Philips SD-5.31SL Service Manual page 17

Table 5-15 Disc motor switching
Signal
Name Testpoint Frequency
SMOTOR Pin22/IC7101 Output voltage control
SSPDON Pin23/IC7101 Power save
Motor ON - high
Motor OFF - low
VH Pin15/IC7101 HALL Bias
Motor ON - LOW
Motor OFF - HIGH
SFGIN Pin 24/IC7101 Tacho signal output
DA1 F113 Output
DA2 F114 Output
DA3 F115 Output
H1+ F112 H1+ HALL input (positive signal)
H1- F111 H1- HALL input (negative signal)
H2+ F110 H2+ HALL input (negative signal)
H2- F109 H2- HALL input (negative signal)
H3+ F108 H3+ HALL input (negative signal)
H3- F107 H3- HALL input (negative signal)
PM3380B
ch1
6
CH1 1.00 V= MTB2.00 s- 3.94dv ch1+
Figure 5-24 SMotor (Random during jump track)
PM3380B
ch1
1
H1 2.00 V= MTB1.00ms
Figure 5-25 SFGIN
Test Instructions Mono Board SD5.31SL
CL 36532043_048.eps
030603
ch1+
CL 36532043_049.eps
050603
SD-5.31SL
PM3380B
ch1
T
1
CH1 2.00V=
Figure 5-26 DA1-DA2-DA3
PM3380B
ch1
1
CH1 500mV= MTB 5.00ms
Figure 5-27 HALL input signal
When measurement is completed, switch the discmotor OFF
before executing next command
5.6.3 Tracking check
The tracking control circuit is checked using the following
commands:
Table 5-16 Tracking
Ref. # Command Name
40a BeRadialOn
40b BeRadialOff
Visual check on the radial ,when Radial control ON, if the
radial movement is visible.
Once the check is completed,switch the Radial control OFF
before executing next command
To check the waveform of TRACK- and TRACK+,
connect a 10W / 0.25W resistor between TRACK- and
TRACK+ to serve as dummy load without connecting the
loader.
5. EN 17
S T OP
MTB 5.00mus ch1+
CL 36532043_058.eps
ch1+
CL 36532043_064.eps
030603
Remark
Radial control on
Radial control off
030603