Sony UP895 Service Manual - Page 39

Gamma Correction and Thermal Storage Correction

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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 , and T through T ). Data T through T 0 1 16 1 16 are transferred during print start. During printing, Tx is transferred at the falling edge of an nPRNT_PULSE pulse in the first line, and T0 is transferred at the falling edge of an nPRNT_PULSE pulse in the second line. If the first line is printed by T0, the change in color becomes insufficient. Therefore, the fist line is printed by Tx obtained when T0 is corrected. The second or later lines are printed by T0. nCOPY_KEY nCOPY nINTV Gamma transfer Temperature read T1 to T16 transfer Tx transfer T0 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 21pin 52pin Signal line nEXTV V Discrimination V period is long: V period is short: PAL NTSC Fixed in L or H: Non-interlacing L and H are repeated: Interlacing 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 100 ms BUSY 80 ms Print end 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) 4-13

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4-13
UP-895/(E)
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
0
, and T
1
through T
16
).
Data T
1
through T
16
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
0
is transferred at the falling edge of an nPRNT_PULSE
pulse in the second line.
If the first line is printed by T
0
, the change in color becomes insufficient.
Therefore, the fist line is printed by Tx obtained when T
0
is corrected.
The second or later lines are
printed by T
0
.
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
Discrimination
21pin
nEXTV
V period is long:
PAL
V period is short:
NTSC
52pin
V
Fixed in L or H:
Non-interlacing
L and H are repeated: Interlacing
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.
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.
nCOPY_KEY
Gamma transfer
nINTV
T
1
to T
16
transfer
nCOPY
Tx
transfer
T
0
transfer
Temperature read
BUSY
nREMOTE_KEY
100 ms
80 ms
Print end