IBM 5110 Series Maintenance Analysis Procedures page 225

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Manual Call MAP for
World Trade 38LS
PAGE 3 OF 4
015
- Keep the handset off hook.
- Connect a jumper from C2B02 (-Data Terminal
Ready) to C2D08.
Is the associated telephone set disconnected
from the line?
Y N
016
- Probe C2G10 (Current Detection 1) and
C2G 13 (Current Detection 2).
Is one of these signals on 1
Y N
017
Go to Page 2, Step 006, Entry Point B.
018
- Probe C2G03 (Transfer Relay).
Is the signal on?
Y N
019
Bad C2 (38LS) card.
020
Bad line box assembly P / N 4836775
Remove the jumper from C2B02 to C2D08.
021
- Remove the jumper from C2B02 to C2D08.
- Press RESTART on the 5110.
Is the conversation with the nearby
telephone set OK again?
Y N
4 4
F G
No more tone; silent handset.
C2G 10 and C2G 13 signal levels:
On: -3V
Off:
+1V
C2G03 signal levels:
On: -2.7V
Off: -4.5V
MAP 0837-3
Transfer Relay should be on when the 5110 is in
data mode and the handset lifted.
01JAN79
EC 836600 PEC -------
MAP 0837-3