Sony HCD-EC55 / HCD-EC77 / HCD-GX99 Service Manual ▷ View online
13
13
HCD-EC55/EC77/GX99
HCD-EC55/EC77/GX99
PRINTED WIRING BOARDS — DECK SECTION (EXCEPT US, CND) —
•
:Uses unleaded solder.
IC502
IC501
DECK BOARD
AUDIO IN
PHONES
1-872-061-
1-872-065-
13
(13)
14
(14)
(CHASSIS)
MAIN BOARD
BOARD
CN606
B
MAIN
CN605
J
FFC502
1
9
EXCEPT US,CND
FFC404
13
(13)
14
(14)
C406
C405
C402
C401
C403
C404
R545
JR504
R546
R543
C545
R544
C546
JR503
JR502
JR501
C543
C541
C539
C538
C537
C536
C535
C534
C533
C532
C531
C530
C529
C528
C527
C526
C525
C524
C523
C522
C521
C520
C519
C517
C512
C511
C510
C509
C506
R541
C505
R540
C504
C503
R539
R538
R537
R536
R535
R534
R533
R532
R531
R530
R529
R528
R527
R526
R525
R524
R523
R522
R521
R520
R519
R518
R517
R516
R515
R514
R513
R512
R511
R510
R509
R508
R507
R506
R505
R504
R503
R502
R501
E
E
J402
J401
JW401
JW403
JW402
1
9
JACK BOARD
JW509
JW508
JW510
JW503
JW502
Q501
Q502
ET501
JW507
JW506
JW505
JW504
JW501
C542
C540
C516
C515
C514
C513
C502
C501
CN501
L501
S501
TAPE MECHANISM
DECK
SUPPLEMENT-1
Page 3
(
(
SUPPLEMENT-1
Page 3
(
(
1
2
A
B
C
D
E
F
G
3
4
5
6
SCHEMATIC DIAGRAM — DECK SECTION (EXCEPT US, CND) —
No mark:TAPE PLAY or REC
0
0
5 . 5
5 . 5
0
3.4
3.5
3.5
6.9
3.4
3.5
3.5
3.4
6.7
3.4
3.4
3.4
3.5
3.5
B
MAIN
BOARD(1/2)
CN606
EXCEPT US,CND
6
2
1
3
5
4
L501
BIAS COIL
S501
0
R515
100k
R511
100k
R513
150
R509
1000p
C517
47p
C509
220p
C511
0
R516
100k
R512
150
R510
100k
R514
220p
C512
47p
C510
47p
C525
47p
C526
2SC1740S-RT
Q501
2SC1740S-RT
Q502
2200p
C537
2200p
C536
2200p
C535
1
2
3
4
5
6
7
8
CN501
9V
M-GND
SW
EH
VREF
Lch
COM
Rch
E
ET501
C541
0 . 1
R540
47
R541
47
C539
1
R539
4 . 7
R537
10k
R538
10k
C538
0 . 0 1
R536
4 . 7 k
R535
4 . 7 k
R534
15k
R533
22k
R507
330k
R503
2 . 2 k
C505
0 . 0 1
C503
2200p
C504
2200p
R504
2 . 2 k
C506
0 . 0 1
R508
330k
2 . 2 k
R501
2 . 2 k
R502
16V
100
C502
16V
100
C501
R517
1k
R518
1k
C519
470p
C520
470p
C521
1
C522
1
R520
47k
R519
47k
R521
47k
R522
47k
C532
0 . 0 1
C531
0 . 0 1
R526
330k
R528
330k
R525
330k
R527
330k
R530
2 . 2 k
R529
2 . 2 k
R531
8 . 2 k
R532
8 . 2 k
C534
2200p
C533
2200p
50V
1
C513
50V
1
C514
TP501
TP502
TP504
TP503
TP505
TP506
TP508
TP509
TP507
8
7
6
5
4
3
2
1
NJM4558M-TE2
IC501
OUTPUT
INPUT
-
INPUT+
GND
INPUT+
INPUT
-
OUTPUT
VCC
8
7
6
5
4
3
2
1
NJM4558M-TE2
IC502
OUTPUT
INPUT
-
INPUT+
GND
INPUT+
INPUT
-
OUTPUT
VCC
C540
4700P
1
2
3
4
5
6
7
8
9
FFC502
9V
PB-Lch
PB-Rch
A-GND
REC-Lch
REC-Rch
M-GND
9V
I-TP-STATE
