Canon LV-7105 Service Manual - Page 82

Fig. 4-1, On/off Button, Ac Input, Lamp Bst_sw., Lamp Power, 5v_sw., Sw902, Thermal Sw., Inter Lock

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Part 4: Troubleshooting (Power-On: H) LAMP POWER 2 IC301 SYSTEM CONTROL (Power-On: H) LAMP BST_SW. 206 (Power-On: H) 5V_SW. 146 IIC BUS PSDA PSDA 17-18 KEY SW 16 POWER LED IC1803 14 READY LED KEY SWITCHES 15 TEMP LED 13 LAMP REP. LED ON/OFF BUTTON INDICATOR LAMP READY TEMP WARNING LAMP REPLACE Check that the LAMP indicator and READY indicator are lighting. If both of indicators are not lighting,check the primary side of the power supply circuit or S6V of standby power supply circuit. 19 FAN_DRIVE IC1804 (Power-On: H) 18 FAN CONT1 IC1806 IC1808 6 POWER_FAIL 2-5 KEY SW. (Abnormal: L) IC1851 POWER_FAIL 8 LAMP_ERR (Abnormal: H) Check that the 5V_SW signal at pin 11 of K3D is correct. H : Power ON Check that the POWER FAIL signal at pin 6 of IC1808 is correct. L : abnormal 5V_SW. POWER_FAIL FAN Check that the LAMP_BST_SW signal at pin 12 of K3D is correct. H : Power ON IC2882 IC2883 2 4 Is fuse (F601) blown? AC INPUT LAMP_BST_SW LAMP_ERR LAMP_SW F601 FUSE SW904 SW902 INTER LOCK THERMAL SW. SW. Check that the LAMP_POW signal at pin 2 of IC2882 is correct. Fig. 4-1 4-4

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Part 4: Troubleshooting
4-4
Fig. 4-1
IC301
SYSTEM
CONTROL
ON/OFF BUTTON
17-18
16
14
15
13
19
18
146
206
2
6
2-5
8
2
4
AC INPUT
FAN
LAMP BST_SW.
LAMP POWER
5V_SW.
5V_SW.
F601
FUSE
SW902
THERMAL SW.
Is fuse (F601) blown?
SW904
INTER LOCK
SW.
LAMP
READY
TEMP
WARNING
LAMP
REPLACE
Check that the
POWER FAIL signal
at pin 6 of IC1808 is
correct.
L : abnormal
Check that the 5V_SW signal
at pin 11 of K3D is correct.
H : Power ON
Check that the LAMP_BST_SW
signal at pin 12 of K3D is correct.
H : Power ON
Check that the LAMP_POW
signal at pin 2 of IC2882 is
correct.
KEY SW
LAMP_BST_SW
IC1803
FAN_DRIVE
(Abnormal: H)
(Power-On: H)
(Power-On: H)
(Power-On: H)
(Power-On: H)
(Abnormal: L)
IC1804
IC1851
FAN CONT1
IC1806
POWER LED
TEMP LED
READY LED
LAMP REP. LED
POWER_FAIL
POWER_FAIL
POWER_FAIL
IC1808
KEY SW.
LAMP_ERR
LAMP_SW
LAMP_ERR
IC2882
IC2883
PSDA
PSDA
INDICATOR
KEY SWITCHES
Check that the LAMP
indicator and READY
indicator are lighting.
If both of indicators
are not lighting,check
the primary side of
the power supply
circuit or S6V of
standby power supply
circuit.
IIC BUS