FBT40P080FNI Not used Not used
P5-78 AC Socket 3P AKP-502 AKP-502 Not used
P5-79 Caution Label ARW7036 ARW7036 Not used
P5-80 Fuse Holder Not used Not used VKR1003
P5-81 Fuse (T5A) Not used Not used PEK1003
P5-83 NSP Spacer AEB1254 Not used Not used
Side Panel L D10 Not used AAH7021 AAH7021 No. 2
Side Panel R D10 Not used AAH7022 AAH7022 No. 3
Side Plate L D10 Not used AAH7048 AAH7048 No. 4
Side Plate R D10 Not used AAH7049 AAH7049 No. 5
Top PlateAssy E07 Not used AAH7062 AAH7062 No. 6
Washer T Not used ABE7005 ABE7005 No. 7
Washer S Not used ABE7006 ABE7006 No. 8
S.Cushion Not used AEB7178 AEB7178 No. 9
Spacer V Not used AEB7179 AEB7179 No. 10
Spacer P Not used AEB7180 AEB7180 No. 11
Side Sheet D10 Not used AEC7230 AEC7230 No. 12
NSP PC Support Not used AEC7237 AEC7237 No. 13
Sheet Not used AED7035 AED7035 No. 14
Rubber Not used AEZ7002 AEZ7002 No. 15
NSP Side Panel Sheet Not used AMR7284 AMR7284 No. 16
Screw Not used BBT30P060FZK BBT30P060FZK No. 17
SH Screw Not used PBA1049 PBA1049 No. 18
Washer Not used VEC1254 VEC1254 No. 19
HEAT SINK SECTION
P7- 9 NSP Heat Sink ANH7102 ANH7103 ANH7103
FRONT PANEL SECTION
P8-10 Door Sheet AAH7057 AAH7050 AAH7050
P8-14 MR Button AAD7575 Not used Not used
P8-21 Sub Panel ANB7207 ANB7163 ANB7163
P8-25 Front Panel ANB7176 ANB7219 ANB7219
P8-30 Volume Knob AAB7210 AAB7211 AAB7211
P8-38 Panel Base AMB7572 AMB7573 AMB7573
Function Lens Not used AAK7628 AAK7628 No. 20
Lead Card 8PAD (J19) Not used ADD7168 ADD7168 No. 21
Notes : ÷The numbers in the remarks column correspond to the numbers on the “ EXPLODED VIEWS ”.
÷For PCB ASSEMBLIES, Refer to “CONTRAST OF PCBASSEMBLIES”, “2. PCB CONNECTION DIAGRAM” and “3. SCHE-
MATIC DIAGRAM”.

VSA-E07
4
EXPLODED VIEWS
÷EXTERIOR SECTION
C
SP/PS Assy
Screw
IBZ30P100FCC
Panel Stay
MAIN
CONTROL
Assy
REGULATOR
Assy
DSP Assy
EXTRA-5.1
Assy
A-PINJACK
Assy
Shield Case
10
Screw
BBZ30P080FZK
1
5
4
FRONT PANEL SECTION
12
Side Escutheon L
17
7
19
13 Remo-Con.
Cushion
Remo-Con.
Cushion
11
PRIMARY Assy
Under Base
9
14
18
2
3
18
815
16
8
16
8
18
6
Screw
BBT30P080FCC
17
Side Escutheon R
12

VSA-E07
5
C
20
21
DISPLAY Assy
Panel Base
CONTRAST OF PCB ASSEMBLIES
AWX7348 and AWX7413 are constructed the same except for the following :
EXTERNAL IN (EXTRA-5.1) ASSY
F
A
Mark Symbol and Description Part No. Remarks
AWX7413 AWX7348
JA1101–JA1103 2P PIN JACK AKB7095 AKB7121
AWX7346 and AWX7412 are constructed the same except for the following :
A-PINJACK ASSY
F
B
Mark Symbol and Description Part No. Remarks
AWX7412 AWX7346
JA1011–JA1013 4P PIN JACK AKB7048 AKB7108
JA1015 4P PIN JACK AKB7048 Not used
1016 2P PIN JACK AKB7210 Not used
CN1014 6P PIN JACK (For JA1015 and 1016) Not used AKB7119
÷FRONT PANEL SECTION
AWX7558 and AWX7347 are constructed the same except for the following :
CONNECTION ASSY
F
C
Mark Symbol and Description Part No. Remarks
AWX7347 AWX7558
IC1301–IC1303 NJM4558D-D UPC4570C
AWX7514 and AWX7309 are constructed the same except for the following :
V-AMP ASSY
F
E
Mark Symbol and Description Part No. Remarks
AWX7309 AWX7514
C513, C533, C553, C613, C633 CEAT470M50 CECA470M50
C7507, C7508, C7527, C7528 Not used CEAT1R0M50