16V
47
C516
16V
47
C515
1000p
C543
1
C524
1
C523
25V
22
C542
100
R543
100
R544
0 . 1
C545
0 . 1
C546
C527
470p
C528
470p
C530
330p
C529
330p
R523
3 . 3 k
R524
3 . 3 k
R505
15k
R506
15k
470
R545
470
R546
8P
BIAS OSC
BIAS OSC
9P
(CHASSIS)
C403
2 2 k
C404
2 2 k
TAPE MECHANISM
DECK
J
MAIN
BOARD(2/2)
CN605
SUPPLEMENT-1
Page 5
(
(
SUPPLEMENT-1
Page 4
(
(
IC501
HEAD AMP
IC502
HEAD AMP
DECK BOARD
1
2
3
4
5
A
B
C
D
E
F
G
J401
AUDIO IN
C401
0 . 1
C402
0 . 1
C405
1000p
C406
1000p
TP401
TP402
TP403
TP404
TP405
TP406
TP407
TP408
J402
1
2
3
4
5
6
7
8
9
FFC404
9P
AUDIO-L
A-GND
AUDIO-R
HP-GND
H
P-L
H
P-R
AMP-ON
SP-RELAY
GND
PHONES
JACK BOARD
Ver. 1.2
14
14
HCD-EC55/EC77/GX99
HCD-EC55/EC77/GX99
PRINTED WIRING BOARD — PT BOARD (EXCEPT EC55: US, CND) —
•
:Uses unleaded solder.
SCHEMATIC DIAGRAM — PT BOARD (EXCEPT EC55: US, CND) —
MX
MX
D055
D052
D051
C051
D055
D052
D051
D055
D052
D051
D055
D052
D051
RY002
JW010
JW054
T002
T001
JW018
JW017
JW016
JW015
JW014
JW013
JW012
JW011
JW008
JW007
JW002
JW001
JW004
JW005
JW003
JW009
JW006
RY001
CN051
W051
TP003 EC55:E2,SP,E51,AR,AUS,KR
E
EXCEPT
JW054
JW018
JW012
TP002 EC77:US,CND,MX,AEP,RU/GX99
EC77:E2,E3,E51,AR,AUS
JW054
JW018
JW012
TP002
JW054
JW018
JW012
TP003 EC55:AEP,UK,RU,MX
KR,AR,SP,AUS
E2,E3,E51,MX
E2,E3,E51,MX
E2,E3,E51,MX
E2,E3,E51,MX
KR,AR,SP,AUS
KR,AR,SP,AUS
US,CND,AEP,UK,RU
(E2,E3,E51,SP)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
11
12
13
14
15
AC IN
PT001
NOT REPLACEABLE
BULT IN TRANSFORMER
BULT IN TRANSFORMER
*
*
1-872-063-
13
(13)
14
(14)
POWER TRANSFORMER (SUB)
POWER TRANSFORMER (MAIN)
MAIN BOARD
CN604
(
(
SUPPLEMENT-1
Page 3
PT BOARD
16
17
220V
230-240V
120V
S001
VOLTAGE
SELECTOR
EXCEPT EC55 : US,CND
1
5
6
7
8
9
10
11
12
13
14
15
NOT REPLACEABLE
BULT IN TRANSFORMER
BULT IN TRANSFORMER
*
*
POWER TRANSFORMER (MAIN)
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
NOT REPLACEABLE
BULT IN TRANSFORMER
BULT IN TRANSFORMER
*
*
POWER TRANSFORMER (MAIN)
16
17
1
5
6
7
8
9
10
11
12
13
14
15
NOT REPLACEABLE
BULT IN TRANSFORMER
BULT IN TRANSFORMER
*
*
POWER TRANSFORMER (MAIN)
16
17
KR,AR,SP,AUS
E2,E3,E51
AUS
KR,AR
1
2
A
B
C
D
E
F
G
H
I
J
K
3
4
5
6
7
PT BOARD
KR,AR,SP,AUS
KR,AR,SP,AUS
KR,AR,SP,AUS
E2,E3,E51
E2,E3,E51,MX
E2,E3,E51,MX
E2,E3,E51,MX
AUS
KR,AR
C051
0.1
MC2836-T112-1
D051
MC2838-T112-1
D052
10
JW001
JW009
JW003
10
JW002
TERMINAL (1P)
T001
TERMINAL (1P)
T002
S001
E2,E3,E51,SP
RY001
1
2
3
4
1
2
3
4
5
6
7
8
HOLDER, CABLE 8P
