Table 7-5. Troubleshooting Monitor Control Panel SB-2600/G

TM 32-5895-227-14&P

units, connectors, switches, relays, and associated

7-10 TROUBLESHOOTING SB-2600/G.

wiring.

a. General. Perform the procedures indicated

(3) A single-station position requires pin-to-

below for sectionalizing, localizing, and isolating trouble

pin wiring on MX-7142/G as shown in figure 6-4 and is

to a particular circuit in the Monitor Control Panel SB-

similar to the connector wiring in figure 6-4.

2600/G (MWO 32-5895-227-15-1).

(4) A multistation position requires wiring on

b. Diagrams.

MX-7143/G as shown in figure 6-4 and is similar to

(1) The recorder (monitor and control)

connector wiring in figure 6-4.

position is shown in figure 7-6. This cable diagram

indicates the proper connector cabling required to

c. Troubleshooting Chart. Table 7-5 lists the

perform maintenance functions established with the SB-

trouble symptoms, the probable troubles, and the

2600/G.

corrective actions to be taken.

(2) The wiring diagram for the SB-2600/G is

shown in FO-8. This diagram indicates a complete

electrical means of performing maintenance on this unit.

It consists of power supplies, audio volume compression

Table 7-5. Troubleshooting Monitor Control Panel SB-2600/G

Item

Trouble symptom

Probable trouble

Corrective action

number

No power indication.

Burnt fuse

Check fuse F-1 located at rear of

SB-2600/G. Remove and replace

defective fuse.

Defective PS2

Refer to FO-8. Check 115 Vac input at

TB-5. Check for 24 Vdc at positive side

of 2C2. If no output, power supply is

defective. Remove and replace faulty

PS2 component as required.

RCVR 1 and RCVR 2

Defective power supply PSI

Refer to FO-8. Check 115 Vac input at

monitor positions

TB-5. Check for 26 Vdc at positive side

inoperative.

of C3. If no output, power supply is

defective. Remove and replace faulty

PS1 component as required.

Defective amplifiers No. 1 and No. 2

Interchange amplifier No. 3, No. 4, or

No. 5 with defective positions. Remove

and replace faulty component on

amplifier.

Inability to monitor

Defective monitor switch (S1) or (S2)

With monitor switch held in closed posi-

RCVR I or RCVR 2.

tion, check for 24 Vdc at switch holding

coil. With 20 Vdc not present and coil

deenergized, switch is defective.

Remove and replace switch.

Indicators do not

Burnt-out indicator light

Remove and replace bulb, as required.

operate.

Defective PS2

Refer to FO-8. Check 115 Vac input to

power supply. Then, check for 24 Vdc at

output (+) side of 2C2. If no output,

power supply is defective. Remove and

replace faulty PS2 components as

required.

7-17