The following check should be performed for the continued protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the power
cord is less than 460 kohms, the unit is defective.
SYS-57HT
CAUTION
Please heed the points listed below during servicing and inspection.
◎ Heed the cautions!
Spots requiring particular attention when servicing, such as
the cabinet, parts, chassis, etc., have cautions indicated on
labels or seals. Be sure to heed these cautions and the cautions indicated in the handling instructions.
◎ Caution concerning electric shock!
(1) An AC voltage is impressed on this set, so touching inter-
nal metal parts when the set is energized could cause
electric shock. Take care to avoid electric shock, by for example using an isolating transformer and gloves when
servicing while the set is energized, unplugging the power
cord when replacing parts, etc.
(2)There are high voltage parts inside. Handle with extra care
when the set is energized.
◎
Caution concerning disassembly and assembly!
Though great care is taken when manufacturing parts from
sheet metal, there may in some rare cases be burrs on the
edges of parts which could cause injury if fingers are moved
across them. Use gloves to protect your hands.
◎ Only use designated parts!
The set's parts have specific safety properties (fire resistance, voltage resistance, etc.). For replacement parts, be
sure to use parts which have the same properties. In particular, for the important safety parts that are marked ! on wiring
diagrams and parts lists, be sure to use the designated parts.
◎ Be sure to mount parts and arrange the
wires as they were originally!
For safety reasons, some parts use tape, tubes or other insulating materials, and some parts are mounted away from the
surface of printed circuit boards. Care is also taken with the
positions of the wires inside and clamps are used to keep
wires away from heating and high voltage parts, so be sure to
set everything back as it was originally.
◎ Inspect for safety after servicing!
Check that all screws, parts and wires removed or disconnected for servicing have been put back in their original positions, inspect that no parts around the area that has been
serviced have been negatively affected, conduct an insulation
check on the external metal connectors and between the
blades of the power plug, and otherwise check that safety is
ensured.
(Insulation check procedure)
Unplug the power cord from the power outlet, disconnect the
antenna, plugs, etc., and turn the power switch on. Using a
500V insulation resistance tester, check that the insulation resistance between the terminals of the power plug and the externally exposed metal parts (antenna terminal, headphones
terminal, microphone terminal, input terminal, etc.) is 1MΩ or
greater. If it is less, the set must be inspected and repaired.
CAUTION
Many of the electric and structural parts used in the set have
special safety properties. In most cases these properties are
difficult to distinguish by sight, and using replacement parts
with higher ratings (rated power and withstand voltage) does
not necessarily guarantee that safety performance will be preserved. Parts with safety properties are indicated as shown
below on the wiring diagrams and parts lists is this service
manual. Be sure to replace them with parts with the designated part number.
(1) Schematic diagrams ... Indicated by the ! mark.
(2) Parts lists ... Indicated by the ! mark.
Concerning important safety parts
Using parts other than the designated parts
could result in electric shock, fires or other
dangerous situations.
RD :2B : 1/8 WF : ±1%P :
RC :2E : 1/4 W G : ±2%NL :
RS :2H : 1/2 W J : ±5%NB :
RW :3A : 1 WK : ±10%FR :
RN :3D : 2 W M : ±20%F :
RK :3F : 3 W
∗
18 2
1R 2
3H : 5 W
1800
Ö
2
1.2
Ö
1
2R
=1.8k
0
ll
l Capacitors
ll
Ex.: CE04W1H2R2MBP
Type Shape Dielectric Capacity Allowable Others
and per- strengtherror
formance
CE : Aluminum foil0J : 6.3VF : ±1%HS : High stability type
electrolytic
CA : Aluminum solid1A : 10VG : ±2%BP : Non-polar type
electrolytic
CS : Tantalum electrolytic1C : 16VJ : ±5%HR : Ripple-resistant type
CQ : Film1E : 25VK : ±10%DL : For change and discharge
CK : Ceramic1V : 35VM : ±20%HF : For assuring high
CC : Ceramic1H : 50VZ : +80%U : UL par t
CP : Oil2A : 100V–20%C : CSA par t
CM : Mica2B : 125V P : +100% W : UL-CSA type
CF : Metallized2C : 160V–0%F : Lead wire forming
CH : Metallized2D : 200VC : ±0.25pF
] Capacity (electrolyte only)
2 2 2⇒2200µF
s
s
• Units: µF.
2 R 2⇒2.2µF
s
s
• Units: µF.
] Capacity (except electrolyte)
2 2 2⇒2200pF=0.0022µF
s
s
(More than 2) Indicates number of zeros after effective number.
• Units: pF.
2 2 1⇒220pF
s
s
(0 or 1)Indicates number of zeros after effective number.
• Units: pF.
• When the dielectric strength is indicated in AC, "AC" is included after the dieelectric
strength value.
