Adjustment Procedures; Disassembly Method - Panasonic NV-SJ420EG Service Manual

INDICATION
01 After cylinder lock is detected, the cylinder
does not start rotating again even after tape
unloading.
02 Cassette tape is not wound up during the tape
unloading except EJECT mode.
03 Mechanism locks during mode transition
except EJECT mode.
04 Mechanism locks during tape unloading.
06 Mechanism locks after tape unloading in
EJECT mode.
07 During recording mode, recording signal is
less than the normal condition.
08 Recording circuit works except recording
mode.
16 Cylinder lock detection.
17 Supply reel mechanism lock detection
18 Take-up reel mechanism lock detection
2* PG shifter automatic adjustment error.
Fig. T1 Self-Test indication Display
2.5. CAUTION FOR AC MAINS LEAD (NV-SJ420B)

3. ADJUSTMENT PROCEDURES

3.1. DISASSEMBLY METHOD

3.1.1. DISASSEMBLY FLOW CHART
This flow chart indicates disassembly steps of the cabinet parts and the circuit boards in order
to find the necessary items for servicing.
When reassembling, perform the steps in the reverse order.
CAUSE
Fig. D1
12
REMEDY/CHECK
Check the cylinder motor drive circuit.
Check the capstan motor drive circuit.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment.
3. Check the mode switch.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment for cassette
Protection of the over-current flowing
transistor which produces the power
for recording mode.
Check the recording circuit.
Check the cylinder unit and the cylinder
drive circuit.
Check the supply reel mechanism and
supply reel circuit.
Check the Take-up reel mechanism and
Take-up reel circuit.
Check the servo/system control circuit
cylinder unit.