TM 55-1520-240-1
5-2.8 NO FWD VERTICAL OR AFT VERTICAL INDICATION ON IPS INDICATOR (Continued)
5-2.8
IS 28VDC POWER INDICATOR
ON STROBEX LIT?
REFER TO TROUBLE SYMPTOM
TASK 5-2.5.
LOCATE SHORT ON WIRES
W673-176-22 RED, W673-179-
22,W673-178-22,W673-169-
22 RED, OR W673-170-22 BLU
AND SHIELD BETWEEN PLUG
300P47 AND BLADE TRACK RE-
CEPTACLE 138J1. REPAIR OR
REPLACE WIRE AS REQUIRED.
REMOVE FWD ACCELEROME-
TER BLOCK TEST VERTICAL
ACCELEROMETER AND WIRING
(TM 55-4920 -402-13&P). DID
ACCELEROMETER BLOCK
CHECK GOOD?
REMOVE JUMPER DISCONNECT
PLUG 300P47 AT STA 105.
CHECK CONTINUITY ON BLADE
TRACK RECEPTACLE 138J1
BETWEEN PINS R AND J AND
PINS F AND G. IS CONTINUITY
PRESENT?
DID IPS METER POINTER MOVE
UPSCALE AND NOT RETURN TO
ZERO WHEN ROTARY SWITCH
SET TO AFT VERTICAL?
REMOVE JUMPER. LOCATE
OPEN IN WIRES W639-417-20
RED, W673-176-22 RED,
W639-415-20 RED, W673-169-
22 RED, OR W673-179-22 BE-
TWEEN FWD ACCELEROMETER
BLOCK PLUG 138P2 AND
BLADE TRACK RECEPTACLE
138J1 REPAIR OR REPLACE
WIRE AS REQUIRED.
LOCATE SHORT ON WIRES
W639-415-20 RED, W639-416-
20 BLU, OR W639-417-20 RED
AND SHIELD BETWEEN RECEP-
CHECK CONTINUITY ON RECEP-
TACLE 300J47 AT STA 105
BETWEEN PINS 16 AND 22, 23
AND 24. IS CONTINUITY PRE-
SENT)
REPAIR OR REPLACE ACCELER-
OMETER BLOCK AS REQUIRED.
TACLE 300J47 AND PLUG
138P2. REPAIR OR REPLACE
WIRE AS REQUIRED.
REMOVE AFT ACCELEROMETER
BLOCK TEST VERTICAL ACCEL-
EROMETER AND WIRING (TM
55-4920-402-13&P). DID AC-
CELEROMETER BLOCK CHECK
GOOD?
TROUBLESHOOT VIBREX BAL-
CHECK FOR CONTINUITY ON
ANCER (TM 55-4920 -402-
No RECEPTACLE 300J44 BETWEEN
13&P)
PINS 55 AND 51, 52 AND 53.
IS CONTINUITY PRESENT?
END OF TASK
Change 4
5-17
