Sony DSR-1800 Service Manual page 181

Possible causes
4. Reel motor does not generate the
correct torque.
. Reel brake has mechanical defect.
. Reel brake solenoid is open.
. Reel brake solenoid drive IC is
defective.
. Reel motor is defective.
. Reel motor drive circuit is defective.
. Harness is defective.
5. Abnormality of reel FG
. S and T reel motor is defective.
. S and T reel FG amp is defective.
6. Tension regulator is defective.
7. Cut-and-spliced tape is used.
8. Top detector and end detector are
defective.
9. Pinch roller has insufficient pressure
against capstan.
. Pinch roller has mechanical defect.
. Pinch solenoid is open.
. Pinch solenoid drive IC is defective.
DSR-1800/P/1600/P
Check items and check procedure
. When the S and T reel brakes are considered
to be the cause of trouble :
Check the S and T reel brakes.
Check that the S and T reel brakes are released.
. When the S and T reel motors are
considered to be the cause of trouble :
Perform the servo adjustment.
Confirm that the servo adjustment is completed
as intended.
Perform the S and T reel adjustment.
Confirm that the reel FG adjustment is completed
as intended.
Check the magnet position in the tension adjust
menu.
Confirm that OK appears on display.
Check the tape top and tape end.
The top and end sensor must turn on and off
correctly.
Check the pinch roller.
Pinch roller must be pressed against the capstan
shaft correctly.
4-2. Error Codes
Related circuit boards and devices
When the reel brake is considered to
be the cause of trouble :
DR-428 board, reel brake solenoid
When the S and T reel motor or the
S and T reel FG is considered to be
the cause of trouble :
DR-428 board, S and Treel motor
SSP-24 board (DSR-1800/P)/
SSP-23 board (DSR-1600/P),
SE-538 board, DR-428 board
When the tape top sensor is
considered to be the cause of trouble :
SE-522 board, DR-428 board,
tape top sensor LED
When the tape end sensor is consid
ered to be the cause of trouble :
SE-521 board, DR-428 board,
tape end sensor LED
DR-428 board, pinch solenoid
4-15