12
DMC-G7R
TROUBLE SHOOTING
(1) Replace E
2
-PROM.
(2) Deprive E
2
-PROM of protection (connect the pins 8 and 2 of IC402).
(3) Refer to the latest E
2
-PROM data list.
(4) Press the Display/Lower-case Character button, Enter/Synchro button and Play/Pause button to start the test mode.
(5) Version display
[ V e r . ]
E
2
-PROM version (C ~ Z)
Microcomputer ROM version
(6) The whole LCD lights.
(7) Test mode stop state
[ T E S T ]
(8) Press the Enter/Synchro button.
[ E E P R O M ]
(9) Perform the operation to display "E
2
-PROM SETTING MODE CHART", compare the E
2
-PROM DATA LIST with the
display, and set according to the E
2
-PROM DATA LIST with the VOL UP or VOL DOWN key.
(10) Set the temperature reference. (Refer to the Temperature Reference Setting Method.)
(11) Set according to the E
2
-PROM DATA LIST.
(12) Press the Stop button.
[ T E S T ]
(13) Press the Stop button.
(14) After data is written in E
2
-PROM, turn off power .
(15) Restore protection of E
2
-PROM (Disconnect connection made in Step (2) above).
E
2
-PROM (IC402) writing procedure
1. Procedure to replace E
2
-PROM and write initial value of microcomputer in E
2
-PROM
2. Temperature reference setting method (to be performed at room temperature 21 to 29
°
C)
(1) Test mode stop state
[ T E S T M O D E ]
(2) Measure voltage of TEMP terminal (pin 3, IC401) of microcomputer.
(3) Calculate the temperature reference, using the following formula.
(4) Round down decimal fractions of calculated temperature reference, and convert it to hexadecimal value.
(5) Correct the temperature according to the table below depending on ambient temperature.
Temperature reference =
Measured voltage x 256
2.8
Ambient temperature
Temperature correction
21 - 23
+ 1
24 - 26
±
0
27 - 29
- 1
An example: Environmental temperature is 22
°
C and set voltage is 1.25V.
Temperature reference =
1.25 x 256
2.8
= 114.286
= 114
(Decimal fraction is rounded down.)
= 72
H
(Conversion to hexadecimal value)
(6) Press the BASS button, and press the SKIP DOWN button.
[ E E P R O M ]
(7) Press the PLAY button, and press the SKIP button.
[ T e m p ]
(8) Press the PLAY button.
[ T E M P ]
: Temperature reference
(9) Set the temperature standard value to the value obtained above with the VOL UP and VOL DOWN buttons.
(10) Press the STOP button.
[ T E S T ]
Lead-in switch position adjusting method
Note: Measure the position of lead-in switch in the INNER mode, and fix the position of lead-in switch at SUBQ FF85 to FF02.
After retightening the screw, pressing the mechanism PWB in the arrow direction, measure again the position of lead-in switch. If the
removed screw cannot be fit after position adjustment, fix with two screws.
Lead In Switch
Mechanism PWB
Remove yhe screw when
adjustment is made.
Loosen two screws
Figure 16-1
Adjustment of magnetic head mounting
position
• When the magnetic head and optical pickup have been replaced,
be sure to adjust the mounting position.
• For easier adjustment of mounting position move the optical
pickup to the center position, and then adjust the position.
1. Set the transparent disc 3 for adjustment.(*1)
2. Turn off the power supply, turn the head drive gear by hand to
lower the head.
3. Viewing the set from above, make an adjustment so that the
magnetic head aligns with the optical pickup objective lens.
• Circumferential direction: Slightly loosen the head fixing screw
(A), and shift the magnetic head fitting to align the head with the
pickup abjective lens.
• Radial direction:Turn the magnetic head circumferential adjust-
ment nut (B), and adjust to align the head with the objective lens.
*1: Before setting the disc remove the decoration plate from the
disc lid, and fix it as shown in Figure 16-2.
4. Make sure that there is a clearance as shown in Figure 16-2 and
that the magnetic head moves up and down smoothly.
5. After adjustment apply Screw Lock to the head fixing screw (A)
and adjusted magnetic head radial adjusting screw (B).
Objective
lens
Clearance
Radial Direction
(Align the magnetic head
with the upper end of lens)
Circumferential direction
(Align the magnetic head
approximately with the
lens center)
Circumferential
direction
Radial
Direction
Magnetic
head
(A)
Apply a screw lack for
head fixing.
A
B
Slightly loosen the head
fixing screw.
Lift Motor
The lift pin is moved in the arrow direction
Magnetic head
(B)
Figure 16-2
QCNWK0091AFZZ (13 Pin)
QCNWK0092AFZZ (14Pin)
QCNWK0093AFZZ (26 Pin)
CNS201
CNS402
CNS601
CNS401
CNS101
Extension PWB for servicing
RUNTK0400AFZZ
Pickup Flexible PWB
Flexible PWB
Headdrive flexible PWB
LCD Flexible PWB
Mechanism
Flexible PWB
QCNWK0090AFZZ (7 Pin)
QCNWK0089AFZZ (6 Pin)
Main PWB
Figure 16-3
DMC-G7R(k)
COVER(
98.4.24
2:20
PM
y[W
22
Содержание DMC-G7R
Страница 18: ...18 PARTS DESCRIPTIONS MC G7R ...
