37VT-26H. Serivce manual page 1 to page 62 - Sharp TV Service Manual (repair manual)

37vt-26h service manual
Model
37VT-26H
Pages
62
Size
1.46 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / Serivce manual page 1 to page 62
File
37vt-26h.pdf
Date

Read Sharp 37VT-26H Service Manual online

1
37VT-26H(GY)
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user –  serviceable
parts inside. Refer servicing to qualified service personnel.
SERVICE MANUAL
S99P337VT26H/
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
MODEL
SERVICE MANUAL
TV/VCR COMBINATION TELEVIDEO
MODEL 37VT-26H(GY)
SHARP CORPORATION
37VT-26H(GY)
TV/VCR COMBINATION
TELEVIDEO
Chassis No. VP-8
37VT-26H(GY)
FEATURE
Ë
AIS (Automatic Instruction System)
Ë
ASS (Automatic Sorting System)
Ë
VPS/PDC (Video Program System / Program Delivery
Control)
Ë
FASTEXT
Ë
VIDEO Plus+
Ë
Post Cord Security
Ë
On Screen Digital Channel/Sound Level/Tuning Display,
Control (Contrast, Colour, Brightness, Tint, Sharpness,
White temp) Symbol and Level
Ë
Blue Back Off Timer
Ë
52 Key, Wireless Remote Control Unit
Ë
Channel Skip
Ë
High Speed and Double Speed Video Search System
»
PAL : 3 times/7 times (SP/LP)
»
NTSC : 3 times/5 times (SP/LP)
5 times/15 times (EP)
Ë
DPSS (Digital Program Search System)
Ë
Quick Start Playback with Full Loading System
Ë
Digital Automatic Tracking Control
Ë
Automatic Playback Function
Ë
AHC (Automatic Head Cleaning System)
Ë
Sharp Super Picture
Ë
345 Times Hi-Speed FF/REW
CONTENTS
Page
»
SPECIFICATIONS ................................................................................................................................................................................. 2
»
IMPORTANT SERVICE NOTES ............................................................................................................................................................ 3
»
LOCATION OF USER'S CONTROL ...................................................................................................................................................... 4
»
DISASSEMBLY AND REASSEMBLY .................................................................................................................................................... 6
»
ADJUSTMENT OF THE TV ELECTRICAL CIRCUITRY ........................................................................................................................ 9
»
PRECAUTIONS IN REASSEMBLING ................................................................................................................................................ 19
»
FUNCTION OF MAJOR MECHANICAL PARTS ................................................................................................................................. 20
»
ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ................................................................................. 22
»
ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY ................................................................................................................... 41
»
MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ............................................................................... 44
»
CHASSIS LAYOUT .............................................................................................................................................................................. 63
»
BLOCK DIAGRAM OF TV SECTION .................................................................................................................................................. 64
»
BLOCK DIAGRAM OF VCR SECTION ............................................................................................................................................... 66
»
DESCRIPTION OF SCHEMATIC DIAGRAM ...................................................................................................................................... 75
»
SOLID STATE DEVICE BASE DIAGRAM ........................................................................................................................................... 76
»
WAVEFORMS ..................................................................................................................................................................................... 77
»
SCHEMATIC DIAGRAM ...................................................................................................................................................................... 78
