Sharp XG-MB50X Service Manual page 29

[Adjustment of ballast unit output power (lamp power)]
1. List of parts requiring adjustment
When replacing the following parts, adjust the ballast unit output power (lamp power).
Part name
1 Cement resistor
2 Control PWB
Ballast microprocessor
3
4 5V regulator
PWM controller
5
2. Adjustment jigs
The following jigs are required for adjusting the ballast unit output power (lamp power).
Part name
1 Adjustment jig (resistance load 25Ω)
Connecting cord (conversion cable)
2
3. Ballast unit output power (lamp power) adjustment method
Adjust the ballast unit output power (lamp power) in the following method.
[Setting method]
XG-MB50X
X R-11XC
X R-10S/X
X R-20S/X
Projector
[Adjustment method]
（1）Unplug the ballast unit lamp cable(QCNW-D573WJQZ) of the XR10/20 projector from
the lamp and connect the cable to the connecting cord (QCNW-E007WJZZ).
（2） Connect the connecting cord (QCNW-E007WJZZ) to the adjustment jig
(RUNTZA018WJZZ).
（3） Connect TP1 of the adjustment jig (RUNTZA018WJZZ) to the negative terminal of the
tester and TP2 to the positive terminal.
（4） Turn on the XR10/20 projector.
（5） Age the projector for 60 seconds or more.
（6） Adjust the volume resistor (R7728) of the ballast control PWB (DUNTKD148WEF0) so
that the voltage of the tester reaches 83± 0.5 V.
Adjustment value: 83± 0.5 V
[Cautions]
（1） Caution for electric shock: Do not touch the test points TP1 and TP2 of the adjustment
jig when supplying power since a high voltage and large current is applied to them.
（2） Caution for heat: Be careful that the resistance load of the adjustment jig produces a high
temperature when supplying power.
（3） Connection of the lamp cable: Check that the lamp cable and connecting cord (QCNW-E
007WJZZ) are connected securely.
Poor connection may cause smoking or ignition due to arc discharge.
Ref No. Part code
R905 RR-FZA002WJZZ
DUNTKD148WEF0
--
RH-iXB458WJZZ
IC7707
IC7704 VHITA78L05F-1Y
VHIM51995AF-1Y
IC7701
Part code
RUNTZA018WJZZ
QCNW-E007WJZZ
Ballast Unit
Lamp Cable
(QCNW-D573WJQZ)
C onnecting C ord
（Q C N W -E007WJZZ)
29
Manufacturer
Asahi Communication
SMK
Tester
(Voltage)
−
＋
TP1
Adjustment Jig
(RU N T ZA 018WJZZ)
TP2
XG-MB50X
XR-11XC
XR-10X/S
XR-20X/S