VSA-E07
6
AWX7340 and AWX7410 are constructed the same except for the following :
MAIN CONTROL ASSY
F
D
Mark Symbol and Description Part No. Remarks
AWX7410 AWX7340
IC103, IC105 NJM4558MD UPC4570G2
Q991 2SC1740S Not used
Q992 2SC2412K Not used
D991 1SS355 Not used
D995 UDZ11B Not used
C109, C110 Not used CCSQCH221J50
C991 CEAT101M16 Not used
C992 CKSQYF225Z16 Not used
C995 CKSQYB103K50 Not used
R143, R144 Not used RS1/10S331J
R921 RS1/10S103J Not used
R922 Not used RS1/10S103J
R975, R976, R978, R980–R983 RS1/10S102J Not used
R991 RS1/10S471J Not used
R992 RS1/10S221J Not used
R993 RS1/10S101J Not used
R994 RS1/10S472J Not used
R996 RS1/10S0R0J Not used
CN902 13P FFC CONNECTOR 52044-1345 Not used
CN941 4P PIN JACK AKB7015 Not used
JA911 2P PIN JACK DKB1045 Not used
113 6P PIN JACK AKB7089 Not used
JA901, JA911 4P PIN JACK Not used AKB7075
103 6P PIN JACK (For 113) Not used AKB7088
NSP J101 Not used DB916NS0
J102 Not used DB216NS0
AWX7559 and AWX7310 are constructed the same except for the following :
REGULATOR ASSY
F
M
Mark Symbol and Description Part No. Remarks
AWX7310 AWX7559
IC5003 NJM78M12FA Not used
D5009 D3SBA20(B) LN4SB60-4003
C5007 CEAT472M16 CEAT103M16
C5012 CKCYF103Z50 Not used
C5013 CEAT101M25 Not used
C5019, C5021, C5023 CEAT101M10 CEAT221M10
C5029 Not used CEAT221M50
C5030 (1µF/100V) Not used ACH1237
AWX7470 and AWX7518 are constructed the same except for the following :
TRANS 2-2 ASSY
F
O
Mark Symbol and Description Part No. Remarks
AWX7518 AWX7470
IC5501 AEK7018 (4A) AEK7019 (5A)
C5501 CEANPR47M50 ACH1237 (1µF/100V)
R5501 RFA1/4PS100J RFA1/4PS220J
R5502 RD1/4PU104J Not used

VSA-E07
7
AWX7419 and AWX7422 are constructed the same except for the following :
VIDEO ASSY
F
P
Mark Symbol and Description Part No. Remarks
AWX7422 AWX7419
702, 705 2P RCA PIN JACK AKB7017 AKB7076
706 2P RCA PIN JACK AKB7017 Not used
707 1P RCA PIN JACK AKB7020 Not used
JA701 3P PIN JACK (For 706 and 707) Not used AKB7109
AWX7308 and AWX7395 are constructed the same except for the following :
S-VIDEO ASSY
F
Q
Mark Symbol and Description Part No. Remarks
AWX7395 AWX7308
CN801 4P MINI DIN SOCKET AKP7043 Not used
CN802, CN803 4P MINI DIN SOCKET AKP7020 AKP7023
JA801 4P MINI DIN SOCKET (For CN801) Not used AKP7049
AWX7361 and AWX7414 are constructed the same except for the following :
DISPLAY ASSY
F
S
Mark Symbol and Description Part No. Remarks
AWX7414 AWX7361
IC7071 Not used M66311FP
IC7401 BU1923 Not used
Q7002 DTC124EK Not used
Q7401 2SA1993 Not used
Q7402 DTC143ES Not used
Q7403 2SC1740S Not used
D7002 SLR-343VR Not used
D7071–D7079 Not used SLR-343VR(MNP)
L7401 LFA2R2J Not used
S7022, S7024–S7028, S7030 VSG1009 Not used
C7011, C7073, C7074 Not used CKSQYB102K50
C7071 Not used CEAL101M6R3
C7072 Not used CKSQYB473K50
C7401 CKSQYB472K50 Not used
C7402 CEAT2R2M50 Not used
C7091, C7403, C7404 CKSQYB102K50 Not used
C7405 CEAT101M10 Not used
C7406, C7407 CCSQCH270J50 Not used
C7408 CKSQYB561K50 Not used
C7409 CEAT1R0M50 Not used
R7038 RS1/10S271J Not used
R7047, R7048 RS1/10S223J Not used
R7071–R7079 Not used RS1/10S271J
R7080–R7083 Not used RS1/10S102J
R7092 Not used RS1/10S473J
R7401, S7407, S7408 RS1/10S102J Not used
R7403 RS1/10S222J Not used
R7404 RS1/10S473J Not used
R7405 RS1/10S333J Not used
R7406 RS1/10S104J Not used
CN7003 Not used 52045-0845
X7401 CRYSTAL RESONATOR (4.332MHz) ASS7004 Not used
PCB BINDER Not used VEF1040

