WB4TUR 2/12/2000

GE Master Pro BASE STATION POWER SUPPLY:

4EP38A10 (FBI special SPL-X002-43854411 with integral test set and control)

[#] = numbered wire label in chassis between TB501/502 and TB70X

TB501-

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TB501-1 +18V unreg (on 4EP38A12 only)

TB501-2 f4 tx (P101-18) [19] [31]

TB501-3 f3 tx (P101-17) [18] [30] ???

TB501-4 f2 tx (P101-16) [17] [29] ???

TB501-5 f1 tx (P101-12) [16] [28] TIE LOW TO TB501-11

TB501-6 xmtr channel guard (+10V to special encoder) (P101-14)

TB501-7 +10 VDC [13]

TB501-8 +12.6 VDC (P443-11) [32] [23] ??

TB501-9 +12.6 VDC (same) [14]

TB501-10 interlock [32]

TB501-11 ground [21]

TB501-12 ground [22] ??? [10]

TB501-14 Squelch [27] ???

TB501-15 external rx mute and xtmr light [24]

TB501-16 duplex (see note 2)

note 2: for duplex, move N24 W-R wire from TB501-16 to TB501-7 (+10)

TB502-

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TB502-1 audio coupler low SHIELD [8] ???

TB502-2 audio coupler high (P443-5 RX VOL) [9] ???

TB502-3 shield (on 4EP38A12)

TB502-4 tone encoder hi (on 4EP38A12) [9] ???

TB502-5 voice coil high (TB4-1 or TB503-5 earpiece audio output) [20]

TB502-6 f4 rx (P443-9) [23]??? [35]

TB502-7 f3 rx (P443-8) [22] [34]

TB502-8 f2 rx (P443-7 [21] [33]

TB502-9 f1 rx (P443-6) TIE to +10VDC TB501-7

TB502-10 PTT (P101-7) [70] [32] [4]

TB502-11 channel guard monitor (P443-18) Ground to enable PL

TB502-12 audio hi (A501-H26) TX AUDIO INPUT SIGNAL [2]

TB502-13 audio lo (A501-H27) TX AUDIO INPUT GND [1]

TB502-14 117 VAC hi [29]

TB502-15 117 VAC lo [28]

TB502-16 COS feed (P443-19) [12]

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