Gamma Correction And Thermal Storage Correction; Discrimination Of Video Signal To Be Input; Remote Interface; Storage Of Print Count History - Sony UP-895 Service Manual

4-4-11. Gamma Correction and Thermal Storage Correction

To correct the gamma fluctuations due to the temperature change in a head, a system control reads the
head temperature and transfers the gamma data for controlling the stair density to a memory and head
control circuit (IC501). The gamma data consists of 17 data (T
are transferred during print start. During printing, Tx is transferred at the falling edge of an
nPRNT_PULSE pulse in the first line, and T
pulse in the second line. If the first line is printed by T
Therefore, the fist line is printed by Tx obtained when T
printed by T .
0
nCOPY_KEY
nCOPY
nINTV
Temperature read
Gamma transfer

4-4-12. Discrimination of Video Signal to be Input

A system control (IC304) discriminates a video signal by the signals below that are output from a
memory and head control circuit (IC501).
IC304 Signal line
21pin nEXTV
52pin V

4-4-13. Remote Interface

A system control (IC304) accepts a signal when a low pulse of more than 100 msec is input to the remote
terminal (J300). After about 80 msec from the falling edge of the input pulse, the system control (IC304)
activates a BUSY signal. The BUSY signal is cleared after printing is completed.
nREMOTE_KEY
BUSY

4-4-14. Storage of Print Count History

A system control (IC304) stores the history of print count in EEPROM (IC305). The data is not erased
even if the power is turned off. Therefore, this makes it possible to monitor the history of print count
since shipping of products. This method can be displayed using the service person mode (self-diagnostic
function). Fore more details, refer to Section 6.
UP-895/(E)
is transferred at the falling edge of an nPRNT_PULSE
0
, the change in color becomes insufficient.
0
0
T to T Tx
1 16
transfer transfer
Discrimination
V period is long: PAL
V period is short: NTSC
Fixed in L or H: Non-interlacing
L and H are repeated: Interlacing
100 ms
80 ms
, and T through T ). Data T
0 1 16
is corrected. The second or later lines are
T
0
transfer
through T
1 16
Print end
4-13