Power Supply and Bite Voltages. (Not Modified Circuit).

TB 55-4920-428-35

9. Power Supply and Bite Voltages. (Not Modified Circuit).

a. Performance Check.

(1) Set TI POWER switch to OFF.

(2) Connect digital multimeter (A4) leads (B6) to the TI terminal board TB 4-10 (HI) and 5 (LOW)

(3) Set digital multimeter RANGE switches to 50 vdc.

(4) Set TI POWER to ON.

(5) Digital multimeter will indicate between 27.5 and 28.5 vdc. If not, perform b(1) below as shown in

(6) Set TI SYSTEM SELECT to SAS1 and LINK TEST to CROSS FDBK. Observe TI DVM for an in-

dication of 00.00 +00.01. If not, perform b(2) below.

(7) Set TI POWER to OFF.

(8) Disconnect digital multimeter lead from TI terminal board TB 4-10 (HI) and reconnect to TB 4-

8(HI).

(9) Set TI POWER to ON.

(10) Digital multimeter will indicate between -19.0 and -21.00 vdc. Record reading.

(11) Position TI controls as listed from (a) and (b) below:

(a) SYSTEM SELECT to BITE.

(b) BITE to -20 v position.

(12) TI DVM will indicate the reading within ±00.01 of the digital multimeter reading recorded in step

(10) above. If not, perform b(3) below.

(13) Set TI POWER to OFF.

(14) Disconnect digital multimeter lead from TI terminal board TB 4-8 (HI) and reconnect to TB 4-

9 (HI).

(15) Set TI BITE to +20 v position.

(16) Set TI POWER on ON.

(17) Digital multimeter will indicate between 19 and 21 vdc. Observe indication on TI DVM between

19.00 and 21.00.

(18) Set TI POWER to OFF.

(19) Disconnect digital multimeter lead from TI terminal board TB 4-9 (HI) and reconnect to TB 4-12

(HI).

(20) Set TI POWER to ON.