Philips MCD 906 User manual

609DCMmetsySorciMDVD
TABLE OF CONTENTS
3141 785 33011
DB 0946
2008
Location of PC Boards .................................................... 1-1
Specification ................................................................. 1-2
Measurement Setup ....................................................... 1-3
Service Aids ................................................................... 1-4
Instruction On CD Playability .................................1-5 to 1-6
Software Version Check & Upgrade .............................. 2-1
Malfuction Check Chart .................................................. 2-2
Decoder Board ...................................................................11
Disassembly Diagram ...................................................3-1
Block Diagram ................................................................. 4-1
Wiring Diagram................................................................. 4-2
VFD Display Board .............................................................5
Circuit diagram ........................................................... 5-1
Layout diagram ........................................................... 5-2
Prepositive Board ................................................................6
Circuit diagram ........................................................... 6-1
Layout diagram ........................................................... 6-2
AMP Board ..........................................................................7
Headphone,Button&AUX Board Diagram ..........................8
Circuit diagram ........................................................... 7-1
Layout diagram ........................................................... 7-2
TUNER Board ...................................................................10
Circuit diagram ......................................................... 10-1
Layout diagram ......................................................... 10-2
Circuit diagram ..............................................11-1 to 11-8
Layout diagram ............................................11-9 to 11-10
LAMP Board ....................................................................... 9
Explode View ................................................................12-1
Service Partlist ................................................... 13-1 to 13-3
Version 1.1

Location of PC Boards
1-1
VERSION VARIATIONS:
Type /Versions:
Features
Board in used:
MCD906
Service policy
BUTTON BOARD
AMP BOARD
LAMP BOARD
HEADPHONE BOARD
PREPOSITIVE BOARD
DISPLAY BOARD
AXU BOARD
TUNER BOARD
DECODER BOARD
* TIPS : C -- Component Lever Repair.
M -- Module Lever Repair
-- Used
/55
/55
/58
/58
/61
/61
/79
/79
/93
/93
/94
/94
/96
/96
/98
/98
/37
/37
/12
/12
/05
/05
Feature diffrence
RDS
TDS
VOLTAGE SELECTOR
ECO STANDBY - DARK
M
M
M
M
M
M
M
M
M
M
MM
Type /Versions:
MCD906
TUNER BOARD
PREPOSITIVE BOARDDISPLAY BOARD
HEADPHONE BOARD DECODER BOARD
AUX BOARD
AMP BOARD
SCART BOARD
(12/05version)
ECO POWER BOARD
(12/05version)
VOLTAGE SELECTOR BOARD
(98version)
LAMP BOARD
BUTTON BOARD
M
M
M
M
M
M

AMPLIFIER
Rated Output Power ........................ ..2 x 75W RMS
Signal-to-noise ratio ................................. 65 dBA
Frequency response ......... 40Hz + 3dB+/-3 20KHz
Aux Input ......................................0.5V RMS 47kohm
DISC
Laser Type .......................................... Semiconductor
Disc Diameter ............................................ 12cm/8cm
Support Disc ......................................................DVD,
DVD-R,DVD-RW,DVD+RW,CD-DA,MP3,CD-RW
Audio DAC ....................................... 24Bits / 44.1kHz
Total Harmonic Distortion ..................... <0.5%(1kHz)
Frequency Response ..........40Hz + 0.5dB+/-2 20KHz
S/N Ration .................................................... GBA
TUNER
FM Tuning Range ............................. 87.5 – 108 MHz
Tuning grid ............................................100K/50KHz
Sensitivity
– Mono, 50dB S/N Ratio ..................................... 5u V
– Stereo, 50dB S/N Ratio ................................ 100uV
Selectivity ........................................................ >28dB
Image Rejection .............................................. >25dB
Total Harmonic Distortion ................................... <1%
Signal to Noise Ration .................................. >65dBA
SPEAKERS
Speaker Impedance ................................................ 4ohm
Speaker Driver, base ................................................5 1/4"
Speaker Driver, tweeter ....................................BUZZER
Frequency Response ...................40Hz + 3dB+/-3 20KHz
GENERAL INFORMATION
Total Output power ..................................... 150WRMS
AC Power ..................................... 220-230 V / 50Hz/60Hz
Operation Power Consumption ................................. 85W
Standby Power Consumption ..................................... <4W
Eco Standby Power Consumption ..............................<1W
Headphone Output ................................ 2X15mW 32ohm
USB Direct ...................................................... Version 1.1
Dimensions
– Main unit (w x h x d) ............................275x126x250mm
– Speaker box (w x h x d) ....................186x300x222.5mm
Weight
–With Packing ................................................... 16.5 KG
–Main Unit .............................................................. 5.0KG
–Speaker box .................................................... . 4.5x2KG
Specifications and external appearance are
subject to change without notice.
1-2
Specification

