Service manual
3 Check the following items:
Check the termination printout.
4 Test termination
The test terminates after printing the termination printout.
Termination printout:
Normal termination 120
Abnormal termination Ex – – – – – 120
@@@@@
X = 01: Data check error
02: Address check error
Note: When an error occurs, the error print is performed and the
check is terminated. The error occurrence address is shown in
hexadecimal at positions shown with @@@@@ .
[13] Standard ROM test
1 Key operation
130 → TL
2 Functional description
Sum check of the standard ROM (C00000H - C3FFFFH) is per-
formed. If the lower two digits of SUM is 10H, it is normal.
3 Check the following items:
Check the printout after the test.
4 Test termination
The test automatically terminates with termination message.
Normal termination print 130
ROM 27020@@@@@
@@@@@
Error termination print E – – – – 130
ROM 27020@@@@@
@@@@@
Note: "@@@@@ " means the ROM version number.
The underlined section (10 bytes) of code table is provided in
the ROM as a standard and the table content is always
printed.
The table position is the upper 10 digits of the ROM address.
The check sum correction address is the last address -0FH.
Note: In the case of the ER-ROM, the ROM version number is dis-
played in the upper and the lower stages.
In the case of the MASK-ROM (future specification), the
MASK ROM code is displayed in the upper stage, and the
ROM version number is displayed in the lower stage.
130
ROM 27020RAU1A
RAU1A
400
[14] R/J printer dot pulse width adjustment
The dot pulse width adjust circuit is provided to control the width of
the current applied to the dot head of the printer, according to a
supply voltage fluctuation.
When the circuit is changed with a new one for such as a repair work,
the dot pulse width needs to be adjusted using the 200K pot VR1.
Fig. 3-3
Dot pulse adjusting method
1. Turn power on.
2. Measure the voltage of the VP line between the fuse F1 and GND.
Use a digital voltmeter capable of measuring 100mV steps.
3. Set the MODE switch to the SRV position and start the diagnostic
program Job #150 with the next command procedure.
150 → TL
4. Adjust pulse width of PE at the test point TP1 as shown in the
graph in Fig.3. The pulse width of PE can be adjusted using the
200K pot VR1.
5. To terminate the diagnostic program, press any key.
FIg. 3-4
Fig. 3-5
Fig. 3-6
S
ROM T
SS
R
V
DOT DISPLAY:
7-SEGMENT DISPLAY:
+5V+24V +24V
R12
130KF
D6
1SS
133
1
2
ZD3
E102
+5V
R15
3.3K
PE
TP
R14
62K
+24V
3
2
1
8
4
A
GL393
IC2
VR1
200K
R13
2K
ZD4
RD4.3EL1
Q4
C3198
TRG
R16
2K
R86
3.3K
C14
10000P
(2-7D)
(2-2D)
VR1
TP1
410
370
330
420
410
400
390
380
370
360
350
340
330
320
2221.6 23 24 25 26
26.4
Transmission width (µs)
Drive voltage (V)
±3µs
(Allowance)
Pd
Pw
Pt
TRG
PE
Pw
Pt
4µsec
1000µsec
Pd is adjusted to 373±3µsec. when Vp is +24.0V.
– 37 –