Panasonic KX-MB771GR Service Manual page 107

12.3.6. CALL SERVICE TROUBLESHOOTING GUIDE
Call Service related error is most frequent.
Call Service 1 ----- Polygon doesn't rotate......... Refer to LSU (Laser Scanning Unit) SECTION (P.40).
• First, listen to the sound. If rotation sound isn't heard, check 24V line, POLON signal and POLCLK signal. If even a little of sound
is heard, check XREADY signal.
Call Service 2 ----- Laser isn't output.......... Refer to LSU (Laser Scanning Unit) SECTION (P.40)
• This can be judged only by referring to signal. Check 5V line, XHSYNC, XAPC, XVIDEO, XLDON.
Call Service 3 ----- Detection of fixing temperature.......... Refer to HEAT LAMP CONTROL CIRCUIT (P.54)
• *Service mode *655 tells the detection number and 3 latest temperatures of the thermistor. The detection point of the Call Ser-
vice 3 and the thermistor temperature is displayed. Maximum 3 latest temperatures are displayed showing the newest on the left.
[AABB CCDD EEFF] AA, CC and EE show the detection points and BB, DD and FF show their temperature detection points.
00: CALL SERVICE 3 was not occurred.
01: means that the value of AD did not increased by 6 steps or more within 10 sec soon after the heater was turned ON. (ther-
mistor's open detection)
02: means that it did not reach the first stabilizing temperature (170°C: 5Bh) within 50 seconds.
03: means that it did not reach the second stabilizing temperature (195°C: 44h/200°C: 40h) within 70 seconds after reaching the
first stabilizing temperature (170°C: 5Bh).
04: means that it dropped to 155°C: 6Ch/160°C: 66h (-40 deg) or below by the temperature control after reaching the second sta-
bilizing temperature (195°C: 44h/200°C: 40h).
05: means that it did not reach the first stabilizing temperature (170°C: 5Bh) within 30 seconds from detection temperature 1
(70°C: D8h).
06: means that it became 235°C: 2Ah or over during printing.
07: means that during printing the short of the thermistor (AD: 00h) was detected.
08: means that the thermistor's short (AD: 00h) and open (AD: FFh or over) were detected.
<Note>
Once "CALL SERVICE3" is displayed, it does not disappear until the Factory Setup or Service Function #529 is
Therefore Service Function #529 should not be executed before the confirmation, and #529 should be done after the countermea-
sure.
Call Service 4 ----- Rotation of Fan.......... Refer to FAN MOTOR SECTION (P.37)
• Connector isn't inserted firmly, dust is caught in and the fan is broken.
• Rotation of the Fan can be confirmed by following Test Mode.
Service mode *677
:1... Normal operation (default)
:2... Right Fan ON (High speed)
:3... Right Fan ON (Low speed)
:4... Left Fan ON (High speed)
:5... Left Fan ON (Low speed)
:6... Both Fan OFF
Call service 5 ----- Rotation of Engine motor.......... Refer to MOTOR DRIVE SECTION (P.30)
• Engine motor's rotation detection signal LD did not become Low within rated speed ±6.25%.
• Service mode *556: the operation of Main Motor can be checked by pressing 0 and SET buttons.
Call service 6 ----- Detection of Charger error.......... Refer to the HVPS (High Voltage Power Supply) SECTION (P.52)
• Breaking of charger's wire of Drum Unit and/or loose connection of High voltage terminals (CHRG, GRID).
• First, replace the Drum unit even so, it doesn't function check the high voltage power supply.
* As for Call Service 1, 2, 4, 5 and 6, turn the power OFF then ON to restart.
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KX-MB771GR
executed.