Hi, does anyone have a copy of the circuit diagram for an HMV Monaco record player. The unit I have has very low audio output and I need to fix it.

Cheers
Scott

Model C7-8E from 1966 with these semiconductors: SE4010, AY1108, AC187, AC188, AS25.

Shown here, but alas no schematic: http://www.radiomuseum.org/r/hismasters_monaco_c7_8e.html

Thanks GTC, I saw that pic and yes, no schematic. As I said it works, but very low volume. You reckon it could be any of the caps - I assume the transistors are ok given there is some signal

Any original caps, especially electrolytics, from1966 would be well past their use-by date, even though they may still appear to be be good.

Usual procedure is to check power supply voltages, then work backwards from the speaker, injecting a signal.

The cartridge may well be cactus. Might even be as simple as a bad/corroded connection. Shouldn't be too hard to find the cause of the attenuation.

Ducon branded electolytics & Ducon Red Caps are the biggest culprits for faults in 1960's Australian made solid-state gear. All Red Caps should be replaced as a matter of course.

If that fails, I'd turn my attention to the cartridge.

HMV H5-8E, JF-8E, C7-8E, U2-8E Service Manual

There are two things in 60's sets that I am finding causing volume issues. Yes! to electrolytics these were used as coupling caps & dry out. The others are some small axial caps around 1/4" x 3/8" of similar values to the old wax paper type & are equally as reliable (not). Some of the Ceramics were also a worry and I am also finding Germanium Oscillator transistors failing.

Also check resistors and for the common dry joint (cracks on printed circuits).

Thanks guys, re the cartridge, when I unplug it, I get the low signal. When its re connected there is no signal at all.
Will replace the electro caps and check the rest.

Hopefully a schematic turns up to so I can at least check volts etc.

Cheers
Scott

Service manual uploaded to post #5.

Thanks guys - much appreciated.