Question about RCA VR629HF VHS VCR
Need some advice on a vcr (power supply ?) problem, sure hope you can steer me right on it.
It’s an RCA model VR633HF, four head, nearly 8 years old. For over a month now, when I
try to turn it on (with a recording tape in the carriage) with either remote or the on/off switch, it begins
to bring the carriage up to the drum, then abruptly stops, upon which the LED display starts flashing,
with a ‘tick-tick-tick…’ sound occurring, synchronized with the LED flashes. It does this for some
3 – 5 minutes (no controls will stop it), then stops and shuts the unit off. Usually, if I turn it on again,
it starts, and every thing is normal, but sometimes I go through this THREE times to get the unit
on. When it does come on, the LED flickers a little, and the clock time must be reset. Strangely, with
a pre-programmed recording, it powers on fine, and the program is recorded, however, it still screws
up the clock after. I have tried pulling the plug (reset the cpu) several times, to no avail.
I asked a local service tech here about this problem, and he told me it was a defective power
supply ( the SMPS type), but didn’t tell me what in the circuit to look at. I don’t have the schematic/
service manual for the unit, I do have a DMM. Later I was told that the power supplies in these units
are enclosed and plug in to the main board, and from reading online, that the problem could be with
leaky/shorted diodes or filter capacitors in the rectification part of the circuit.
What specific components are defective here, and could you give me an idea what the circuit looks like,
so as to locate the parts, etc. ?
Thanx loads for your time, patience and help in this,
On vcr power supplies usually first component to go is a capacitor, check if its blown, or test it if you have a meter capable, next check diodes and resistors, also check the resistors and diodes on all the boards( they may have blown if a cap has blown) If there was smoke or a smell its usually a resistor to look for. When you replace them replace them with a higher votage cap.. Example 15v 1000uF cap with a 25v -35v 1000uF cap( this is just to avoid the problem from happening again.
Posted on Feb 01, 2009
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