Seeburg USC-2 Troubleshooting

OK so to start off I have the service manual for the USC-1 & USC-2 supplement. I have the service manual for the DCC-2 and the TSA-10 Amp. I also now have the Microlog Trouble Shooting Guide

Currently my USC-2 will not scan when selections are made.
The select a single/album lights are lit (I have the program board out of the DTP-1)
The 1st & 2nd digit light come one after 2 selections, the 3rd key is selected and both lights go off. If you key an incorrect number like starting with 4 the re-set/re-select light does work.
The unit will scan manually using the Service Switch to engage the mech and the Pass Switch is set to No.
I have the DTP-1 inline along with the DRD-1.
I have a supposedly working TSA-10 in-line as well.

I was working off of Phono Procedure Chart #4 in the Microlog book.
I have not done everything in Point #1 but the off the Write Source I am receiving 127.1v when the unit is on. I have not had a chance to test the reaction time on power up or the multiple key selection test.
Point #3 I tested connecting pins #4,5,6 & 7 from J3104 Transmitter to the chassis, w/ test wire, and the mech did not scan on either pin but did move when Pin #8 was connected to the chassis, which was not in the manual (accidental).
I then tried connecting the same Pins (4-7) on the J3101 Receiver to the chassis and no movement of the chassis. (And yes I know the Pins are reversed on J3101 from J3014).
Since the mech did not scan, I followed the next steps, I used the Service Switch to scan and that worked, did not stop, scanned twice and stopped, and the Pass Switch is on No. I then connected Pin #15 from J3101 Receiver to the chassis and no mech movement.

It then basically states that if the mech does not scan the DCC is defective. Would this then be an issue with the Scan Board in the DCC-2?

Voltage Tests
J3101 Receiver
Pin 15 - 0v
Pin 14 - 131.3v
Pin 11 - -12.4v
Pin 10 - -25.2v
Pins 7-4 - -25.2v
Pin 1 - 0v

J3104 Transmitter
Pin 11 - -12.5v
Pin 10 - -25.4v
Pin 9 - 0v
Pins 8-4 - -25.3v
Pins 2-1 - 0v

Just as an FYI I tried replacing the 311143-3 scan board from my working DCC-4 and I have the same problems.

Also, I do have the correct 24v Trip Switch on the DCC-2 but I never see it engaged when I scan manually or manually tripping the mech release lever.

OK... So I have narrowed it down to a defective DRD-1 "Gray box". How I came to this conclusion Ron Rich's Seeburg Microlog Trouble Shooting Guide Phono Procedure Cart #4.
While testing the voltage on the Write Source, I am getting 132v while the J3101 (Blue Transmitter) is disconnected and reaction time while switching on an off the unit was very fast.
I reconnected the J3101 plug (Blue Transmitter) and retested the same voltage. The voltage level was 132v and the reaction time on and off was the same as when J3101 was disconnected.
So then I proceeded to apply multiple credits, I tried both removing the programming card from the DPT-1 for "Free" play & leaving the card in and adding multiple quarters, while pressing 111 on the keypad, the voltage dropped down from the normal 132v on the Write Source down to 4.5v and never returned after the 3rd number. I turned off the unit and back on, the voltage returned to 132v, I tried again pressing 111 and the voltage dropped to 4.5v and never returned.

First, Thank you Ron for writing the trouble shooting book as it is very helpful.

Second, off to find a new DRD-1 "Gray box", actually 2 as the SPS-2 I picked up needs a new one as well. That was easy to figure out as I could hear it rattle when I removed it from the mech. Figuring it was gone, I removed the cover and saw that someone had tried to remove and replace the cover and broke the board in 2 places. Hopefully I can find ones for under $50

Ron,
Glad it helped--One thing I think you missed, in the trouble shooting guide---the detent relay on a DCC-2, should NOT be a "24 volt" unit, unless the DCC has been modified. Ron Rich

I actually double checked, I miss spoke, I have the 12v Trip Switch in the DCC-2 and a 24v one in my DCC-4 (SPS-2).

Guy's,
In the last 6 or so months, I have seen 7 or 8, black/gray boxes, where some "Jepetto" has attempted to open one, and has been successful only in destroying it ! IF you are, going to "open" one, PURCHASE, and READ, the late, Tony Miller's "Black/Gray box book", FIRST ! Just "opening" them ( also un-plugging/ plugging in, with power ON), WILL destroy them !!
Ron Rich

Ron Rich wrote:Guy's,
In the last 6 or so months, I have seen 7 or 8, black/gray boxes, where some "Jepetto" has attempted to open one, and has been successful only in destroying it ! IF you are, going to "open" one, PURCHASE, and READ, the late, Tony Miller's "Black/Gray box book", FIRST ! Just "opening" them ( also un-plugging/ plugging in, with power ON), WILL destroy them !!
Ron Rich

Excellent advice, Ron!
The average person simply doesn't know about "static sensitive devices" in modern electronics.
The proper servicing techniques MUST be followed in order to do successful troubleshooting.
And, if you don't know HOW to perform these tests OR have the proper safegards and equipment - stay the heck out of things and let the experienced do the job.

I agree... I have worked in IT for 20 years and have a full understanding about static management while working on any chip based technology. I work on high end server structures and tell the young guys the same thing, if you dont know how to properly work on something, leave it in the static bag

Both of these DRD-1's were clearly opened and at least one of them was butchered beyond belief. It looks like when they tried to put the cover back on, they broke the board at the corners.

"A static bag" ?? Whats that ?? Actually, the black/gray boxes do not require one--the plastic the case is made, of fits that requirement--however, as soon as you "pop it open" all protection is lost. Ron Rich

Static bigs are a poly non-static bag that most if not all computer parts come from the Mfg. This way you can carry something around without worrying about a static discharge destroying the cips. Granted the technology today far surpasses what was in the 70's, uts hard to burn a chip these days just by static.