DOWNLOAD Sharp 51AT-15H (serv.man21) Service Manual ↓ Size: 76.56 KB | Pages: 4 in PDF or view online for FREE

Model
51AT-15H (serv.man21)
Pages
4 Few pages! See other manuals at the bottom of the first or last page.
Size
76.56 KB
Type
PDF
Document
Service Manual / Technical Bulletin
Brand
Device
TV / CTR / Countermeasures for various vertical stage problems. This Technical Bulletin includes vertical stage voltages and waveforms not given in the .
File
51at-15h-sm21.pdf
Date

Sharp 51AT-15H (serv.man21) Service Manual / Technical Bulletin ▷ View online

Sharp Electronics (UK) Limited
Reference JCJR070799
Revision  2
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV990704
Month of Issue: July 1999
        Classification:         White
TELEVISION TECHNICAL BULLETIN
Page 1 of 4
MODELS
51AT15H
SYMPTOM Vertical stage problems
ACTION
 Listed below are a few fault conditions and their suggested remedies
Fault
Counter measure
Output transistors running hot
R508 high or open circuit
No front button operation
D506 leaky
Will not come out of standby 
R508 open circuit
Top of frame distorted
C501 and/or C514
Too much height
Change R520 to 68k
 (was
56k
) or R508
Fold over at the top of the frame
Scanning coils (should read 9.9
)
Cramping (top or bottom)
D709, C713 and check all
semiconductors in vertical stage
Loss of picture (may be intermittent)
D504 and/or C502 leaky
Notes
1. When replacing semiconductors in the vertical output stage, it is strongly recommended that all parts are purchased
from the Sharp Spare Parts Center or Willow Vale Electronics using the part numbers in the service manual
(reproduced on page two).
2. C713 must be replaced with a high temperature type (use the part number given on page two).
3. Always check the +5Vb line fed into the bias network of Q507.  If Q708 (+5Vb regulator/switch) goes leaky it may
cause intermittent operation problems, but the fault symptom appears to be the vertical stage.
4. If the vertical pulse to the microprocessor is missing or distorted (pin 46 of IC1001), then the key scan will not work.
5. Q509 must be the correct device.
6. When R508 is open circuit, both vertical output transistors turn on, thus overloading the power supply.  This can
cause the power supply to buzz.
7. Q503 (BC828) may be a BD830 supplied as an alternative under part number RH-TX0204BMZZ.
8. Q509 (BC635) may be supplied under an alternative part number – RH-TX0118BMZZ.  This is an identical device.
Sharp Electronics (UK) Limited
Reference JCJR070799
Revision  2
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV990704
Month of Issue: July 1999
        Classification:         White
TELEVISION TECHNICAL BULLETIN
Page 2 of 4
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
C501
Capacitor 220
µ
F, 25V
VCEAGA1EW227M
AB
C502
Capacitor 100
µ
F, 35V
VCEAGA1VW107M
AC
C514
Capacitor 220
µ
F, 25V
VCEAGA1EW227M
AB
C713
Capacitor 1000
µ
F, 16V 105
o
C
VCEAHA1CN108M
AD
D504
Diode, 1N4148
RH-DX0045BMZZ
AA
D506
Diode, BZX79C5V1
RH-EX0408BMZZ
AB
D709
Diode, 1N4935
RH-DX0529BMZZ
AB
Q502
Transistor, BD825-16
RH-TX0140BMZZ
AE
Q503
Transistor, BC856
RH-TX0153BMZZ
AB
Q504
Transistor, BD828
RH-TX0141BMZZ
AC
Q505
Transistor, BC546
RH-TX0154BMZZ
AA
Q506
Transistor, BC846
RH-TX0152BMZZ
AA
Q507
Transistor, 2SA1037
VS2SC1037KQ-1
AA
Q508
Transistor, BC557
RH-TX0143BMZZ
AA
Q509
Transistor, BC635
RH-TX0108BMZZ
AC
R508
33
 SMD
Source locally
-
R520
56k
 or 68k
  0.5W
Source locally
-
Sharp Electronics (UK) Limited
Reference JCJR070799
Revision  2
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV990704
Month of Issue: July 1999
        Classification:         White
TELEVISION TECHNICAL BULLETIN
Page 3 of 4
51AT15H Vertical Stage Schematic Diagram
Reference
Type
Location
Collector
Base
Emitter
Q502
BD824-16
Component Side
11.5V
1.2V
0.7V
Q503
BC856
Print Side
-1.2V
0.3V
1.1V
Q504
BD828
Component Side
-11.2V
0.4V
0.2V
Q505
BC546
Component Side
0.0V
-12.6V
-13.0V
Q506
BC846
Print Side
0.0V
-12.0V
-12.5V
Q507
2SA1037
Print Side
-12.0V
1.5V
2.0V
Q508
BC557
Component Side
-13.0V
1.3V
2.0V
Q509
BC635
Component Side
11.1V
-11.9V
-11.3V
Q510
BC338
Component Side
-11.9V
-12.4V
-13.0V
51AT15H Vertical Stage Typical Voltages
Sharp Electronics (UK) Limited
Reference JCJR070799
Revision  2
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
CTV990704
Month of Issue: July 1999
        Classification:         White
TELEVISION TECHNICAL BULLETIN
Page 4 of 4
Typical 51AT15H Vertical Stage Waveforms
Display

Sharp 51AT-15H (serv.man21) Service Manual / Technical Bulletin ▷ Download

  • DOWNLOAD Sharp 51AT-15H (serv.man21) Service Manual ↓ Size: 76.56 KB | Pages: 4 in PDF or view online for FREE
  • Here you can View online or download the Service Manual / Technical Bulletin for the Sharp 51AT-15H (serv.man21) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp 51AT-15H (serv.man21) CTR. Information contained in Sharp 51AT-15H (serv.man21) Service Manual / Technical Bulletin (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.