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Manual abstract: user guide YORKVILLE EF500PSERVICE MANUAL
Detailed instructions for use are in the User's Guide.
[. . . ] SERVICE MANUAL ef500p
WEB ACCESS: http://www. yorkville. com
WORLD HEADQUARTERS CANADA Yorkville Sound
550 Granite Court Pickering, Ontario L1W-3Y8 CANADA Voice: (905) 837-8481 Fax: (905) 837-8746
MODEL TYPE: YS1002
U. S. A. Yorkville Sound Inc.
4625 Witmer Industrial Estate Niagara Falls, New York 14305 USA Voice: (716) 297-2920 Fax: (716) 297-3689
Quality and Innovation Since 1963
Printed in Canada
Manual-Service-ef500p-00-2v2 · November 11/2009
IMPORTANT SAFETY INSTRUCTIONS
This lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Ce symbole d'éclair avec tête de flèche dans un triangle équilatéral est prévu pour alerter l'utilisateur de la présence d'un « voltage dangereux » non-isolé à proximité de l'enceinte du produit qui pourrait être d'ampleur suffisante pour présenter un risque de choque électrique. The exclamation point within an equilatereal triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. [. . . ] REPLACE THE R128 AND C77 WITH THIS CIRCUIT R124 REPLACED WITH #4599, 22AWG SOLID
#4947 33K
LVGND1 +15V
8
-15V
4 R146 1/4W 10K
RAD
-15V
VNE5532N 4 NE5532N U27:C V+ U27:B 4148 1N753ARL D47 6V2 0W5 1/4W R158 56K
RAD
1/4W
1/4W
R148 47K
RAD
R149 33K
RAD
non-RoHS
V+
1/4W
LVGND2
1 2 U23:A
{Function} 3522 S3:B UP DOWN
8
R154 47K
RAD
MINI
*
1/4W R152 56K
.
1/4W
33U C89 16V
*
R156 15K
MINI
+15V
R155 1/4W 1M
RAD
RAD
16V C90 33U
U22:A
+15V
RAD
8
LIMITER SENSE
POWER L4 GRN MPSA06 R157 1/4W 3K3
RAD
+15V
TO92 5102 Q23
LVGND2
+15V
LVGND2
1/4W
R159 4K7
RAD
-15V
1/4W
LIMITER
U27:A NE5532N 63V C93 220N
Q22 5103 TO92
LVGND2
D62 4148
RAD
1/4W
LVGND2 WOOFCLIP
R162 1/4W 1K5
RAD
R165 100K
RAD
RAD
LEDGND LEDGND LVGND2
10K0 1/4W R167 R170 1/4W 10K0
MINI
MINI
R168 1/4W 220R
MINI
+24V
R171 1/4W 47K
RAD
R169 1/4W 6K8 R172 1/4W 1K0
MINI MINI
1/4W
BC560C R161 1M
1/4W
R164 1K5
RAD
R163 47K
-15V
4 U29:B U29:C V+ NE5532N
50V
22U C94
U28:B C95 100N NE5532N 100V C96 68N 100V
V-
IGND
R174 1/4W 562R
.
LVGND3
50V
22U C98
FLMP
1/4W
V-
MIC J4
50V C101 1N
MINI
4432 B 10K
4
NE5532N U28:C
IGND
50V C108 1N R181 1/8W 249R
FLMP
4K7 1/4W R177 75R R178 1/8W
FLMP
MINI
R179 30K
RAD
+15V
2K 1/4W R180
RAD
8
R173 1/8W 249R
-15V
16V C99 33U R175 1/4W 2K49
+15V
100N C119 100V 100N C120 50V 100N C121 100V 100N C122 100V 100N C123 100V 100N C124 100V 100N C125 100V
MIC_GAIN M P2:A 33U C97 16V
J109 2N5638
BC550C BC560C
2N5401 2N5551 MPSA06 MPSA13 MPSA43 MPSA56 MPSA63
BDX54B-54C BDX53B-53C
IRFP9040N IRFP23N50L
-15V
100N C131 100V 100N C132 50V 100N C133 100V 100N C134 100V 100N C135 100V 100N C136 100V 100N C137 100V
V+
U28:A
8
LVGND3
3925
50V
22U C107
R182 1/4W 562R
.