2E : 250V D : ±0.5pF
2H : 500V = : Others
2J : 630V
Indicates number of zeros after effective number.
2-digit effective number.
1-digit effective number.
2-digit effective number, decimal point indicated by R.
*本表に記載されている部品は、補修用部品のため製品に使用している部品とは一部、形状、寸法などが異なる場合があります。
* The parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions.
*"nsp" 印の部品は常時在庫していませんので供給に長時間を要することがあります。場合によっては、供給をお断りする場合があります。
* Part indicated with the mark “nsp” are not always in stock and possibly to take a long period of time for supplying, or in some case supplying of part may be refused.
C121,12200D DSW 7601 012ERECTRIC C 4700uF/35V135-4478m35-e
C123-128- FILM C 0.022uF/100V132-223ja03-e
C129,130- ERECTRIC C 220U/10V135-3227m10-e
C131,132- FILM C 0.022uF/100V132-223ja03-e
C133,13400D DSW 7601 013ERECTRIC C 4700uF/63V135-4478m63-e
C135,136- ERECTRIC C 100U/50V135-3107m50-e
C137,138- CERAMIC C 0.1U/50V30-3f104z503-e
C139,140- CERAMIC C 100P/50V130-sl101k503-e
C141- CERAMIC C 1000P/50V130-2b102k503-e
OTHER PARTS GROUP
P101- 7PIN CONNECTOR175-1c07v01-e
P102- 2PIN CONNECTOR175-1d02v01-e
P103- 5PIN CONNECTOR175-1d05v01-e
P104- 2PIN CONNECTOR175-1c02v01-e
RY10100D DSW 7601 054RELAY/24V71-udhss124d-e*
10
DSW-76(Black) Section
Ref. NonspPart No.Part NameRemarkQ'tyNew
- TUBE 1M*10mm156-h010010-e
- SHEET361-NYL-00054-0LAE*
- TR BLACKET361-FE-00051-0LAE*
- HEAT SINK323-AL-00020-0LAE*
- M3*14 SCREW351-AM03014A094-J
- M3*8 SCREW352-AM03008D040-J*
POWER P.W.B. UNIT ASS'Y
Ref. NonspPart No.Part NameRemarkQ'tyNew
SEMICONDUCTORS GROUP
D30100D DSW 7601 045D 1/2W/12V199-05001200j-e
RESISTER GROUP
R30100D DSW 7601 007R 0.56K/2W110-20561jk3-e
SYS-57HT
CAPACITORS GROUP
C301-FILM C 0.01uF/275V132-103kb74-e
OTHER PARTS GROUP
P301-3PIN CONNECTOR175-1d03v04-e
P302-5PIN CONNECTOR WIRE162-5026d001-e*
P303-3PIN CONNECTOR175-1d03v02-e
RY30100DDSW 7601 056RELAY171-cs112lmr-e*
!00D DSW 7601 015SUB TRANS150-e0351201-e*
-TUBE 1M*10mm156-h010010-e
11
DSW-76(Black) EXPLODED VIEW
Parts marked with this symbol have critical
characteristics.
Use ONLY replacement parts recommended by
the manufacturer.
WARNING:
印の部分は安全を維持するために重要
な部品です。従って交換時は必ず指定の
部品を使用してください。
1
DSW-76(Black) Section
2
SYS-57HT
104
103
101
29
28
30
101
4
3
6
5
34
32
31
33
35
11
14
15
16
17
27
12
18
13
19
101
23
22
20
21
102
101
24
105
26
7
102
8
25
12
SYS-57HTDSW-76(Black) Section
DSW-76(Black) PARTS LIST OF EXPLODED VIEW
*本表に記載されている部品は、補修用部品のため製品に使用している部品とは一部、形状、寸法などが異なる場合があります。
* The parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions.
*"nsp" 印の部品は常時在庫していませんので供給に長時間を要することがあります。場合によっては、供給をお断りする場合があります。
* Part indicated with the mark “nsp” are not always in stock and possibly to take a long period of time for supplying, or in some case supplying of part may be refused.
