Read Sharp DV-3761H (serv.man2) Technical Bulletin online
Sharp Electronics (UK) Ltd Technical Support Group
Originator ________ Supervisor_________ Approval Date ___/___/___ UK51902Y
Date :
21 December 1998
Model:
DV3770H
Ref No:
DV3770-003
Classification: Immediate
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
Subject : Counter measure for tuning drift
SYMPTOM Tuner drifting/patterning.
CAUSE
Narrow AFC range.
ACTION
1.
Add a resistor R227 (220
6 FW ) from the tuner AGC pin to ground.
2.
On the underside of the PWB add a IN4148 diode between pins 5 and 15 of IC201
(cathode to pin 5).
(cathode to pin 5).
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
220k
6 FW
VRD-RA2BE224J
AA
Diode
RH-DX0045BMZZ
AA
Display