8.1 Self-test and Error Message
8-3
4. CH70 RX PCB
Modulated signal 37.5 kHz of CH70 TEST signal is outputted from U17: CODEC on
CPU board. This test checks the test signal modulated by 1300 Hz and that modulated
by 2100 Hz. If the same signal transmitted from U17: CODEC on CPU board via R37
on CH70 RX board is detected, it will be assessed “OK’’. “NG’’ means there may be a
problem with CPU board (05P0773). Refer to page 8-12 for CH70 RX test which takes
the same procedure.
Fig. 8.1.4 CH70 RX PCB Test
5. DUP RX PCB
This is indicated when FM-8800D is in use. This is to check the unlocked state of PLL
circuit on DUP RX board (05P0777). Frequency to be checked it is 161.5 MHz at the
time of self-test. The Un-lock/Lock signal is outputted from U8: PLL IC on DUP RX
board. “NG” means there may be a problem with DUP RX board.
RX 1
st
Lo is Fo + 51.2375 MHz.
Fig. 8.1.5 DUP RX PLL Block Diagram
U17
(AK4528VF)
U10
(AK4543)
CODEC
CODEC
CH70 TEST
CH70 IF OUT
Q7
U18
R37 100k
R36
CR4
MIX
37.5kHz
37.5MHz
J3
#3
#5
#3
#5
J4
CH70 RX
05P0775
CPU
05P0773
DSP
U20
(ADSP2186)
CPU
U30
(HD64F2377)
PMBF M310
VCO
LPF
PLL
PLL2 UN-LOCK
BPF(L/C)
BPF(L/C)
ISS271
BPF(L/C)
2SC3356
1SV229
51.2MHz
Rx 1st Lo
(Fo+51.2375MHz)
PLL2 DATA(STB/DATA/CLK)
CR10/11
CR8/9
U5
Q5
FL1
(51.2375MHz)
U8
U3
LMX2353TMX
Q6, CR3/4
Q11
uPC2745TB
2SC3356
Q13
Q1
Q4
Q14
uPC2745TB
uPC2745TB
Q10
U30
CPU
U17
CODEC
CPU
05P0773
DUP RX
05P0777
PMBFJ310
2SK882
Q14
2SC3324
Rx 2nd Lo
(51.2MHz)
MA2J728
37.5kHz
DUP RX
TC75HU04F
X2
25.6MHz
Ref. OSC
Содержание FM-8800
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