Sanyo PLC-XU22E Service Manual page 37

Troubleshooting
NO POWER
PERIPHERY OF CHASSIS
1. Is fuse (F901) blown?
Fuse may be opened when either the LAMP indica-
tor or the READY indicator isn't Illuminated. Check
the fuse.
For continued safety, replace with a fuse of the
same type.
TYPE T4.0AH 250V FUSE. (LITTLE FUSE INC.
TYPE 215004)
2. Is projection of lamp cover inside broken or not fit-
ting?
Check the INTER LOCK switch(SW904) and lamp
cover.
SW904 ......................................... OPEN : abnormal
3. Is thermal switch(SW902) operating?
If temperatures periphery of lamp house reaches
100˚C, the thermal switch will be turned off automat-
ically.
SW902 ......................................... OPEN : abnormal
4. Is thermal switch(SW901) operating? (with the
WARNING TEMP. indicator flashing)?
If temperatures periphery of optical unit reaches
85˚C, the thermal switch will be turned off automati-
cally.
SW901 ......................................... OPEN : abnormal
POWER, P.F.C. BOARD
1. Are the LAMP indicator(red) and READY
indicator(green) light?
If the LAMP and READY indicators do not illuminat-
ed, check the primary circuit and S5V of standby
power supply circuit.
2. Check that the FAN DRIVE signal is correct.
Pin 3 of K6P.................................................. H : ON
3. Check that the LAMP BST-SW signal is correct.
Pin 2 of K6P .................................................. H : ON
4. Check that the 5V_SW signal is correct.
Pin 5 of K6P .................................................. H : ON
5. Check that the POWER FAIL signal is correct.
Pin 6 of K6P ......................................... L : abnormal
6. Is thermal switch(TSW611) operating?
If temperatures periphery of P.F.C. circuit reaches
90˚C, the thermal switch will be turned on automati-
cally.
TSW611 .................................... SHORT : abnormal
7. Check the signal at pin 5 of T651. (Switching power
IC output signal)
MAIN COMP-C BOARD
1. Check that the Vcc-voltage(+5V) is applied to pins 4,
5 of K30R and pins 61-64 of K30EE.
MAIN COMP-B BOARD
1. Check that the Vcc-voltage(+5V) is applied to pin 11
of IC1901, pin 38-40 of K15EE.
2. Check that the POWER FAIL signal is correct.
Pin 50 of IC1901 .................................. L : abnormal
3. Check that the TEMP DET. signal is correct.
Pin 26 of IC1901, pin 4 of K5M ........... L : abnormal
4. Check that the LAMP DET. signal is correct.
Pin 27 of IC1901, pin 3 of K5A ........... H : abnormal
5. Check that the LAMP_SW signal is correct.
Pin 29 of IC1901 ........................................... H : ON
Pin 1 of K5A................................................... L : ON
6. Check that the 5V_SW signal is correct.
Pin 34 of IC1901, pin 5 of K5P ..................... H : ON
7. Check that the FAN DRIVE signal is correct.
Pin 44 of IC1901, pin 3 of K5P ..................... H : ON
8. Check that the LAMP BST_SW signal is correct.
Pin 54 of IC1901, pin 2 of K5P ..................... H : ON
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