Sony SL-2710 User manual

SERVICE
MANUAL
3
ae
Canadian Model
BETA III/TI RECORD
BETAMI/II/I PLAYBACK
August, 1983 71 1 B CHASSIS
Refer to separate adjustment
SPECIFICATIONS manual, Part number 9-972-261-81,
System inputs and outputs
Video recording system Video input Phono jack (1)
Rotary two-head helical scanning 1 Vp-p 20.5 V pp, 76 ohms, unbalanced,
Audio recording system sync negative
Beta hi-fi system (2 channels) Video output Phono jack (1)
(Recording
on
the
conventional
audio
track
1
V
pp
40.5
V
p-p,
75
ohms,
unbalanced,
is monaural) sync negative
Video signal EIA standard, NTSC color Audio input Phono jacks (2)
Usable cassettes Cassettes having the mark [BD —10 dBs (0 dBs = 0.775 V rms), more than
(BM: 1.33 cmisec. 47 k ohms
[BM: 2.0 cmisec. Audio output Phono jacks (2)
[B1: 4.0 cmisec. {only for playback) -10 GBs (at load Impedance 47 k ohms)
Maximum recording time More than 10 k ohms:
TBM: 5 hours ‘Camera pause ‘Special minijack (1)
TBI: 3 hours 20 min. Mircophone input Minijack (1)
(with Sony L-830 cassette} ~60 dBs, for low-impedance microphone
Fast-forward and rewind time Headphone jack Stereo minijack (1)
Approx. 34% min. (L500) -26 dBs, 8 ohms
Audio frequency response
Beta hi-fi OFF
[BM : 50~-10,000 Hz — Continued on next page —
FRM: $0-7,000 Hz
Bata hi-fi MPX FILTER OFF
FBIL.BMI: 20 - 20,000 Hz
Wow and ftutter Beta hi-fi ON
Less than 0.005% WRMS
Dynamic range Beta hi-ti ON
More than 80 4B
Tuner section
Channel coverage VHF channels 2-13
UHF channels 14 - 83 Beta
CATV channels 1 - 99
(A-8 - W+58, See page 10.) VIDEO
VHF output signal Channel 3 or 4 (selectable)
75 ohms, unbalanced
Antenna 75-ohm antenna terminal for RF iN CASSETTE REC 0 RDER
ANTICABLE, TO CONV and AUX
"MICROFILM
|
S
O
N
Y
®

Timer section
Clock
Time indication
Timer setting
Quartz:iock system
42-hour cycle
Only to start and stop recording
9 programs can be set over 21 days at max.
Self-charging battery incorporated
Back-up duration: up to 60 minutes at one
time (after the battery has been charged at
least 40 hours.)
Power back up
General
Power requirements 120 V ac £10%, 60 Hz 20.5%
Power consumption 38 W (VCR)
50 W (max. with accessories)
AC outlet Unswitched max. 400 W
Operating temperature
5°C to 40°C (41°F to 104°F)
Storage temperature -20°C to +65°C (4°F to + 149°F)
Dimensions Approx. 430 x 105 x 375 mm (wihid)
(17 x 444 x 14% inches)
inct, projecting parts and controts
Weight Approx. 11.8 kg (26 Ib) net
Accessories supplied
Betamax video cassette tape...
7-ohm coaxial cable with F-type connectors (2 m,6 feet) .
Antenna connector EAC-25
Connecting cord RK-744
Remote Commander RMT-318 with two size AA batteries . wereracesy
Design and specifications subject to change without notice.
a aaa GN ST A NB SE Rn
MODEL !DENTIFICATION
— Specification Label —
US Model
MODEL_NO.
i103. G-Oeuess ie-yale)
VIDEO CASSETTE RECORDER
AG 120V 6OHz SOW
ECC. ID:AKB96ASL-2710
SONY CORPORATION
MADE IN JAPAN.
CE COMPLIES WITH FCC. RULES PART 15
RECEIVED. INCLUOING INTERFERENCE THAT MAY
CAUSE UNDESIRED OPERATION. 3-682-083
Canadian Model
EL.
SONYesetamar
VIDEO CASSETTE RECORDER
AC 120V 60 HZ SOW
MADE IN JAPAN
-084-01
SONY CORPORATION

SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
1, Check the area of your repair for unsoldered or
poorly-soldered connections, Check the entire
board surface for solder splashes and bridges.
2. Check the interboard wiring to ensure that no
wires are “pinched” or contact high-wattage
resistors.
3. Look for unauthorized replacement parts, par-
ticularly transistors, that were installed during a
previous repair. Point them out to the customer
and recommend their replacement.
4. Look for parts which, though functioning, show
obvious signs of deterioration. Point them out
to the customer and recommend their replace-
ment.
5. Check the line cord for cracks and abrasion.
Recommend the replacement of any such line
cord to the customer.
6, Check the B+ voltage to see it is at the values
specified,
7. Check the antenna terminals, metal trim,
“metallized” knobs, screws, and all other
exposed metal parts for AC leakage. Check
leakage as described below.
To Exposed Metal
Parts on Set
1 AC
O.15uF 1.5k2 |_£ | voltmeter
(0.75 V)
“= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARK
A\ ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION, REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR “IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
THAT ARE CRITICAL TO SAFE OPERATION ARE
IDENTIFIED IN THIS MANUAL. FOLLOW THESE PRO-
CEDURES WHENEVER CRITICAL COMPONENTS ARE
REPLACED OR IMPROPER OPERATION IS SUSPECTED.
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.S5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers’ instructions to use these instru-
ments.
A battery-operated AC milliammeter, The Data
Precision 245 digital multimeter is suitable for
this job.
Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly al] battery operated digital
multimeters that have.a 2V AC range are
suitable. (See Fig. A)
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UN TRAME ET
UNE MARQUE A\ SUR LES DIAGRAMMES SCHE-
MATIQUES, LES-VUES EXPLOSEES ET LA LISTE DES
PIECES SONT CRITIQUES POUR LA SECURITE DE
FONCTIONNEMENT. NE REMPLACER CES COMPO-
SANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS MANUEL OU DES
SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES
DU
IRCUIT QUI SONT CRITIQUES POUR LA SECU-
RITE DE FONCTIONNEMENT SONT IDENTIFIES DANS
CE MANUEL. SUIVRE LES PROCEDURES QUAND
LES COMPOSANTS Chi
QUES SONT REMPLACES
OU LE FONCTIONNEMENT IMPROPRE EST SUSPECTE.
—3—

