MX-5050 MK III Series to BTX Shadow

Three diagrams, one for each kind of MX-5050 MK III series transport: machines with no locator connector, machines with the 16-pin locator connector, and machines with the 34-pin locator connector. The first two include the BQ-II. Each wires the machine to the transport control connector of a BTX Shadow synchronizer.

MACHINES WITH NO LOCATOR CONNECTOR INCLUDING BQ-II↑ TOP

⤢ zoomMX-5050 MK III Series to BTX Shadow, machines with no locator connector including BQ-II: points on the transport control PCB wired to the BTX Shadow transport control connector, full page scan of page 3

Download the traced vector PDF

Shadow pin	Shadow signal	Transport control PCB	Joined on the diagram to
20	CONTROL SUPPLY	+5VDC C127+	44, 2, 1
44	TALLY SUPPLY	—	20, 2, 1
15	STOP COMMON	—	21
31	STOP TALLY	STOP TALLY IC28 PIN12	—
3	REC COMMON	—	14
7	F.FWD TALLY	F.FWD TALLY IC1 PIN7	—
17	F.FWD COMMAND	F.FWD SWITCH CONN MW PIN2	—
32	REW TALLY	REW TALLY IC1 PIN6	—
40	STOP COMMAND	STOP SWITCH CONN MW PIN1	—
6	PLAY TALLY	PLAY TALLY IC1 PIN2	—
43	REW COMMAND	REW SWITCH CONN MW PIN3	—
2	DIR+	—	20, 44, 1
14	PLAY COMMAND	PLAY SWITCH CONN MW PIN4	3
27	DIR-	FWD/REV IC30 PIN5	—
21	SYSTEM GROUND	GROUND C127-	15
1	TACH +	—	20, 44, 2
28	REC COMMAND	REC SWITCH CONN MW PIN5	—
26	TACH -	TACH COLLECTOR Q12	—
36	BYPASS (N.C.)	* FROM VARI SPEED SWITCH ORIGINALLY ON PIN4 OF CAPSTAN SERVO PCB	—
11	BYPASS (N.O.)	—	9
9	SERVO VOLT 1X	—	11
35	BYPASS (COM)	* CAPSTAN SERVO PCB PIN4	—

NOTES:

1. TO IMPROVE CAPSTAN LOCK-UP PERFORMANCE, JUMPER R34 (1K) WITH A 100 OHM 1/4WATT RESISTOR ON THE MOTHER PCB OF THE SHADOW MAINFRAME

*2. WITH NO SYNCHRONIZER CONNECTED, JUMPER THESE POINTS FOR NORMAL CAPSTAN SPEED

MACHINES WITH 16 PIN LOCATOR CONNECTOR INCLUDING BQ-II↑ TOP

⤢ zoomMX-5050 MK III Series to BTX Shadow, machines with 16 pin locator connector including BQ-II: locator connector pins wired to the BTX Shadow transport control connector, with four tally wires moved on the transport control PCB, full page scan of page 4

Download the traced vector PDF

Shadow pin	Shadow signal	Locator connector	Joined on the diagram to
20	CONTROL SUPPLY	+5VDC [16]	44, 2, 1
44	TALLY SUPPLY	—	20, 2, 1
15	STOP COMMON	—	21
31	STOP TALLY	*STOP TALLY [6]	—
3	REC COMMON	—	14
7	F.FWD TALLY	*F.FWD TALLY [7]	—
17	F.FWD COMMAND	F.FWD SWITCH [11]	—
32	REW TALLY	*REW TALLY [8]	—
40	STOP COMMAND	STOP SWITCH [14]	—
6	PLAY TALLY	*PLAY TALLY [9]	—
43	REW COMMAND	REW SWITCH [12]	—
2	DIR+	—	20, 44, 1
14	PLAY COMMAND	PLAY SWITCH [13]	3
27	DIR-	FWD/REV [4]	—
21	SYSTEM GROUND	GROUND [5]	15
1	TACH +	—	20, 44, 2
28	REC COMMAND	REC SWITCH [10]	—
26	TACH -	TACH [3]	—
36	BYPASS (N.C.)	SERVO COM [1]	—
11	BYPASS (N.O.)	—	9
9	SERVO VOLT 1X	—	11
35	BYPASS (COM)	EXT DC IN [2]	—

TRANSPORT CONTROL PCB	LOCATOR CONNECTOR PIN NO.
IC28 PIN12	6
IC1 PIN7	7
IC1 PIN6	8
IC1 PIN2	9

* REMOVE AND INSULATE THE EXISTING WIRES TO THESE PINS ADD NEW WIRES TO PINS 6, 7, 8, 9 AS SHOWN

MACHINES HAVING 34 PIN LOCATOR CONNECTOR↑ TOP

⤢ zoomMX-5050 MK III Series to BTX Shadow, machines having 34 pin locator connector: locator connector pins wired to the BTX Shadow transport control connector, full page scan of page 5

Download the traced vector PDF

Shadow pin	Shadow signal	Locator connector	Joined on the diagram to
20	CONTROL SUPPLY	* +5VDC [24]	44, 2, 1
44	TALLY SUPPLY	—	20, 2, 1
15	STOP COMMON	—	21
31	STOP TALLY	STOP TALLY [32]	—
3	REC COMMON	—	14
7	F.FWD TALLY	F.FWD TALLY [30]	—
17	F.FWD COMMAND	F.FWD SWITCH [2]	—
32	REW TALLY	REW TALLY [29]	—
40	STOP COMMAND	STOP SWITCH [1]	—
6	PLAY TALLY	PLAY TALLY [31]	—
43	REW COMMAND	REW SWITCH [3]	—
2	DIR+	—	20, 44, 1
14	PLAY COMMAND	PLAY SWITCH [4]	3
27	DIR-	FWD/REV [18]	—
21	SYSTEM GROUND	GROUND [25]	15
1	TACH +	—	20, 44, 2
28	REC COMMAND	REC SWITCH [5]	—
26	TACH -	TACH [19]	—
36	BYPASS (N.C.)	SERVO COM [21]	—
11	BYPASS (N.O.)	—	9
9	SERVO VOLT 1X	—	11
35	BYPASS (COM)	EXT DC IN [20]	—

* EARLY MACHINES WITH 34 PIN CONNECTORS DID NOT HAVE +5VDC ON PIN 24 ADD A WIRE FROM PIN 24 TO CONTROL PCB CONNECTOR MK PIN 2