Bang & Olufsen Beogram CD 5500 Service Manual page 41

Ba
ng &Olufsen
5IC7 SAA7210
39
38
37
36
30
31
29
CEFM. Voltage controlled oscillator output.
*When the disc is slowly bracked by hand, the oscillator will lower its frequency.
WS (Word Select)
Clock
Data
E Flag (Error Flag). Indikerer utroveerdige samples for 8 sampie interpolator.
Indicates untrustworty.samples for 8 sample interpolator,
PIN | BEMAERKNINGER/REMARKS PLAY SERVICE | SERVICE | SERVICE SERVICE | SEARCH
POSITION [ON 1 POSITION 2 POSITION 3 POSITION 4| POSITION
17 |MCES (Motor Control). MCES styrer discmotorens hastighed.
Ay/Ag AQ AQ Ay/Ag | Ay/Ag | At/AQ
MCES controlls the turntable motor speed.
25 |HF (High Frequency). Indgang for HF oje monster. I r
*Efter lead-in er lest
B B B*
HF eye pattern input. (Stable) (Unstable)| (Stable) |»Activity«
"After lead-in has been read.
26 |HFD (High Frequency Detector). HFD vil ga »low« nar HF signalet er for svagt.
*Ved afspilning af testplade 5A, vil HFD give »low« pulser pa spor med afbrydelser og sorte
pletter.
»Highs* »Highe | »Activity«
HED will go dow' when the HF signal is too low.
*When playing test disc 5A, track numbers with interruption or black dot, HFD will make low
pulses.
a
27.|CEFM. Spzendings kontrolleret oscillator udgang,
*Hvis.pladen bremses forsigtigt med handen, vil oscillator frekvensen falde.
4.32 MHz* | 4.32 MHz*| 4.32 MHz
QRA (Q-channel Request Acknowledge).
QCL (Q Clock). :
QData ~
QRA initieres af 5IC6 med »high«, 5IC7 svarer med »low«. Ved forkanten pa nzste clock puls
sattes QRA vhigh« igen af 51C6.
Nar 5IC6 har modtaget nok information (via Q Data), gar QRA »low«, Dette gor at QRA tiden
varierer.
QRA is initiated by 5IC6 with 'high', 5IC7 answers with low'. With the next leading clock (Q CL)-
the QRA is set 'high' again by 5IC6.
When 5IC6 has taken enough information (via Q Data), QRA will go 'low'. This makes the QRA
times vary each time.
my
D
D
»Activity«
Activity«
F
F
F
33
35
34
SW (Subcode Word clock).
SC (Subcode Clock).
SD (Subcode DATA)
Efter Motor Start Pulse vil Subcode Word Clock vere synlig.
Medens en burst pa 10 clock pulser er synlig pa SC, overfores Q-channel information pa SD.
Herefter falger P-bit indikation.
P-bit indikationen kommer mellem 2 bursts pa 10 clock pulser. Ved pause er P-bit indikationen
shigh« og ved musik er den »low«.
After Motor Start Pulse, Subcode Word Clock is visible.
While the burst of 10 clock pulses appear on SC, the Q-channel information is transferred on SD.
Hereafter the P-bit indication follows.
The P-bit is 'high' between two bursts of 10 clock pulses in case of pause indication, and 'low' in
case of music indication.
140uS : 440uS
7-4
POSTION: PLAY (BEGINNING! POSITION: PLAY (NORWAL)
Amplitude + 1.5 Vop
B
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20724 | ans "
MHz
F RA a
{
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DATA, i w---= 4
(trigger om QRA) i
G * acca pc Ms RT ey LS pe
. i 1 [= a |
ren
2
{ trigger on SW}