Service manual SP-110
6-3. X-SUSTAIN BOARD
1. Separate PA7 and PA114 connector
2. Check the remaining electrical voltage of PA7
(1) Check the Voltage of Terminal 170V : If maintained beyond 10 volt, discharge (below 5 volt)
with resistance of beyond 1K ohm 5 Watt
3. Confirm the value of series and parallel resistance of RU10//RU13-RU11//RU14-RU12//RU15
(1) Each value of resistance : 6.8 ohm 5 Watt
(2) The total value of resistance : 10.2 +/- 0.5 ohm
(3) In case of wrong value of resistance, replace (open) board and confirm each connector
: the state of insertion ( installation )
4. In case of normal value of resistance, measure the value as following table1.
(1) Use a Diode Tester
(2) If abnormal part is found, replace the board
(3) In case of normal state, Inspect connectors and other boards
Table 1. PA7 The value of Diode Tester of each terminal
+ : red, - : black
*
NAMEDIODEMEASUREDIODEMEASURE
TESTERTESTER
1170V+About 5 sec.-0.49
GND-Later,+
Open
215V+About 3 sec.-0.47
GND-Later, +
Open beyond 2V
3 CU1(5V)+Beyond 1.43-0.48
GND-+
Table 2. PA114 The value of Diode Tester of each terminal
+ : red, - : black
*
The configuration of terminal ( top view, components side )
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ACEC