+15V
LVGND3
1/4W
1/4W
IGND
R185 2K49
MINI
MIC GAIN
LVGND1
D. N. S. 1/4W R183
RAD
LVGND3
LVGND4
LVGND1
LVGND2
LVGND
100V C114 D. N. S.
R184 1K
RAD
SILENT MIXER ON/OFF
R217 1/4W 18K
RAD
+15V
DSG TO-92
CBE TO-92
EBC TO-92
BCE TO-220
GDS TO-247 BD139 BD140 BD237 BD238 MJE270 MJE271 MJE340 MJE350
1N5250B 0W5 D13 20V0
2N5401 Q16 5108 TO92
LVGND3
MIXER SECTION
{Function} 1/4in JCK PCB MT VERT STER RT SWT J5 R189 1/4W 10K0
MINI
U29:A 1/4W
RAD
100V 4K7 R186
C117 D. N. S.
NE5532N
D63 D. N. S. 1/4W R215
RAD
K1:A R188 10K
RAD
LVGND3
1/4W
LVGND3
C127 47N R190 1/4W 1K0
MINI
R218 1/4W 1K0
LVGND4
MINI
4148 K1:B
100V P3:A BASS M R193 1/4W 4K7
RAD
3696 R194 1/4W 332R0
.
"STYLE_P25"
-15V
XC116
+15V
"STYLE_P32" M1159
1/4W
V+
NE5532N U32:C
1/4W
V-
R196 1/4W 10K0
MINI
IGND
50V C138 33P
RAD
LINE_GAIN M P4:A 4432 B 10K
{Function} 1/4in JCK PCB MT VERT STER RT SWT J6
U32:A
4
33U C128 16V 1K0 1/4W R199 1/8W
FLMP MINI
R195 1/4W 10K
RAD
NE5532N
MINI
1/4W
MINI
MINI
U33:C V-
220R 1/4W R206
16V
C139 33U
WIR
U33:B
22AWG
1/4W
R205 1/4W 10K0 RING
R207 10K0
75R R201
V+
NE5532N
RAD
R208 SOLID
R202 1K4
.
LINE GAIN
LVGND4
R209 1/4W 10K0
MINI
U33:A
NET00116 B
400V C140 2N2 P5:A M TREBLE
LVGND4
-15V
4
LVGND4 LVGND4 A
UP DOWN S5:B 3522 MIXER
NET00116
UP DOWN S5:A 3522 MIXER
8
R203 1/4W 1K0
-15V
LVGND4
10K 1/4W R200
RAD
BASS
R204 47K
MINI
C130 47P
100V
0. 1%
1/4W
50V C129 33P
MINI
RAD
RAD
8
R197 47K
50K B 4435
RING
R191 1/4W 10K0
16V
C126 33U
R160 1/4W 4K7
U32:B
R192 1/4W 4K7
ECB TO-126
NE5532N
R176 1K07
EF500P MODEL(S):REF FUNCTION OLD PART KNOB NEW PART KNOB
P1 P2 P3 P4 P5 R R R R R R R MAIN GAIN MIC GAIN BASS TONE LINE GAIN HORN TONE F F F F F F F 4537 4566 4546 4566 4537 O O O O O O O 8393 8392 8394 8392 8394 K K K K K K K 4434 4432 4435 4432 4434 N N N N N N N 9916 9915 9917 9915 9916 K K K K K K K
R198 1/4W 470K
MINI
+15V
Product
R211 1/4W 1K2
MINI
10K B 4434
IGND
R210 1/4W 1K2
MINI
TO MAIN INPUT
EF500P
PCB# M1159 Sheet 1 of 3
EF500P
TREBLE
Rev: 13V00 Date: Wed Nov 26, 2008 Filename: M1159V1300sch. sch2002
1/4W
RAD
NE5532N
1/4W
6858 NSL-32SR2
1/4W
R150 15K
V-
BAT85
U21:A R214 1/4W 470R
4148 R151 220R
CLIP L3 YEL D45 R153 1K5
U22:C
+44V
D
2. 0W
PHANTOM SUPPLY
+44V
HORN AMP
C92 3N3 100V
BC560C
R1 1/4W 22K
MINI
+44V
R2 1/4W 2K21
FLMP
G
N S
IRFP140N Q12 6931 TO247 IRFP140N
4U7 C3 63V 1/4W
R3 2K2
.
680P 1N5242B C1 D1 100V 12V0 0W5 R4 2. 0W 2K2
.
