Acdr2 Check; Starting The P.c.b. Test Mode - Yamaha CDR-HD1500 Service Manual

CDR-HD1500
QQ
3 7 63 1515 0

ACDR2 Check

By using the mode 1, mode 2 and mode 3 of the P.C.B.
test mode, the operation of the ACDR2 can be checked.
In Mode 1, the analog signal input/output operation is
checked.
In Mode 1, it is possible to check the A/D and D/A
converter function of CODEC, signal flow in ACDR2,
operation of the low pass filter in the input/output circuit.
In Mode 2, input of the optical digital signal and digital
output operation are checked.
The ADCR2 decodes the sub-code and displays the track
No. and the track time. To test this decoding function, the
digital output of the CD player is used.
In Mode 3, the digital coaxial signal input and analog
output operation are checked.

Starting the P.C.B. Test Mode

1) Turn off the power.
2) Remove the HDD unit for the convenience of the work
of the next step 3). (p. 14)
3) Short between pins No.1 and No.2 of the CB5. (MAIN
P.C.B., E3 in p.41)
4) Short between J909 and J913. (OSD P.C.B., C4 in
p.44)
5) Turn on the power.
6) The P.C.B. test mode is activated and "TEST mode
TE
L 13942296513
PCB" is displayed.
Mode 1 Operation Check
1) Set to Mode 1 by pressing the "
mode 1" is displayed.
2) Enter the analog signal through ANALOG LINE IN.
Input signal: Sine wave, 1kHz, 150mV (-14.2dBm)
3) Set the ANALOG REC LEVEL volume to the MAX
position.
4) Check the analog signal output at ANALOG LINE OUT.
Output Level : 775mV (0dBm)
www
.
18
http://www.xiaoyu163.com
" key. "test
Signal flow diagram of Mode 1
DIT
selector
x ao u163
y
AUDIO patch
i
MAIN
ACDR2
PCB
http://www.xiaoyu163.com
2 9
8
Q Q
3 6 7 1 3 1 5
OPTICAL
CB200
OUTPUT
COAXIAL
PJ200
OUTPUT
DIR5
OPTICAL
CB201
INPUT
COAXIAL
PJ201
INPUT
co
.
ANALOG
D/A LPF PJ202
OUTPUT
ANALOG
A/D LPF SW PJ202
INPUT
9 4 2 8
0 5 8 2 9 9 4 2 8
m
9 9
9 9