VSA-E07
8
PCB PARTS LIST
Mark No. Description Part No.
VOLUME ASSY
SEMICONDUCTORS
Q7301, Q7302 2SA1993
Q7303, Q7304 2SC5395
D7301 1SR154-400
CAPACITORS
C7301 CEANP100M16
C7302 CEAT220M50
C7303 CEAT471M6R3
RESISTORS
VR7301 (VARIABLE WITH MOTOR) ACX7037
Other Resistors RS1/10S J
OTHERS
CN7301 8P FFC CONNECTOR 52045-0845
KN7301 EARTH METAL FITTING VNF1084
F
Z
AWX7328 and AWX7405 are constructed the same except for the following :
ROTARY ENCODER ASSY
F
T
Mark Symbol and Description Part No. Remarks
AWX7405 AWX7328
C7103, C7104 CKSQYB103K50 Not used
R7103, R7104 RS1/10S103J Not used
S7101 ASX7004 Not used
AWX7454 and AWX7345 are constructed the same except for the following :
PRIMARY ASSY
F
V
Mark Symbol and Description Part No. Remarks
AWX7345 AWX7454
Y6003 AWG18 BOARD IN ADX7321 Not used
Y6004 AWG18 BOARD IN ADX7320 Not used
Y6005 AWG18 BOARD IN ADX7319 Not used
AWX7315 and AWX7396 are constructed the same except for the following :
DIGITAL I/O ASSY
F
W
Mark Symbol and Description Part No. Remarks
AWX7396 AWX7315
JA1204 2P PIN JACK AKB7095 AKB7121

VSA-E07
9
A
B
C
D
1234
1234
F
Z
2. PCB CONNECTION DIAGRAM
2.1 VOLUME ASSY
Q7304Q7301
Q7503
Q7502
VR7301
(ANP7010-C) (ANP7010-C)
CN7003
S
VOLUME ASSY
Z
VOLUME ASSY
F
Z
F
SIDE A SIDE B

VSA-E07
10
A
B
C
D
1234
1234
1SS355
1SS355
D
2/3
D
2/3
S
F
CN7005
CN906
52045-0545
CN1353
C
CN101
JA901 (1/2)JA901 (2/2)
JA901 : AKB7075
JA911 : AKB7075
DB916NS0
DB216NS0
JA911 (1/2)JA911 (2/2)
P
PLD
CD
T2
TU
V2
CD CD
T2
TU
T2 TU
T2
V1
MD
TV
LD TV
V2
V1
MD
: The power supply is shown
with the marked box.
TU
3. SCHEMATIC DIAGRAM
1/3F
D
3.1 MAIN CONTROL ASSY (1/3)

VSA-E07
11
A
B
C
D
5678
5678
1/2
2/2
1/3 F
MAIN CONTROL ASSY
(AWX7340)
D
CN5004 CN1302
CN103
CN104
C
UPC4570G2
UPC4570G2
UPC4570G2
UPC4570G2
M
F
: AUDIO SIGNAL ROUTE (LD)
LD
: AUDIO SIGNAL ROUTE
: AUDIO SIGNAL ROUTE (TV)
TV
: AUDIO SIGNAL ROUTE (VCR1)
V1
: AUDIO SIGNAL ROUTE (VCR2)
V2
: AUDIO SIGNAL ROUTE (MD)
MD
: AUDIO SIGNAL ROUTE (PHONO)
P
: AUDIO SIGNAL ROUTE (TUNER)
TU
: AUDIO SIGNAL ROUTE (CD)
CD
: AUDIO SIGNAL ROUTE (TAPE2)
T2
Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST"
1/3F
D

VSA-E07
12
A
B
C
D
1234
1234
D905-D908
1SS355
1SS355
D901-D904
1SS355
D
2/3
Y
4/5
M
F
M
F
CN9551
CN903
CN920
CN901
CN5008CN5005
3/3F
D
3.2 MAIN CONTROL ASSY (3/3)

