TROUBLESHOOTING & REPAIR PROCEDURES Model 360E Instruction Manual
D1 – M/R Sensor Status
D2 – Segment Sensor Status
JP4 Connector to Opto-Pickup
Board
Figure 11-4: Sync/Demod Board Status LED Locations
11.1.4.3. Relay Board Status LED’s
There are eight LED’s located on the Relay Board. The most important of which is D1, which indicates the
health of the I2C buss. If D1 is blinking the other faults following LED’s can be used in conjunction with DIAG
menu signal I/O to identify hardware failures of the relays and switches on the relay (See Section 6.9.2 and
Appendix D).
Table 11-4: I2C Status LED Failure Indications
LED FUNCTION FAULT STATUS INDICATED FAILURE(S)
D1
(Red)
I2C buss Health
(Watchdog
Circuit)
Continuously ON
or
Continuously OFF
Failed/Halted CPU
Faulty Mother Board, Keyboard or Relay Board
Faulty Connectors/Wiring between Mother Board,
Keyboard or Relay Board
Failed/Faulty +5 VDC Power Supply (PS1)
STATUS LED’s DC VOLTAGE TEST
POINTS

RELAY PCA

PN 04135

Figure 11-5: Relay Board Status LEDs
198 05232 Rev B3