RECLINE EXCITE: Service & Maintenance Manual - rev. 1.3
THERE IS NO HR
SIGNAL
Is the supply v oltage correct at
the input to the receiv er?
Is the supply v oltage correct at
the output to the digital plan
board?
Replace cable CBQ-29
1
2
YES
NO
YES
Replace Digital plan board
NO
A
Is the serial communication
between the digital plan board
and the receiv er OK?
Replace the digital plan board.
Is the serial communication
between the digital plan board
and the receiv er OK?
Def ectiv e digital plan
board
3
YES
NO
YES
Replace the receiv er
NO
A
Replace the receiv er
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1)
Place the tester probes across pins 4 and 5 of connector CN1 of the receiver. The measured
value should be +5 Vdc.
(2)
As for step (1) but across pins 1 and 8 of connector CN11 on the digital plan board.
(3)
Use the serial communications test described in paragraph 6.1.1.1 “I2C Devices Test”.
Page 6.33
