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KDC-BT6544U/BT6544UY
/BT7043U/BT742U
When replacing front-end (A48x) of mother unit (X34-), or
when adding or replacing ROM correction (program cor-
rection with ROM IC (IC300)), the following activities are
required.
■ Overview
When replacing front-end (A48x) in the model where
ROM correction and security data have been written into
E2PROM, included in the front-end (A48x) pack, the transfer
function of the E2PROM data itself in the replaced front-end
(A48x) is required.
This function in the above system confi guration is used to
allow for complete replacement of the front-end at any ser-
vice center.
■ Overview of specifi cations
Procedures for replacement are as follows: To install the
E2PROM (IC300) BR24L04FV-W to the mother unit (X34-),
and replace front-end (A48x) with new front-end after copy-
ing the data in the E2PROM (IC300) (such as ROM cor-
rection data and other data) in the front-end (A48x) to the
mother unit (X34-) by operating the system, and then copy
the data (such as ROM correction data and other data) into
the mother unit to the E2PROM of the front-end (A48x), op-
erating the main body.
Tuner adjustment data was inserted during the tuner pack
manufacturing, and data will not be transferred because
front-end (A48x) is built-in.
In addition, tuner adjustment data for new front-end (A48x)
is supplied as a service part in which data was inserted.
■ Data to be copied
• ROM correction data
• Other data
Security data
DEMO MODE ON/OFF status
POWER ON time (For maintenance)
Playback time (For maintenance)
EJECT count (For maintenance)
Panel open/close count (For maintenance)
CD I2C status (For maintenance)
CD offset error code (For maintenance)
CD sound skips count (For maintenance)
CD time code not updated count (For maintenance)
CD load switch errors count (For maintenance)
CD ejection errors count (For maintenance)
DC offset error (For maintenance)
20
ROM DATA TRANSFER PROCESSES
Forced Power OFF information (For maintenance)
Serial number (For maintenance)
E2PROM data check data (For internal check)
■ Operation procedure
Operation procedure is different depending on the condi-
tions. Proceed with the appropriate operation procedure
depending on the specifi c condition.
1. In case of replacing front-end (A48x) without an appli-
cable ROM correction.
2. In case of replacing front-end (A48x) with an applicable
ROM correction.
3. In case of applying new ROM correction at the same
time when front-end (A48x) is replaced. (No ROM correc-
tion has been carried out.)
Mother unit (X34-)
FRONT-
END (A48x)
E2PROM
Install new E2PROM (IC300) BR24L04FV-W.
Install E2PROM (IC300) containing no data, in case of [1]
and [2].
In case of [3], install maintenance E2PROM with an appli-
cable ROM correction program.
Mother unit (X34-)
FRONT-
END (A48x)
E2PROM
SYSTEM
μ-COM (IC302)
E2PROM
(IC300)
E2PROM circuit pattern
SYSTEM
μ-COM (IC302)
E2PROM
(IC300)
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