Sony tc wr 870 service manual
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Page 1
remain/wine
SERVICE MANUAL
Photo: TC-WR87O
US Model
Canadian Model
E Model
TC- WR9 7ES
AEP Model
UK Model
TC- WR8 70
Model Name Using Similar Mechanism TC-WRBZO
Tape Transport Mechanism Type ngfigoom
SPECIFICATIONS
Recording system 4~track 2~channel stereo Outputs
2?: Winding time 232?;- 90 sec- (W'm SW 06° 5) Line outputs Rated output level 0.32 V at a toad
Signal-tomoise ratio (at peak level) (phono Jacks) 2?:sz 0
Dolb NR switch ,
0 TL..- OFF BType ON C-Type ON Load impedance Over 10 k ohms
asse e Headphones Output level 0-125 mW at a toad
TV IV (stereo phone jack) impedance of 32 ohms
(Sony METAL-8LT) 59 dB 67 dB 74 (18
Type it (Sony UX-S) 53 dB as as 73 dB General . '
Ty p9 t (Sony HF-S) 56 dB 64 dB 71 dB Power requtrements US, Canadian Model.
Total harmonic distortion 1.0% (with Sony METAL-8LT cassettes)
Frequency response (DOLBY NR OFF)
Type IV cassette
20 - 20,000 Hz (i3 dB, IEC)
(Sony METAL-8LT) 30 - 15,000 H2 (:3 dB OVU(~4 dB)recording]
Type ll cassette 25 _ 17 00 H + 8
(Sony UX-S) , 0 z(_3d ,IEC)
Type I cassette _
(Sony HFvS) 25 16.000 Hz (13 dB, IEC)
Wow and flutter $00970 W.Peak (EC)
006% WFIMS (NAB)
:0.16% WtPeak (DIN)
Inputs
Line inputs Sensitivity 775 mV
(phono jacks) Input impedance 47 k ohms
MICROFILM
Power consumption
Dimensions
Weig ht
Supplied accessory
120 V AC. 80 Hz
AEP. Germany Model:
220 - 230 V AC, 50/80 Hz
UK Model: 240 V AC. 50 Hz
E Model: 1204 220, 240 V AC
adiustable. 50/80 Hz
30 W
Approx. 470 x 135 x 355 mm (w/h/d)
(185/: x 53in x 14 inches)
including projecting parts and controls
Approx. 7.5 kg (16 lbs 9 oz)
Audio connecting cords (2)
Design and specifications subiect to change without notice.
STEREO CASSETTE DECK
SONY;
Page 2
TG5W397ESMR87O .
TABLE OF CONTENTS
m 11116. Page
Specifications .................................. 1
Model Identification . . . 2
Safety Check-out .............................. 2
1. GENERAL
Identification of Front Panel Parts ----------- 3
Connections ........................... . . 4
2. DISASSEMBLY - - - 5
3. ADJUSTMENTS
3-1. Mechanicgl Adjustments ................... 8
3-2. Electrical Adjustment ..................... 8
4. DIAGRAMS
4.1, BlockDiagram ........................ ,.. 12
4-2. Printed Wiring Boards -
4.3. Sahematic Diagram ....................... 21
5. EXPLODED VIEWS .................... 29
6. ELECTRICAL PART S LIST ------------ 33
MODEL IDENTIFICATION
- Specification Label ~
TC-WR97ES
TC-WRB'IO
MODEL N0. WM
STEREO CASSE1TE DECK
SERIAL Nor
MADE IN JAPAN
US. Canadian Model: AC: 120V (5on saw
Germany, AEP Models: AC: 220 - 230V~50l60 Hz
UK Model: AC: 240 V~50 Hz
E Model: AC: 120. 220, 240 V~50/60 Hz 30W
SA FETV-RELATED COMPONENT WARNING"
COMPONENTS IDENTIFIED 3v MARK A on DOTTED
LINE WITH MARK A on THE scIIEMATIc DIAGRAMs
AND IN THE PARTS LIsT ARE CRITICAL To SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
soNv PAR-rs wuosE PA'ITT NUMBERS APPEAR As
~_sHowNIN =TIIIs MANUAL on IN SUPPLEMENTS we
~LIsnED av souv.
SAFETY CHECK~OUT
After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:
Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage, Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods.
I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers instructions to use these instru-
ments.
2. A batteryoperated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The limit" indication is 0A7SV, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63'lrd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have 2 2V AC range are
suitable. (See Fig. A)
Ta Exposed Metal
Part: on Set
AC
0.151.»? 1.5 kn / voltmeter
I0. 75 V)
1.5 Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
ATTENTION AUCOMPOISANT AVANT RAPPORT
A LA SECURITEI
LE8 COMPOSANTS IDENTIFIES PAR UNE MAHOUE A
sun LEs DIAcaAMMEs scuEMATIoues ET LA mm
03 PIECEs s0NT CRITIQUES Poun LA sécumTE
DE FONCTIONNEMENT. NE REMPLACER cEs coM-
rosst ouE mm on pIEcEs sonv DoNT LES
NUMéRos soNT DDNNEs DANS CE MANUEL ou
DANS LES supPLEMENTs PUBLIES PAR souv.