1-3
LF Generator
e.g. PM5110
Recorder
Use Universal Test Cassette CrO2 SBC419 4822 397 30069
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion met
e
e.g. Sound Technology ST170
L
R
DUT
or Universal Test Cassette Fe SBC420 4822 397 30071
LEVEL METER
e.g. Sennheiser UPM550
with FF
-
filter
S/N and distortion meter
e.g. Sound Technology ST1700B
L
R
DUT
CD
Use Audio Signal Disc
(replaces test disc 3)
SBC429 4822 397 30184
Bandpass
250Hz-15kHz
e.g. 7122 707 48001
LF Voltmeter
e.g. PM2534
DUT
S/N and distortion meter
e.g. Sound Technology ST1700B
Frame aerial
e.g. 7122 707 89001
Tuner AM (MW,LW)
To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday´s cage.
Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).
RF Generator
e.g. PM5326
Ri=50:
Bandpass
250Hz-15kHz
e.g. 7122 707 48001
LF Voltmeter
e.g. PM2534
DUT
RF Generator
e.g. PM5326
S/N and distortion meter
e.g. Sound Technology ST1700B
Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).
Ri=50:
Tuner FM
MEASUREMENT SETUP

1-4
SERVICE AIDS
GB WARNING
All ICs and many other semi-conductors are
susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life
drastically.
When repairing, make sure that you are
connected with the same potential as the mass
of the set via a wrist wrap with resistance.
Keep components and tools also at this
potential.
ESD
CLASS 1
LASER PRODUCT
GB
Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified,
be used
Safety components are marked by the symbol !.
Lead free

Set remains closed!
N
Y
Play a CD
for at least 10 minutes
Y
playability
ok ?
N
playability
ok ?
add Info for customer
"SET OK"
check playability
N
Y
playability
ok ?
check playability
check playability
return set
Customer complaint
"CD related problem"
"fast" lens cleaning
1
2
3For flap loaders (= access to CD drive possible)
cleaning method 4is recommended
INSTRUCTIONS ON CD PLAYABILITY
1-
Exchange CDM
1-4For description - see following pages

1
PLAYABILITY CHECK
For sets which are compatible with CD-RW discs
use CD-RW Printed Audio Disc ....................7104 099 96611
TR 3 (Fingerprint)
TR 8 (600μ Black dot) maximum at 01:00
• playback of these two tracks without audible disturbance
playing time for: Fingerprint t10seconds
Black dot from 00:50 to 01:10
• jump forward/backward (search) within a reasonable time
For all other sets
use CD-DA SBC 444A..................................4822 397 30245
TR 14 (600μ Black dot) maximum at 01:15
TR 19 (Fingerprint)
TR 10 (1000μ wedge)
• playback of all these tracks without audible disturbance
playing time for: 1000μ wedge t10seconds
Fingerprint t10seconds
Black dot from 01:05 to 01:25
• jump forward/backward (search) within a reasonable time
2
CUSTOMER INFORMATION
It is proposed to add an addendum sheet to the set which
informs the customer that the set has been checked
carefully - but no fault was found.
The problem was obviously caused by a scratched, dirty or
copy-protected CD. In case problems remain, the customer
is requested to contact the workshop directly.
The lens cleaning (method 3) should be mentioned in the
addendum sheet.
The final wording in national language as well as the printing
is under responsibility of the Regional Service Organizations.
4
LIQUID LENS CLEANING
Because the material of the lens is synthetic and coated
with a special anti-reflectivity layer, cleaning must be done
with a non-aggressive cleaning fluid. It is advised to use
“Cleaning Solvent
The actuator is a very precise mechanical component and
may not be damaged in order to guarantee its full function.
Clean the lens gently (don’t press too hard) with a soft and
clean cotton bud moistened with the special lens cleaner.
The direction of cleaning must be in the way as indicated in
the picture below.
Before touching the lens it is advised to clean the
surface of the lens by blowing clean air over it.
This to avoid that little particles make scratches on
the lens.
INSTRUCTIONS ON CD PLAYABILITY
1-