10U C2 63V
D2 D3 16V0 1N5246B 0W5 MR854 {Function} BDX53C Q2 6912 TO220
+22V
HORNGND
1/4W R10 4K7
RAD
R5 3K9
.
2N5551 Q4 5107 1N5254B D4 27V0 0W5 10U C7 63V TO92 R13 1/4W 2K2
MINI
R219 1/4W 470R
RAD
68U C4 25V C6 10P BC560C
1/4W
1/4W
1/4W
R7 R8 680R 10K
RAD RAD
R9 2K2
MINI
FUSIBLE
R6 1/4W 11R
BC550C Q3 5101 100N C5 100V
1. 0W
1/4W
+24V
D5
Q5 5102 TO92 2N5401 2N5638 Q9 5119 TO92 680P C8 100V 1/4W R21 18K
MINI
SILENT ON/OFF
LVGND
0W5 22V0 1N5251BRL
1/4W
4148 R20 1/4W 1M
RAD
1. 0W
2N5401 Q8 5108 TO92 C9
R16 2K2
MINI
SILENT
R19 1/4W 2K2
MINI
TO92
FROM INPUT PCB
_9 CIR WAFER W/LCK
1 0 9W1:A
D21
0. 1"
LVGND
HORNGND
1/4W
4148 R25 100K 1/4W
RAD
MJE340 Q11 6873 TO126 R24 2K2
MINI
1N5246B D11 12V0 0W5 10U C13 63V R26 1/4W 2K21
FLMP
0W5 16V0 D9 S
D10 MR854
-22V
1/4W
LVGND HORNGND +15V -15V +24V
W1:B 9 0 3 4 5 6 7 8 9
RAD
0 9W1:C 0 9W1:D
+120V
0 9W1:E 0 9W1:F 0 9W1:G 0 9W1:H 0 9W1:I 1/4W R32 22K
MINI
1/4W
R29 1K0
MINI
1/4W
R30 2K
MINI
+15V_MOD
+5V_MOD
100N C16 100V 6964
GND V+
220P C15 100V
MPSA92 U3:C Q13 5114 1/8W TO92 R33 1K5
FLMP
WOOFGND WOOFGND
GND1
-15V_MOD
C18 220P
V- V+
R34 1/4W 47K
MINI
STROBE
100N C17 100V 100V
1N750ARL D12 4V7 0W5
6
2
+
LM311 U1
OUT
8
7 6640
+15V_C
8
-
BAL
D14 4148 MC33078P MC33078P R36 1/8W 100R0
FLMP
WOOFGND
R35 1/8W 100R0
FLMP
5
4
1
3
+5V_MOD
WOOFGND
WOOFER AMP
D R37 1/4W 150R 0A2 BAT85 D15
MINI
V+
+15V
R38 1/8W 10R0
FLMP
7
5. 0W
14
+15V_MOD
R28 1/4W 4K7
MINI
+5V_MOD
+5V_MOD
R31 0R047
-44V
-15V_MOD +5V_MOD +5V_MOD +15V_MOD
1/4W LM311 U4
GND1 OUT
U2:C
U2:A
+15V_C
V-
GN S R39 1/4W 2R2
.
U2:B
STROBE
2
+
MINI
V- V+
1/4W
100N C21 100V
WOOFGND
-15V_C
4
IRFP23N50L Q14 6967 TO247
D. N. S. C19 100V
D
2
R27 100R
680P C14 100V
IRFP9140N Q1 6932 TO247 IRFP9140N
BROWN
63V C12 1U
1/4W
1/4W
RAD
10K R22
63V C11 2U2
0W5 12V0 D7 1N5242B
4U7 63V 4148 D6 15P C10 100V R23 1/4W 11R
HORNGND
FUSIBLE
{Function} BDX54C Q10 6911 TO220
YELLOW
Q7 5108
TP2
R17 0R47
FLMP
1. 0W
C144 10N
Q6 5102
R14 1/4W 18K TO92
RAD
R15 270R
RAD
TO92
FLMP
1. 0W
500V
TP1
R11 0R47
R12 0R47
FLMP
+
100V
R18 0R47
FLMP
C118 2N2
400V
3
18AWG HORN_POS
D8
R220 6R2
.