TABLE OF CONTENTS
Section Title
1. GENERAL
1-1, Location and Function of Parts and Contrats . .
1-2, To Open/Ciose the Front Compartment... . .
1-3. New Full-Feature Beta Hi-Fi Video
Cassette Recorder.
1-4, Setting the Ciock .
1-5. How to Select TV Channels .
1-6, Programmable Antenna Switch .
4-7, Channel Presetting
4-8. How to Record TV Programs
1-9. FM Simulcast Recording. . .
1-10. How to Playback A Tape. . . ens
1-11, Selection of Playback Sound ......
4-12, Timer-Activeted Recording .......
1-13, Quick Timer Recording ........,
4-14, Recording Level Adjustment
1-15, Using the Time Counter . . wee ae
1-16. Dubbing Audio... 1 ee ee ee ee
1-17. To Start Recording from a Particular Point . . .
1-18, Tape Copy
4-19, Repair Method, for Hybrid Circuit Block .
1-20. Handling Precautions for MOS ICs. . .
2. DISASSEMBLY AND REPLACEMENT
2-4. Front Panel Removal... ....-5.5- wee
2-2, Pocket Block Assembly Removal. . . .
2-3, Power Block Removal... .
2-4, TI-1 Board Removal be
2-5, AU-6 Board Removal and AF-2 Board Check .
246, VI-2 Board Removal .
2.7, Timer Block Removal... . :
2-8. Inside Views. .......- bee eee eee
3, BLOCK DIAGRAMS
3+, Circuit Boards Location... 62... eee
3-2. Video System Block Diagram
3-3. Video Y Block Diagram .
3-4, Video Chroma Block. Diagram... . . .
3-5. System Contro! Block Diagram {1)....... +
3-6. System Control Block Diagram (2}......-.
Page
37
a
4
42
43
Section Title Page
3-7. System Control Circuit and Video Circuit
Inndbrtsce wre Sted aatevite sdsshied« caseetayaes 45
3-8. System Control Circuit and Servo Circuit
Writertiom sss ie-ysdic, costar yeckas At hg eanrery 46
3-9, System Control Circuit and Ree! Motor
Control Circuit Interface. 47
3-10. System Control Circuit and Mechanism Block
LRSEEDOM a: ie oles Groth ne oapa,a ype o ees 47
3-11, System Control Circuit and Its Peripheral
Circuit Interface... 2... oe ‘ tee 48
3-12, System Control Circuit and Audio Circuit
Interface... 49
3-13. System Control Circuit and Timer/Tuner
Circuit Interface, ee 49
3-44. Servo Block Diagram. 51
3-15. Capstan Phase System Timing Chart
(REC Mode)... ..... Tanda ted Eats 54
3-16. Capstan Phase System Timing Chart
(PB Mode}. cece cece cece e eens BS
3-17, Capstan Speed System Timing Chart. 55
3-18. Drum Phase System Timing Chart . . 56
3-19. Reiationship between Motor Speed and
PWM... ee eee Boon see 56
3-20. Drum Speed Phase System Timing Chart,.... 87
3-21, FG Circuit Timing Chart... 6.4.60. -6 5 58
3-22. PG-A, PG-B, PG-S Timing Chart. . : 59
3-23. PG-A, PG-S Timing Chart (REC/PB) 59
3-24. CTL Circuit Timing Chart... . . B 60
3-25. Pause Timing Chart........ 60
3-26. Audio Level Diagram. ......- 61
3-27. Audio Block Diagram (1) 6.4... oheaes 63
3-28. Audio Block Diagram (2)... . 65
3-29. Tuner Block Diagram... . . ier ae rane 67
3-30. Timer Block Diagram. 6... sree eee 69
3-31. Power Supply Block Diagram... 6.650 n

Section Title Page
4. SCHEMATIC DIAGRAM AND PRINTED
WIRING BOARDS
44, Fram Schematic Diagram ......-.-...-
4-2. HA-Sand Vi-2 Boards... . 6.0.0.0 -0006
43: RD-6, RD-9, $$-19, TR-11, LM-8, AU:
Ree! Motor and Capstan Motor Boatds. ... . .
4-4, FR-8, CS-3, CS-4, JK-5, N, 88:19 and S$-21
Boards... aera ¥
45, PK-2, PK-2, MJ-2,,AU-5, HP-4.and
RV-9 Boarday"s"; :
46. AF:2 Board "
47, TU44, TH, PK:
Boards 7203
48. PC-6, PC-7;,PC-8.and PC-1
4-9, Semiconductors. we
4-10, UHF/VHF Tuner Schematic Diagram .... ..
5, .EXPLODED VIEWS
5-1. Cabinet Assembly... .. . «
5-2, Front Panel Assembly .. . .
5-3. Timer Block Assembly. . . .
5-4. Power Block Assembly. . . .
5-5, Main Board Assembly... .
5:6. Front Loading Assembly. . .
5:7. Chassis Assembly (1). .
5-8. Chassis Assembly (2), .
5-9, Chassis Assembly (3) . .
5-10. Chassis Assembly (4) . .
5-11. Chassis Assembly (5) . .
5-12, Drum Assembly. . .
5-13, Chassis Assembly (6}
5:14, Reel Chassis Assembly .
5:15. Chassis Assembly (7). .
6. ELECTRICAL PARTS LIST........
REMOTE COMMANDER RMT-318:.
3.93
73
7
85
118.
123
Az
128
i

