Replacing Digital Unit - Kenwood TS-990S Service Manual

● Checking the AHLT signal
Checking the MCU AHLT signal
Points to be checked
AHLTH MCU (IC1) side IC9 (1 pin)
AHLTS MCU (IC201) side IC9 (2 pin)
● Checking the communication
of the main display
Checking the communication waveform of the main display
Points to be checked Normal voltage
DCLK R679 The communication waveform of 3.3V
DE R660 The communication waveform of 3.3V
DATA R661~R678 The communication waveform of 3.3V
ABLENM R681 3.3V (Turn the transceiver power ON)
● Checking the communication
of the sub display
Checking the communication waveform of the sub display
Points to be checked Normal voltage
RESB R304 The communication waveform of 3.3V
DOTCLK R375 The communication waveform of 3.3V
The communication waveform of 3.3V
DEN R372
DATA CP26~CP31 The communication waveform of 3.3V
3.3V (Turn the transceiver power ON)
ABLENS R680

Replacing Digital Unit

■ Digital unit Information
Original Digital unit
Number
X46-3390-00
■ Method of confi rming "Original Digital unit" and
"Service Digital unit"
The black marking is attached to the silk print part of the
Service Digital unit (X46-3390-01).
TROUBLE SHOOTING
Normal voltage
3.3V
3.3V
When a normal value is confirmed.
If it appears even when the display is unusual, it is not necessary to perform the above-mentioned check.
Perform the following checks.
When a normal value is confirmed.
For Service Digital unit
Number
X46-3390-01
When an abnormal
value is confirmed.
MCU or DDR2 is broken.
DCLK has an abnormal.
[MCU: IC1]
Remove the coaxial cable from CN652, and check the input and
output waveform of the buffer (IC653).
When an abnormal If the waveform of the input side becomes abnormal, MCU (IC1) is
broken.
value is confirmed.
DE and DATA has an abnormal.
[MCU: IC1]
Remove the flat cable from CN651, and check the input and output
waveform of the corresponding section of IC651 or IC652 which is a
buffer.
If the waveform of an input side becomes abnormal, the MCU (IC1) is
broken.
ABLENM has an abnormal.
When an abnormal [MCU: IC1]
Remove the flat cable from CN651, and check the MCU side terminal
value is confirmed.
waveform of R681.
If the waveform becomes abnormal, the MCU (IC1) is broken.
If parts other than the above are abnormal or normal, there is a
problem other than the BGA parts.
[MCU: IC201]
Remove the flat cable from CN225, and check the MCU side terminal
waveform of the resistor in which the abnormal value is shown.
If the waveform is abnormal, the MCU (IC201) is broken.
If the waveform is normal, there is a problem other than the BGA
parts.
TP142
P2 CP58
R164 R98
R104
3
2
1
6
C279
C389
6
R136
R334
R331
R330
R332
R335
R336
R337
R333
R338
R283
C182
C95
TS-990S
X46-3390-00
J79-0353-29
50
VCC(33B) 49
R988
NC R375
R398
VSS
DOTCLK
VSS
VSYNC
R987 HSYNC
R372
DEN
VSS
RR7
RR6
L320
VSS
RR5
L319
RR4
VSS L318
RR3
CP31
RR2 L317
VSS
RR1
RR0
VSS
GG7
GG6
VSS
L312
GG5
GG4 L311
VSS
GG3 L310
CP29 GG2
VSS L309
GG1
GG0
VSS
BB7
BB6
VSS
BB5
L304
BB4
VSS L303
BB3
L302
BB2
CP27 VSS L301
BB1
BB0
VSS0
TP315
SDI
SCK
CSB
RESB
2 VSS
1
TP228
TP233
R315
TP234
R316 1 VCC
VCC 2
TP232 R227
R680 TP684 VCC
TP230 TP231 VCC
TP662
R359 DE
VSS
R367
R303 C344 R678 TP663 VSS
B5
TP302
R677 TP664 VSS
B4
X201 TP665
R676 VSS
B3
R675 TP666
VSS
B2
R674 TP667 VSS
B1
R341 TP282
R302 C343 R364 R673 TP668 VSS
B0
R339 R365 R672 TP669
VSS
TP284 G5
R340
TP266 R671 TP670 VSS
R344 G4
TP272
R670 TP671 VSS
R342 G3
TP672
R669 VSS
R345
TP273 G2
R668 TP673
R975 VSS
G1
10 U2GND
U2SGND
U2D-
U2D+
U2VBUS
U1GND
U1SGND
U1D-
U1D+
1 U1VBUS
9 DGND
DGND
DGND
TP685
R681
1.2V_3
TP683
1.2V_3
1.2V_3
1.8V_1
1.8V_1
1 8V 4
159