Service Caution-1 - Panasonic NV-VP60GL Service Manual

NV-VP60GL / NV-VP60GC / NV-VP60GCS
6.2.

SERVICE CAUTION-1

When the Microprocessor IC6001 and/or Back-up battery
B7751 are replaced, read the following procedure carefully and
proceed it.
[REASONS]
There is a RAM in the IC6001, which is backing up:
1. Programme Navigation Data [See NOTE1]
2. TV Tuning Data
3. PG Shifter Adjustment Data
4. Option Setting Data
When IC6001 are replaced, all above listed data become
not available.
These data is backed up by using the power source of:
*AC Connected: AC Power source
*AC Disconnected: Back-up Battery (B7751) & Back-up
Capacitor (C7752)
[NOTE1]
As for your reference, without inserting a tape into a VCR,
you can confirm that the NAVI data that is backed up by
IC6001 as shown in the following steps.
1. Press the Menu button and select the option, then set
the "NAVI" to ON mode.
2. Turn on the Service Mode and press the "NAVI" button
on the Remote Controller in more than 5 seconds. The
"NAVI" data list is displayed on the Monitor. (Press the
"MENU" button
cancellation.)
Although stored NAVI data can be confirmed on the
monitor, there is no way to transfer the NAVI data to IC6001
which is newly mounted.
on the Remote Controller
6.2.1. REPLACING PROCEDURE [IC6001]
[1.PREPARATION]
Before replacing IC6001:
1. Be noted that stored TV broadcast channels might be
erased.
( Because the user may have stored TV broadcast
manually rather than using "Auto Tuning". )
NOTE:
During servicing, do not make a short circuit between
IC6001-pin
otherwise IC6001 may be broken.
CAUTION:
*When replacing the B7751, be sure to read/follow the
"HOW TO REPLACE THE LITHIUM BATTERY"
section.
[2.REPLACING PROCEDURE IN STEPS]
STEP1.PREPARATION
1. Disconnect the AC plug before removing the C.B.A.
with Mechanism unit by referring to the Disassembly
procedure.
STEP2.REPLACE THE IC6001
1. Replace the IC6001. (Do not make a short circuit
between IC6001-pin37 and other pins/Components.)
STEP3.RESET THE IC6001 AT ONCE
for
1. Connect the AC plug.
2. Connect a jumper wire between TL7510 (RESET)
and TL7509 (GND) for a second to reset the
Microprocessor IC6001.
Note:
Since the resistance at pin 2 of IC6001 decides
the model distinction, there is no need to set up
the Model code, which is necessary in the
previous models.
10
37 (5V) with other line/Components