+
S1
#7401-DE-72P-8R 120W titanium
HORN
4 HORN_NEG 18AWG
G
P
HORNGND
3U3 C20 140V
R40 22K
8
6964
U3:A
6964
U3:B
+4V7_LS
13 12
6
BAL
+/-15V_C
100N C26 100V
74HC86N U5:D 11 6605 74HC86N U5:C D17 UF4004 1/2W R46 1R
SMALL
R41 1M
RAD
7 6640
WOOFGND
C28 470P
5
MINI
4
-15V_MOD
R42 1/4W 2K 100N C27 100V 0W5 4V7 D18 1N750ARL C29 10N
1
3
-
100N C24 100V
1U C25 63V
1N5248B D16 18V0 0W5
3U3 C51 250V
3U3 C22 140V L1
D. N. S. C23 100V
WOOFGND -15V_MOD WOOFGND
R43 1/4W 47R
MINI
-15V_C
-15V
MINI
WOOFGND
150N C32 63V MC33079P U6:E R54 1/4W 1K0
MINI
-15V_MOD
1/4W R49 4K7
MINI
5
U8:A
.
BLK
FLMP
6 6605
+4V7_LS
1/2W
R44 1/8W 10R0
100V
+5V_MOD
4
74HC86N U5:B
10 9 8 6605
288UH 3792 R48 270K D GN S IRFP23N50L Q15 6967 TO247 D. N. S. C30 100V 3U3 C31 140V
18AWG 5 NEG_OUTPUT
R45 1/4W 5K6
100V
5
+15V_MOD
4 R51 1/4W 6K8
MINI
R47 1/4W 1M
RAD
+15V_LS -120V
100N C33 100V R50 1/8W 75R
+
STROBE
1/4W
11
MINI
1/4W
R56 1/4W 6K8
V-
R55 1/4W 1K0
MINI
6
8
U6:A
.
2 U6:C R212 2K2
MINI
+
U6:B
U7 LM311
+4V7_LS +15V_MOD -120V
74HC86N U5:A 1 2 3 6605
R57 1M
RAD
RED
R52 1/4W 1K87
V+ V-
MC33079P
BAL
3 MC33079P
-
6640 7
V+
OUT
IR2110
D19 R53 1/4W 0A2 BAT85 6R2 .
FLMP
S2 WOOFER #7468 15" 8R 500WPGM NEO
4
GND1
1
6 POS_OUTPUT 1N5248B D20 18V0 0W5 5. 0W R58 0R047 74HC14N U9:C 5
IN OUT
-15V_MOD
100N C37 100V 1/4W R59 5K6
MINI
WOOFGND
68N C36 100V
C141 4N7 250V
6887
100N C34 100V
1U C35 63V
18AWG
1/4W
R213 15K
MINI
6 6603 74HC14N U9:E
PSGND
-15V_MOD
R221 1/4W 220R
MINI
1/8W
WOOFGND
R60 1K5
FLMP
-120V
11
IN
OUT
74HC14N U9:A
74HC14N U9:B 3
IN OUT
74HC14N U10:C
10 6603
+15V
1
IN
OUT
2 6603
4 6603 74HC14N U9:D
+4V7_LS
6 6603
OUT
IN
5
R65 1/4W 1K0
MINI
2N5551 Q17 5107 TO92 1/4W R66 1K0
MINI
74HC14N U9:F 13
IN OUT
12 6603
FROM POWER SUPPLY
PSGND
5. 0W
5. 0W
5. 0W
V+
+15V_MOD
R64 1/8W 10R0
FLMP
.
R69 12K
.
R67 12K
.
5. 0W
.
+5V_MOD
9 14
IN
14
R75 12K
R68 12K
OUT
100N C91 100V R105 5. 0W 12K
.
W2:B 0 680P C71 100V W2:C 0 W2:D 0 W2:E 0 W2:F 0 W2:G 0 W2:H 0
2 3 4 5 6 7 8
+22V -22V +44V -44V +120V -120V SILENT
+/-15V_MOD
7
1N5240BRL D22 10V0 0W5
100N C42 100V
V- V+
100N C41 100V
V-
1
+15V_LS
1/4W
W2:A 0
PSGND
8 6603
63V
R63 1K4
.
