JVC TK-1280E - Page 28

TK-1280E/-1180E/-1281EG |
SPECIFIC SERVICE INSTRUCTIONS
@ TWO-SIDE HOLE-THROUGH PC BOARD
A two-sided hole-through PC Board is used on this
camera. Patterns and wires are designed extra thin to attain
highdensity component mounting. Rough handling may
damage the patierns/wires or other components. When
disassembling, repairing or adjusting the PC boards, exercise
care to avoid damage.
@ REPAIRING CIRCUIT BOARD MODULES
(1) Removing circuit board module
Pull out the circuit board,after removing solder completely
with a solder sucker.
NOTE:
@ Take care not to damage or remove solider from other parts.
@ If more than two circuit boards are removed, make sure that
they are replaced in the proper position.
e Some circuit boards cannot be removed unless the shielding
case and chassis frame have been removed. When
removing any circuit board, check if this applies to the PC .
board.
(2) Checking circuit board module
To check each circuit board, take out the module and
extend with wires, etc.
W@ REPLACING CHIP COMPONENTS
Use a soldering iron ( temperature 260~300°C. about 17W )
with a slim tip and high insulating ability. those with a solder
sucker ( about 55W ) are usually easier to use.
NOTE:
This video camera uses many mini-flat Cs. To remove these,
melt the solder while picking up the individual pin with fine
tipped tweezers or cut off the IC pins. Take care not to
scratch or peel off the BOARD foil pattern.
@ CHIP COMPONENTS DISPLAY
Besides the resistors, short jumpers,FET’s,ceramic capacitors,
transistors, and other chip components, the chip tantalum
Capacitors and chip variable resistor (CH VR ) are used on
the camera. None of these chip components are reusable
again once they have been used.
NOTE:
1. Avoid rough handling of the VR.
2. Use a thin-tip insulated-type. screwdriver to adjust the CH
VR.
e How to read printings
On certain chip components, printing is applied as follows:
® Chip metal giaze resistor ( CH MG R )
The diagram shown in Fig. A ® is applied to some of
these resistors.
Reading method ( Example )
123 = 12 X 103 Unit:[Q]
Uf
@ Shorting jumper ( 0[Q] of CH MG R )
No diagram is applied to shorting jumpers. A”0”is printed
on Type @ shown in Fig. A
2 (No. 6647)
® Constant
Constant
Tolerance
Multiplier
Fig.A Example of CH MG R/ CH C Cap.codes
@Chip ceramic capacitor ( CH C Cap. )
@The diagram shown in Fig. A ® is applied to some of
the CH C Caps. On some others, there is no diagram
that is of any use to users.
Reading method (Example )
123K= 12 X 103 Unit[,F], Tolerance:K(+ 10%)
@As shown in Fig. B some chip ceramic capacitors are
represented by two digits. Table A shows how those
figures should be read.
;
04 = 10000pF = 0.01pF
Fig.B Exampie of CH C Cap.codes