28JW-74H (serv.man12). Notes on Schematic diagrams and waveforms - Sharp TV Service Manual (repair manual)

28jw-74h (serv.man12) service manual
Model
28JW-74H (serv.man12)
Pages
3 Few pages! See other manuals at the bottom of the first or last page.
Size
243.92 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / Notes on Schematic diagrams and waveforms
File
28jw-74h-sm12.pdf
Date

Read Sharp 28JW-74H (serv.man12) Service Manual online

36
28JW-74H
Waveform Measurement Condition:
1. Test Equipment: DIGITAL SLPE LECROY.
2. Test Conditions: CH-12;  COLOUR BARS; 70dB FROM RF INPUT
3. TV  Condition: PICTURE AND AUDIO : SETTINGS !"FACTORY PRESETS
DESCRIPTION OF SCHEMATIC DIAGRAMS
!
Pin1 Vp-p= 2.5V
Pin2 Vp-p= 2.8V
1
2
3
Waveform:
Pin3 Vp-p= 2.4V
NOTE:
1. The unit of resistance « ohm »is omitted (K=1000
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are 
µ
F, unless otherwise noted
(P= 
µµ
F).
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE (           )   IS
DIRECTLY CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISO-
LATING TRANSFORMER BETWEEN TV RECEIVER
AND AC LINE TO ELIMINATE HAZARD OF ELECTRIC
SHOCK.
CAUTION
This circuit diagram is original one, therefore
there may be slight difference from yours.
SAFETY NOTE:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD
BE REGARDED AS POTENTIAL SHOCK HAZ-
ARDS WHEN THE CHASSIS IS OPERATING.
IMPORTANT SAFETY NOTE:
PARTS MARKED WITH  «
»  (
 
                      
)
ARE IMPORTANT FOR MAINTAINING THE
SAFETY OF THE SET. BE SURE TO REPLACE
THESE PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORM-
ANCE OF THE SET.
37
28JW-74H
Pin4 Vp-p= 80V
Pin5 Vp-p= 90V
Pin6 Vp-p= 80V
Pin7 Vp-p= 0.8V
Pin8 Vp-p= 225V
Pin9 Vp-p=1200V
Pin10 Vp-p= 0.5V
Pin11 Vp-p= 1.8V
Pin12 Vp-p= 0.5V
Pin13 Vp-p=5.6V
Pin15 Vp-p= 0.9V
  13
  14
  15
4
5
6
7
8
9
  10
  11
  12
Pin14 Vp-p= 58V
38
28JW-74H
Pin16 Vp-p= 9.2V
Pin17 Vp-p= 0.24V
Pin18 Vp-p= 9.6V
Pin19 Vp-p= 0.2V
Pin20 Vp-p= 9.2V
Pin21 Vp-p= 1.4V
Pin22  Vp-p= 1.4V
Pin23 Vp-p= 0.7V
Pin24 Vp-p= 500V
16
17
18
19
20
21
  22
  23
  24
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Here you can read online and download Sharp 28JW-74H (serv.man12) Service Manual in PDF. 28JW-74H (serv.man12) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp 28JW-74H (serv.man12) 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.