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CTV991207 TELEVISION TECHNICAL BULLETIN
Month of Issue: December 1999 Classification: White Page 1 of 1
MODELS
DV5105H
DV5107H
DV5132H
SYMPTOM Intermittent operation leading to any of the following symptoms. · · ·
·
Set starts up then shuts down with the LED red Set starts up then shuts down with the LED changing between red and green Set shuts down intermittently, normally when there is high beam current Intermittent start up - improves when warm
CAUSE ACTION
R751, R777, D751, D700, C756 and/or R612. The above faults are normally caused by R751 and R777 going high in resistance. Both of these resistors are 0.33 and go high by a few hundred milliohms, as most multimeters are unable to resolve resistances less than 1 it is advised to check by subsitution. In some cases, intermittent start up has been traced to D700 (HT rectifier), D751 (prefive volt rectifier) or C756 (smoothing capacitor). Once agian it is best to replace these components if in doubt. R612 is the supply feed resistor to the vertical stage. All sets should be modified so that a 1.2, 0.5W resistor is fitted in series with R612. To do this, replace wire link J13 with the resistor. Note that the HT supply should be 113VDC on a blue screen (pull the aerial out and wait a few minutes - the blue screen will appear due to lack of line sync).
REF NO R751 R777 D700 D751 C756 R612 J13
DESCRIPTION Resistor, 0.33R, 1W Resistor, 0.33R, 1W Diode Diode Capacitor 2200µF, 25V Resistor 2.2, 0.5W Resistor 1.2, 0.5W
PART NUMBER VRN-VV3ABR33J VRN-VV3ABR33J RH-DX0110CEZZ RH-DX0226CEZZ VCEAGH1EW228M RR-XZ0204BMZZ VRD-RA2HD1R2J
PRICE CODE AB AB AB AC AE AA AA
Sharp Electronics (UK) Limited
Reference AVW031299-2 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