The cap in question lies at the top of the pcb next to the 220k
if in doubt snip one end off
Alistair D wrote:The problem occurred after you replaced the open circuit 680k resistor. Lift one end of the replacement to see if the new fault has gone.
malcscott wrote:Almost any general purpose npn transistors will be ok.
Cathovisor wrote:Get some BC547s and BC557s Marc - good general purpose NPN and PNP devices with a reasonable voltage rating.
Mark Hennessy wrote:Beware of any transistor that looks like a BC148 - those "Lockfits" are notorious for causing trouble.
malcscott wrote:If the 1k has burnt up then the trip is o/c on both sections. The 1k, 2 x BC148 bcl transistors and the 1k bcl pot will be u/s. The .01mfd from the 220k to deck can be left out for testing as it only gives a shadow to the left of the raster if out of cct. If the 680k is left out of cct the the A1 volts will be unadjustable, Malc.
malcscott wrote:Does the bcl pot have an effect? Check A1 volts, Malc.
malcscott wrote:Try adjusting rv405 pre-set brill pot on t/b panel.
malcscott wrote:Check PL509 cathode volts as indicated in manual. With the colour turned off is it possible to get a grey scale?
malcscott wrote:Check ht volts to decoder pcb, also D407/D405 on t/b panel go leaky.
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