8P
CN051
RELAY ON/OFF
V STBY
AC DETECT
VH(AC)
VL(AC)
GND
VL(AC)
VH(AC)
RY002
1
2
3
4
5
6
MC2838-T112-1
D055
1
7
13
14
10
12
11
15
3
5
8
9
16
17
2
4
6
1
7
13
14
10
12
11
15
5
8
9
16
17
6
1
3
4
5
6
7
8
9
2
PT001
JW007
JW008
JW006
JW005
120V
220V
230-240V
L
N
MAIN BOARD
(2/2)
CN604
SUPPLEMENT-1
Page 5
(
(
EC55:AEP,UK,RU,MX
GX99
EC77:US,CND,MX,AEP,RU
EC55:E2,SP,E51,AR,AUS,KR
EC77:E2,E3,E51,AR,AUS
EXCEPT EC55 : US,CND
E
EC55 : AEP,UK,RU/EC77 : US,CND,AEP,RU/GX99
EXCEPT
*
*
*
VOLTAGE
SELECTOR
MX
JW004
MX
AC IN
POWER TRANSFORMER
POWER TRANSFORMER
POWER TRANSFORMER
(MAIN)
(MAIN)
POWER TRANSFORMER
(MAIN)
(SUB)
Not Replaceable
Built in Transformer
*
Not Replaceable
Built in Transformer
TP002
TP003
TP002:EC77/GX99
TP003:EC55
1
2
A
B
C
D
E
F
3
4
5
6
7
9
8
10
KR,AR,SP,AUS
• Semiconductor
Location
Ref. No.
Location
D051
E-3
D052
E-3
D055
E-3
Ver. 1.2
15
HCD-EC55/EC77/GX99
ELECTRICAL PARTS LIST
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
A-1218-569-A DECK BOARD, COMPLETE
(EC77: EXCEPT US,CND)
A-1218-730-A DECK BOARD, COMPLETE
(EC55: EXCEPT US,CND)
*********************
< CAPACITOR >
C501
1-126-933-11 ELECT
100uF
20%
16V
C502
1-126-933-11 ELECT
100uF
20%
16V
C503
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C504
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C505
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
C506
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
C509
1-162-923-11 CERAMIC CHIP
47PF
5%
50V
C510
1-162-923-11 CERAMIC CHIP
47PF
5%
50V
C511
1-162-960-11 CERAMIC CHIP
220PF
10%
50V
C512
1-162-960-11 CERAMIC CHIP
220PF
10%
50V
C513
1-126-960-11 ELECT
1uF
20%
50V
C514
1-126-960-11 ELECT
1uF
20%
50V
C515
1-126-947-11 ELECT
47uF
20%
35V
C516
1-126-947-11 ELECT
47uF
20%
35V
C517
1-162-964-11 CERAMIC CHIP
0.001uF
10%
50V
C519
1-162-962-11 CERAMIC CHIP
470PF
10%
50V
C520
1-162-962-11 CERAMIC CHIP
470PF
10%
50V
C521
1-125-837-91 CERAMIC CHIP
1uF
10%
6.3V
C522
1-125-837-91 CERAMIC CHIP
1uF
10%
6.3V
C523
1-125-837-91 CERAMIC CHIP
1uF
10%
6.3V
C524
1-125-837-91 CERAMIC CHIP
1uF
10%
6.3V
C525
1-162-923-11 CERAMIC CHIP
47PF
5%
50V
C526
1-162-923-11 CERAMIC CHIP
47PF
5%
50V
C527
1-162-962-11 CERAMIC CHIP
470PF
10%
50V
C528
1-162-962-11 CERAMIC CHIP
470PF
10%
50V
C529
1-162-961-11 CERAMIC CHIP
330PF
10%
50V
C530
1-162-961-11 CERAMIC CHIP
330PF
10%
50V
C531
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
C532
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