SECTION 1
GENERAL
1-1, LOCATION AND FUNCTION OF PARTS AND CONTROLS
Display window
Look-through window REMOTE SENSOR
Tuning compartment
Cassette compartment
and 4 EJECT button CHANNEL s
(AMIPM) buttons
POWER switch
and tamp
Channel number
buttons:
LEVEL contro!
HEADPHONES
jack
C
(clear)
button
RECORD switch and lamp
AUX (WEEK AFTER NEXT) button
Tape transport buttons
REC LEVEL control
RESET button PROGRAM SELECT button and lamp
TAPE RETURN button
Behind front panel
Beta hi-fi select switch
Audio track select switch TIMER SET button
BETA HI-FI switch
NEXT button
MIC jack
TIMER REC ON/OFF
REC MODE selector button
Input select switch
RACKING controi
DIMMER
switch’
QUICK
TIMER
button
DUB button BACK button
AEC
BALANCE
control’
i
CHECK button
CLOCK button

Rear panel
RF
OUT
terminal
‘MPX
(multiplex)
output
jack
AC
OUT
(outlet)
RF
IN
terminals
RF
UNIT
channel
select
switch
VIDEO IN/PCM IN
jack
VIDEO OUT/PCM OUT CAMERA PAUSE jack
jack
CAPTIONS/PCM switch.
AUDIO LINE IN jacks
AUDIO
LINE
OUT
jacks
SHARPNESS
controls:
=
1-2, TO OPEN/CLOSE THE FRONT COMPARTMENT
Teclose While pressing the side’ button,
To oper. 7 % < $ close the compartment.
Puil to open.
1-3. NEW FULL- -FEATURE BETA HI-Fl VIDEO CASSETTE RECORDER
High quality. sound ‘eproduction with low noise, minimum wow and flutter, wide dynariic range and. flat frequency
response is: possible thanks'to the Beta hi-ti recording system.
Look-through window, to observe
tape transport and the cassette
label.
Up to 169 channels {including
CATV channels) are selectable.
Easy selection of any channel
or of your favorite preset
channels, using the channel
number buttons or the —/+:
buttons.
You can easily locate any point
‘ona tape for repeat viewing of a
particular scene.
Space-saving
front loading
design.
Easy clockitimer setting
by using 10 channel
number buttons.
Double-speed picture
with double-speed sound
You are no longer restricted by
the TY program schedule.
Recording may be started at any
Noiseless
freeze
picture
time
within
3
weeks
(maximum),
Recording
of
smoother
and
9
pairs
of
turn-on
and
transitions
between
turn-off
times
can
be
set.
scenes
with
the
record
pause
function
You can enjoy stereo recorded tapes
and bilingual program tapes, selecting
the ianguage.
Manually adjustable
recording level
x You can add new audio
to a previously recorded tape.

1-4. SETTING THE CLOCK
The clock can be set with the power cord plugged in, even when the
power is not turned on.
, buttons and NEXT button
1 CLOCK button 2 Ghannet number
aN
im
3 C (clear) button
OFT TP) aan
® {y=
Example: To set the clock to 7:30 p.m. Monday.
J Press Look,
Ze
D os0t tne day of the week @ Press NEXT.
va
3 Press C (clear).
cs
A @Select AM or PM, and set the time, @ Press NEXT.
5 E>
The clock now starts operating,
showing the correct time,
AM 12:00... midnight
The upper dot blinks during the
first half and the lower during
the second half of each minute.
Brightness of the time display
To reduce the brightness of the time display, set the DIMMER
switch to DIM.
DIMMER

