Panasonic SJ-MD100 (serv.man2) Service Manual / Supplement ▷ View online
SJ-MD100
– 13 –
Can ROM
disc be inserted
correctly?
Is disc turning?
NO
YES
NO
YES
Does output
of IC3 pin 21 alternate
above and below VREF
(1.65 V)?
Is voltage
output between IC2
pins 17 and 18?
Faulty spindle motor
NO
YES
NO
YES
ROM/RAM Operation
NO
3
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Voltage alternates above
and below VREF (1.65 V).
and below VREF (1.65 V).
IC10
e
LOAD OPEN SW0 (S3)
t
LOAD PLAY SW2 (S5)
y
LOAD PLAY/REC SW3 (S6)
q
DISC-IN
STOP/PLAY
H
H
L
L
REC
H
L
H
L
H = 3.3V L = 0V
5
NO
IC3 pin 21
Faulty IC3
Faulty IC2
Does optical
pickup move up
and down?
(Continued on next page.)
Does CN4
pin 18 change from
"H" to "L" when disc
is inserted?
Faulty loading
TRG S7
D i s c t r a y
O P E N
L
H
H
H
Is output of
IC10 pins 13, 15, 17,
and 18 OK?
Is voltage
of IC10 pins 8
and 9 OK?
Is voltage
output from IC92
pins 2 and 4?
Faulty loading motor
Faulty S3, S4,
S5, and S6
Faulty IC10
Faulty IC92
IC3 pin 18
Voltage alternates above
and below VREF (1.65 V).
and below VREF (1.65 V).
Faulty IC3
Faulty IC2
Does output
of IC3 pin 18 alternate
above and below
VREF (1.65 V)?
Is voltage
output between IC2
pins 13 and 14?
Faulty optical pickup
SJ-MD100
– 14 –
NO
YES
NO
YES
YES
NO
YES
NO
YES
3
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
2.6V
0V
4
Is TOC read
and disc data
displayed?
Does IC10
pin 13 change from
"H" to "L"?
Faulty IC10
Faulty S4
See Service Manual page 27
for measurements of IC1.
for measurements of IC1.
*1:
Is there
output from IC1
pins 11 (TP55) and
16 (TP57)? *1
Can
waveform of IC1
pin 11 be adjusted so that
it is approx. symmetrical
with a level of
1.5 Vp-p?
*1
Faulty IC1 or
optical pickup
optical pickup
Is RF
waveform output from
IC1 pin 32 (TP52)?
*1
Is there
output from IC1
pin 29 (TP148 or
IC3 pin 87)?
*1
IC1 pin 29
(TP148 or IC3 pin 87)
Is RF signal stable?
Are
communications
between IC3 and
IC72 OK?
Communications error
Is voltage
output from IC3
pin 96?
Faulty IC1
Faulty IC1
Faulty IC3
Faulty IC72
Is voltage
output from IC1
pins 38 (TP44) and
39 (TP37)?
*1
Faulty optical pickup
(Continued on next page.)
SJ-MD100
– 15 –
NO
YES
NO
YES
NO
YES
4
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
5
3.3V
0V
16.9344MHz
3.3V
–
3.3V
0V
61
65
64
63
62
Is playback
possible?
Is playback sound
OK?
Press eject key
and remove ROM disc.
Can RAM disc
be inserted?
Is UTOC
read and disc data
displayed?
Play track
1 of a previously
recorded MD.
Is playback sound
OK?
Insert
a recordable MD.
Is recording
possible?
Operation complete.
Faulty magnetic head
Faulty magnetic head
Is shape
of magnetic head
OK?
Is there
output from CN8
TP110 and
TP111?
Is output
of IC3 pin 73 OK?
Faulty magnetic
head circuit
Faulty IC3
Is output of
IC3 pins 61 ~ 65 OK
during playback?
10.9344MHz
Faulty audio circuit
Faulty IC3
(To page 10)
After TOC is read,
does traverse move
to UTOC?
Faulty IC1
See "Traverse Operation"
(next page).
SJ-MD100
– 16 –
NO
YES
NO
YES
NO
YES
NO
YES
1.65V
Traverse Operation
Traverse operation
Remains at inner track.
Remains at outer track.
Is IC10 pin 12
approx. 3.3 V?
approx. 3.3 V?
Faulty traverse
detection switch S8
Is IC10 pin 12
approx. 0 V?
Faulty (shorted) traverse
detection switch S8
or
Is output of
IC3 pin 20 OK?
Is voltage
output between IC2
pins 15 and 16?
Faulty IC2
Faulty IC3
Faulty traverse motor
Printed in Japan
F990406500MT/KH(D)
