Phaser 7700 shows error 007-250 1

[stefme]

Phaser 7700 shows error 007-250 after clearing jam. Error code is not listed in service manual. Can anybody help?

 

[CULTOFLON]

07-250 TRAY COMMUNICATION FAIL
EXPLANATION
Poor transmission [communication?] between the Tray Module PWB and MCU PWB.
Refer to BSD: CH1.4 CH1.5 CH3.1B CH3.4
Procedure
Between Tray Module PWB J555-1 (IT: J555-1, 3T: J555-1, TT: J555-1) (+) GND (-)
Is the voltage +5VDC?
Yes No
Using the wire network from Chapter 7, check the +5VDC circuits to Tray Module PWB J555-1 (IT: J555-1, 3T: J555-1, TT:
J555-1 ). (WN 7.3.6 +5VDC-2)
Between Tray Module PWB J555-3 (IT: J555-3, 3T: J555-3, TT: J555-3) (+) GND (-)
Is the voltage +5VDC?
Yes No
Using the wire network from Chapter 7, check the +24VDC circuits to Tray Module PWB J555-3 (IT: J555-3, 3T: J555-3,
TT: J555-3 ). (WN 7.3.13 +24VDC-3)
Turn off the power. Check the following:
From MCU PWB J407-B10 to Tray Module PWB J541-7 (IT: J541-7, 3T: J541-7, TT: J541-7)
From MCU PWB J407-B9 to Tray Module PWB J541-9 (IT: J541-9, 3T: J541-9, TT: J541-9)
From MCU PWB J407-B11 to Tray Module PWB J541-5 (IT: J541-5, 3T: J541-5, TT: J541-5)
From MCU PWB J407-B12 to Tray Module PWB J541-4 (IT: J541-4, 3T: J541-4, TT: J541-4)
Are all of the resistances 1 omega or less?
Yes No
Check for broken wires or bad contacts on wires that are not 1 omega or less.
Change the following parts in order:
Tray Module PWB (PL14.5 / PL15.9 / PL16.15 )
MCU PWB (PL13.1)
ESS PWB (PL13.1 ).

BEFORE CHECKING ALL THE ABOVE RESET THE ENGINE INTERFACE BOARD. GOOD LUCK