R62 1/4W 4K7
RAD
5N6 C39 100V
WOOFGND
U5:E
U9:G
7
470N C143
R166 1/4W 47K
MINI
3N3 C38 100V C142 100N 100V
74HC14N U10:B
WOOFGND
MPSA92 Q19 5114 100K 1/4W R72
RAD
2N5401 Q18 5108
-120V -120V
TO92
SILENT ON/OFF
2N5638 Q20 5119 TO92
3
IN
OUT
4 6603 74HC14N U10:D
+4V7_LS
100N C44 100V
LVGND
0W5 1N750ARL
D23 4V7
WOOFGND
1/4W 100N C43 100V
WOOFGND
9 TO92
IN
OUT
8 6603 74HC14N U10:F
-15V_MOD
R73 1/8W 10R0
FLMP
+4V7_LS
14
R70 1K4
.
WOOFGND
74HC14N U10:A 1 4148 D24 1/4W R76 3K16
0. 1%
V- V+
-15V
-120V
R71 1/4W 180K
MINI
13
IN
OUT
12 6603 74HC14N U10:E
IN
OUT
U10:G
2 6603
+4V7_LS
R77 1/4W 37K4
.
-15V_MOD
WOOFGND
11
IN
1/4W
R74 1K4
.
R78 0. 6W 18k7
SMALL
R223 0. 6W 18k7
SMALL
7
OUT
10 6603
+15V_MOD
-120V
R79 1/4W 1K0
MINI
-120V
U6:D
470P C45 100V
+4V7_LS
+15V +15V +5V_MOD
100N C50 100V 100N C53 100V 100N C52 100V 100N C58 PSGND 100V 100N C47 100V 100N C48 100V 100N C49 100V
+15V_MOD
R83 100R0
FLMP
MC33079P 470P WOOFGND C46 100V R80 1/4W 3K16
0. 1%
1/8W
+5V_MOD
U11 MC78L05ABPRM
IN OUT
100N C55 100V
100N C56 100V
100N C57 100V PSGND
100N C54 100V
{Function} GND 6728 {Watts} TO92
+5V_MOD
HEATSINK
HEATSINK
R81 1/4W 37K4
.
R82 1/4W 37K4
.
Product EF500P
PSGND
WOOFGND -15V -15V_MOD PSGND
EF500P
PCB# M1159 Sheet 2 of 3
Rev: 13V00 Date: Wed Nov 26, 2008 Filename: M1159V1300sch. sch2002
POWER SUPPLY
IEC_RECT #3645 SCH_DPDT #3585
18AWG BLK W25 SILENT 3682 VIO 114Vrms W6 D49 D50 4007 D52 W12 1N5402 RED W14 2487 R98 D55 FUSE 1N5402 +30V 2200U C105 50V 100V C109 100N 18AWG BLU W11
TO POWER AMP PCB
D48 MR752 D51 18AWG ORN W8 +59V D53 D54 1N5402 2200U C104 63V MR752
FUSE N. A. : #2415 F 5A CE: #2482 F3, 15A FAST BLOW
F1 FUSE 3682 BLK LIVE W9
SILENT
W7 18AWG YEL
+120V
+161V
N. A. :CH1255 CE: CH1255E
7 3682 BLK PRIMARY W10 42Vrms 3682 GRY 6 3682 21Vrms 5 8 L6 3682 YEL 4 W13
4007
+22V
IN
U30 MC7815CT
+44V
2700U C100 180V
1N5402
OUT
S4
22N C102 275V 6492 L5:A
680N C106 250V
{Function} GND 6872 {Watts} TO220
+15V
4U7 C103 63V
GROUND W26 GRN 3682 1. 0W
AC_GND
1300UH 4N7 C112 250V 100N C40 100V W21 NEUTRAL W27 GRN PSGND 18AWG WHT 3682 W20 PRIMARY BLK 3682 9
7. 0 AMP SLO-BLO T&R {C_Type} 2487 R61
18AWG GRN W15 PSGND
PSGND
CENTERTAP 3 W17 21Vrms RED 2 3682 W18 42Vrms 1 GRY 3682
D56 FUSE 1N5402 D58 1N5402
R187 1K8
7. 0 AMP SLO-BLO T&R {C_Type}
18AWG RED W19 -30V
100V 2200U C116 C111 100N 50V
TO220 6871 {Watts} GND {Function}
IN
4U7 C110 63V PSGND
D57 1N5402 2200U C115 63V 18AWG BRN -59V W22 D59 2700U C113 180V
CHASSIS GROUND MADE THROUGH16AWG 1/4" INPUT JACKS GRN
W16 INPUTGND
-22V
THERMAL BREAKER
MC7915CT U31
OUT
-15V
D60 1N5402
-44V
MR752 18AWG WHT
D61 W23 114Vrms VIO 3682 MR752
-120V
-161V W24
IGND
PSGND