2-1
Software Version Check & Upgrade
MCD906 Vxx
Upgrade software
Software check
3.Press SYSTEM on the remote open menu, press Left or Right to select “Preference
Page”, TV screen showing as below:
Press Up or Down to select “Default” on remote, Press OK to exit reset.
Software upgrade finish.
Input password “811502” on remote, TV screen showing as below:
Upgrade File detected
--Preference Page--
TV type PAL
Audio CHI English
Subtitle CHI French
Disc menu CHI Spanish
Parental Chinese
Japanese
Default Korean
Russian
Tjai
Upgrade?
Press PLAY to start
Upgrading
CPU version check
1.Downloading the software form Philips support website
1.Keep press PLAY/PAUSE and STOP buttons,plug into the power cord at the same time,
TV showing as below:
2.Put in the Software CD Disc or USB,when it is loading,
the TV screen showing as below:
Waiting half to one minute,till the TV screen showing disappear.
Turnoff electrical source and reopen.
http://www.philips.com/support
Ver :
Date
Time
Region code
MCD906 / xxxx
mm dd yyyy
hh : mm : ss
x

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1
1
1
1
2
2
1
2
1
1
1
1
2
Disassembly Diagram
3-1 3-1
A,Loosen screws as below sketch map to
open the top cabinet:
1,screws:3x6BMTT(3PCS)
2,screws:3x6FMTT(2PCS)
E,Loosen screws as below sketch map to
remove the Decoder Board:
1,screws:3x10PA(3PCS)
2,screws:3x6BM(2PCS)
H,Loosen screws as below sketch map to
remove the USB Board:
1,screws:3x6PA(1PC)
I,Loosen screws as below sketch map to
remove the LAMP Board:
1,screws:2.6x4BB(2PCS)
F,Loosen screws as below sketch map to
remove the Prepositive Board:
1,screws:3x6PA(2PCS)
G,Loosen screws as below sketch map to
remove the Display Board:
1,screws:2.6x6BB(10PCS)
B,Loosen screws as below sketch map to
remove the both sides panels:
1,screws:3x6PA(6PCS)
2,screws:3x10PA(4PCS)
C,Loosen screws as below sketch map to
remove the DVD mechanism bracket:
1,screws:3x12BA(2PCS)
2,after loosed the screws, push the DVD mechanism
bracket breadthwise to remove it
D,Loosen screws as below sketch map to
remove AMP board:
1,screws:3x10PA(1PC)
2,screws:3x10PA(4PCS)
DVD mechanism bracket
Aluminium Top Cover

TDA8920
PT2314
9228
24C02
TUNER
BLOCK
IC:TEA5760
AUX2 AUX2 IN
AUX1 AUX1 IN
RED
ROUT
VIDEO
V-OUT
S-VIDEO S-V OUT
COAXIAL
OPTICAL
GREEN
GR OUT
BLUE
BOUT
MEPG2
BLOCK
MECHANISM
DVD
VFD
PT16311
REM
1
GND
2
Vcc
3
REM-SENSOR
CPU5V
CPU5V
CPU5V
DVD5V
AC
POWER
SWITCH POWER
STANDBY
POWER
CONTROL
SWITCH
7812
SELENIUM
SELENIUM
FILTER
FILTER
AMP
DVD
CPU5V
DVD5V AMC2576
DVD ON/OFF
DVD POWER
SWITCH
CONTROL
TUNER-RIN
AUX2 IN
AUX1 IN
D-FL D-FR
CPU
SDA
SCL
FR
FL
KEY
CONTROL
FR
FL
STANDBY
MUTE
+vs
-vs
+vs
-vs
D-FL
D-FR
12AX7
FR
FL
TL027
FR FL
+vs
-vs
SELENIUM
FILTER
FRONT
APW7080
+12V
FM+5V
TUNER-LIN
TUNER-RIN
TUNER-LIN
4-1 4-1
Block Diagram
IC201
VFD Display Board
U9
U13
IC1
U12
J13
Decoder Board