C533
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C534
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C535
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C536
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C537
1-162-966-11 CERAMIC CHIP
0.0022uF 10%
50V
C538
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
C539
1-115-156-11 CERAMIC CHIP
1uF
10V
C540
1-137-391-11 MYLAR
0.0047uF 5%
100V
C541
1-100-566-91 CERAMIC CHIP
0.1uF
10%
25V
C542
1-104-662-91 ELECT
22uF
20%
25V
C543
1-162-964-11 CERAMIC CHIP
0.001uF
10%
50V
C545
1-100-566-91 CERAMIC CHIP
0.1uF
10%
25V
C546
1-100-566-91 CERAMIC CHIP
0.1uF
10%
25V
< CONNECTOR >
CN501
1-815-449-11 PIN, CONNECTOR (PWB) 8P
< TERMINAL >
ET501
1-537-771-21 TERMINAL BOARD, GROUND
< IC >
IC501
8-759-100-96 IC uPC4558G2
IC502
8-759-100-96 IC uPC4558G2
< JUMPER RESISTOR >
JR501
1-216-864-11 SHORT CHIP
0
JR502
1-216-864-11 SHORT CHIP
0
JR503
1-216-864-11 SHORT CHIP
0
JR504
1-216-295-91 SHORT CHIP
0
< COIL >
L501
1-456-094-11 TRANSFORMER, BIAS OSCILLATION
< TRANSISTOR >
Q501
8-729-119-78 TRANSISTOR
2SC2785-HFE
Q502
8-729-119-78 TRANSISTOR
2SC2785-HFE
< RESISTOR >
R501
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
R502
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
R503
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
R504
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
R505
1-216-835-11 METAL CHIP
15K
5%
1/10W
R506
1-216-835-11 METAL CHIP
15K
5%
1/10W
R507
1-216-851-11 METAL CHIP
330K
5%
1/10W
R508
1-216-851-11 METAL CHIP
330K
5%
1/10W
R509
1-216-811-11 METAL CHIP
150
5%
1/10W
R510
1-216-811-11 METAL CHIP
150
5%
1/10W
R511
1-216-845-11 METAL CHIP
100K
5%
1/10W
NOTE:
•
Due to standardization, replacements in the
parts list may be different from the parts
specified in the diagrams or the components
used on the set.
parts list may be different from the parts
specified in the diagrams or the components
used on the set.
•
-XX and -X mean standardized parts, so they
may have some difference from the original
one.
may have some difference from the original
one.
•
RESISTORS
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
•
CAPACITORS
uF:
uF:
µ
F
•
COILS
uH:
uH:
µ
H
•
Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
•
SEMICONDUCTORS
In each case, u:
In each case, u:
µ
, for example:
uA. . :
µ
A. .
uPA. . :
µ
PA. .
uPB. . :
µ
PB. .
uPC. . :
µ
PC. .
uPD. . :
µ
PD. .