15, HOW TO SELECT TV CHANNELS
You
can
select
the
desired
channel
by
Pressing
the
appropriate
channel number.buttons, or by scanning higher or lower among the
prememorized channels with the CHANNEL —/+ buttons,
This recorder is preset at the factory to receive VHF channels 2
through 13 with the -/+ buttons. To add UHF channels or CATV
* channels, or to erase inactive channels see page 71.
WPnVeSTTIN
es
Using the -++ buttons
Present channel
For higher-numbered
channels, press the
+ button.
For lower-numbered
channels, press the
button,
Using the channel number buttons
For channels 1 through 9, press the 0 button first.
ex. 1: To select VHF channe! 7
ex.2) To select UHF channel 25
os
Mf
you
select
an
incorrect
tens-digit,
or
forget
to
first
press
0
for
channels
1
through
8,
wait
about
two
seconds
so
that
the
previous
number
display
Is
recalled,
or
press
the
C
button.
om

TO SELECT CATV CHANNELS
In addition to normal broadcast reception of VHF channels 2-13
and UHF channels 14 - 83, this recorder receives CATV channels.
To get the desired CATV channel, set the NORMALICATV selector
to CATY, refer to the following chart and select the corresponding
number on this recorder.
In the tuning compartment
OQ
df
Number on this recorder
NORMALICATY selector
> CATV
A-8 A-7 A-6 A-5 A-~4 A-3.8-2
Corresponding CATV channel
A? A 8B C D E F GH i]s Kot
a GO Bo Ge Eo 6 be ee Ee Be es es
MNO P @.R ST UV Ww [Wet weg]
AA BB
BHO EEA RMA & oe
WHS Wd WHS WHE WH? W+8 WHS We 10 W481 WH12 WHS W+I4 We 15)
CG OD EE FF GG HH U KK LL MM NN 00
a ee ee ee ee |
We18 WcT 7. Ws 10 We 19 W420 W+21 W422 WZ Ws Da W425 WwH26 W427 W+28)
88 TT UUW WW XxXyye zz
W220 W430 WH31 W432 W433 W946 WSS W436 WH37 W438 +99 We dO Wi 4t
pela AAR AR Lcd cla ot ttAaaiie Red Gal ti hdc nhtceoedhbbted
DReHMMAR RARE ee
Ws a2. Ws 43 W464. Wa WG Wed WH W449 W450 WHS We 52 W453 W454]
Ea ea EE
lW-+58 We56 W457 W458
Most CATV systems use letters to designate channels but some
use numbers. To tune In a numbered channel, select the same
number on the recorder.
Not all CATV channels fisted will be active on your particular
system. Check with your focal cable TV company or your nearest
Sony dealer for more comptete information on the available chan-
nels and the type of cable system.
4-6. PROGRAMMABLE ANTENNA SWITCH
You can preset this video cassette recorder to switch from direct
reception from the RF IN ANTIGABLE terminal to reception looped
through an optional captions decoder by using the AUX button on
the front control panel or on your Remote Commander.
CONNECTING A CAPTIONS DECODER FOR RECORDING CAP-
TIONED PROGRAMS
VHF/UHF antenna or
CATV 750hm
coaxial cable
Captions.
decoder
TO. PRESET THE OUTPUT’\CHANNEL OF THE . CAPTIONS ‘
DECODER
To receive captioned programs from the decoder connected to the
RF IN AUX terminal, select the output channel number of the
decoder, channel 3 or channet 4.
Press the AUX PRESET button.
Channel number “04” will blink in the display.
if the output channel of the decoder is channel 3, press the channel
number button 0 and 3 so that "03" blinks.in the display. If the out-
put channel of the decoder is’other than channels 3 or 4, follow the
procedure above and select the appropriate channel.
ees 10 sec:
preset
Channel 4 of
3 Is preset.
after 1 sec.
PE a
‘Once you preset, you can receive a captioned program. from the
AUX terminal by simply pressing the AUX button, whether the NOR.
MALICATY select switch is set to NORMAL or CATV.
The channel display wilt show “PP” (preset program).
CHANNEL
To receive a captioned program on the TV even when the recorder is
turned off, press the AUX button so that the “PP” will appear In the
display window.