Wiring Diagram
4-24-2
VALVE LAMP BOARD-L VALVE LAMP BOARD-R
BUTTON BOARD
DISPLAY BOARD
USB BOARD
LAMP BOARD
LAMP BOARD
DECODER BOARD
AUX BOARD
AMP BOARD
PREPOSITIVE BOARD

VFD Display Board --Circuit Diagram
5-1 5-1
STB1
DATA
CLK
REM
RT-A
RT-B
+5V
V-GND
-28V
VF1
VF2
SW1
1
SW2
2
SW3
3
SW4
4
DOUT
5
DIN
6
IC
7
CLK
8
STB
9
KEY1
10
KEY2
11
KEY3
12
KEY4
13
Vdd 14
S1/KS1 15
S2/KS2 16
S3/KS3 17
S4/KS4 18
S5/KS5 19
S6/KS6 20
S7/KS7 21
S8/KS8 22
S9/KS9 23
S10/KS10 24
S11/KS11 25
S12/KS12 26
S13 27 S14 28 S15 29 S16 30
S17/G12 31 S18/G11 32
Vdd 33
VEE 34
S19/G10 35
S20/G9 36
G8 37 G7 38 G6 39
G5
40
G4
41
G3
42
G2
43
G1
44
Vdd
45
LED5
46
LED4(BBE)
47
LED3(POWER)
48
LED2(FANCT)
49
LED1(7507RST)
50
Vss
51
OSC
52
IC201
uPD16311
R209
47K
R214
33K
R215 33K R216 33K R217 33K
K4
K3
K2
K1
D201
4148
D203
4148
STB1
CLK
DATA
S1
S2
S3
S4
S5
S6
S7
S8
S9
KS1
KS2
-28V
+5V
S1
S2
C208
104
R202
4.7/0.5
REM
1
GND
2
Vcc
3
S201
REMOTE
S10
S11
S12
S13 S14 S15 S16 S17 G11 G10 G1 G2 G3 G4 G5 G6 G7 G8 G9
D202
4148
S3 KS3
R201
4.7/0.5
C201 104
C207
47uF
SW201
CH-
SW203
CH+
SW204
TU+/PREV
SW207
TU-/NEXT
SW202
STOP
SW205
MODE
SW206
OPEN/CLOCS
R211
10K
R212
4.7K
R213
10K
G
1
B
2
A
3
CORD201
CORD
C204
103
C203
103
RT-A
RT-B
R207
47
C206
47u
C205
104
R206
10
SW210
DSC
C202
104
SW212
PLAY
S4
P-EQ
S-BASS
1
2
3
4
5
6
7
8
9
10
11
CN201
11P
VF1
1
VF1
2
S1
3
S2
4
S3
5
S4
6
S5
7
S6
8
S7
9
S8
10
S9
11
S10
12
S11
13
S12
14
S13
15
S14
16
S15
17
S16
18
S17
19
G1
20
G7
21
G8
22
G9
23
G10
24
G11
25
G3
26
G2
27
G4
28
G5
29
G6
30
VF2
31
VF2
32
VFD201
MCD190VFD
G1 G2 G3 G4 G5 G6
G7 G8
G9
G10
G11
S1
S2 S3
S4 S5 S6 S7 S8
S9
S10 S11
S12 S13 S14 S15 S16
190-2
S17
LED
1
2
3
4
5
CN2
5P
K1
K4
KS1
LED++5V
R01 4.7K
LED

