Sharp 51AT15H Manual de servicio

Sharp Electronics (UK) Limited

Reference TB-T9905070

Revision 1

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 2

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 68kΩ(was

56kΩ)/R508

Fold over at the top of the frame Scanning coils (should read 9.9Ω)

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 below).

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 TB-T9905070

Revision 1

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 2

51AT15H Vertical Stage Schematic Diagram

REF NO DESCRIPTION PART NUMBER PRICE CODE

C501 Capacitor 220µf, 25V VCEAGA1EW227M AB

C502 Capacitor 100µF, 35V VCEAGA1VW107M AC

C514 Capacitor 220µF, 25V VCEAGA1EW227M AB

C713 Capacitor 1000µF, 16V 105oCVCEAHA1CN108M 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 33ΩSMD Source locally -

R520 56kΩor 68kΩ0.5WSource locally -

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