Technics SECH 505 Service Manual

Page 1

Service

Amplifier
SL-CHSOS ST-CH505

Remote Control or or
Transmitter SL-CH707 ST-CH707

l

SB-CH505 RS-CHSOS SE-CH505 SB-CHSOS

Because of unique interconnecting cables,
when a component requires service, send
or bring in the entire system.

Specifications

ORDER NO. A0930928303

Manual

Amplifier

SE-CH505

Colour
(K) . . . .Black Type

Areas

Suffix for

Model No Area Colour

Asia, Latin America,
(GO) Middle Near East and
Africa (K)

(GN) Oceania

System: SC-CH505

Power output I General
DIN 1 kHz, THD 1%, both channel driven Power consumption 170 W
2X50 W (69) Power supply
Total harmonic distortion For (GN) area 230 v~24o v, AC 50/60 Hz
Rated Power at 1 kHz 1% (60) For (GO) area 110/127/220/240 v, AC 50/60 Hz
Half power at 1 kHz 009% (60) Dimensions (WXHXD) 270x1185x335 mm
Load impedance Weight 4.4 kg
MAIN 6~BQ
SURROUND 30 Notes:
S/N (rated power) 84 dB 1. Weights and dimensions shown are approximate.
Input MIC; 6000, $62 2. Design and specifications are subject to change
Output HEADPHONE; 320, (335 without notice.
3. Total harmonic distortion is measured by the
digital spectrum analyzer.
System Tuner Compact disc player Amplifier Cassette deck Speakers
ST-CH505: GN area SL-CH505: GN area ,
SC'CH505 ST-CH707: ice; area SL-CH707: ice; area SE'CH505 RS'CH505 SB'CH505

Technics

Made in Taiwan

Page 2

SE-CH505

I Contents

Page
OBEFORE REPAIR ................................... 2
oPROTECTION CIRCUITRY . . . . 2
oBEFORE USE FOR ((30) AREA ........................ 2
oACCESSORIES .................................... 3
oLOCATiON OF CONTROLS . . . . 4
oSTACKlNG THE COMPONENTS ....................... 5
oCONNECTlONS .................................. 6~10
oDlSASSEMBLY INSTRUCTIONS .................... 11N14

l Before Repair

Page
ISCHEMATIC DIAGRAM ........................... 15~19
OPRINTED CIRCUIT BOARD DIAGRAM . . 20~22
OWIRING CONNECTION DIAGRAM ..................... 23
OBLOCK DIAGRAM ................................... 24
IPOWER SOURCE ON/OFF OF THIS UNlT SECHSOS . . . 25
OFUNCTION OF IC TERMINALS ........................ 25
IREPLACEMENT PARTS LIST ...................... 26~29
ICABINET PARTS LOCATION . . . . . . 30
oPACKAGlNG ................................... 31. 32

(1) Turn oft the power supply. Using a 100. 10 W resistor, connect both ends of power supply capacitors (C701, 0702) in order to discharge the

voltage.

(2) Belore turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage controller to make
sure that the consumed current at 50/60 HZ in NO SIGNAL mode should be shown below with respect to supply voltage 110 V/127 V/220 V/

240 V.
Power supply voltage AC 110~127 V AC 220~240 V AC 240 V
Consumed current 50 Hz 160N380 mA 80~190 mA BO~180 mA

l Protection Circuitry

The protection circuitry may have operated it either of the following conditions is noticed:

'No sound is heard when the power is switched 0N.
'Sound stops during a performance.

The functions of this circuitry is to prevent circuitry damage it, for example. the positive and negative speaker connection wires are shorted", or it
speaker systems with an impedance less than the indicated rated impedance at this unit are used.

II this occurs. follow the procedure outlined below:
1. Switch OFF the power.
2. Determine the cause or the probiem and correct it.
3. Switch ON the power once again.

Note:

When the protection circuitry lunctions. the unit will not operate unless the power is Iirst switched OFF and then ON again.

I Before Use for (GO) Area

Be sure to disconnect the mains cord before adjusting the voltage
selector.

Use a minus (~) screwdriver to set the voltage selector (on the
bottom of the amplifier) to the voltage setting for the area in which
the unit will be used.

(it the power supply in your area is 117 V or 120 V, set to the
127 V position.)

Note that this unit Will be seriously damaged if this setting is not
made correctly. (There is no voltage selector for some countries;
the correct voltage is already set.)

Page 7

SE-CH505

3 Connect the AM (MWILW) loop \
antenna.

1. Attach the antenna holder to the
rear panel of the tuner/sound pro-
cessor,

2. Clamp the antenna to the antenna
holder and connect the antenna ter-
minal to the rear panel of the tuner/
sound processor.

3. Position the loop for the best recep»
tiont

You may attach the antenna holderto a

rack or other structure Use a screw

(included) to attach as showed in the

figure, [I

To minimize noise pickup, keep the AM
loop antenna cord away from the flat
cables.

(To be continued)

Antenna holder

Press in until you hear a click

Slide the antenna
holder while pressing.