5-2 5-2
VFD Display Board--Layout Diagram

D7-10
IN4007X4
LIN
RIN
OUT GND IN
U1
LM7812
C2
2200u/25V
1
2
3
4
5
CN3
2.5/5P
180V~
0V~
~12V0
~12V
R50*
0.47/0.5W
2
2
3
3
11
4
4
5
5
Q1A
12AX7
7
7
8
8
66
9
9
Q1B
12AX7
R24*
47K/0.5W
R27*
47K/0.5W
R23*
10K0.5W
C5
223/100V
C6
100uF/350V
+VDD
R2*
0.47/0.5W
R22*
0.47/0.5W
D2
4001
D3 4001 C3
104
+12V
R58
330K/0.5W
C12
104 J/450V
+12V
R54
8.2K0.25W
R25
47K/ 0.25W
R56
3.3K/0.5W
C10
5P
R51
47K 0.25W
R60
150K/0.5W
R62
560 0.5W
R64
330K/0.5W
C14
1uF/450V
C16 1uF/250V
Q2A
12AX7
Q2B
12AX7
R59
330K/0.5W
C13
104 J/450V
+12V
R55
8.2K 0.25W
R28
47K/ 0.25W
R573.3K/0.5W
C11
5P
R61
150K/0.5W
R63
560 0.5W
R65
330K/0.5W
C15
1uF/450V
C17
1uF/250V
R52
47K 0.25W
GND
GND
+VCC
C9 100uF/400V
R31
1K
R37
680
R67
47K0.25W
R66
3.3K0.25W
R69
47K0.25W
R68
3.3K0.25W
OUT-L
OUT-R
OUT-L
OUT-R
LIN
RIN
R1
470K
Q3
9014
C1
330uF/16V
D1
4148
1 2 3 4
CN1
3P
+12V
GND
1
2
3
4
5
6
7
CN2
7P/2.0
GND
VCC
Q4
9014
Q6
B772
STANDBY R6
10K
R7
1K
COM
胆灯丝供电
STANDBY
R8
0
1
2
3
4
5
CN4
4P
1
2
3
4
5
CN5
USB
USB-
USB+
USB-V
LED1 LED2
R3
680
LED-
LED
1
2
CN8
2P
1
2
CN7
2P
+12V
LED
Prepositive Board -- Circuit Diagram
6-1 6-1

