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Author Topic: To attach playback heads to RCA output jacks on Otari Mx-5050 B2 2  (Read 7320 times)

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Offline YUL400

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Hello,

I am at the stage of locating the playback heads on my Otari MX-5050 B2 2 tape recorder. I'm trying to imagine which cables are attached to it. I believe that I have found where they connect to the internal electronics of the deck. From right to left there are orange, brown, red and yellow wires.

Any idea which one of these wires to attach to RCA output jacks I have added on the back panel of the deck ?

Thanks.
« Last Edit: November 29, 2014, 04:16:36 AM by YUL400 »

Offline Listens2tubes

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Re: To attach playback heads to RCA output jacks on Otari Mx-5050 B2 2
« Reply #1 on: December 01, 2014, 03:04:10 PM »
OKAY I have a WORD Doc that I made up from one of the Tape Project forum. I will say one thing before you read the following: I would take the leads off the head block plug and move the wires I disconnected to a pair of RCA sockets on the rear of the machine perhaps above the inputs. This is so you can take the wires going to your outboard preamp and plug them into he original deck's electronics to return it to it original state if desired.   Here's a copy and paste: Otari MX-5050-BII-2 tape head output modification:

These instructions assume the reader has the service manual for the Otari. My copy is Edition 8 dated October 1987.

Referring to the view in Figure 5-1 on page 5-2 lay the unit on its back, remove eight screws to remove the bottom plate and pull down the bottom panel providing access to the amplifier board, A10620B foldout, following page 10-1.

Using the circuit board diagram PB-16EB on page 8-3, locate terminal blocks 9, 13 and 14. They are numbered on the blocks. The pin numbers are located on the board next to the PCB-mounted male connectors. Note these numbers. Loosen the screw that attaches a ground wire at the right end of the chassis. Block 9 is the channel 1 and channel 2 connections from the heads. (follow these wires up to the head connections) Pin 4 is channel 1+, pin 1 is channel 2+, pins 2 and 3 are grounds.

Hope this helps.
« Last Edit: December 01, 2014, 03:07:20 PM by Listens2tubes »
Neal P.

Offline YUL400

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Re: To attach playback heads to RCA output jacks on Otari Mx-5050 B2 2
« Reply #2 on: December 02, 2014, 06:28:09 PM »
It helps a lot. I've finally turned on the Eros preamp and played some tapes. Everything works perfectly. The sound is very good and will improve gradually during the break in period. With a little bit of fine tuning it will be fantastic.

Thanks to Listens2tubes and Mr Joppa for your help.

Offline tfrei

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Re: To attach playback heads to RCA output jacks on Otari Mx-5050 B2 2
« Reply #3 on: March 07, 2016, 04:56:43 AM »
Thanks ListensToTubes for this.  I'm just now doing this for my Otari. 

Quick Question:  Why loosen the grounding screw to the repro panel?