AM loop antenna

fill

Page 24

SE-CH505

Ref. No Part No. j Values 81 Remarks Ref. 70. 7 Part No Values & Remarks Ref. No. Part N01 Values 81 Remarks
1151135505 01103213553 1/471 5511 11705 11103213472 1/47 4711 0557 00417111015 I 357 1000
1150775111 01103213102 1/47 111 11703 7101151333910 17 300 A 0571 0004031141015 1 {3717 717000
11511 01103213334 71 33011 11711 01101333310 1w 330 A 0572 00511022320 257 0.0220
E12 01103213154 77 15011 77 7 11713 EMMT 1/4w 1.11 0551.552 00511047211115 157 470110
11513 01103213554 1/47 511011 7 11714 01103213153 1/4w 1511 0553, 554 00111032231105 5.3700220
11514 01102503470 1/51 7 7 7477 A 77 11715 01103213353 77i/4w 3511 0591.532 0004110140105 507 30
11515515 01103107310017 {/20 10 A 117177 0103213473 | 1/4w 47K 0593. 504 00071111043113 5117 0110
@513 0110251731001 #1247 . LA 7 117751 01103213472 11/411' 4. 711 05911 0051101031435 157 5.010
11571 011032135231 MW 5211 11752 01103213332 1 1/41' 3311 0501-555 00011101141005 157 100 .
11572 011032131241 1/417 1200 5753.754 0110321321171 J1/4w 7727.777 7 0507 00011030102 5.37 10000 7-7
5573 01103213553 1/4w 5511 11750 01103213522 1/47 5. 211 077579 7 00511010320 257 0.010
5574 01103213554 1/4w 55011 11799 01103213103 1/471 7 710K 7 7 057107511 0004101141005 157 100
5575 01103213223 1/4w 22K 0512 77 0004110431135 507 3.30
@3157 01103213152 74711777175711 7 7 70111140110113 0513, 514 00511010320 257 0. 010
1151135114 01103213331 1}! 330 77777 0515, 515 77 0004171143305 35V,... 330 77
1151155115 01103213474 1/4w 47011 0251 00041131142215 5. 37 2200 0517. 515 0004101141005 157 100
1151175511 01103213123 1/417 1211 0301.302 00041101435351 50777 3. 30 77 05217. 522 00511022320 257 0.0220
557917 50777 7011037213221 1/417 220 7 0303.304 700511M5 '1 557 150 0531 0004031142215] 5. 37 2200
71503504 071M332 71/41 1K 7 03705301177 0051111331135 507 330 0032 0004101401051 507 10
55% 50571110321020 1/417 5211 0307,3011 0004101142205 157 221 0541542 001111010321 257 0010
1/47 1211 0351 0004107410011 157 1111 0571.572 0051100221135 157 52000
1/471 470 0352 00511022320 25700221 0701, 702 0004457472115 457 47000 A 7
01170521737703 7 17/471 10117 03753 7 0054111142525 7557 2. 21 0703. 704 0004101143305 157 330
75117. 512 0003213333 1 1/47 3311 0351 00041011470311 157 470 0705, 705 00101111103205 507 0.010
5513.514 01103213274 71/471 27011 0352 0004101141005 157 100 0757 0041111112215 507 2200 A
11515. 515 01103273123 71/47 71211 7 0371 00040354272157 5. 37 2200 07011 0004101141005 157 100
1715717, 5111 00032173273 1/4w 2711 M15112 00511010321 257 0.010 5703. 715 00511010320 257 0.510
11519520 01103213223 1/4w 2211 03957335 00511010320 257 0.010 0711 0000111141103 1007 0.10
5521. 522 01103213524 1 1/47 52011 7 0401 00511112211155 507 2200 0712 00511022320 257 0.0220
711523. 524 7011032132201 V40 22 7 0402 00511112211155 1 5117 2200 (00) 7 0714 00101111103205 507 0.0113
11525, 5213 01103213473 1/47 77477 777 64711377777 00041101435351 507 3.30 0731. 732 00111111102115 507 1000?
5527.525 01103213102 1/4w 111 507 2200 7 075717 .00074771771141005 357 100
11520 01103213472 1/4w 4.771177 77 507 10070 0752 {00101111103205 5117 0.010
11530 0003213222 1/4w 2.2K 04115 0004101141005 157 100 0005905 00511111011015 507 1000
5T0 011032131051 1/4w 111 0407 0004110431135 507 3. 30 01101.1102 700511022320 257 0.02207
fi27 01103213134 1/4w 33011 04011 0001151511155 507 1300 011031105 00511105210351 507 10000
7533, 534 71701103213102 1/4w 1K 0409 0004110140105 507 10 7 77
11535. 535 011032137521 1/4w 7. 511 0410 0051152211155 507 2200
0537 \01103213104 WV 10011 0411 00511010320 257 0.01707 7 7
71175357 7 7 01103215072 7 MW 111 0412 00511022375 257 0.0220 77 _
5530 01103213223 1/4777E1777 7 77 517177 77770074141433E7 107 3300 7
11540 .. 1011032131132 771/411 1711 04157 7&00511111521155 507 10000 7 7
11541 0503213522 1/40 5.25 0421 00511111521155 507 10000
11544545 01103213103 174w 10K 7 7 0501.502 77041114031135 507 3. 30
11540-551 0110321fi14 1/4w 100K 7 0503.504 005 113311155 507 3300 7777
11552 01103213102 1/4w 1K 5505.505 1005 1115035 507 150
11554555 1011032132227 71/4w 2.211 0507.500 00011027211115 157 27000 7
11701 1.111115111021120 7 1/411 2.2 A 0509510 1000411042525 507 2. 2117 77 77
11707277 7 01102107341171 1/4w 4.7 A 0511512 10051155211155 7 507 5207
E03, 704 01103213552 77 1/4w 5.511 0513 0004170470 357 74770
11705, 705 51101334710 1w 470 A 7 0514 1042411011105 1007 100 77
11770777 10110310735201 1 1/2w 77197 A 7 0515515 00511111114205 1 5707 0.10 7 7

728-