Prepositive Board--Layout Diagram
6-2 6-2

SL-OUT 1
2
3
4
CN300
4p/2.5
AGND
1
2
3
4
5
6
7
CN108
7P
16V-
16V+
+ AC AC -
BD102
406
F101
F2AL250V
C1501
3300u/25v
C1502
104
DGND
BD100
4001x4
R119
33K
R100
39
C1517
220u
C1515
104
Q104
8050
R120
4.7k
1
2
CN109
2P
AC12V
AC-12V
VCC+12V
ECO-Power
ECO_VCC
R1378
1K
Q1
9014
R1379
1K
Q2
8550
R1389
100
VCC+12V
STANDBY
1
2
3
CN110
3.95/3P
+ AC AC -
DB101
KBL1010G
C152
4700uF/35V
C151
4700uF/35V
~18V-1
~18V-2
F103F4AL250V
F102 F4AL250V
3C:6AL250V
3C:6AL250V
B-G
1
E-S 2
C-d
3
Q113
BUK7509-55A
Q115
BC857B
Q116
BC857B
R130
10k
R113
47K
R140
4.7K
R133
10k
-30V
R174
3.3K R129
10K
R171
680
Q117
BC847B
R132
10K
+30V
DZ102
BZX79-B27V
DZ103
BZX79-B27V
R173
3.3K
R172
680
B-G
1
E-S
2C-d 3
Q114
BUK7509-55A
-28V
+28V
C139
104
C140 104
C153
104M
C155
104M
C154
104M
R159
10K
R160
10k
C135
104j
C134
104j
STANDBY
AGND
FL IN
FR IN
MUTE
1
2
3
4
CN301
8P/2.0
AGND
FL IN
FR IN
DGND
1
2
3
4
5
6
7
CN107
7P
VF1
AC28V+
AC28V-
16V+
16V-
D108
4001
D102
4001
D109
4001
D107
4001
C121
220/50V
C122
220/50V
R151
10K
R150
10K
+30V
-30V
R162
2.2 1/4W
R163
2.2 1/4W
1
2
3
CN102
3P
VF1
VF2
-27V
1
2
3
4
5
CN1
5P
VCC+12V
STANDBY
ECO-Power
TO FAN
DGND
V_FAN
+12V
Q081
8050
R1393
1K
Q080
8550
1
2
CN090
2P
C1514
47/25
R083
4.7K
R084
4.7K
R082
22K
R1392
100
D081
4148
+12V
1 2 3
Vss
45
6 7
Vcc 8
-
+
-
+
IC1
TL072
C301
104
R331
15K R334
240K
R332
15K
C304
333
R336 2.2K
R335
2.2K
C308
474
C306
104p
C305
104p
C303
333
-28V
C307
474
C302
104
R333
240K
+28V
L-O
R-O
DZ2
12V
DZ1
12V
C1
47uF
C2
47uF
L-IN
R-IN
MUTE
R313 1.5K
Q300
BC817B
R303
2.2K
R300
4.7K
L303
JRH0349
L304
JRH0349
VSSA2
1
VDDA2
3
VSSD
24
STABL
18
PROT
13
SUB/VSSD
19
VDDP2
23
VSSP2
20
BOOT2 22
OUT2 21
OUT1 16
BOOT1 15
VSSP1 17
VDDP1 14
MODE 6
OSC 7
VSSA1 12
VDDA1 10
IN1+
8
IN1-
9
SGND1
11
SGND2
2
1N2+
5
IN2-
4
IC300
TDA8920BTH
C355
104
C356
104 C360
104
C374
104/100V
C361
104
C363
104 C364
104
VssA2 VddA2 Vddp2
C379
153
C383
684(M) C373
104
R312
22
C377
153
C382
684(M)
C362
104
R311
22
SR-OUT
C347
220P
C341
474
C339
474
R305
5.6K
R309
5.6K
L300
47uH
L301
47uH
C371
104
C370
104
C381
153
C392
224
C376
104/100V
C345
220P
R308
5.6K
R306
5.6K
C344
474
C342
474
C331
102
C332
102
C333
102 C335
102
C336
102
C330
102
C324
102
C326
102
C327
102
C329
102
R318
10
R317
10
C348
220P
C350
220P
C353
220P
C354
220P
Vddp2 Vssp2
Vssp2
Vddp2
C388
470uf/35v
C387
470uf/35v
C384
22uf/100V
C367
104
C368
104
R319
10
R320
10
+28V
-28V
C390
1000uf/35v
C389
1000uf/35v
Vssp2
R314
22K
R315
22K
R310
22
C359
104
R316
30k
R304
5.6K DZ300
5.1V
C338
100UF/16V
-28V
+28V
SPGND
SPGND
C300
10uF
SL-OUT SR-OUT
R338
X
R339
X
L-O
R-O
AGND
L-IN
R-IN
L-IN
R-IN
VF2
R175
560/0.5W C393
47UF/35V
DZ301
27V
-28
+28
1
2
CN111
2P
D110
4148
R340
100
R341
100
DZ302
5.1V
R342
15
+28V
+28V
C394
10uF/16V
Q301
9014
Q302
8550
R343
4.7K R345
1k
R344
47K
STANDBY
STANDBY
OUT
2
GND
1
IN
3
IC2
7805
C398
104
C397
104
C395
E47UF/25V
C396
100UF/16V
ECO+5V
ECO+5V
R346
4.7 1/2W
R347
22K
7-1 7-1
AMP Board --Circuit Diagram

7-2
7-2
AMP Board --Layout Diagram

8-1
8-1
Headphone, Button & AUX Board Diagram
HP-MUTE
GND
H-OUT L
H-OUT R
1
18
87
73
32
24
45
5
JACK801
PH-JACK
1
2
3
4
CN801
4P
Headphone Board Button Board
1
2
3
4
5
6
CN402
6P
1
2
3
4
5
6
CN401
AUX
GND
GND
AUX1L
AUX1R
AUX2L
AUX2R
R405
100
R403
100
R404 100
R402
100
R406
47K R407 47K
R400
47K R401 47K
AUX Board
SW211
SOURCE
SW208
STANDBY
1
2
3
4
5
CN1
5P
K1
K4
KS1
LED
LED1
LED+
35-MCD906-01A1

9-1
9-1
1
2
CN501
2P
LED501
LED
R501
680
1
2
CN601
2P
LED601
LED
R601
680
1
2
CN701
2P
LED701
LED
R701
680
LED702
LED
R702
680
VALVE LAMP BOARD-LLAMP BOARD VALVE LAMP BOARD-R
Lamp Board Diagram