M1159 MODEL(S):# 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 EF500P DATE VER# DESCRIPTION OF CHANGE AUG 22 2001 2. 00 1st RUN CHANGES FOR VER. 2. 00 D SEE ATTACHED NOTES ON P. C. B. V SEPT 18 2001 2. 00 CHANGE R28 FROM 10K TO 4K7 AND R34 FROM 33K TO 47K SEPT 20 2001 2. 10 PC#6453 R39 6R2 TO 2R2 OCT 22 2001 3. 00 REPOUR CHASSIS GROUND FOR CSA STANDARD 4mm CLEARANCE. D V ADD COPPER POURS UNDER ALL OUTPUT DEVICES. NOV 06 2001 3. 10 PC#6464 R37 75R TO 150R PC#6469 R130 4K7 TO 2K NOV 29 2001 4. 00 MOVED TRACES UNDER 1/4 JACKS #3921 &V4. 10 MOVE R24, ADD D21 AND C144, R27 FROM 47R TO 100R. D MAR/27/2002 V4. 10 CHANGE R208 3K TO JUMPER, R204 3K T0 47K, R206 1K TO 220R, C140 1N5 TO 2N2 D V AND C91 FROM 680P TO 100N. D V -INVERT BOTH AMP OUTPUT WIRE COLORS-INVERT BOX D V 1-APR-2002 4. 20 PC#6513 R130 2K TO R123 1K TO 470R 11-APR-2002 5. 00 PC#6523 UPDATE TABS, REMOVE COPPER UNDER XFMR 23-OCT-2003 6. 00 BOARD NOT USED FOR NX520P - REMOVE M1159A 19-FEB-2004 7. 00 PC#6671 P. S. OCT-07-2004 7. 10 PC#6694 CHANGE POTS TO P32 STYLE R145 4k7(#4982) . PC#6743 CHANGE C23, C19, C30 TO "DO NOT STUFF" OCT/15/2004 8. 00 UPDATE TABS FOR DS PCB'S R152 150k(#4839) SEP-13-2005 9. 00 PC#6964:INCREASE SPACING OF PADS AT POW. PC#6979:GT:R6&R23 #4815 12R->#2038 11R FUSIBLE C89 22u(#5631) OCT-31-2005 . PC7003:GT:R9 #4979 15K->#6104 2K2, ADD 8921 WASHER C77 PC7454 APR-27-2006 . PC#7098:GT:Q14&Q15 6914 IRFP350->6967 IRFP23N50LPBF D34 1N4148(#6825) AUG-16-2006 9. 01 HA, PC#7136, REPLACE R77, R81 AND R82 WITH #4686 . D43 1N4148(#6825) R128 1k(#4981) OCT-31-2006 10. 00 ROUTE TRACE FROM R22 TO R20 AROUND Q11 MOUNT PC# 7167, ENLARGE HOLE SIZE FOR #3522 . PC#7178, Updated limiter for RoHS compliance R124 1K0(6110) . PC#7245, CHANGE VCD PARTS VALUE, HEAD LIMITATION U15 (#6858) 28-MAY-2007 11. 00 FIX AUTO INSERT PROGRAM R127 2k2(#6104) 05-JUL-2007 12. 00 FIX AUTO INSERT PROGRAM U23 (#6858) 06-FEB-2008 13. 00 PC#7290, CE VERSION ONLY, REPLACE R157 10K #4940 . BA WILL PUT 33K, 470R, 100N AND 10U AS SHOWN, PAGE3 . PC#7398, ADD CROWBAR CIRCUIT AND CHANGE FUSE . AT THE SAME TIME SEE PRODUCTION NOTE
WITHOUT CROWBAR N. A. [. . . ] There are only about a dozen of each of these in each of our market territories. These failures at first sight will seem somewhat intimidating due to the blackening soot which is produced when the resistor arcs out to the printed high voltage rails under the resistor designated R60. The damage looks far worse than it really is and is generally repairable by anyone with basic electronics and soldering skills. The greatest difficulty with servicing class "D" amplifiers is that most service people have never serviced one before. [. . . ]
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