•
Abbreviation
AR
AR
: Argentine model
AUS
: Australian model
CND
: Canadian model
E2
: 120V AC area in E model
E3
: 240V AC area in E model
E51
: Chilean and Peruvian model
When indicating parts by reference number,
please include the board name.
please include the board name.
The components identified by mark 0 or
dotted line with mark 0 are critical for safety.
Replace only with part number specified.
dotted line with mark 0 are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque 0
sont critiques pour la sécurité.
Ne les remplacer que par une pièce portant le
numéro spécifié.
sont critiques pour la sécurité.
Ne les remplacer que par une pièce portant le
numéro spécifié.
KR
: Korean model
MX
: Mexican model
RU
: Russian model
SP
: Singapore model
DECK
Ver. 1.2
16
HCD-EC55/EC77/GX99
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
R512
1-216-845-11 METAL CHIP
100K
5%
1/10W
R513
1-216-845-11 METAL CHIP
100K
5%
1/10W
R514
1-216-845-11 METAL CHIP
100K
5%
1/10W
R515
1-216-864-11 SHORT CHIP
0
R516
1-216-864-11 SHORT CHIP
0
R517
1-216-821-11 METAL CHIP
1K
5%
1/10W
R518
1-216-821-11 METAL CHIP
1K
5%
1/10W
R519
1-216-841-11 METAL CHIP
47K
5%
1/10W
R520
1-216-841-11 METAL CHIP
47K
5%
1/10W
R521
1-216-841-11 METAL CHIP
47K
5%
1/10W
R522
1-216-841-11 METAL CHIP
47K
5%
1/10W
R523
1-216-827-11 METAL CHIP
3.3K
5%
1/10W
R524
1-216-827-11 METAL CHIP
3.3K
5%
1/10W
R525
1-216-851-11 METAL CHIP
330K
5%
1/10W
R526
1-216-851-11 METAL CHIP
330K
5%
1/10W
R527
1-216-851-11 METAL CHIP
330K
5%
1/10W
R528
1-216-851-11 METAL CHIP
330K
5%
1/10W
R529
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
R530
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
R531
1-216-832-11 METAL CHIP
8.2K
5%
1/10W
R532
1-216-832-11 METAL CHIP
8.2K
5%
1/10W
R533
1-216-837-11 METAL CHIP
22K
5%
1/10W
R534
1-216-835-11 METAL CHIP
15K
5%
1/10W
R535
1-216-829-11 METAL CHIP
4.7K
5%
1/10W
R536
1-216-829-11 METAL CHIP
4.7K
5%
1/10W
R537
1-216-833-11 METAL CHIP
10K
5%
1/10W
R538
1-216-833-11 METAL CHIP
10K
5%
1/10W
R539
1-216-793-11 METAL CHIP
4.7
5%
1/10W
R540
1-216-805-11 METAL CHIP
47
5%
1/10W
R541
1-216-805-11 METAL CHIP
47
5%
1/10W
R543
1-216-809-11 METAL CHIP
100
5%
1/10W
R544
1-216-809-11 METAL CHIP
100
5%
1/10W
R545
1-216-817-11 METAL CHIP
470
5%
1/10W
R546
1-216-817-11 METAL CHIP
470
5%
1/10W
< SWITCH >
S501
1-762-369-11 SWITCH, SLIDE (REC/PB SW)
*************************************************************
HI-AMP BOARD
*************
*************
< CAPACITOR >
C101
1-126-960-11 ELECT
1uF
20%
50V
C102
1-126-960-11 ELECT
