Service manual

5-4 Troubleshooting Charts
July 1, 2002 68P81076C25-C
Chart C.2 Command Board
Replace and/or
Reprogram
VOCON Board.
(See Note 2)
Control Head Display:
Reprogram or
Replace VOCON
Board (See Note 2).
Error In
VOCON Board.
Replace Board
(See Note 2).
External EE Memory
or VOCN Board
Faulty.
Is
Problem
Corrected?
No
START
LEGEND
U522 - Serial Input/ Output IC
U500 - Regulator Power Control IC (RPCIC)
HLN6458- VOCON Board
U525 - MUX Gate
Yes
Control Head Display:
"FAIL 01/81"
"FAIL 01/82"
"FAIL 01/84"
"FAIL 01/88"
"FAIL 01/02"
Check
RPCIC Enable
At U522-15.
Check Voltages -
UNSW +5V, SW +5V,
+9.6V.
Check VOCON Board
Address/Data
Activity.
Voltages
OK?
Logic
Low?
Check Res
SWB+
U522-28.
Check POR
Reset
P501-29.
START
Yes
No
Activity?
Yes
No
Check Reset
U522-40.
Replace
VOCON Board
(See Note 2).
Problem
In U522.
Clear
Failed Area.
Logic
High?
Yes
No
Check R526
or C511.
Volume
High?
Yes
No
Logic
High?
Yes
No
No
Ok?
No
Yes
Problem Is
RPCIC
Regulators.
Logic
High?
Problem Is
With SWB+
Circuit.
Check +5VDC
P501-33, 34.
and 37.
Problem Is
L510, L511, or
L512
Check BUS+/-
P502-25, 22
(Press Control
Head Button).
+5V
Correct?
Yes
No
Problem Is In
VOCON Board
(See Note 2).
Activity?
Yes
No
Check "ODC"
Output (2.4MHz)
P501-7.
See Note 1.
Yes
Check RX Data
U501-17
(Press Control
Head Button).
Check TX Data
P501-18
(Press Control
Head Button).
Activity?
Yes
No
Activity?
Yes
No
Activity?
Yes
No
Check U522-19
(Press Control
Head Button).
Activity?
Yes
Yes
No
Check
P501-19.
Check Busy In
P501-20
(Press Control
Head Button).
Check Busy Out
P501-19
(Press Control
Head Button).
Activity?
No
Problem Is In
VOCON Board.
(See Note 2)
Replace
RF Board.
No
Yes
Problem Is
SIOIC
Circuits.
Shorted?
Yes
No
Check Q403
For Shorts.
Problem Is
C584 or JU523.
Check U522-20
(Press Control
Head Button).
Activity?
Yes
No
Problem Is
U522, C821, C822,
C870, or C861.
Check 9.6V
Input
U522-14.
Control Head Display: "FAIL 01/90" or Blank
Note 1: See Control Head Troubleshooting Chart In Spectra Detailed Service Manual.
Note 2: See VOCON Board Troubleshooting Chart.
Activity? Activity?
Yes
Yes
No
No
Check U522-13
(Press Control
Head Button).
Check P502-9
(Press Control
Head Button).
Check U522-11
(Press Control
Head Button).
Yes
Problem Is
With R579 or
SIOIC.
Problem Is
With Vocon Board
(See Note 2).
Activity?
No
Problem Is
With U522.
Problem Is
C585 or
JU524.
Activity?
Yes
Yes
No
No
Check U525-14
(Press Control
Head Button).
Check U525-11
For +5 Volts.
Problem Is
Q509 or VR401.
Logic
High?
Problem Is
U525.
Yes
Activity?
No
Problem Is
With R578.
Problem Is
With U522.
MBEPF-25191-O