Blues Junoir reverb dead

[Zouto]

Hi, first of all: ALL THE BEST FOR 2014 TO YOU!
I got a Blues Junior (built 2002,Rev.D) with a dead reverb. C34 (220uF/25V) of the -15V power supply rail was literally blown, also the internal wires of the reverb can's input were broken. So I replaced cap & can, put in an IC socket and replaced the chip with a brand new TL072. The reverb's output is working now, but the input is dead quiet, so still no reverb at all. Power supply (+/-15 Volts) for TL072 is ok, also the reverb cables from pcb to the can. So what to check next?
Thanks for help and hints,
Zouto

[soundguruman]

If you turn up the reverb control and shake the reverb springs, do you hear the springs rattling?
That confirms that the reverb output is working.
Take the reverb pan out and inspect the internal wires. Sometimes those little wires inside the pan can break.
Check across the reverb input jack with an ohm meter. The reverb pan input coil should show resistance.
The input coil can go bad...or the little wires to the coil can break off.
Also on the chassis, the RCA connectors on that plastic mount can have broken continuity.
If the wires get pulled too hard, that little plastic mounting plate with the RCA connectors can fail.
Also one more thing, check that the reverb pan is not hooked up backwards.
It is pretty common for the chassis RCA jacks to break continuity, or for the pan to be connected backwards.

[Zouto]

If you turn up the reverb control and shake the reverb springs, do you hear the springs rattling?
That confirms that the reverb output is working.
Take the reverb pan out and inspect the internal wires. Sometimes those little wires inside the pan can break.
Check across the reverb input jack with an ohm meter. The reverb pan input coil should show resistance.
The input coil can go bad...or the little wires to the coil can break off.
Also on the chassis, the RCA connectors on that plastic mount can have broken continuity.
If the wires get pulled too hard, that little plastic mounting plate with the RCA connectors can fail.
Also one more thing, check that the reverb pan is not hooked up backwards.
It is pretty common for the chassis RCA jacks to break continuity, or for the pan to be connected backwards.

Yeah, moving the pan, I hear the strings rattling, tapping the black reverb out RCA tip I get some hum, so the reverb output is working, all the reverb cables are fine, the reverb pan/can is replaced with a brand new same type TAD 8EB2C1B.
On the reverb input cable there's continuity between Pt.7 of TL072 and tip of the red RCA plug. Since the IC supply Voltages are ok, I'll check the IC's socket connections on pcb again for shorts or interruptions.

[soundguruman]

That is a good start.
That plastic plate on the chassis, with the reverb RCA jacks can fail.
You may have lost the ground connection between the RCA jack on the chassis, and the reverb pan input.
That plastic plate depends on metal to metal contacts, and this contact can bend and fail.
These little plates with the RCA jacks have an irritating habit of failing.
Use an ohm meter to make sure you have continuity all the way to the pan, on both tip and sleeve, separate,...with the pan disconnected.
Take your ohm meter, connect to the pan input only. Do you have resistance of the input coil?
Just because the pan is new, or the RCA chassis jacks look OK, does not mean you have a complete continuity all the way to the pan.

[Zouto]

Pan, cables and socket are ok, I'll check coupling caps next.

[Zouto]

Culprit found: R38 was out of specs, 11K instead of 68K, replaced it, reverb's fine now, especially with the much better sounding TAD 8EB2C1B can/pan.

[soundguruman]

Nice Job.