1uF
20%
50V
C103
1-164-315-11 CERAMIC CHIP
470PF
5%
50V
C104
1-164-315-11 CERAMIC CHIP
470PF
5%
50V
C105
1-162-927-11 CERAMIC CHIP
100PF
5%
50V
C106
1-162-927-11 CERAMIC CHIP
100PF
5%
50V
C107
1-126-947-11 ELECT
47uF
20%
35V
C108
1-126-947-11 ELECT
47uF
20%
35V
C109
1-162-908-11 CERAMIC CHIP
3PF
0.25PF 50V
C110
1-162-908-11 CERAMIC CHIP
3PF
0.25PF 50V
C111
1-126-968-11 ELECT
100uF
20%
50V
(EC55/EC77: EXCEPT US,CND)
C111
1-128-576-11 ELECT
100uF
20%
63V
(EC77: US, CND/GX99)
C113
1-126-968-11 ELECT
100uF
20%
50V
(EC55/EC77: EXCEPT US,CND)
C113
1-128-576-11 ELECT
100uF
20%
63V
(EC77: US, CND/GX99)
C115
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
C116
1-162-968-11 CERAMIC CHIP
0.0047uF 10%
50V
(EC77/GX99)
C116
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
(EC55)
C118
1-162-968-11 CERAMIC CHIP
0.0047uF 10%
50V
(EC55)
C119
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
(EC77/GX99)
C119
1-216-864-11 SHORT CHIP
0 (EC55)
C120
1-162-970-11 CERAMIC CHIP
0.01uF
10%
25V
(EC77/GX99)
C120
1-216-864-11 SHORT CHIP
0 (EC55)
C151
1-162-968-11 CERAMIC CHIP
0.0047uF 10%
50V
C152
1-162-968-11 CERAMIC CHIP
0.0047uF 10%
50V
C153
1-100-566-91 CERAMIC CHIP
0.1uF
10%
25V
C154
1-165-621-91 CERAMIC CHIP
0.1uF
50V
C155
1-165-621-91 CERAMIC CHIP
0.1uF
50V
< CONNECTOR >
* CN101
1-569-505-11 PIN, CONNECTOR 10P
< DIODE >
D121
6-501-730-01 DIODE MAZ8051GMLS0 (EC55)
D151
6-500-335-01 DIODE MC2838-T112-1
D152
8-719-404-50 DIODE MA111-TX
< IC >
IC101
6-705-620-01 IC STK433-060 (EC55)
IC101
6-705-621-01 IC STK433-070 (EC77: EXCEPT US,CND)
IC102
6-600-580-01 IC STK433-090-E (EC77: US, CND/GX99)
< TRANSISTOR >
Q101
8-729-600-22 TRANSISTOR
2SA1235-F (EC55)
Q102
8-729-620-07 TRANSISTOR
2SC3052EF-T1-LEF
Q151
6-551-270-01 TRANSISTOR
2SA2026
Q152
6-551-270-01 TRANSISTOR
2SA2026
< RESISTOR >
R101
1-216-813-11 METAL CHIP
220
5%
1/10W
(EC77: US, CND/GX99)
R101
1-216-824-11 METAL CHIP
1.8K
5%
1/10W
(EC77: E2, E3, E51, MX, AR, AUS)
R101
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
(EC55/EC77: AEP, RU)
R102
1-216-813-11 METAL CHIP
220
5%
1/10W
(EC77: US, CND/GX99)
R102
1-216-824-11 METAL CHIP
1.8K
5%
1/10W
(EC77: E2, E3, E51, MX, AR, AUS)
R102
1-216-825-11 METAL CHIP
2.2K
5%
1/10W
(EC55/EC77: AEP, RU)
R103
1-216-830-11 METAL CHIP
5.6K
5%
1/10W
(EC55)
R103
1-216-834-11 METAL CHIP
12K
5%
1/10W
(EC77: AEP, RU)
R103
1-216-835-11 METAL CHIP
15K
5%
1/10W
(EC77: EXCEPT AEP,RU/GX99)
DECK
HI-AMP
Ver. 1.2
Click on the first or last page to see other HCD-EC55 / HCD-EC77 / HCD-GX99 service manuals if exist.