Ld Main Control Board Test Points - Ricoh Aficio Color 3006 Service Manual

TP/SW/LED/FUSE

4.6.3 LD MAIN CONTROL BOARD TEST POINTS

TP No. Signal
TP601 GND Ground
LDON Shortening this terminal to
ground causes the LD to stay
TP602
on in full mode during the
polygon ON period.
XWD7 Least significant bit of the LD
TP603
control image data (1/8 bits)
LDCLK LD control pixel clock used to
TP604
latch data.
LDLVL Defines the LD control
TP605 reference voltage. 0 to 2V,
normally 1V.
BTRIG Belt mark signal. Set when a
TP606
transfer belt mark is sensed.
XPM PMSYNC. Line sync. signal.
TP607
XWFG WFGATE. Externally
referenced frame sync. signal.
TP608 Controlled by the scanner in
the copy mode and by the
controller in the print mode.
XBFG BFGATE. Write frame sync.
signal. Set by a belt mark or
TP609
software trigger. Source signal
for XSFG.
TP610 GND Ground
XSLS SLSYNC. Scanner or
TP611
controller line sync•signal.
XSFG SFGATE. Scanner or
TP612
controller frame sync. signal.
Description
4-24
Stand-
Remarks
by(V)
0
0 to 5.0 Active L
5 Active L
5 Active H
0 to 2.0 Normally held at 1V.
Active H
0 to 5.0 Set high when a transfer
belt mark is sensed.
0 to 5.0 Approx. 407.05 µs.
Active L
0 to 5.0 Under control of the
scanner in the copy mode
and of the controller in the
print mode. Active L
0 to 5.0 Triggered by a belt mark or
software trigger. Source
signal for XSFG. Active L
0
0 to 5.0 Active L
0 to 5.0 Active L
24 February, 1999
TP
Implementation
No
No
No
No
No
No
No
No
No
No
No
No