»
PRINTED WIRING BOARD ASSEMBLIES ......................................................................................................................................... 92
»
REPLACEMENT PARTS LIST ............................................................................................................................................................ 99
»
PACKING OF THE SET ..................................................................................................................................................................... 115
37VT-26H(GY)
2
SPECIFICATIONS
Ë
OUTLINE OF THE PRODUCT
Power Source:
220~240 V AC, 50 Hz
Power Consumption:
77 W
Receiving Broadcast Standard:
I
Receiving Channel:
VHF;
1A~S36
UHF;
S37~C57
Receiving System:
Sound;
6.0 MHz
Colour;
PAL
Antenna Input Impedance:
VHF/UHF; 75 ohm Unbalanced (DIN)
Video Signal:
Input;
0.5-2.0 Vp-p/75 ohm (SCART/RCA)
Output;
1.0 Vp-p/75 ohm (SCART)
Audio Signal:
Input;
0.5 Vrms/10k ohm (SCART/RCA)
Output;
0.5 Vrms/1k ohm (SCART) (54% MOD)
Temperature:
Operation;
5
°
C to 40
°
C
Storage;
-10
°
C to 60
°
C
Dimensions (Approx.):
378 mm (W) 
×
 387 mm (H) 
×
 384 mm (D)
Weight (Approx.):
12.7 kg
Cabinet Material:
Plastic
Accessories:
 Operation Manual
 Infrared Remote Control Unit
 Dry Batteries, Type AA (
×
2 pcs.)
Ë
TV SECTION
Viewing Area:
33.54 cm Diagonal Measurement
Picture Power:
22.0 kV at 800 
µ
A Beam Current
Speaker Output:
3.0 W at Max. (5
×
9 cm oval type 
×
1pc.)
Picture Tube:
Type;
VB370BVBK1S-S (Tint Tube)
Heater;
6.3 V, 300 mA
Focus;
High Bi-Potential Electrostatic
Ë
VCR SECTION
Outline:
VHS Video System Colour Video Cassette Recorder
Format:
VHS PAL/NTSC Standard
Video Recording System:
Rotary Slant Azimuth 2-Head Helical Scan System
Luminance:
FM Recording
Chrominance:
Low Frequency Converted Direct Recording
Video Signal System:
PAL/NTSC 3.58MHz Colour
Cassette Tape:
VHS Type Video Cassette Tape
Tape Width:
12.7 mm
Tape Speed:
PAL ;
23.39 mm/s (SP), 11.70 mm/s (LP)
NTSC ;
33.35 mm/s (SP), 16.68 mm/s (LP·PB only), 11.12 mm/s (EP)
Recording/Playback Time:
SP ;
Max. 240 min (with E-240)
LP ;
Max. 480 min (with E-240, PAL only)
EP ;
Max. 480 min (with T-160, NTSC only)
Number of Video Head:
4 pcs.
Note: The antenna must correspond to the new standard DIN 45325 (IEC 169-2) for combined UHF antenna with
75 ohm connector.
Specifications are subject to change without prior notice.
3
37VT-26H(GY)
IMPORTANT SERVICE NOTES
Maintenance and repair of this receiver should be done by qualified service
personnel only.
SERVICING OF HIGH VOLTAGE SYSTEM AND PIC-
TURE TUBE
When servicing the high voltage system, remove static charge from it by con-
necting a 10k ohm Resistor in series with an insulated wire (such as a test
probe) between picture tube dag and 2nd anode lead. (AC line cord should be
disconnected from AC outlet.)
1. Picture tube in this receiver employs integral implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging
the high voltage completely.
X-RAY
This receiver is designed so that any X-Ray radiation is kept to an absolute
minimum. Since certain malfunctions or servicing may produce potentially
hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:
1. When repairing the circuit, be sure not to increase the high voltage to more than 25.3 kV,
(at beam 0 
µ
A) for the set.
2. To keep the set in a normal operation, be sure to make it function on 22.0 kV + 1.5 kV – 2.0
kV (at beam 800 
µ
A) in the case of the set. The set has been factory – Adjusted to the
above-mentioned high voltage.
∴ 
If  there is a possibility that the high voltage fluctuates as a result of the repairs, never
forget to check for such high voltage after the work.
3. Do not substitute a picture tube with unauthorized types and/or brands which may cause
excess X-ray radiation.
BEFORE RETURNING THE RECEIVER
Before returning the receiver to the user, perform the following safety checks.
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulating fishpapers,
cabinet backs, adjustment and compartment covers or shields, isolation resistor-capac-
ity networks, mechanical insulators etc.
37VT-26H(GY)
4
LOCATION OF USER'S CONTROL
Page of 62
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Here you can read online and download Sharp 37VT-26H Service Manual in PDF. 37VT-26H service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp 37VT-26H CTR. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.