Panasonic RQ-352 - Chip Parts Repair Procedures; Mounting and Precautions; Service Tools and Measurement; Special Tools for Chip Parts

8. Mounting
Piace soider on the foil chip mounting, and solder the chip
while applying the soldering iron in the direction of the arrow,
as shown in the diagram (fig. 2)
C. Precautions in mounting the chip
1. Do not heat the chip beyond 3 seconds.
2. Do not rub the electrode.
” Pin A Ftiat nanan nn te Re mart ar. AAR An AEN FAR miivtarn
wv. Wot LWecrzoio LU VicVvul L cally UdIHIaYyeo LU Uo OULITaAUSo
4. lt is recommended that a pencil-type soldering iron be usec.
5. Maintain temperature control under 260°C (500°F) when
soldering.
Soldering iron
(point must be clean)
* Chip resistance (of not more than 100@) may vary greatly with the direction of mounting; therefore,
mount tne white side on the pattern side.
6. Do not re-use the tantalum capacitors or ceramic capacitors after removal (use new components).
7. Do not subject the components (chips) to excessive stress
troduce
our
specia
asy
handling
anc
arts
are
aytromely
6
ling
is
very
d
Technica!
espncton
r
No.
ARDRIOTOIB
319.01)
=
=
Y = C)
cD
Fe a O oO: =.
O
oO
‘Rava
Bat 9
sth
$
TOOL
KIT
FOR
CHIP
PARTS
SPECIAL
SOLDERING
IRON
FOR
CHIP
PARTS
HM-357
NOTES: Keep good condition, set switch buttons and controls in th
HM-354
—~
Gilt ices otaiae value is not within ie adjust VR201 {shown in circuit boards and
errr mn eae ae ti, fear nA Ris
|
|
| | Standard value: +2.5% (f= 2,925—3,075Hz) |
| |
|
he following positions, unless otherwise specified.
«
Make
sure
heads
are
clean.
|
e
Judgeable
room
temperature:
20+5°C
(68+9°F}
» Make sure capstan and pressure roller are ciean. @ Volume control: Set to 8.
ee 1
| ITEM | MEASUREMENT & ADJUSTMENT |
q j {
Tape
speed
accurac
|
| A
Tape
speed
accuracy
P
p
;
y
i.
f
fae
Ny
é
Record/playback
head
Monitor
jack
|
i
adjustment
1.
Test
equipment
connection
is shown
in
fig. 1.
pa
|
Sohdion
2.
Playback
test
tape
(QZZCWAT
3,000Hz),
and
|
|
*
Playback
mode
|
supply
playback
signal
een
.
a
Ee
ee
ae
3.
Take
measurement
at
middle
section
of
test
Digital
|
Equipment:
|
tape
electronic
counter
|
i M7 ri ite e| os} ic s ce : ; H
nae ee 4. Measure this frequency. Fig. 1
ca v q vy 5. On the basis of 3,000Hz, determine value by following formula:
counter f—3.000
; oe nae ey P i
i *« Test tape... QZZCWAT Tape speed accuracy = a 600 * 108 (%} where, f= measured value |
| * Resistor (BQ) |
| |
i
|
| |
Wiring Conn ction Giagram), so inat trequency becomes 3,000 Hz.
Adjusting the Checks after motor replacement
governcr circuit | 1. After replacing the motor, playback the test tape (QZZCWAT) and listen to the reproduc-
(u adjustment) ed sound.
Condition: lf the sound vibrates or fluctuates, change the resistor (R204) to 1.5 ohms
« Playback mode (ERD10TJ1R6).
2. Playback the test tape (QZZCWAT) and check that the reproduced sound does not
fluctuate.
rover ICTR RHR PASSO NCE Oe OR ISOM
HL
|