13 nsp00D DSW 7601 004 POWER P.W.B. UNIT051-A00434C-E1
14- EVA333-EVA-00783-0BAE2
15- WIRE CLAMP163-11009-e2
16- EVA333-EVA-00807-0BAE2
17- CASE306-ABS-00206-1BBE1
18- BRACKET Large-R361-FE-05008-0LBE1
19- HEAT SINK309-ABS-05003-0BAE1
!2000D DSW 7601 015 SUB TRANS150-e0351201-e1
21- BRACKET Small-L361-FE-05010-0LAE1
22- BRACKET Small-R361-FE-05011-0LAE1
23 nsp00D DSW 7601 053 BACK PANEL302-AL-05021-2BBE1
!2400D DSW 7601 022 POWER SWITCH180-prf1003s-e1
!2500D DSW 7601 018 AC COARD152-u75201601-e1
26- COVER309-ABS-05003-0BAE1
27- HEAT SINK323-AL-00019-0BBE1
28- BUSH335-NYL-00002-0BAE2
29- RUBBER SHEET 25*21*2T336-RUB-00263-0BAE4
!3000D DSW 7601 017 MAIN TRANS150-e0865005-e1
31- M4 NUT354-GM04002-J4
32- PWB HOLDER61-FE-05013-0LAE1
33- EVA333-EVA-00835-0BAE2
34- BRACKET Large-L361-FE-05008-0LAE1
35- EVA333-EVA-00826-0BAE2
!3600D DSW 7601 020 FUSE 125V154-u25002t0-e1
!37- CERAMIC C 4700P130-3f472md00-e1
38- FUSE HOLDER R3-11155-520020-e1
39- TUBE 20mm*40mm156-h200040-e1
40- TUBE 20mm*60mm156-h200060-e1
41- TUBE 7mm*120mm156-h070120-e1
43- LED HOLDER7.5*7.1*8.25361-NYL-05012-0BAE1
45- EVA333-EVA-00220-0BAE6
46- EVA333-EVA-05052-0BAE4
101- M3*8 SCREW351-AM03008A079-J19
102- M3*8 SCREW352-AM03008D040-J14
103- M3*10 SCREW352-BM03010D064-J2
104- M3*14 SCREW351-BM03014A093-J1
105- M4*16 SCREW351-HM04016A218-J4
106- M3*10 SCREW352-AM03010D065-J1
107- M3*14 SCREW351-BM03014A093-J1
108- 4M*12 SCREW350-EM04012D024-J10
13
DSW-76(Black) WIRING DIAGRAM
LI MI T
MUTE
-15V
AGND
+15V
PTC
in
AMP P.W.B. UNIT
AC2
AC4
PGND
AC3
AC1
PGND
PGND
DSW-76(Black) Section
SYS-57HT
PRE AMP P.W.B. UNIT
POWER P.W.B. UNIT
SIGNAL IN
SI GNAL I N
12VAC
LI MI T
-12V
-12V
MUTE
STBY
STBY
AC
-15V
AGND
AC1
AC2
12VA C
12VA C
PGND
AC
PTC
+15V
PGND
PGND
OUT
AC-ST
AC
12VAC
POW ER
14
DSW-76(Black) Section
SYS-57HT
NOTE FOR SCHEMATIC DIAGRAM
WARNING:
Parts marked with this symbol have critical characteristics.
Use ONLY replacement parts recommended by the manufacturer.
CAUTION:
Before returning the unit to the customer, make sure you make
either (1) a leakage current check or (2) a line to chassis resistance check. If the leakage current exceeds 0.5 milliamps, or if
the resistance from chassis to either side of the power cord is
less than 460 kohms, the unit is defective.
WARNING:
DO NOT return the unit to the customer until the problem is located and corrected.
NOTICE:
ALL RESISTANCE VALUES IN OHM. k=1,000 OHM
M=1,000,000 OHM
ALL CAPACITANCE VALUES IN MICRO FARAD.
P=MICRO-MICRO FARAD
EACH VOLTAGE AND CURRENT ARE MEASURED AT
NO SIGNAL INPUT CONDITION.
CIRCUIT AND PARTS ARE SUBJECT TO CHANGE
WITHOUT PRIOR NOTICE.
*本表に記載されている部品は、補修用部品のため製品に使用している部品とは一部、形状、寸法などが異なる場合があります。
* The parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions.
*"nsp" 印の部品は常時在庫していませんので供給に長時間を要することがあります。場合によっては、供給をお断りする場合があります。
* Part indicated with the mark “nsp” are not always in stock and possibly to take a long period of time for supplying, or in some case supplying of part may be refused.
*本表に記載されている部品は、補修用部品のため製品に使用している部品とは一部、形状、寸法などが異なる場合があります。
* The parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions.
*"nsp" 印の部品は常時在庫していませんので供給に長時間を要することがあります。場合によっては、供給をお断りする場合があります。
* Part indicated with the mark “nsp” are not always in stock and possibly to take a long period of time for supplying, or in some case supplying of part may be refused.
*本表に記載されている部品は、補修用部品のため製品に使用している部品とは一部、形状、寸法などが異なる場合があります。
* The parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions.
209
SW
209
SR
SL
C
209
216
217
211
*"nsp" 印の部品は常時在庫していませんので供給に長時間を要することがあります。場合によっては、供給をお断りする場合があります。
* Part indicated with the mark “nsp” are not always in stock and possibly to take a long period of time for supplying, or in some case supplying of part may be refused.