VSA-E07
13
A
B
C
D
5678
5678
3/3 F
MAIN CONTROL ASSY
(AWX7340)
D
S
F
CN904
CN7001
CN905
CN108
CN701
P
CN5003
M
F
: The power supply is shown with the marked box.
3/3F
D

VSA-E07
14
A
B
C
D
1234
1234
3.3 V-AMP ASSY (1/2)
1/2 F
V-AMP ASSY
(AWX7514)
E
IC7601 (1/2)
UPC4570G2
IC7501 (1/2)
UPC4570G2
IC7541 (1/2)
UPC4570G2
IC7521 (1/2)
UPC4570G2
IC7621 (1/2)
UPC4570G2
D
2/3
E
2/2
CN105
505, 506
VEF1040
CN501
E
2/2
1/2F
E

VSA-E07
15
A
B
C
D
5678
5678
IC7601 (2/2)
UPC4570G2
IC7501 (2/2)
UPC4570G2
IC7541 (2/2)
UPC4570G2
IC7521 (2/2)
UPC4570G2
IC7621 (2/2)
UPC4570G2
E
2/2
: AUDIO SIGNAL ROUTE
1/2F
E

VSA-E07
16
A
B
C
D
1234
1234
D5010
1SS133
MTZJ10CMTZJ5.1B
TRANS 1 ASSY
(AWX7316)
TRANS 2-2 ASSY
(AWX7470)
POWER TRANSFORMER
3004
CN5001
CN5002
5501
5009
52147-0810
L
V
J
CN3003
L
N
LN4SB60-4003
C5501
R5501
C5501
ACH1237
NP 1/100
R5501 22
C5502
ACH1237 NP 1/100
C5030
ACH1237
NP 1/100
REGULATOR ASSY (AWX7559)
F
M
F
O
CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE.
REPLACE ONLY WITH SAME TYPE NO. 491.200 MFD, BY
LITTELFUSE INC. FOR IC5009, IC5010 (AEK7023).
CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE.
REPLACE ONLY WITH SAME TYPE NO. 491005 MFD, BY
LITTELFUSE INC. FOR IC5501 (AEK7019).
3.4 REGULATOR, TRANS 1 and TRANS 2-2 ASSYS
N
F
O
F
M

VSA-E07
17
A
B
C
D
5678
5678
CN5006 CN5007
CN5005
CN5008
CN5004
CN5003
CN108
D
3/3 F
CN104
D
1/3 F
CN901
D
3/3 F
CN920
D
3/3 F
CN9801
Y
2/5
CN9802
Y
2/5
: AUDIO SIGNAL ROUTE
F
M

VSA-E07
18
A
B
C
D
1234
1234
3.5 H. PHONE/F. VIDEO, DISPLAY, ROTARY ENCODER and VOLUME ASSYS
R
H. PHONE/F. VIDEO ASSY
(AWX7342)
DISPLAY ASSY
(AWX7361)
CN7201 CN7004
CN7005
S7001 : STANDARD
S7002 : STEREO
S7003 : DSP MODE
S7004 : ADVANCED
S7005 : THX CINEMA
S7006 : STAND BY/ON
S7007 : EXTERNAL
DECODER IN
S7008 : SPEAKERS
S7009 : DIRECT
S7010 : BASS –
S7011 : LOUDNESS
S7012 : BASS +
S7013 : MIDNIGHT
S7014 : TREBLE –
S7015 : DIGITAL NR
S7016 : TREBLE +
S7017 : SIGNAL SELECT
S7018 : INPUT ATT
S7019 : MPX
S7020 : TAPE2 MONITOR
S7021 : LEVEL –
S7023 : LEVEL +
S7029 : FL DIMMER
M663111FP
CN906
D
1/3 F
R
F
S
F
S

VSA-E07
19
A
B
C
D
5678
5678
ROTARY ENCODER ASSY
(AWX7328)
VOLUME ASSY (AWX7367)
CN7003 CN7301
CN7002 CN7101
CN7001
2SA1037K
CN904
D
3/3 F
F
T
F
Z
F
Z
F
T
F
S

VSA-E07
20
13
1
17
16
15
18
19
18
19
32
31
29
56
2
8
9
12
29
39
25
27
29
29
29
23
22
22
20
35
21
24
29 30
26
38
37
36
11
10
33
7
34
14
4. REMOTE CONTROL UNIT [AXD7217(CU-VSA032)]
4.1 EXPLODED VIEWS AND PARTS LIST
NOTES: •Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
•The 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 the product are used for disassembly.