Trouble Shooting - Marantz CD5004 Service Manual

TROUBLE SHOOTING

1. POWER PWB
Check FUSE Condition
[F901]OPEN?
・FUSE
Check ST+5V output
・Voltage Check
+5V DC (switched) Voltage is O.K.?
・[BN45] 5pin output
Check the poewr relay
・Is [RY91] switched?
Check +8V output
・Voltage Check
+8V DC (switched) Voltage is O.K.?
・[BN45] 7pin output
Check +12V output
・Voltage Check
+12V DC (switched) Voltage is O.K.?
・[BN44] 3pin output
Check VDD (+5V) output
・Voltage Check
+5V DC (switched) Voltage is O.K.?
・[BN45] 6pin output
Check -12V output
・Voltage Check
-12V DC (switched) Voltage is O.K.?
・[BN44] 1pin output
O.K.
O.K.
If the relay drive voltage is normal, relay is replaced.
O.K.
MAIN PWB
[IC21] (T5CD2) 78Pin
Check Parts and Soldering and Other Circuits.
O.K.
O.K.
O.K.
N.G.
Check the output short of trans ([T901][T902]).
If trans is short, trans is replaced.
(Open)
Check [Q902]corrector input voltage.
N.G.
Check Parts and Soldering and Other Circuits.
If abnormality is not found, [Q902] is replaced.
N.G.
Check the control signal for relay drive.
・[BN45] 11pin
1pin input
・[IC91]
N.G.
Check Parts and Soldering and Other Circuits.
If abnormality is not found, [IC91] is replaced.
・[IC94] 1pin input
N.G.
Check Parts and Soldering and Other Circuits.
If abnormality is not found, [IC94] is replaced.
・[IC92] 1pin input
N.G.
Check Parts and Soldering and Other Circuits.
If abnormality is not found, [IC92] is replaced.
1pin input
N.G. ・[IC93]
Check Parts and Soldering and Other Circuits.
If abnormality is not found, [IC93] is replaced.
27
TRANS_ON/OFF signal : 5V
O.K. N.G.